The Joker

Sequential EFI system for classic engines with built-in CDI

The Joker Sequential EFI/CDI Master Kits (800 HP)

$2,439.99

Product Info

Overview

Joker EFI/CDI - The Most Powerful Multi-Port EFI System

Take your high-performance or boosted V8 to the next level with ACES EFI’s Joker EFI/CDI—the most powerful Multi-Port EFI system on the market! The Joker is the only EFI system that integrates a Digital Capacitive Discharge Ignition (DCDI) system inside the ECU, delivering unmatched spark energy, precision, and control. Whether you're running high compression, forced induction, or aggressive racing setups, the Joker’s high-voltage CDI system ensures maximum power and efficiency.

What Makes Joker EFI/CDI Unique?

Unlike traditional EFI systems that rely on weaker inductive ignition, Joker’s CDI system produces a hotter, more consistent spark that burns fuel more efficiently, leading to:

Superior combustion in high-boost or high-compression applications
Increased power and throttle response
Reduced misfires and improved fuel efficiency

Total Control for Performance Builds

Just like our Wild Card system, the Joker EFI/CDI works with most classic 8-cylinder engines, offering a customizable firing order in the start wizard and requiring a 7+1 timing setup for accurate ignition control. But what sets Joker apart is its built-in CDI technology and racing-grade features:

Integrated Digital CDI – Produces 150mJ spark energy output for maximum ignition performance
Massive Voltage Output – Primary voltage: 450-530V / Secondary voltage: 50,000V
2-Stage Rev Limiter – Set a max RPM limit for engine protection, plus launch control for optimal starts
Burnout Mode – Holds RPM at a set limit for consistent, controlled burnouts

Three Configurations to Match Your Build

Standalone System – Includes ECU, wiring harness, handheld controller, and basic sensors
Top-End Kit – Adds an aluminum intake manifold (black or raw finish), Gambler Series distributor, ignition coil, injectors, throttle body, and fuel rails
Master Kit – Includes everything from the Top-End Kit plus a fuel delivery system of your choice

MP-EFI vs. TBI: Why Multi-Port is Superior

Throttle Body Injection (TBI) is outdated. It sprays fuel above the throttle blades, leading to uneven fuel distribution and weaker throttle response. In contrast, Joker’s true sequential MP-EFI meters fuel cylinder-by-cylinder, optimizing:

Fuel economy
Power output
Drivability

Built for All Power Levels – Stock to Race-Ready

Power Levels: Available in 500 HP and 800 HP configurations
Self-Learning: Stock to mild builds benefit from automatic tuning, while high-performance setups require custom tuning
Injector Options: Choose between EV1 or EV6 style injector harnesses (coming soon!)
Dual Wideband O2 Sensors: Ensures proper fueling across both banks for ultimate performance.

From street builds to high-boost race cars, Joker EFI/CDI is the ultimate all-in-one ignition and fuel control solution. No need for a separate CDI box—Aces EFI is the only company to offer EFI and CDI in one ECU. If you’re serious about performance, The Joker is the system you need!

Features:

Integrated digital CDI with 150mj spark energy output
2-stage Rev limiter setting for max RPM, launch control, and burn out
32-bit software (OEM standard) that manages input/output signals, voltage, and RPM faster and more consistently than competitors
Primary voltage 450-530 Volts, secondary Voltage 50000 Volts
5” full-color touchscreen handheld with built-in GPS speedometer
Integrated coil driver for ignition timing control (when using Aces’ coil and distributor)
Simple calibration wizard for initial setup- no laptop tuning required.
Self-learning fuel table
Dual fan control
Step retard for nitrous control
Boost compatibility (using laptop software)
Free laptop software available for pro applications
Compatible with Aces’ handhelds, dashes, CAN modules, and TCMs.
Bosch 4.9 WBO2 sensor

EFI System Specs

The Joker Sequential EFI/CDI Master Kits (800 HP) Specifications

Specification	Value
Accelerometer Support	No
Boost Control	No
Boost Compatible	Yes
CAN-BUS Support	Yes
Coil Per Cylinder Ignition Support	No
Datalogging Support	Yes
Distributor Included	Not in the Standalone system unless that option is selected.
Dry Nitrous Control	No
Dry Nitrous Compatibility	No
e85 Support	Yes
EFI Type	Multi Port
EGT Support	Yes
Emission Code	3
Forced Induction Support	Yes
Fuel Filter Included	Only in EFI Fuel Kits & Master Kits
Fuel Hose Included	Only in EFI Fuel Kits & Master Kits
Fuel Injectors Included	Only in Top End & Master Kits
Fuel Pressure Regulator Included	Only in select EFI Fuel Kits & Master Kits
Fuel Pump Included	Only in EFI Fuel Kits & Master Kits
Grade Type	Performance
Handheld Included	Yes
Idle Air Control Motor Included	Only in Top End & Master Kits
Ignition Timing Control	Yes
Ignition Type	7+1 Hall Effect Distributor
Individual Cylinder Fuel Corrections	Yes
Injector Connector	EV6
Intake Manifold Included	Only in Top End & Master Kits
Knock Retard Support	No
MAP Sensor	2.8 Bar or 3 Bar Depending on Kit
MAP Sensor Included	Only in Top End & Master Kits
Mounting Hardware Included	Yes
Multi-Stage Nitrous Control	No
Progressive Nitrous Control	No
Sequential Injection	Yes
Self-Learning	Yes
Throttle Position Sensor Included	No
Transmission Control	Not built in
User-Tuneable	Yes
Wet Nitrous Control	Yes but non-progressive
UPC
Part Number(s)	AS2015-1

