I think the biggest limiting part on these motors would be the intake manifold. I also agree with the above post talking about the throttle body being a restriction on a hot air due to it not being under boost pressure like the 86/87. Much more sensitive to causing a restriction when the engine is having to suck the air through a part rather than being forced through under pressure like the intercooled motors. It may be something to look into getting a 70mm TB to work on those cars running turbos with larger inlets than 62mm. But with all cars they are not going to run the numbers with out tuning and track time. Since the hotair crowd does not have as much of a following as the 86/87 its seems there are not enough people pushing the envelope or breaking new ground on what it takes to get these cars into the solid 11-10 sec zone. The intercooled cars have been tuned to death. There are many cars running near 10's with mostly stock parts on factory sealed motors. Once someone overcomes the above mentioned engine differances and is dedicated in tuning to the end (suspension too) then Im sure thesecars will run the times everyone wants. Tuning is the biggest factor.![]()
i would think going to a 70mm tb wouldnt do much if the inlet let of the turbo doesnt match. i have yet to take a mic. to see how big the inlet of my turbo is but lets say its a 65mm. i would think if you went with a 65mm tb that would be better since its a nice straight shot with no edges to hit. so lets say i could get a 70mm tb and the inlet to the turbo is only a 65mm. if i could send my compresser side of the turbo to limited or precision and have them bore the inlet to 75 that would work really well i would think. im going to look into this more once i get my hands on a stock 87 tb but i dont think there is much meat on the compressor side to bore it open more. so im going to mic it and see what size tb i really need and go from there.