FiTech Ultimate LS 500HP EFI System with Short LS3 L92 Intake & Transmission Control

Transform your LS-based project with the ultimate bolt-on electronic fuel injection upgrade. The FiTech Ultimate LS 500HP EFI Kit (70012) is a comprehensive, self-tuning induction system engineered for both DIY hot rodders and professional EFI tuners. Whether you are dropping a junkyard pull-out into a dedicated drift car, prepping a custom engine build for the drag strip, or completing a classic restoration, this kit provides everything you need to ditch outdated factory hardware, mismatched parts, and complex wiring harnesses.

Complete Self-Learning EFI for LS3/L92 Engines

Designed specifically for rectangular port LS3 and L92 heads, this setup is rated to support up to a robust 500 horsepower at the flywheel. The kit centres around a fabricated 3mm thick TIG-welded aluminium sheet metal intake manifold, finished in a sleek black anodised coating. Providing excellent bonnet clearance for tighter engine bays, it is paired with a precision-cast 92mm throttle body for optimal airflow and crisp throttle response.

Built-in Electronic Transmission Control

Take total control of your drivetrain. This kit includes integrated electronic transmission management tailored for GM electronically controlled automatic gearboxes. The Ultimate LS ECU allows you to effortlessly dial in shift points, shift firmness, and downshift mapping. It is fully compatible with GM 4L60, 4L65, 4L80, and 4L85 transmissions. If you are running a manual or non-electronic gearbox, simply leave the sub-harness disconnected—it is entirely versatile.

Precision Fuel Delivery and Control

Fuel delivery is handled seamlessly by high-flow 36 lb/hr matched injectors and billet aluminium fuel rails, ensuring your engine runs flawlessly. The system is also compatible with boost and nitrous power adders, offering wide flexibility for high-performance applications.

Key Features & Specifications:

• Engine Compatibility: Fits LS3 and L92 blocks with Rectangular Port heads.

• Throttle Body: High-flowing 92mm cast aluminium cable-operated throttle body.

• Intake Manifold: 3mm thick fabricated aluminium, TIG-welded, with a stealthy black anodised finish.

• ECU & Tuning: Self-learning ECU featuring sequential fuel and spark control. Includes a full-colour touch screen controller with a windscreen mount for easy on-the-fly tuning.

• Sensors Included: Wideband O2 sensor (with clamp/weld-on bung), MAP, TPS, IAC, and IAT sensors.

• Harness: Custom plug-and-play primary wiring harness.

• Extra Outputs: Programmable electric cooling fan controls, speedometer output, and fuel pump relay output.

• Manufacturer’s Warranty: 3 years, with full technical support when purchased from JP Racing as an approved distributor.

• Part Number: 70012

• Installation: Click to Download

Fuel Pressure Regulators

This unit will require an uprated Fuel Pressure Regulator to meet the fuel requirements of your newly uprated Ultimate LS Intake EFI system. Fitech offer the following:

• Fitech Go Fuel “Tight Fit”, No Gauge: #54000 – supports up to 1000HP and adjustable between 30 – 70 PSI. Includes 2x -6 ORB ports plus 1x vacuum/boost port.

• Fitech Go Fuel “Tight Fit”, Includes Gauge: #54001 – supports up to 1000HP and adjustable between 30 – 70 PSI. Includes 2x -6 ORB ports plus 1x vacuum/boost port.

• Fitech Go Fuel “High Horsepower”, Includes Gauge: #54002 – supports up to 2000HP and adjustable between 30 – 70 PSI. Includes 4x -6 ORB ports plus 1x vacuum/boost port.

Take the headache out of your LS swap and maximise your horsepower with the FiTech 70012 Ultimate LS EFI Kit. With its self-learning technology and complete hardware package, getting your engine roaring to life has never been simpler.

(Note: This system is designed for retrofit into older vehicles that do not require emissions controls. It is not approved for use on pollution-controlled vehicles).