ideal compresion?
Thread Starter
single digit dreamer
iTrader: (6)
Joined: Mar 2002
Posts: 9,757
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From: omaha ne
ideal compresion? i am going to be geting some forged pistons soon and am wondering if i should drop the compresion some? and if so how much.
stock is 9.4-1, i can only run 6-7psi now before detonation sets in. the blower has the capasity to run 10+psi on my current set up so if i droped the compresion i would be able to up the boost.
i have no intercooler and may hit it with some nitrous in the future if that makes any diference. 92 octane also.
stock is 9.4-1, i can only run 6-7psi now before detonation sets in. the blower has the capasity to run 10+psi on my current set up so if i droped the compresion i would be able to up the boost.
i have no intercooler and may hit it with some nitrous in the future if that makes any diference. 92 octane also.
Thread Starter
single digit dreamer
iTrader: (6)
Joined: Mar 2002
Posts: 9,757
Likes: 4
From: omaha ne
Re: ideal compresion? after doing a search i see 9-1 is a common ratio so now my question is since i have a blower that makes instant boost at low rpm's would that change the acepted 9-1 ratio at all?
i am told lightings run 8.5-1, i will probably stick with the 9-1 unless someone on here thinks it should be less.
i am told lightings run 8.5-1, i will probably stick with the 9-1 unless someone on here thinks it should be less.
Re: ideal compresion? i chose 9.0:1 on my street/track car.
with the lower CR the more boost you can run, but loose throttle response and streetabilty, i think 9:1 is just right for a turbo car on the street, not to laggy but able to run some good boost.
for notes Y2K hawk (harlan) has his 700rwhp beast at 8.5:1 CR
and Cablebandit (Jerry) had his 580 rwhp beast at 8.9-8.7:1
with the lower CR the more boost you can run, but loose throttle response and streetabilty, i think 9:1 is just right for a turbo car on the street, not to laggy but able to run some good boost.
for notes Y2K hawk (harlan) has his 700rwhp beast at 8.5:1 CR
and Cablebandit (Jerry) had his 580 rwhp beast at 8.9-8.7:1
Re: ideal compresion? I think 9:1 would be a fine choice. I think thats a good choice. Once you drop compression, you will lose a little boost. Meaning it will take a smaller pulley to maintain the same amount of boost you are currently running. Instead of seeing 6-7, you will probably see 5-6 with the existing pulley.
BTW - I like your idea of entering PE earlier.
BTW - I like your idea of entering PE earlier.
