Tpis 90mm throttle body
Tpis 90mm throttle body Is anyone else on here running one of these? Mods are LS1 with 243 heads, FAST 90, TPIS 90mm TB, 33lb Siemens injectors, Svede OTRCAI. FTI 3600. I picked one up with a FAST 90 awhile back and can't seem to get the thing dialed in on the low side. If we get it so the rpm doesn't hang on decel, the idle ends up being too high even with 850 commanded. If we get the rpm to not hang and act normally on decel, then any quick hit on the throttle causes surging or a stall. If I do a burnout out of the water box, when coming out I need to be careful to catch the rpm to prevent it from stalling out. Everything else with the tune is perfect, the tuner has tuned my previous 06 GTO with no issue along with dozens of other mild to wild engine combinations. No leaks of any kind, MAF is clean, I have run out of idea's other than selling this TB if I can find a NW 90mm.
Any input would be appreciated.
Any input would be appreciated.