Injector Specs

Injectors	Rated Flow per Injector (lb/hr)	Rated Injector Pressure (psi)	Minimum Injector Opening Time (msec)	8.0V	8.8V	9.6V	10.4V	11.2V	12.0V	12.8V	13.6V	14.4V	15.2V	16.0V	16.8V	17.6V	18.4V	19.2V	20.0V
36 lb/hr (500 hp kits)	36	43.5	1.544	2.157	1.648	1.323	1.03	0.857	0.741	0.646	0.542	0.478	0.418	0.345	0.302	0.256	0.224	0.19	0.156
65 lb/hr (800 hp kits)	65	43.5	1.555	2.081	1.761	1.417	1.161	0.992	0.833	0.763	0.677	0.597	0.511	0.462	0.407	0.342	0.359	0.328	0.291

Resource Documents

The_Joker_Installation_and_Tuning_Manual_03_2026.docx.pdf

For additional manuals, diagrams, measurements, and more, check out our documents page in our Resource Center by clicking here.

What's in the box?

Items shown below reflect what normally comes in the box for each kit and may vary during certain promotions schedules.

The Joker ECU (x1)

Your choice of manifold (x1) (All options not shown)

Your choice of throttle body (x1)

Your choice of distributor (x1)

Your choice of a fuel system (x1)

Your choice of a handheld or bluetooth device (x1)

Coolant Temp Sensor (x1)

4.9 WBO2 Sensor (x2)

The Joker Main Harness (x1)

The Joker Sub-harnesses (x1)

Additional Accessories Pack (x1)

USB CAN Cable (for laptop software) (x1)

Ignition Coil (x1)

Joker EFI/CDI - The Most Powerful Multi-Port EFI System

What Makes Joker EFI/CDI Unique?

Unlike traditional EFI systems that rely on weaker inductive ignition, Joker’s CDI system produces a hotter, more consistent spark that burns fuel more efficiently, leading to:

Superior combustion in high-boost or high-compression applications
Increased power and throttle response
Reduced misfires and improved fuel efficiency

Total Control for Performance Builds

Integrated Digital CDI – Produces 150mJ spark energy output for maximum ignition performance
Massive Voltage Output – Primary voltage: 450-530V / Secondary voltage: 50,000V
2-Stage Rev Limiter – Set a max RPM limit for engine protection, plus launch control for optimal starts
Burnout Mode – Holds RPM at a set limit for consistent, controlled burnouts

Three Configurations to Match Your Build

Standalone System – Includes ECU, wiring harness, handheld controller, and basic sensors
Top-End Kit – Adds an aluminum intake manifold (black or raw finish), Gambler Series distributor, ignition coil, injectors, throttle body, and fuel rails
Master Kit – Includes everything from the Top-End Kit plus a fuel delivery system of your choice

MP-EFI vs. TBI: Why Multi-Port is Superior

Fuel economy
Power output
Drivability

Built for All Power Levels – Stock to Race-Ready

Power Levels: Available in 500 HP and 800 HP configurations
Self-Learning: Stock to mild builds benefit from automatic tuning, while high-performance setups require custom tuning
Injector Options: Choose between EV1 or EV6 style injector harnesses (coming soon!)
Dual Wideband O2 Sensors: Ensures proper fueling across both banks for ultimate performance.

