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FiTech 70050 Ultimate LS Standalone EFI ECU w/o Trans Control
FiTech 70050 Ultimate LS Standalone EFI ECU w/o Trans Control

FiTech 70050 Ultimate LS Standalone EFI ECU w/o Trans Control

Chevy LS V8

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FiTech 70050 Ultimate LS Standalone EFI ECU w/o Trans Control
FiTech 70050 Ultimate LS Standalone EFI ECU w/o Trans Control
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Part # 52170050
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  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.


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No dyno, no tuner, no factory re-flashed ECU! The FiTech 70050 Ultimate LS Standalone EFI ECU kit is the ultimate LS swap computer for DIY enthusiasts who want full control over their engine management. Avoid having to buy additional software programs, learning how to think in computer code, or relying on a questionable 3rd party tuner. The included color touch screen interface allows for custom tuning adjustments to your LS engine as well as a self-learning program to get you on the road. FiTech Ultimate LS EFI is the perfect product for using the factory GM intake, throttle body, and injectors, while leaving the factory GM computer and harness in the junkyard where they belong. FiTech technology is custom cam friendly and is suitable for use with most 4.8 LS, 5.3 LS, LS1/LS6, 6.0 LS, 6.2 LS, and LS7 GM engines.

Kit includes LS engine wiring harness, standalone LS ECU, one wideband O2 sensor and a handheld tuner. The FiTech 70050 is an engine-only ECU, however other FiTech Ultimate LS EFI ECU kits are available to control both engines and electronic transmissions.

Installation Instructions (PDF)


  • LS or similar engines with crank and cam sensors.  
  • Small Block V8 Gen III/IV LS-based Chevrolet street and performance engines.  Contains a 3 BAR MAP sensor for power ader applications that suppors up to 30 PSI of boost.


  • Kit comes with one 02 sensor.  If you'd like to run a second, you may want to source a Bosch 17014 from your local auto parts store.
  • This kit does not work with drive by wire throttle bodies and variable valve timing.  These engines can be modified to remove these components.




Self-learning ECU with touch screen controller for easy setup and configuration.
Sequential fuel and spark control with individual cylinder trim.
Dual Bosch wide band with dual trim control (Self-learning).
3 BAR MAP sensor automatically detects up to 30 psi boost.
Stainless O2 Sensor bung (clamp or weld on).
24X and 58X crank and cam compatible.
Two programmable fan control outputs.
Tach output driver for most tachometers (5V).
Output driver for most speedometers.
Compatible with car and truck coils.
On the fly programmable target AFR and timing (if desired).
Fuel pump relay output.
Custom wire harness (uses factory coil pack sub harness).
Knock sensor control.
Some parts are not legal for use in California or other states with similar laws/regulations

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