9:7.1 compression How many pounds of boost?
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On The Tree
Joined: Apr 2010
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From: Philly
9:7.1 compression How many pounds of boost? Im runnin a 355 LT1, 9:7.1 compression, stock cam, coated skirt spreed pro pistons, Hell Fire rings, Eagle I-beam rods, stock polished crank and H-series bearings, ARP head and main studs, Cometic head gaskets, aluminum camaro heads, gasket matched, bowl blended and back cut valve seats, stock diameter Manley tool steel springs and hardened pushrods.
How many pounds of boost am I gonna be able to run.
I was thinkin 10 lbs max. Not sure tho.
How many pounds of boost am I gonna be able to run.
I was thinkin 10 lbs max. Not sure tho.
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I think that the 8.7 lb wastegate spring should get you to the 450-460hp that you want. you shouldn't need the meth injection but it would be safer and a lil more hp. what size injectors are you running?
If you haven't bought the turbo yet get a T70. Master Power has em for ~$600 delivered Rob @ Modular Turbo is a sponsor here. For comparison I have a rearmount with a T70, stock iron heads, stock 191/196 .45/.46 and it would suck a 60mm turbo dry. The RR makes ~400 RWHP. Also the cam is a big part of the CR and boost equation especially look at LS. Most say 112 -114 should be your goal.
Good luck
Also most believe meth injection is best >~12 psi but it also provides increased octane and allows more timing and boost. My inlet air temps go down as I accelerate last time at track I launched at ~83 degrees F and finished <80 F.
As for stock cranks they take a ton!
A friend is making ~675 RWHP with stock rods and crank, the engine has three years at the track on it. The important part is to use good rod bolts and we also use main girdles. The stock blocks and internals are alot stronger than most give them credit for.
A friend is making ~675 RWHP with stock rods and crank, the engine has three years at the track on it. The important part is to use good rod bolts and we also use main girdles. The stock blocks and internals are alot stronger than most give them credit for.
And for how many psi, I ran the RR with stock pistons and with 93 I ran 9 psi without a problem. I switched because I broke a valve spring and just built it correctly.
PSI is just a number. A motor with larger cam, valves, head etc may have 9 psi but make twice the HP of a smaller headed setup with 15 psi.
You want to avoid detonation! Meth is an excellent aid, but it should not be used to fix a system that was poorly planned.
Good luck
PSI is just a number. A motor with larger cam, valves, head etc may have 9 psi but make twice the HP of a smaller headed setup with 15 psi.
You want to avoid detonation! Meth is an excellent aid, but it should not be used to fix a system that was poorly planned.
Good luck
The stock rods will fail before the crank. Some people have good luck with them but I would just spend the extra 250 for cheap i beams.
I would try to run meth and aim for 12 psi. you should be happy with that and it should be trouble free.
I would try to run meth and aim for 12 psi. you should be happy with that and it should be trouble free.
