FiTech 70003 Ultimate LS EFI, LS1/LS2, 750 HP, w/o Trans Control

The FiTech 70003 Ultimate LS EFI kit is the ultimate LS ECU for DIY enthusiasts who want full control over their engine. Avoid having to buy additional software programs, learning how to think in computer code, or relying on a questionable 3rd party tuner. FiTech puts the engine and transmission EFI management back in your hands. The included color touch screen handheld controller allows for custom tuning adjustments to your LS engine as well as a self-learning program to get you on the road.

Leave the factory LS computer, wiring harness and intake in the junkyard where they belong. The FiTech Ultimate LS combo is a perfect match for 5.3 LS and 6.0 LS truck motors with tall and not so elegant factory intakes. The low profile fabricated sheet metal intake features short runners for a tricked out engine bay as compared to factory plastic engine covers. FiTech technology is custom cam friendly and is suitable for use with most 4.8 LS, 5.3 LS, LS1/LS6, and 6.0 LS engines with cathedral port cylinder heads producing up to 750 HP.

Kit includes:

• Fabricated LS sheetmetal intake manifold
• 102mm billet LS throttle body
• Fuel rail with 55 lb/hr fuel injectors
• Handheld controller with data logging capability and windshield mount
• Fully programmable self-learning LS ECU
• LS wiring harness 
• Wideband O2 sensors

FiTech 70003 includes an engine-only ECU, however other FiTech Ultimate LS EFI kits are available to control both engines and electronic transmissions.

• Intake manifold will fit Cathedral Port LS1/LS2/LS6 heads.
• Small Block V8 GEN. III/IV LS-based Chevrolet street and performance engines with a 1500-6500 rpm power-band up to 750 HP to the flywheel and contains a 3 BAR MAP sensor for power adder applications that supports up to 30 PSI of boost.
•   4.8 L / 293 c.i. LR4, LS1, LS2, LS6
•   5.3 L / 325 c.i. L33, L59, LM4, LM7
•   5.7 L / 346 c.i. LS1, LS6
•   6.0 L / 364 c.i. LQ4, LQ9, LS2

Installation Instructions (PDF)