Jackpot 2 LS EFI - TBI System

The Jackpot 2 LS EFI – TBI System is a standalone engine management system for 1997–2014 GM Gen III and Gen IV LS-based engines that use 58x/4x or 24x/1x crank and cam trigger patterns, built specifically for carb-style intake swaps using a 4-barrel throttle body. It’s perfect for LS swaps or for upgrading and replacing your factory ECU or existing aftermarket EFI, giving you modern sequential fuel and spark control, wideband closed-loop learning (single sensor included), and the flexibility to support everything from stock street builds to boosted and nitrous-capable combinations when tuned correctly.

Jackpot 2 LS EFI – TBI System

Modern EFI control for carb-style LS swaps.

Jackpot 2 LS TBI is designed for builders who want the simplicity and look of a 4-barrel throttle body setup, but with real standalone LS control behind it. Whether you’re swapping a 5.3 into a classic truck, cleaning up a street car build, or building a weekend warrior that needs consistent drivability and repeatable tuning, this system keeps the install straightforward while giving you the control that matters. The throttle body features four 100 lb/hr EV6 injectors and supports GM LS engines up to 650 HP. It’s controlled by a remote-mounted Jackpot ECU that manages fuel and LS coils, and it can be configured with built-in GM transmission control (select versions), eliminating extra boxes, complex wiring, and add-on TPS sensors.

Gen 2 Platform Advantages

Jackpot 2 LS TBI is built on Aces’ OEM-standard 32-bit ECU architecture, designed to manage input and output signals, voltage stability, and RPM response faster and more consistently than many common aftermarket alternatives. The remote-mounted ECU design also helps protect the electronics from heat and vibration, improving long-term reliability and serviceability compared to throttle-body-integrated ECU designs. Jackpot 2 also adds a more refined guided setup and learning experience, so you can get running quickly on common combinations, then step into deeper manual control whenever your build demands it.

What It Is

Jackpot 2 LS TBI is a complete LS engine management package centered around a remote-mounted ECU and a 4-bbl throttle body injection unit. The ECU controls the critical pieces of an LS swap in one system:

• Fuel control through the included TBI throttle body and injectors
• Ignition control for LS coil-per-plug (no external timing box required for basic spark management)
• Optional ECU-based GM automatic transmission control on supported applications (select versions)

It’s designed to get you running quickly using a startup wizard and base calibrations for common LS combinations, then refine drivability using wideband closed-loop learning. Self-learning is strongest on stock-to-mild builds. For aggressive cams, power adders, and anything that needs tighter control, Aces’ free laptop tuning software provides full manual tuning access.

What It Fits

Jackpot 2 LS TBI is designed for GM Gen III and Gen IV LS-based engines using the following trigger patterns:

• 24x/1x crank and cam trigger pattern
• 58x/4x crank and cam trigger pattern

The same kit works for both early 24x engines and 58x engines without needing additional harnesses, so you can buy confidently without getting trapped in a “wrong harness” situation.

Important Fitment Exclusions

This system is intended for LS swap-style standalone control and is not designed to manage active VVT or AFM/DOD strategies as part of its ECU control approach. If your engine uses those functions, plan your build accordingly (common delete/lockout paths apply in many swap scenarios).

Choose Your System Version

Jackpot 2 LS TBI is offered in configurations based on whether you want ECU-based GM automatic transmission control.

Throttle Type

Drive-by-cable (carb-style throttle linkage).
The Jackpot 2 LS TBI throttle body is designed with a 4150-style flange. If your manifold uses a different flange pattern, you can use an adapter to make it work.

Transmission Control

Manual Transmission Version: For manual swaps or builds using a separate transmission controller.
Transmission Control Version: For builds where you want the ECU to control a compatible GM automatic transmission.

For automatic setups, the transmission control feature (available in select systems) currently supports:

• 4L60E (1996–2003)
• 4L65E (1996–2003)
• 4L67E (1996–2003)
• 4L80E (1994–2003)

What’s Included With Every Standalone System

Every Jackpot 2 LS TBI standalone system includes the core parts needed to run the engine and complete initial setup, with the exact contents depending on the version selected (manual vs transmission control).

