Wild Card 2 MPFI Fuel Injection Installation Guide V1.2

About Us

At Aces, we believe performance should be within reach for every car enthusiast. Born from a passion for hot rod technology, we push the boundaries of EFI innovation, empowering DIY builders and professionals alike. We do it "For the People" because we believe that achieving your dreams should never be exclusive.

Our commitment is simple: deliver exceptional products that inspire, at fair prices that make high-performance accessible. Whether it's your first EFI setup or your latest build, we're here to fuel your journey with precision, reliability, and cutting-edge technology.

We don't just build EFI systems, we craft experiences that ignite passion, break barriers, and bring the joy of customization to everyone. Performance should never be out of reach, and with Aces, it never is. Our goal is to give our customers the absolute best value for their money both in the short and long run, so that they can look back and be proud that they bet on Aces.

Backed by over 10 years of experience, a history of winning results, and an unwavering dedication to research and development, Aces is built for performance, designed for dreamers, and made for those who refuse to settle.

 

Built for performance. Designed for dreamers. Made for you.

1.0 Introduction

The purpose of this manual is to guide you through the installation and basic setup of your Wild Card 2 EFI System. It covers installation through initial start-up and includes essential troubleshooting steps to help you achieve a smooth, stable idle before moving on to driving.

This manual does not cover advanced setup, advanced drivability adjustments, or performance tuning. For further guides, diagrams, videos, and expanded troubleshooting resources, please visit our resource center at acesefi.com, where you can also connect with our support team during business hours.

This EFI system is designed to be easy to use for first-time users. This manual does not cover EFI theory in detail, but instead provides the steps needed to get the engine up and running quickly. The EFI system also allows the user to make more advanced tuning changes if desired.

Important Note

Depending on the type of kit you purchase, it may or may not include fuel systems or other components such as the fuel pump, fuel filters, fuel pressure regulator, fuel lines, manifolds and/or ignition components. Aces Fuel Injection offers complete kits, which can be purchased separately.

2.0 Warnings, Notes, & Notices

⚠️ WARNING: Before disconnecting the battery, identify a clean, switched 12-volt ignition source. This source must provide 12 volts during cranking and when the key is in the run position. Always disconnect the battery before performing any work on the vehicle.

NOTE: Some installation and adjustment procedures may require an assistant. Ensure an additional person is present for safety reasons.

2.1 Critical Warnings

⚠️ WARNING: Failure to follow these instructions may result in an improper installation, which could cause serious injury, death, or property damage. Improper installation or misuse of this Aces product will void all warranties.

⚠️ WARNING: Installation, adjustment, and repair should only be performed by a trained mechanic with adequate experience in fuel and automotive electrical systems.

⚠️ WARNING: Aces EFI systems consist of multiple sophisticated components. Failure of a single component does not justify a warranty claim for the entire system. Individual components are available for warranty replacement.

⚠️ WARNING:To preserve the warranty, these installation instructions must be read and followed thoroughly. Failure to follow instructions can void the warranty and may result in serious injury or property damage.

⚠️ WARNING:The oxygen sensors in this kit are designed for use with unleaded fuel ONLY. Using leaded fuel will degrade the oxygen sensor, leading to incorrect oxygen readings and improper fuel delivery.

⚠️ WARNING:RTV silicone sealers can damage oxygen sensors. Ensure that any RTV silicone sealant used is compatible with oxygen sensor-equipped vehicles. This information should be clearly indicated on the RTV package.

⚠️ WARNING:Fuel vapors are heavier than air and can accumulate in low areas, where they may be ignited by sparks or flames, resulting in property damage, injury, or death. Always prevent fuel spills to eliminate this risk.

⚠️ WARNING: Work must be performed in a well-ventilated area. Do not smoke or have open flames nearby, as gasoline vapors are highly flammable and can cause explosions.

⚠️ WARNING: Aces EFI systems offer extensive adjustability, and proper setup and calibration are essential for safe operation. If you are not comfortable with engine fundamentals and EFI tuning, we recommend having the system installed and calibrated by an Aces authorized installer or qualified tuning shop. Our technical support team is also available at acesefi.com or +1 (423) 590-2237 to help answer basic installation, setup, and troubleshooting questions.

2.2 Calibration Responsibility Notice

All supplied Aces Fuel Injection calibrations, wizards, and tuning information are provided as starting points only. It is the responsibility of the end user to confirm that the calibration is safe for the intended use.

Aces Fuel Injection, Inc. holds no responsibility for engine damage resulting from the misuse or improper tuning of this product.

3.0 Part List

This list applies to standalone systems only and does not include items or exchanges done during promotional periods or offers.

Item	Description	QTY	Service Part
1	Wild Card 2 ECU	1	AS2013
2	Handheld	1	AS2009
3	Wire harness	1	AH2013
4	Wide band O2 sensor	2	AE1060
5	Clamp-on Oxygen Sensor Bung	2	AE1061
6	Coolant Temperature Sensor	1	AE1052
7	Gambler Series Distributor	1	AD2023
8	Fuel Injectors - 36 lb./hr.	8	AE1001
9	Four-Barrel Throttle Body	1	AM1004
10	SBC Intake Manifold w/ Fuel Rail Kit	1	AM2050 (AM2050B for Black Manifold)

4.0 Wild Card 2 MPFI System Installation

4.1 Engine Requirements

Before proceeding with the installation, confirm that your vehicle meets the following engine and fuel system requirements:

● The engine is in good mechanical condition.

