Tune Port Injection-TPI

The factory GM ECU, wiring harness, and calibration chip. Your existing TPI intake manifold, fuel injectors, fuel rails, and throttle body all stay. The FiTech kit gives you a self-learning ECU with modern sensor inputs and a touchscreen handheld controller for setup and tuning.

No. The FiTech TPI system works with your existing fuel injectors and fuel rail setup. You do need an EFI-rated fuel pump delivering adequate fuel pressure if you don't already have one. FiTech offers Force Fuel and in-tank pump options.

The single O2 system uses one wideband sensor to adjust the fuel ratio across both cylinder banks. The dual O2 system adds a second sensor so the ECU can trim each exhaust bank independently. Dual O2 gives you tighter closed loop fuel control, especially on engines with cam swaps or uneven exhaust flow.

If you're running a 700-R4 or 200-4R, the standard kits include converter lockup control. If you have a 4L60E or 4L80E electronic automatic transmission, choose one of the kits with full trans control for shift points, firmness, and lockup management.

Yes. The self-learning ECU adjusts to your engine as it runs. If you've swapped in a roller cam, added long tube headers, or changed your intake setup, the system learns around those modifications. No new chip or custom tune file needed. Contact tech support if you need help with your specific build.