Features:

Integrated digital CDI with 150mj spark energy output
2-stage Rev limiter setting for max RPM, launch control, and burn out
32-bit software (OEM standard) that manages input/output signals, voltage, and RPM faster and more consistently than competitors
Primary voltage 450-530 Volts, secondary Voltage 50000 Volts
5” full-color touchscreen handheld with built-in GPS speedometer
Integrated coil driver for ignition timing control (when using Aces’ coil and distributor)
Simple calibration wizard for initial setup- no laptop tuning required.
Self-learning fuel table
Dual fan control
Step retard for nitrous control
Boost compatibility (using laptop software)
Free laptop software available for pro applications
Compatible with Aces’ handhelds, dashes, CAN modules, and TCMs.
Bosch 4.9 WBO2 sensor

The Joker Sequential EFI/CDI Master Kits (800 HP) Specifications

Specification	Value
Accelerometer Support	No
Boost Control	No
Boost Compatible	Yes
CAN-BUS Support	Yes
Coil Per Cylinder Ignition Support	No
Datalogging Support	Yes
Distributor Included	Not in the Standalone system unless that option is selected.
Dry Nitrous Control	No
Dry Nitrous Compatibility	No
e85 Support	Yes
EFI Type	Multi Port
EGT Support	Yes
Emission Code	3
Forced Induction Support	Yes
Fuel Filter Included	Only in EFI Fuel Kits & Master Kits
Fuel Hose Included	Only in EFI Fuel Kits & Master Kits
Fuel Injectors Included	Only in Top End & Master Kits
Fuel Pressure Regulator Included	Only in select EFI Fuel Kits & Master Kits
Fuel Pump Included	Only in EFI Fuel Kits & Master Kits
Grade Type	Performance
Handheld Included	Yes
Idle Air Control Motor Included	Only in Top End & Master Kits
Ignition Timing Control	Yes
Ignition Type	7+1 Hall Effect Distributor
Individual Cylinder Fuel Corrections	Yes
Injector Connector	EV6
Intake Manifold Included	Only in Top End & Master Kits
Knock Retard Support	No
MAP Sensor	2.8 Bar or 3 Bar Depending on Kit
MAP Sensor Included	Only in Top End & Master Kits
Mounting Hardware Included	Yes
Multi-Stage Nitrous Control	No
Progressive Nitrous Control	No
Sequential Injection	Yes
Self-Learning	Yes
Throttle Position Sensor Included	No
Transmission Control	Not built in
User-Tuneable	Yes
Wet Nitrous Control	Yes but non-progressive
UPC
Part Number(s)	AS2015-1

Injectors	Rated Flow per Injector (lb/hr)	Rated Injector Pressure (psi)	Minimum Injector Opening Time (msec)	8.0V	8.8V	9.6V	10.4V	11.2V	12.0V	12.8V	13.6V	14.4V	15.2V	16.0V	16.8V	17.6V	18.4V	19.2V	20.0V
36 lb/hr (500 hp kits)	36	43.5	1.544	2.157	1.648	1.323	1.03	0.857	0.741	0.646	0.542	0.478	0.418	0.345	0.302	0.256	0.224	0.19	0.156
65 lb/hr (800 hp kits)	65	43.5	1.555	2.081	1.761	1.417	1.161	0.992	0.833	0.763	0.677	0.597	0.511	0.462	0.407	0.342	0.359	0.328	0.291

Computing Power

A robust ECU that utilizes our OEM standard 32-bit architecture. This allows the system to manage input/output signals, voltage, and RPM faster and more consistently than our competitors.

Plug 'n' Play

Not a tuning wiz? You don't need to be since we provide a wizard for you. Our self-learning* functionality means you only have to answer a few basic questions in the startup wizard, and then the ECU takes care of the rest. After about 30-60 minutes of idling and drive time, the system will build its own tune so you don't have to.

*Self-learning works best for stock-mild applications. For more aggressive applications and even some stock-mild applications, we offer free tuning software on our website.

It Takes Two

The Wild Card EFI system utilizes two WBO2 sensors to read each bank of your V8 engine. Dual wide-band sensors allow precise calibration of each cylinder bank, optimizing performance and allowing more thorough tuning of your engine without any compromises.

Videos

Joker installation guide

Master Kit Feature

(Fuel) Pump Up the Jam

Each Master Kit will come with a fuel system of your choosing. You can scroll down to read more about the available options below.

Aces Fuel Injection, Inc. 255 In-line Fuel Pump System with PTFE Hose 255 In-line Fuel Pump System with PTFE Hose

255 In-line Fuel System

A frame-mounted in-line pump with all of the necessary fittings and hose.

Command Center 2

A surge tank system that allows you to keep your mechanical pump in place. A better option for classic trucks or other vehicles where the tank is hard to access.

Tight-fit In Tank Pump Module

An in-tank fuel pump module available with or without PTFE hose.

Requires a return line to the tank.

Aces Fuel Injection Pump Module & 20' PTFE Hose Kit + Pressure Sensor Kit Tank Conversion Pump Module w/Internal Regulator (340 LPH)

Tank Conversion Fuel Pump Module

An in-tank fuel pump module with an internal regulator. Ideal for fuel cells.

Does not require a return line to the tank.

How do I set up and program my system?