● The engine runs on unleaded fuel only.

● Any RTV silicone sealants used on the engine are confirmed to be sensor safe.

4.2 EFI System Compatibility & Limitations

This EFI system is intended only for the applications listed in this manual. While it may be possible to make it work with other applications, and Aces may occasionally highlight such builds on social media or elsewhere in the spirit of ingenuity, doing so can void your warranty. Aces may be unable to provide customer support for systems used outside their intended applications, and performance cannot be guaranteed. The user assumes all risks when operating the system in unsupported applications. For complete warranty details, please review our warranty policy at acesefi.com .

4.3 Electrical System Requirements

● A clean 12V source direct to the battery.

● A clean 12V switched ignition source.

● A direct connection to the negative terminal of the battery for all ground circuits.

NOTE: Do not connect to the starter, alternator, or any other "dirty" voltage sources, as they can damage electrical components.

4.4Fuel Delivery System Requirements

Fuel pressure directly affects how much fuel is delivered to the engine when the injectors are opened. Higher fuel pressure delivers more fuel during an injector opening event. Lower fuel pressure delivers less. It is critical that the fuel pressure matches the injector pulse widths required by the calibration for your specific application.

A complete high-pressure EFI fuel system must be installed for the Wild Card 2 System. The pump should be capable of supplying 255 liters per hour or 400 pounds per hour of fuel. The system requires a minimum of 43.5 PSI fuel pressure. Fuel pressure must be regulated between 43.5 PSI and 58 PSI. The system will not self-regulate fuel pressure and must be regulated by your fuel delivery system.

Required fuel system components:

● A 100 micron pre-filter (installed before the pump)

● A 10 micron post filter (installed after the pump)

● An EFI fuel pressure regulator (installed after the fuel rail)

4.5Return Line Requirements

Your fuel delivery system may require a fuel return line to the tank. This depends on the location of the regulator and whether it is in-tank or external.

● If the regulator is external, a return line is required.

● Surge tank-style fuel pump modules also require return flow.

⚠️ WARNING: Some late-model vehicles originally equipped with a throttle body injection system may have a usable return line. However, the return line must not create a pressure restriction. Return line pressure should remain below 3 to 5 PSI and must be at least ⅜" in diameter. A restricted or undersized line can cause tuning issues.

⚠️⚠️ DANGER: Do not use vapor canister lines as fuel return lines. This can lead to fuel leaks, fire, or explosion, and may result in serious injury or death.

⚠️⚠️ DANGER: Proper installation of a return line may require complete removal of the fuel tank. This should be performed only by a qualified technician. Improper handling can cause an explosion or serious injury.

4.6Minimum Tools Required For Installation

The following list is not comprehensive.

● Standard socket and wrench set

● Standard screwdriver set

● Standard allen wrench set

● Wire strippers

● Rags or shop towels

● Drill and assorted bit sizes

● Welder and PPE if welding the O2 sensor bung (not required when using a clamp-on method)

● Electrical connectors

● Up to a 2" hole saw (depending on ECU mounting location)

● Factory Service Manual for your vehicle and or engine

● Digital voltmeter

● Terminal crimping tool

An assistant is required for certain installation and adjustment procedures. For safety reasons, do not attempt to complete the installation alone.

5.0 Pre-Installation Steps

5.1 Removal of Existing Components

1. Disconnect the battery.

2. If applicable, remove the existing OEM system components according to your vehicle's Factory Service Manual.

⚠️ WARNING:Before disconnecting the battery, identify a clean, switched 12-volt ignition source. This source must provide 12 volts during cranking and when the key is in the run position.

5.2 General Checklist

☐  Conduct an inventory check to ensure you have all the necessary components and tools before beginning the installation process

☐  Ensure all mating surfaces are properly cleaned and sealed

☐  Ensure chassis and engine grounds are cleaned

☐  Make sure your battery is fully charged to a minimum of 12 volts and in good condition

☐  Ensure the vehicle has an adequate fuel level

☐  Ensure adequate hood clearance is available for manifold installation (if applicable)

☐  Ensure accessory drive compatibility with your intake manifold (if applicable)

☐  Ensure your exhaust system is free of leaks

5.3 Checking Hood Clearance

Prior to removing your old manifold, it is necessary to measure clearance between the air cleaner and the hood. One method of doing so involves constructing several columns of modelling clay and placing them on top of the air cleaner in various positions. Close the hood completely and then reopen it. Measure the clay columns to record your hood clearance.

Compare the height of your old intake manifold with your new intake manifold. Be sure to consider the height of both the carburetor and air cleaner.

5.4 Removing the Old Manifold

● Disconnect the ground cable from the battery followed by the positive cable. The battery should be completely disconnected prior to the start of installation.

● Clean any loose debris, dirt, and grease from the top of the engine adjacent to the intake manifold and valve covers. This will help prevent harmful debris from falling into the engine during the installation process.

● Identify the vacuum and crankcase ventilation hoses (if any) leading to air cleaner and note the routing and connection points. Remove the air cleaner.

