TPiS

Since we introduced our Fuel Pressure Regulator in 1987, GM has adopted on the '88-'90 vehicles the fuel pressure that we have found to work well on the '85-'87's. For the '88-'90, we find that 49-52 works well. The LT1 fuel pressure is unusually high for the way the computer is calibrated. We are finding that, unless you send us your computer for reprogramming, you will be faster at 39 PSI, with a stock to bolt on modded engine. Installation time: 30 minutes. Lifetime guarantee. Emission-legal in all 50 states (EO Number 235-2).

This is one of the main tuning tools for wide open throttle, it's like changing main jets on a carburator, but with a simple turn of the screw. If you bring your car to a dyno with a wide band air fuel ratio gauge, this will fine tune the air fuel ratio. Don't forget to pick up a fuel pressure test gauge too.

Note: One of our competitors suggests that raising the fuel pressure will clog your catalytic converter. I suggest he does not know how the system works. Higher pressure atomizes the fuel better, while the Oxygen Sensor maintains the proper air/fuel ratio, at part throttle, closed loop operation.

(L98/LT1) Fuel Components