hey guys i was lookin around i see that tpi doesnt liek cams that have alot of duration and lope. now I know u can do it with t a lt1 or a 80's stang. so why not tpi? All my freinds are into stangs and i asked himn and he said when he put his cam in he had to switch it to mass air so it woudl run right. he said up to 88 stangs were preset in the comp and u can;t change anything but wiht mass air it adjusts to changes u make. so i was just wondering if there is somthing u can do for tpi that is fairly cheap. thanks

 

89,

It's true that mass air systems are much more forgiving to modifications. Unfortunately, the systems used in ThirdGens are limited, not by the hardware, but the ECM firmware. The firmware limits are 255g/S intake air flow. At any flow beyond that, the ECM basically ignores the MAF and delivers full fuel flow.

Speed-density schemes, like TBI and later TPI engines, would require a programming change to work well with the more aggressive cam profiles, but have no such limit on intake air measured volume.

The ideal system is one that uses a MAF to measure flow, and a MAP to measure manifold pressure/vacuum, like the '93 and later LT1s. Converting to that would be costly and time-consuming, but would remove any such limitations. You would still likely need to reprogram the PCM to make optimal use of the setup, but it would at least run without problems on stock programming.

Imcidentally, your '89 should have come from the factory with a MAF system already installed.