● Prior to removing any other vacuum lines, identify the routing of the lines. Mark and remove the vacuum lines from the carburetor and/or intake manifold.

⚠️ WARNING: Hot coolant and steam may be present if the engine is still warm.

● Drain the radiator. (It may be necessary to remove the bottom radiator hose if there is no drain plug).

● Disconnect the throttle linkage, transmission kick-down linkage (auto trans only), and choke rod from the carburetor, (if applicable).

● Loosen the gas cap to relieve pressure from the fuel system. Disconnect the fuel line at the carburetor. Plug the end of the fuel line to prevent fuel leakage.

● Remove the carburetor.

● Tag and disconnect the ignition coil and sensor wires. Remove the ignition coil bracket and the coil.

● Remove the radiator hose, thermostat housing, and the thermostat.

● Remove all water and vacuum fittings from the manifold.

● Remove all remaining brackets (if any) from the manifold.

● Loosen and remove the valve covers to assist in the manifold removal and the new manifold installation.

5.5 Removing the Old Distributor

⚠️ WARNING: FOLLOW THESE INSTRUCTIONS CAREFULLY, AS SERIOUS DAMAGE CAN OCCUR WHEN THE IGNITION IS NOT RE-INSTALLED CORRECTLY.

● Set the engine to 12° Before Top Dead Center (BTDC) on the compression stroke of cylinder #1. Removing the spark plug from cylinder #1 may be required to confirm the compression stroke.

● Remove the distributor cap. Note the position of the rotor by marking the distributor body in line with the rotor tip (it should point to the position of the cylinder #1 spark plug wire on the distributor cap).

● Note the position of the distributor vacuum canister (or other distributor body feature) by marking a convenient surface not attached to the intake manifold.

● Observe the gap of the breaker points if they are open; if closed, measure the distance from the point block to the cam lobe. For distributors equipped with a magnetic pickup, record the alignment of the trigger wheel relative to the pickup. These measurements will be critical if the engine is inadvertently rotated during installation.

● Remove the distributor. DO NOT rotate the engine after removing the distributor. If the engine is inadvertently rotated, use the crankshaft timing marker as reference to re-align it.

● Remove the 12 intake manifold bolts.

● Remove the intake manifold. If the intake manifold is stuck to the mounting flanges, do not pry against cylinder head port flanges, as they could become damaged and compromise the gasket sealing with your new intake manifold. Double check that all the bolts have been removed and pry upward carefully at the engine block end seal surfaces.

6.0 O2 Sensor Placement and Setup

Harness connectors: WBO2_1 and WBO2_2

Kit items required for this step:

● Wideband O2 Sensor (2)

● Weld-in O2 Sensor Bung (2)

6.1 Select the sensor location

● Install one wideband oxygen sensor in each exhaust bank where it can read the combined exhaust flow from that bank. In most header applications, the preferred location is just downstream of the point where the primary tubes merge into the collector.

● For long-tube headers, place the sensor approximately 6 to 10 inches (150 to 250 mm) after the collector. Position the sensor as close to the engine as practical while keeping it upstream of any catalytic converter so the ECU receives an accurate and timely AFR signal.

● Maintain enough exhaust pipe length after the sensor location to support a stable reading. A minimum of 18 inches (450 mm) of pipe downstream of the sensor is required, and 24 inches is preferred where space allows.

● If the exhaust system uses an H-pipe or X-pipe, install each sensor ahead of the crossover so each channel reads only its own bank.

● If the vehicle is equipped with an AIR or smog-pump system, the sensor must be installed where it reads untreated exhaust gas before any injected air enters the exhaust stream.

 

6.2 Sensor angle and clearance

● Mount the sensor in the upper half of the exhaust tube with the sensor body angled more than 10 degrees above horizontal. This helps reduce condensation exposure at the sensing element.

● Before welding the bung in place, verify that the connector and wiring will clear nearby components. Do not place the sensor where the harness may contact hot exhaust parts, moving components, or sharp edges.

● Route the sensor wiring away from primary tubes, collectors, and ignition wiring. Add heat protection where needed, and avoid running the wideband wiring in long parallel paths next to ignition leads or other high-interference circuits. If crossing is necessary, wires should intersect at an angle rather than running alongside each other.

6.3 Prepare and install the bung

● Mark the selected mounting point and create the opening required for the supplied bung.

● Fit the bung so the inside of the exhaust path remains as smooth as possible, with no lip protruding into the pipe.

● Remove burrs as needed, then weld the bung completely around its perimeter to create a leak-free seal.

● Allow the welded area to cool completely before installing the sensor.

⚠️Welding precaution

Before performing any welding on the vehicle, disconnect power from the EFI system and unplug related electronic components and harness connections that could be affected. When practical, remove sensitive control electronics from the vehicle before welding begins.

6.4 Install O2 Sensor

● If the sensor threads are not already pre-coated, apply a very small amount of nickel-based anti-seize to the threads only, following the sensor manufacturer's instructions. Do not allow anti-seize to contact the sensing tip.

● Thread the sensor into the bung and tighten it to approximately 22 to 33 ft-lb (30 to 45 N·m).

