Originally Posted by 020NN20

i know this is an old thread, but it kinda applies to me, I have a 383 that im building, pt78 with a .96 housing, and reading this thread, im guessing i should change to a bigger exhaust housing? If so, (kinda new with turbos) Do I just have to change the housing or do I need a new turbine wheel as well? Any help would be appreciated. Thanks, Dennis

Originally Posted by Mas280

I am using the TC78 right now with 1.15AR, The turbo spools very fast. Ran a best of 10.0@148 on 8psi E85 LS3 engine

Originally Posted by DrTurbo

Yes you will pick up another 40-50hp with the swap to the 1.15A/R. Ask the guys from Baker Engineering, they did some back to back with the .96A/R and then swapped to a 1.15A/R unit.

Originally Posted by Johnv

I have a TC 78 & 383 also and found it fell on its face around 5000 rpm,
went to a 1.32 ar housing and its much better, spools just as fast and makes power all the way to the limiter.

Gonna try a race cover next.

Originally Posted by 98Z28CobraKiller

Something isn't working right. That ET is horrible for the MPH.

Originally Posted by rosey

<3000lb rx7 street car with IRS and a manually shifted t56, that's whats "wrong"

Originally Posted by 94 slow

Was this on E85?

Originally Posted by 020NN20

Sorry to hijack the thread, but have a question, I have a forged 383, Ported 317's, with a ported prof low intake im building, have a pt78 with a .96 exhaust. is that gonna hurt me, if so i'd rather change it before i finish mocking up the rest of the kit. Please lemme know, thanks