one Q 10 psi on stock compression is about equal to how many psi on 8.8 compression pistons. I got 218 HP to the wheels at 12 psi. is this about right with 91 octane peepee water?
thanks
james

You ran 12 psi on a stock bottom end? Holy shit-shingles. You must have one bad ass block there.

no no!
i have a built bottom end. i was making 221 hp at the wheels with 10 psi on stock bottom end. after the rebuild i am making 218 hp to the wheels at 12 psi. so i was wondering if this is correct.
thanks
james

approx 4% for every point in compression

so fiqure 4% less from 9 to 8 correct
so 212hp on 8 compression
so your about perfect

Stock compression at 10 psi you should be around 230HP to the wheels, so take 4 % off of that, you get 220.8 HP to the wheels at 10 psi. Your numbers are a tad bit low, but not a whole lot.. You should be around 240 HP to the wheels at 12 psi, or close to that anyway..

>>>You ran 12 psi on a stock bottom end? Holy shit-shingles. You must have one bad ass block there.<<<

I ran 16psi on the stock bottom and didn't break anything besides the piston that was already broke ;)

hmm makes me wonder how much HP I'll get when I put my 10.5:1s in :) Must be good stuff! Hicomp turbo here I come! Now to get rid of this damn SPI gauge I"ll never hit 30 PSI!

How long were you at 16 psi for?

Just the 40 minute drive home. Hit 16psi like 10 times or so.