⚠️ WARNING: Never run the engine with a wideband sensor installed unless the sensor is connected to the ECU and being actively powered and heater-controlled. A wideband sensor must operate at an elevated temperature to function correctly. Running the engine with the sensor installed but unpowered can allow moisture and contaminants to collect inside the sensor, which may cause thermal shock, contamination, loss of accuracy, or permanent sensor failure.

6.5 O2 Sensor Wiring

Install one sensor in the driver-side bank and connect it to the matching harness connector. Install the second sensor in the passenger-side bank and connect it to the remaining wideband connector. Always confirm the correct connector by the printed harness label before powering the system.

⚠️Warning

● Leaded fuel will shorten the wideband oxygen sensor life and is not recommended.

● Use only oxygen-sensor-safe sealants in nearby exhaust work. Some silicone-based products can release compounds that may damage the sensor.

● Eliminate any exhaust leaks upstream of the sensor location before attempting to verify AFR or tune the system, since leaks ahead of the sensor can distort the reading.

● For turbocharged applications, place the sensor 12 to 24 inches downstream of the turbine outlet. Do not install the sensor ahead of the turbocharger.

7.0 Installation

7.1 Install the Aces Intake Manifold

● Clean the cylinder head port flange and the engine block end seal surfaces. To prevent gasket pieces from falling into ports and the lifter valley when cleaning old gaskets from head surfaces, stuff paper towels into all the ports and lay rags in the lifter valley.

● When clean, carefully remove the paper towels from the cylinder head ports and then the rags from the lifter valley. Make sure that all particles and/or debris are completely removed.

● Wipe surfaces with rags soaked in solvent, such as brake cleaner or lacquer thinner to remove any oils or grease. This is a necessary step for proper manifold/gasket sealing.

● Apply a thin coat of gasket adhesive to the cylinder head side of the intake gasket surfaces and the cylinder head port flanges. Allow the adhesive to completely dry. Lay the manifold gaskets in place, making sure that gaskets are adhered to the cylinder head port flange and will not slip from their properly installed positions.

Aces Intake Manifold for Small Block Chevy show for example. Other intakes available at Acesefi.com.

● Before applying RTV silicone sealant, trial fit the new intake manifold. Position the manifold and verify that it seats correctly on the intake manifold gaskets. A gap should exist between the engine block and the manifold at the end seal surfaces.

● Ensure all intake manifold bolts can be installed. Confirm clearance from the hood and proper installation of any components dependent on the manifold before proceeding.

● When you are fully prepared to install the intake manifold, apply a ¼" wide bead of oil-resistant RTV-silicone sealant to the front and rear block-sealing surfaces, making sure to overlap manifold gaskets at all four corners. Do not use the cork or rubber end seal gaskets included in the gasket set.

● Apply a light film of RTV-silicone around the water passage openings.

● Carefully position the intake manifold. If the manifold shifts, the RTV-silicone must be cleaned and reapplied.

● Apply thread sealer to the threads of bolts that pass completely through the casting. For bolts that install into blind holes, apply a drop of motor oil to the threads.

● Install the intake bolts.

● Apply a silicone lubricant to each fuel injector O-ring and insert injectors into the ports of the manifold. Orient injectors to avoid interference of the injector wiring harness with the throttle cable.

● Apply thread locking compound to the screws. Use these screws to attach the fuel rail brackets to the manifold. Orient the brackets for attaching the fuel rail.

● Assemble the fuel rails to the injectors. Check to see that the fuel rail brackets are oriented correctly for attachment of the fuel rails, then attach fuel rails to brackets.

● Attach each fuel rail to the intake manifold with thread locking compound. If using the shorter fuel rail brackets, the bottom hole on the manifold will be used. If using the taller fuel rail brackets, the upper hole of the manifold will be used.

● Install the thermostat, gasket, and thermostat housing. Be sure that the thermostat housing is in good condition and has been cleaned of any old gasket material. If the mounting flange on the thermostat housing is not flat or is damaged, replace it before continuing.

● Install the heater hose fitting, heater hose, and radiator hoses. Use thread sealer on the threads of the heater hose fitting.

● Install the engine coolant temperature (ECT) sensors and vacuum fittings into the manifold. Use thread sealer on the pipe threads of the sensors and fittings. Install the included pipe plugs in any unused water and vacuum ports in the manifold.

7.2 Install Aces The Gambler Series Distributor

● Verify the engine is still positioned at 12 degrees before top dead center with cylinder #1 on a compression stroke.

● Install the gasket onto the distributor housing and apply lubricant liberally to the distributor gear.

● Install the Aces Gambler Series Distributor so that the rotor is pointed toward the #1 stamped on the outside of the distributor housing and the short trigger tooth is just entering the distributor sensor.

NOTE: You may need to remove and reinsert the distributor a few times to get the alignment correct. Make sure that the distributor seats down completely and has full engagement with the oil pump drive. You may need to rotate the oil pump shaft to ensure it is engaged properly.

DISTRIBUTOR ROTOR LOCATION AT INSTALLATION POINTING TO #1 ON SIDE OF HOUSING WITH ENGINE AT 12° BTDC CYLINDER #1 ON COMPRESSION STROKE.

● Tighten the hold down clamp leaving it just loose enough that you can rotate the distributor during the timing procedure, but not loose enough that the distributor will rotate on its own. The final timing will be set using Aces handheld.