Each standalone system includes:

• Jackpot 2 ECU (remote-mounted)
• 4-bbl LS TBI throttle body assembly with four 100 lb/hr EV6 injectors (supports up to 650 HP)
• Jackpot 2 LS TBI full system harness
• USB-CAN cable
• Coolant temperature sensor (CTS)
• Single wideband O2 sensor
• Power Distribution Module (PDM)
• Handheld touchscreen interface or bluetooth module
• Transmission sub-harness (included on transmission control versions)

Harness details (important):

• The harness always includes both 24x and 58x sub-harnesses, so you are covered for either trigger pattern supported by this system

What You Need for Most LS Swaps

Fuel System Requirements

Your fuel system must be designed to support a proper EFI regulator strategy and stable pressure under load, sized to match your horsepower goal. This matters even more on swaps where tank design, pickup location, plumbing size, and return strategy vary wildly. If you plan to run ethanol blends, build the fuel system accordingly and plan on tuning for the fuel. Note: The system does not support flex fuel sensing.

Exhaust Weld-in Bung Installation (for O2 sensor)

Wideband learning depends on proper sensor placement. You’ll need a correctly installed bung and a leak-free exhaust near the sensor to ensure accurate readings and stable learning behavior. Poor placement and exhaust leaks are some of the fastest ways to create chasing-your-tail drivability issues.

Electrical and Grounding

As with any standalone ECU, clean power and solid grounds are essential. Many sensor and drivability issues come down to grounding quality, voltage drop, or electrical noise. The system includes a PDM (Power Distribution Module) to help keep your power distribution clean and consistent, and to support swap-friendly outputs like fuel pump control and fan outputs, depending on your configuration. The PDM uses IGBT transistor control in place of traditional relay styles, which helps filter transient voltage spikes and better protect electronics connected to the system.

If You’re Running Boost or Nitrous

Jackpot 2 LS TBI is boost compatible and includes nitrous timing control features when configured correctly with the right sensors and tuning strategy. Each TBI unit includes a built-in 3-bar MAP sensor that supports up to 27 psi of boost capability when the fuel system and calibration are built to match the combination. For boost control itself, use a standalone boost controller as needed based on your setup and goals.

What It Supports (Aftermarket and Stock Compatibility)

Jackpot 2 LS TBI is designed to work with common OEM and aftermarket LS swap components as long as the combination fits the supported trigger patterns and does not require active VVT or AFM/DOD control. It is built for real-world swaps where chassis wiring, accessory routing, and sensor layouts vary, and it’s designed to keep requirements clear so you can plan the build without surprises.

Key Features at a Glance

• 32-bit Power Architecture-based processor for faster response
• Compatible with both 24x and 58x engines, with no additional harnesses to buy
• Single Bosch LSU 4.9 wideband O2 sensor
• Self-learning adaptive idle, fuel, and ignition controls
• Boost compatible
• Nitrous timing control
• Sequential fuel and spark control with individual cylinder trim
• Programmable RPM limiters and launch controls
• Multi-fuel capable (tuning-based, no flex-fuel sensing)
• Map switching
• Optional ECU-based transmission control on supported GM 4-speed automatics (select systems)

Engineered Hardware and Electrical Protection

Jackpot 2 LS TBI is built around a remote-mounted ECU architecture for durability and serviceability. Keeping the ECU away from throttle body heat and engine vibration helps improve long-term reliability. The system is designed with stable power handling and OEM-style electrical protection so the ECU and connected components remain consistent across changing voltage and load conditions that are common in swaps.

Fuel and Spark Control

Jackpot 2 LS TBI delivers modern ECU strategy on a carb-style intake setup. It supports sequential spark control for LS coil-per-plug and advanced fueling strategies through the included 4-injector throttle body, while using wideband feedback to refine drivability in closed loop once the engine is at operating temperature. It also includes the control features that matter for real builds, including map switching, ignition trim control, rev limiting, and launch control functionality.

Ignition Compatibility

This system is designed to control LS coils directly, so you get real ECU-driven spark control instead of relying on external ignition boxes for basic timing management. That’s a major advantage over generic “carb-style EFI” approaches on LS swaps because it keeps fueling and ignition strategy unified inside one ECU.

