[78mach1]

Originally Posted by Darrell I run 15psi with just over 9:1 compression.......

well sorry, i figured cause its a street car, he wouldnt want to go all out.

i didn`t know what his compression ratio was so i was just going off the top of my head.

will a stock block hold 15 psi?

[ryans88gt]

Originally Posted by 78mach1 well sorry, i figured cause its a street car, he wouldnt want to go all out. i didn`t know what his compression ratio was so i was just going off the top of my head. will a stock block hold 15 psi?

So far so good....figure about 650 flywheel hp

[78mach1]

ok so heres a question (not to hi-jack the thread)

on my 78, i have a 306 with a stock crank, but its got a set of hypertectic flat tops, it puts the compression around 8.5:1

i would like to get some big chamber heads on it to get it around maybe just 8:1, then do a big single, what do you think it could take? (the engine only has 2k miles

[grnstang]

don't worry you shouldnt have any problems just make sure you get the car tuned with a chip on a dyno after you install the supercharger i recommend getting a 4 bank SCT chip, order it blank, and have someone tune your car so it is safe

[1slo5.0]

Originally Posted by 78mach1 well sorry, i figured cause its a street car, he wouldnt want to go all out. i didn`t know what his compression ratio was so i was just going off the top of my head. will a stock block hold 15 psi?

I was refering to my daily driver. 100% street car that has only seen the track a couple times. The white 93 GT that I have for sale. 15psi, stock block and pump gas.

[1slo5.0]

Originally Posted by 78mach1 ok so heres a question (not to hi-jack the thread) on my 78, i have a 306 with a stock crank, but its got a set of hypertectic flat tops, it puts the compression around 8.5:1 i would like to get some big chamber heads on it to get it around maybe just 8:1, then do a big single, what do you think it could take? (the engine only has 2k miles

Not worth it. The pistons will never hold enough boost to justify running 8.5:1 (or less compression).

[78mach1]

Originally Posted by Darrell Not worth it. The pistons will never hold enough boost to justify running 8.5:1 (or less compression).

so do you think that with what i have (64cc chamber heads/ hyper pistons) is able to hold like 8 psi?

or do you feel that going threw all the trouble of doing a turbo set up, i might as well have a bottom end that can support what a turbo is capable of?

[1slo5.0]

Originally Posted by 78mach1 so do you think that with what i have (64cc chamber heads/ hyper pistons) is able to hold like 8 psi? or do you feel that going threw all the trouble of doing a turbo set up, i might as well have a bottom end that can support what a turbo is capable of?

You don't need 8.5:1 (or 8:1) for 8psi. 8psi is low boost. Your engine will hold that just fine. In your last post you said "big single". When I think of a big single, I think of a 88mm or bigger turbo pumping out a ton of boost. Your engine will not handle that but it will handle 8psi safely. I would run 9:1 though. You don't need such a low compression ratio unless you are running alot of boost.

[Sleeper_Stang_89]

Originally Posted by Crazyhorse347 I am putting out 502 RWHP and my block is stock....still works and runs fine. One question though why does the meth injection crack it.

Its an inside joke about a member that is now banned.

[78mach1]

Originally Posted by Darrell You don't need 8.5:1 (or 8:1) for 8psi. 8psi is low boost. Your engine will hold that just fine. In your last post you said "big single". When I think of a big single, I think of a 88mm or bigger turbo pumping out a ton of boost. Your engine will not handle that but it will handle 8psi safely. I would run 9:1 though. You don't need such a low compression ratio unless you are running alot of boost.

ya big single was the wrong word to use for what i was trying to explain. lol

do you think that building a turbo set up to run 8-10psi is a waste of time?

with what i have, what do you think my weakest link is? crank? pistons?

[1slo5.0]

Originally Posted by 78mach1 ya big single was the wrong word to use for what i was trying to explain. lol do you think that building a turbo set up to run 8-10psi is a waste of time? with what i have, what do you think my weakest link is? crank? pistons?

Pistons are going to be the weak link in your engine. 8-10psi is going to be about the max with those pistons.

[ryans88gt]

You can run a lot of boost on hypers, 20+ PSI. As long as you have 0 detonation. The slightest hint of detonation and you will have piston pieces instead of whole pistons.

With 8-10 PSI, it'd be a lot easier to just go supercharged. You give up a little power, but for a street car, 600 hp is overkill anyway.