● Install the spark plug wires. Attach the spark plug wire from cylinder 1 to the distributor cap post labelled "1" on the distributor housing, and so on.

7.3 Install Aces Throttle Body Etc.

● Install throttle body studs in the manifold. Place the throttle body gasket on the clean carburetor pad. Do not use sealant of any type on the throttle body gasket.

4 Barrel Throttle Body

● Install the throttle body and throttle cable bracket.

● Connect all linkage and throttle springs.

● Rotate throttle lever to wide-open throttle position and check for smooth operation. Also be sure the throttle opens completely without the throttle blades rotating over center. If the throttle blades rotate over center, a hung throttle condition could occur.

● Connect all vacuum and fuel lines. Refer to vacuum line tags or engine diagrams for correct placement.

● Automatic transmissions only:Attach transmission kick-down bracket if needed. Adjust kick-down or throttle pressure linkage for proper shift points (refer to your vehicle's shop manual for the proper adjustment procedure). Check all linkages, making sure that they function freely.

● Reinstall valve covers and new gaskets.

● Install the A/C and coil brackets, coil, wires, and all brackets that were previously removed from the manifold.

● Close the drain and fill the radiator to the proper level with coolant. While filling, allow trapped air to bleed from the intake manifold at the heater hose fitting until coolant flows from the fitting. Then, re-install the heater hose and continue adding coolant to the proper level.

IMPORTANT!When the installation of the intake manifold is complete, change the oil to remove any coolant or debris that may have contaminated the crank case.

7.4 ECU Installation

The ECU may be mounted inside the passenger compartment or in the engine compartment. If mounting in the engine compartment, follow these guidelines:

● Mount the ECU where water or road debris will not strike it directly. Do not mount where the ECU can be pressure-washed or submerged.

● Keep the ECU away from major heat sources. Do not place it near exhaust manifolds or headers.

● Keep the ECU as far as reasonably possible from sources of electrical noise, such as spark plug wires, capacitive discharge ignition boxes, and similar devices.

● Orient the ECU with the connector end pointing down so water cannot enter the terminals. If the harness route prevents this, include a drip loop in the wiring below the connector.

● Do not overtighten the mounting hardware, especially if the ECU is not on a perfectly flat surface.

● Use vibration isolation when possible. Your kit includes four rubber feet. Install the ECU with these rubber feet or equivalent isolation pads.

● Mount to a rigid metal surface using four M5 screws and flat washers.

● Route the wiring harness away from sharp edges and moving parts. Use grommets where the harness passes through bulkheads.

ECU Wiring Requirements

EFI performance depends on clean power, reliable grounds, and careful harness routing. Connect the ECU's main battery feed and ground directly to the battery, and confirm that the battery, engine, and chassis have a strong shared ground path.

● Keep EFI wiring away from ignition components, plug wires, coils, ignition boxes, and other interference-producing circuits. Do not run sensor wiring alongside high-voltage or high-current wiring for long distances.

● Make all electrical connections with the correct tools and approved connection methods. Protect finished connections with heat shrink or equivalent sealing materials, and do not use shortcut splice connectors that are prone to failure.

● ECU outputs should be used only within their intended load limits. Devices such as cooling fans should be controlled through the proper relay or interface arrangement unless the output is specifically designed to carry that load directly.

● Do not share sensor signal wires between multiple controllers unless the circuit was intentionally designed for that purpose. Use a stable keyed 12V source for switched power, and avoid ignition-side or accessory circuits that may introduce voltage noise into the EFI system.

8.0 Harness Installation and Sensor Connection

The following indicates the primary sensors that are required to be connected.

Wild Card 2 Wire Harness

8.1 Coolant Temperature Sensor (CTS)

● Install the Coolant Temperature Sensor (Item 3) into a 3/8"NPT coolant passage in either the intake manifold or cylinder head. Do not overtighten, or damage to the cylinder head or intake may occur.

● If the intake manifold is not being changed, drain half of the coolant before the sensor is installed.

● Use thread sealer or a small amount of thread tape.

● Do not install the sensor in the thermostat housing, or in other areas without a constant flow of coolant.

● Connect the CTS connector to the sensor.

Coolant Temperature Sensor

8.2 Throttle Position Sensor (TPS)

Connect to the cable driven throttle body.

TPS Sensor

8.3 Idle Air Control (IAC)

Connect to the cable driven throttle body.

IAC Motor

8.4 Wide Band Oxygen Sensor (WBO1 and WBO2)

Connect to the oxygen sensors previously installed. The Wild Card 2 systems are intended to be used with Bosch LSU 4.9 wideband oxygen sensors (supplied).

Wild Card 2 kits have two sensors, one for each bank. One sensor should be installed in the exhaust pipe of the driver side, another one should be installed in the exhaust pipe of the passenger side. Plug wire connector labeled WBO2 1into the oxygen sensor on the driver side, plug wire connector labeled WBO2 2into the oxygen sensor on the passenger side.

 

Dual Wide Band O2 sensor

8.5 MAP and IAT

Previous iterations of the Wild Card System used a single TMAP sensor. The Wild Card 2 splits these inputs into MAP and IAT inputs. Connect both to the throttle body.