Injector Compatibility

The throttle body comes configured with four integrated 100 lb/hr EV6 injectors. Injector selection is not a decision point on this system like it is on multiport setups, because the injector package is built into the TBI unit and designed around the system’s intended power range (up to 650 HP, fuel system and calibration dependent).

Cooling Fan Control and Outputs

The system is designed for swap-friendly integration and supports common ECU-driven outputs used in LS swaps. Depending on how you configure the install, this can include typical control outputs for items like fuel pump and fans, helping keep the wiring clean and centralized.

Dash and Gauge Integration

Jackpot 2 LS TBI is designed to support common swap gauge strategies and Aces integration accessories, with handheld monitoring and optional app connectivity depending on configuration.

Fuel Level Input (Gen 2)

Gen 2 adds a dedicated fuel level input so you can bring your tank sender signal into the ECU and view fuel level directly on the handheld display or through the Aces Connect App when using the Bluetooth module. This is especially helpful on swaps where the factory ECU is removed, and the original cluster fuel signal is no longer being driven the same way.

Setup is handled through the handheld/app settings: connect the sender signal, select the appropriate configuration method, then calibrate and verify the reading (including optional smoothing/filtering if needed for stable real-world display). Once configured, you can monitor fuel level alongside key ECU data like RPM, speed, voltage, and sensor readings.

For factory gauges, most tachometers can be driven by the Jackpot 2 using a square-wave tach output. For broader gauge coverage, the included Aces handheld (or an optional Bluetooth module) can display tach, speed, battery voltage, fuel level, and other key sensor data. All Aces EFI systems are also compatible with Dakota Digital gauges using the Dakota Digital EFI BIM module.

Installation Expectations

Most installs can be completed in a little over a weekend when the fuel system plan is solid, wideband bungs are installed properly, and wiring is routed cleanly. More complex builds, such as transmission control setups, custom dash integrations, or high-power boosted combinations, will require additional time and setup.

A simple first-start checklist always helps: verify fuel supply and pressure stability, verify grounds and clean power, confirm trigger pattern selection, confirm ignition configuration, start and warm up, then allow closed-loop learning to begin.

Setup and Tuning Experience

Jackpot 2 LS is built to be approachable for first-time EFI builders without limiting experienced tuners.

Guided Setup (Handheld or Bluetooth)

After the install, initial setup is straightforward. Using the included handheld touchscreen (or the Bluetooth module if that’s the option you choose), you’ll run through the setup wizard and answer a few basic questions about your engine and configuration—things like cam type, ignition/timing setup, and other core inputs the ECU needs to start safely and learn correctly.

The wizard process is the same whether your build is stock or aggressive. Where the difference comes in is how far you rely on self-learning. Self-learning is intended for stock to mild combinations and is excellent for daily driving, cruising, and normal load transitions. Wide-open throttle pulls, dyno tuning, and higher-risk operation (especially with aggressive combinations or power adders) should be handled with manual tuning using the free laptop software.

The handheld or Bluetooth module is needed for initial setup, adjustments, and monitoring, but it does not need to remain plugged in once the system is configured and running correctly. Think of it as your setup and control interface: use it to configure, make changes, and view live sensor data whenever you want.

For stock and mild applications, the guided setup wizard and self-learning fueling strategy help deliver quick startup and strong drivability with minimal tuning complexity. Once the engine reaches operating temperature and transitions into closed loop, the system begins learning fueling in real time. After a few drive cycles, fueling accuracy and response continue to improve, and when you are satisfied with the results, you can lock the calibration.

For performance builds, the included USB cable and Aces’ free laptop tuning software give you full manual control, so you can confidently dial in aggressive cam profiles, power adders, and race-focused combinations with complete authority.

Takeaway

The Jackpot 2 LS EFI – TBI System gives you the carb-style LS look with real standalone control. You get a 4-barrel throttle body built around four 100 lb/hr injectors, a remote-mounted 32-bit ECU that controls fuel and LS coils, wideband closed-loop learning (single sensor included) for strong drivability on stock-to-mild builds, power-adder compatibility when tuned correctly, and optional built-in GM transmission control for a cleaner, simpler swap without stacking extra boxes.