comp ratio
Joined: Sep 2003
Posts: 25,895
Likes: 429
From: Pittsburgh PA
Car: 89 Iroc-z
Engine: 555 BBC Turbo
Transmission: TH400
Axle/Gears: MWC 9” 3.00
Re: comp ratio
Depends on the chamber design and octane of your fuel and how good of a tune.
Street car with aluminum heads up to maybe 15psi, 93 octane, no higher than 9 to 1 i'd say but I havent tried any higher than 12 psi yet on mine. So maybe 15 is too much.
8.5-8.8 can handle abit more.
If you run meth/water injection probly could see 15-20 psi depending. race gas even higher. All depends
Street car with aluminum heads up to maybe 15psi, 93 octane, no higher than 9 to 1 i'd say but I havent tried any higher than 12 psi yet on mine. So maybe 15 is too much.
8.5-8.8 can handle abit more.
If you run meth/water injection probly could see 15-20 psi depending. race gas even higher. All depends
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