8.6 The Aces Gambler Series Distributor

The distributor has a 3-pin connector-12 volts , ground and Hall signal.

The Gambler Series Distributor

8.7 Ignition Coils (COIL)

Connect coil connector to ignition coil AC2008.

Ignition Coil Connector

8.8 Fuel injectors

The Wild Card 2 is compatible with high-impedance injectors only. For direct drive operation, injector coil resistance must be greater than 8 ohms.

The Wild Card 2 harness has EV6 connectors. The injection style of the Wild Card 2 is sequential. Ensure that every injector is connected to its corresponding injector connector, otherwise engine damage may result.

The Wild Card 2 ECU features dual lambda controllers and two corresponding wideband O2 sensors, which are necessary for the closed-loop lambda control on a V8 engine's two banks. To ensure the Wild Card 2 ECU's dual-lambda closed-loop function operates correctly, connect the injector connectors to the appropriate injectors. Then, connect the WBO1 connector to the driver-side wideband O2 sensor and the WBO2 connector to the passenger-side wideband O2 sensor.

Aces Fuel Injector AE1001 36 lb/hr

8.9 Handheld (CAN)

The handheld controller should be installed in an easily accessible location in the passenger compartment. The handheld plugs directly into the main harness at either connector labeled "CAN." This connector is located approximately 11.8 inches from the ECU connector. The handheld is not strictly required to remain in the vehicle after the vehicle is set up and running properly.

CAN connector

8.10 Loose Wires

The following loose wires in the main wiring harness should be connected as follows on all systems.

"IGNSW" (Red)

Connect to a clean key-on and cranking 12V power source. This source must provide power when the ignition is on and must also remain powered while cranking. Verify this with a voltmeter, as not all ignition circuits provide power during cranking. This wire is located approximately 20 inches from the ECU connectors.

NOTE:Do not connect this wire to a dirty source such as an ignition coil.

"Main_Power +" (Red)

Must be connected directly to the wire on the relay pack labeled "Main 12V Out." This circuit powers the fuel pump and fuel injectors. When connected to the relay, this wire is protected by a fuse in a sealed fuse holder near the relay.

"Ground" (Black)

Must be connected directly to the negative battery terminal. Using a chassis ground can cause electrical problems. This wire is located approximately 20 inches from the ECU connector.

8.11 Additional Outputs

The following additional wire outputs in the main wiring harness should be connected as follows on all systems. These wires come out of the harness about 23" from the ECU connectors except Point Out.

"Main_Power +" (Red)

Must be connected directly to the wire on the relay pack labeled "Main 12V Out." This circuit powers the fuel pump and fuel injectors. When connected to the relay, this wire is protected by a fuse in a sealed fuse holder near the relay.

"Ground" (Black)

Must be connected directly to the negative battery terminal. Using a chassis ground can cause electrical problems. This wire is located approximately 20 inches from the ECU connector.

"Fuel_Pump" (Brown)

Connect to the wire on the relay pack labeled "Fuel Pump".

"Main_Relay" (Orange)

Connect to the wire on the relay pack labeled "Main Relay".

"Tach Out" (Gray)

Provides a 12V square-wave signal used to trigger a conventional tachometer.

"Pump" (Orange)

This wire supplies power for the fuel pump and is located on the relay. Do not use this wire to power pumps that draw more than 15 amps. Refer to the fuel pump manufacturer for current requirements. For high-current pumps, use this wire to trigger a separate relay, and run a larger gauge wire (10 gauge recommended) to power the pump. The fuel pump also requires a ground wire. Run a ground from the negative pump terminal to a solid chassis or frame ground.

 

VMain (Red)This output will provide a 12V power supply from the main relay. This wire is located approximately 32" from the ECU connectors.

Nitrous_In (Blue)Nitrous oxide activation wire. Feeding 12V power to this wire tells the ECU that a nitrous oxide system has been activated.

9.0 Ignition Wiring/Timing Control

The WIld Card 2 can control timing using the Aces Gambler Distributor.

The Wild Card 2 ECU features a built-in ignition coil driver utilizing a high-performance IGBT chip. Aces recommends using the Black Jack Pro Series Ignition Coil (PN AC2008) , which delivers 90mJ of spark energy with a 3ms dwell time without requiring a CDI box. This setup enhances cold starts, idle stability, and fuel economy.

If the harness and ECU are configured for timing control, connect the coil connector to the AC2008 ignition coil. If not, proceed as outlined later, in section 7.7.

NOTE:Canister-style coils are not recommended as some will not work with timing control.

10.0 Sensor Verification

IMPORTANT: If any of these sensors do not read properly, DO NOT attempt to start the engine.

Before starting the vehicle, verify that all sensors are reading correctly.

● Turn the key off, then cycle it back on.

● Listen for the fuel pump, which should activate and run for approximately 5 seconds.

● Inspect for any fuel leaks before proceeding.

10.1 Sensor Readings on the Home Screen (Key ON, Engine OFF):

● Engine RPM: Should display "0" (RPM will be detected once the engine is cranking or running).

● MAP (Manifold Air Pressure Sensor): Should read between 95-102 kPa or 13-14 PSI. At higher elevations, it may read as low as 75 kPa or 10-11.

