Quote:
Originally Posted by PoorMans180SX
IMHO this is a silly decision. 9:1 and 10:1 really aren't that different on a turbo engine, I seriously wouldn't worry about it. Keep the pistons, you'll make the same power. I make the same kind of decisions all the time and always end up kicking myself in the butt because all I did was waste time I could have been driving the car.
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In all honesty, I somewhat disagree with this. The high compression ALWAYS yields a much better power curve and increases the area under the curve. Outright power is a side benefit, but the biggest benefit is definitely area under the curve and all around better drivability (especially out of boost and boost transition phases). Is it worth the trouble?? 50/50 on this as if he has the means and cost is minimal, why not!
What I find silly however is people still building 8.5:1 and 8:0:1 compression engines. Tuning technology and fuel technology allow us to really approach the knock limit and still be within a safe region. I mean, the damn Honda boys have been running 9.5:1 and above compression engines for YEARS and once the tuning solutions were figured out, I see so many people running 10:1 compression on E85!!
My 9.5:1 SR20 with a T3/T04E 0.64 back end and 50 trimmed wheel had similar throttle response to my 8.5:1 SR20DET with a GT28R on there in addition to area under the curve. The T3 9.5:1 had much better out of boost throttle response and drivability.