Interface Options

Our EFI systems are self-learning for most stock-to-mild engine builds. You’ll use one of the included interface modules (depending on the option selected at purchase) to complete the initial setup and make adjustments on the fly. The startup wizard will prompt you with 6–12 setup questions, after which the self-learn feature takes over.

Additional fine-tuning may be required later, depending on your specific build.

5" Handheld (3rd Gen)

Capacitive touch screen
64-bit processor
1280x720 resolution
Cable connection via main harness

8" Handheld (1st Gen)

Capacitive touch screen
64-bit processor
1280x800 resolution
Wifi chip for software updates via the internet*
Cable connection via main harness

Most common questions

Quick answers to our most common queries for this product.

Will it work with aftermarket components?

The The Joker Sequential EFI/CDI Master Kits (800 HP) are designed to work with most stock or aftermarket ignition components. They will work with most tachometers and are compatible with Dakota Digital dashes using their Aces BIM Module (BIM-EFI-1).

Is it self-tuning?

Self-tuning is a common term used among aftermarket EFI companies, but we prefer the term "self-learning" as that is more accurate, even for our competitors who advertise "self-tuning."

Our systems are designed to self-learn the fuel MAPs and work best for stock-mild builds. Some mild builds and anything beyond that would require manual tuning, of which the system is fully capable. Additional features like nitrous and boost are also considered beyond stock and require manual adjustments to enable and configure these kinds of features.

Can it be custom-tuned?

Yes! You can make many changes using the Bluetooth or handheld interface, and we also offer a free PC app for more advanced tuning.

Is it boost & E85 compatible?

Yes to both! The The Joker Sequential EFI/CDI Master Kits (800 HP) are compatible with both blow-through, draw-through, and nitrous applications and are also compatible with E85 Fuels. The The Joker Sequential EFI/CDI Master Kits (800 HP)' MAP sensor can be scaled for up to 26 lbs of boost and can be set to retard timing.

Note that for boost, the system is compatible, but cannot control the boost. You will need to use a separate controller for things such as wastegate control or solenoid activation. Use of these features will require manual tuning.

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We love hearing from you! Hint: chat gets priority support. 🔥

Chat with us by clicking the message icon in the bottom left corner or contact us through another option below:
(423) 590-ACES (2237)
customerservice@acesefi.com

Our customer support is available Monday to Friday: 9:00 AM - 5:00 PM EST

Do you ship internationally?

You bet! Just keep in mind that for international orders, we do not currently collect duties and taxes at checkout. You would need to pay these fees before our shipping partner delivers it to you, and they would reach out to you before delivery with a secure payment link.

Don't want to worry about duties and import taxes? Reach out to us to see if we have a reseller in your area, and we can help hand over the transaction to them for an even faster purchase!

How long will it take to get my order?

It depends on where you are on the sphere, but here is how it generally works.

Orders are fulfilled first-come, first-served, usually within 1-2 business days, except during the peak holiday season, where they can definitely take longer due to order volume. (Orders placed after 4:00 PM EST are typically fulfilled the following business day.)

Once your order is packed up and on its way, our shipping partners take over. How quickly it arrives depends on the delivery option you chose at checkout.

Note: You can always pick up your order at our Chattanooga location, but make sure you call us at least 1 hour in advance so we can make sure it's ready for you in time :)

My question isn't listed :(

We got you! Give us a call or shoot us a message, and we will be glad to answer any questions you might have!

Our customer support is available Monday to Friday: 9:00 AM - 5:00 PM EST

The Joker

Sequential EFI system for classic engines with built-in CDI

The Joker Sequential EFI/CDI Master Kits (800 HP)

Kit Types Explained

Joker EFI/CDI - The Most Powerful Multi-Port EFI System

What Makes Joker EFI/CDI Unique?

Total Control for Performance Builds

Three Configurations to Match Your Build

MP-EFI vs. TBI: Why Multi-Port is Superior

Built for All Power Levels – Stock to Race-Ready

Joker EFI/CDI - The Most Powerful Multi-Port EFI System

What Makes Joker EFI/CDI Unique?

Total Control for Performance Builds

Three Configurations to Match Your Build

MP-EFI vs. TBI: Why Multi-Port is Superior

Built for All Power Levels – Stock to Race-Ready

The Joker Sequential EFI/CDI Master Kits (800 HP) Specifications

Joker EFI/CDI - The Most Powerful Multi-Port EFI System

What Makes Joker EFI/CDI Unique?

Total Control for Performance Builds

Three Configurations to Match Your Build

MP-EFI vs. TBI: Why Multi-Port is Superior

Built for All Power Levels – Stock to Race-Ready

The Joker Sequential EFI/CDI Master Kits (800 HP) Specifications

Videos

(Fuel) Pump Up the Jam

Interface Options

Most common questions

Customer Reviews

Reviews in Other Languages

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WE GOT YOUR BACK. 🫶