● TPS (Throttle Position Sensor)

○ Slowly press the throttle to wide open; it should read 85-90 at wide-open throttle (WOT).

○ Cable-operated throttle bodies should read 0 when closed.

● CTS (Coolant Temperature Sensor): Displays engine temperature. If the engine is cold, it should be close to ambient temperature.

● Battery Voltage: Should read 12.0V minimum.

12.0 Startup Engine

At this stage, you are ready to start the engine. Before attempting to start your vehicle with the newly installed Wild Card 2 EFI system, Aces recommends following this checklist to ensure a safe and successful startup.

12.1 Pre-Startup Checklist:

☐  Double-check all wiring connections, especially:

☐  Power and ground are directly connected to the battery.

☐  The small Red "IGNSW" wire from the Wild Card ECU has power during both Key-On and Cranking.

☐  Ensure that the Wildcard ECU, fuel pump, fuel lines, and wiring are securely mounted away from heat sources and pinch points.

☐  Wideband Oxygen Sensors are installed in the proper location.

☐  Check for exhaust leaks.

☐  Throttle linkage is fully connected and operational from the pedal.

☐  Handheld controller powers on when the key is turned to the ON position.

☐  The Startup Wizard has been completed on the handheld controller.

☐  Fuel pump primes when the key is in the ON position.

☐  No fuel leaks are present when the system is under pressure.

12.2 Starting the Engine

When ready, turn the key to the ON position and observe the Handheld Dash to confirm that the Killshot ECU is receiving an RPM signal.

● Crank the engine and check the RPM parameter on the handheld display.

● If the ECU is functioning correctly, the RPM value should register, and the engine should fire, run, and settle into idle.

● A cold engine may initially idle at a higher RPM (approximately 1200-1500 RPM), depending on engine temperature.

12.3 Startup Troubleshooting

● If the RPM signal is missing, there is likely an error in wiring or system setup.

● For assistance, contact Aces Fuel Injection support at (423) 590-ACES(2237) or acesefi.com.

13.0 After Startup

Once the vehicle has started, inspect for any fuel or coolant leaks. Allow the vehicle to warm up while checking the following parameters to ensure proper operation:

Key System Parameters to Monitor:

● Fuel Loop State:

○ Indicates whether the engine is running in Closed Loop or Open Loop mode.

○ Closed Loop means the ECU is adjusting fuel delivery to maintain the target air/fuel ratio (AFR).

○ The Wild Card 2 EFI system is designed to operate in Closed Loop most of the time.

● Inj Percent (Injector Compensation Percentage):

○ Shows the percentage of fuel adjustment the ECU is making.

○ Below 100% → ECU is removing fuel.

○ Above 100% → ECU is adding fuel.

○ In Open Loop mode, this value will always remain at 100%.

● Inj PW (Injector Pulse Width):

○ Displays the injector pulse width (how long the injectors remain open).

○ Varies depending on engine speed and load.

● Target Air/Fuel Ratio (AFR):

○ The desired AFR that the ECU is programmed to maintain.

○ This will change based on engine speed and load.

● Actual AFR (Air/Fuel Ratio):

○ The real-time AFR reading from the wideband oxygen sensor.

○ The Closed Loop Compensation should be constantly adjusting fuel delivery to keep the Actual AFR close to the Target AFR.

● Fuel Learn State (Self-Learning Status):

○ Indicates the status of the Wild Card 2 "Self-Learning" function.

○ The system will automatically adjust fuel delivery as you drive.

○ Conditions for Self-Learning to Activate:

■ Engine temperature must exceed 160°F.

■ The system must be running in Closed Loop mode.

■ Self-learning must be enabled (this is enabled by default in the base Killshot setup).

○ Once the engine reaches 160°F, self-learning should become active.

14.0 Handheld Navigation & Use

The Aces 5" HD Handheld Programmer is a device for ECU tuning and monitoring. Communication with the ECU is achieved via CAN bus, with a Type-C USB interface available for programming. The unit allows for real-time adjustments and calibration of parameters such as idle speed, Air-Fuel Ratio (AFR) targets, and fuel pump settings. Navigation is managed through the touchscreen and physical buttons. The device also integrates a GPS speedometer function.

14.1 Making Adjustments

Slider Bar: Adjust parameters by either sliding the bar or clicking the "+" and "-" buttons.

● Click "  " (Save) to confirm the adjustment.

● Click "  " (Cancel) to discard changes.

Numeric Keyboard:Tap the edit box (e.g., "100%") located above the slider bar to open the numeric keyboard for manual input.

2D Graph: Adjust parameters by dragging the red dot on the graph or using the mechanical buttons on either side.

● While making adjustments, the y-axis coordinate value of the currently selected parameter is displayed in the upper right corner of the screen.

● The four side buttons will disappear after a short display period.

Additional Adjustments:

● Click the two mechanical buttons in the lower-left corner to switch the position of the green dot.

● Click the right-center button to raise the green dot.

● Click the lower-right button to lower the yellow dot.

● The y-axis coordinate value of the green dot is displayed in the upper right corner of the screen.

Once the configuration is complete:

● Click "  " (Save) to confirm the adjustment.

● Click "  " (Cancel) to discard changes.

