The question is for my SHO powered camaro project. The engine is a 3.2 block from a 94 ATX. I have 2 that I am going to have inspected. One is the origional engine from my 94 turbo SHO and has 242K and was removed due to a cracked piston. Engine is very clean inside the other block is also from a 94 with 67K and has 2 spun bearings. Needs 2 rods but the crank is good. At any rate
3.2L block bored to 3.3 with ported heads and +1mm valves. I have not decided what cams I am going to go with yet, EH runners, deleted butterflies and shafts. This will eventually loose the SHO intake in favor of 2 large tanks with short runners down the road. The car is getting a electronic boost controller to set boost VS rpm or maf and the boost will regulate to maintain a flat tq curve to a RPM of my choosing (probably 7500-8000)
My question is what compression do I want to go with? I do not know where the knock limits are for the stock compression on 93 octane. I will be changing between E85 or E100 and pump 93 octane. I do know that E85 can support much higher compression than regular pump gas. Talking to a few people on here via PM and on the phone I was originally going to settle for 9.0:1 and use meth or water injection if knock was a problem down the road, but now that I am setting up the car for E85 I want to keep the compression as high as possible. I was considering 10:1 or even 10.5:1. I know it is not the same engine but I have been comparing Audi S4’s and supras to see what they use.I have had 2 personal experiences with good friends of mine running 24psi with no problems on S4’s. school me on what the SHO engine likes from a detonation stand point.
oh yeah this is getting a small shot of NO2 also but the shot size has yet to be determined.