14.2 Handheld Connection

The handheld controller connects to the ECU via the CAN bus. Firmware and program updates can be performed using the Type-C USB interface.

 

14.3 Main Menu

1. Monitor:Displays a variety of gauge and dashboard layouts for real-time data monitoring.

2. Tuning:Allows easy adjustment of various engine parameters.

3. Logging:Enables users to select specific data points for logging, allowing better observation of ECU performance.

4. Files: Used for saving and loading tuning calibrations. Also provides system information about the ECU and handheld controller.

5. Settings:Adjusts the backlight brightness, button/touchscreen volume, and displays handheld device information.

6. Wizards: Assists with creating a base calibration and performing the TPS Zero Learn function.

15.0 Calibration Wizard

16.0 Timing Verification

Have a timing light handy as the first step will be positioning the distributor.

1. Turn the ignition key ON to supply power to the Wild Card 2 system. Navigate the handheld to Tuning >> Spark >> Basic >> Static Timing. This menu allows precise positioning of the distributor, which is necessary for the Wild Card 2 ECU to control timing.

2. Start the engine. Set the static timing to 12 degrees Before Top Dead Center (BTDC) . Then, navigate the handheld to Tuning >> Spark >> Advanced >> Lock Ignition Timing . Select Lock by pressing the Enter button, then save. The ignition timing is now fixed at 12 degrees BTDC. Using the timing light, rotate the distributor until the timing mark on the balancer indicates 12 degrees BTDC. Secure the distributor hold-down clamp.

3. Set Lock Ignition Timing back to "unlock," and set the static timing to 12 degrees BTDC. Return to the Home screen; the Wild Card 2 ECU is now controlling the ignition timing. It is important to note that when viewing with a timing light, the actual timing at idle speed may not appear accurate due to ECU calculations. The correct timing will be displayed when the engine speed is raised above idle.

4. Navigate to the Spark screen: Tuning >> Spark >> Basic. Here, you can adjust the Idle, Cruise, Wide Open Throttle (WOT), and Cranking timing settings. It is HIGHLYsuggested that a dedicated timing map be created using the Wild Card 2 EFI PC Software for the specific engine the Wild Card 2 EFI is controlling. The timing map generated using the handheld is basic, and engine performance will be optimized significantly with a timing curve tailored to the specific engine combination.

16.1 Timing Offset

Use this value to retard or advance the timing or sync timing at higher RPMs. These values are set to 0 in the base calibrations. Some ignition modules may need this number altered if the commanded timing misaligns as engine speed increases. If the timing starts to retard as RPM increases, this number can be increased in order for the timing to match.

17.0 Idle Setting

Once the engine is warmed up, the idle can be set to the desired speed.

● Select the Tuning tab. Find the target hot idle speed. Move the button left and right to adjust it. Click the button to save the new value or select CANCEL at the bottom to move out of this screen.

● Regardless of whether you change the idle speed, The throttle plates on the throttle body must be set to an optimum position. To do so, select the Monitor tab while the engine is running. You will see the Idle screen. Look at the "IAC Position" value. This value should be set between 6 and 20 with the engine in neutral and up to operating temperature. Also make sure the "TPS" value is showing a value of 0. If it is not, you need to perform a TPS Zero Learn.

● If the "IAC Position" value is showing zero, you must close the throttle plates until it reads a value of 6-20. Slowly turn the throttle shaft adjustment screw on the throttle body counterclockwise. If the IAC position is "stuck" at 0, it is likely that the engine is idling at a higher speed than you have set the target idle speed for. You need to adjust the throttle plates to resolve this issue.

● If the "IAC Position" value is greater than 20, it is a good idea to open (turn the throttle shaft adjustment screw in, clockwise) the throttle plates until the "IAC Position" value is between 6 and 20. Note that if you open the throttle plates such that the "TPS" position goes above a value of 0, you will need to shut the vehicle off and perform a TPS Zero Learn.

● Restart the vehicle and continue adjusting the throttle plates. Once the TPS goes above a value of 0, the ECU goes out of its "idle" mode and will lock the IAC Position to a fixed value.

● When the adjustments are completed, ensure the TPS reads a value of 0 with the engine idling.

18.0 Self-Learning

At this point, it is time to drive the vehicle and let the system perform its Self-Learning process. The best way for this is to drive the vehicle under as many different operating conditions as possible, such as different engine speeds and loads. Start by slowly revving the engine up in neutral and holding it at different speeds up to 2500 RPM. This will help the system learn these points. Then drive the vehicle, possibly using different transmission gears to learn in different areas. If you have an automatic transmission you may want to put it in gear, and with your foot on the brake pedal, apply a SMALL amount of throttle so that the system learns in this area as well.

There are several conditions where Self-Learning will NOT occur:

● If the engine is below 160° F.

● When the engine sees quick accelerator pedal movement.

● When the accelerator pedal is lifted, and the vehicle is coasting.

● If learning is disabled by the user.

If you are interested in seeing if Self-Learning is completed in a certain area, you can look at the following:

● Select Monitor from the Main Menu then select Monitors.

● Select the Fuel Inj FW icon.

● The Fuel Learn States page indicates if the learn feature is active.

At this point your Wild Card 2 is ready to be driven and enjoyed.

19.0 Diagnostic LEDs