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Old 13 Feb 2008, 11:31 am
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Default What is a good psi boost for this engine?

87 Acura Integra D16A1. Last trip to a dyno came back 110HP @3000RPM stock n/a as it is after 21 years of use. Only 89k miles on it now.On the way as we speak:-New pistons/rings for a ZC; slightly lower compression than stock-New I-bar style rods-New stock valves -New stock valve springs-New head gasket-Lighter flywheel-New fuel injectors-New fuel pump-Pacesetter exhaust header (yea, I'm cheap, but they're easy to replace)-New 2.25" Catalytic (even though my state doesn't require a cat)-2.25" exhaust cat to tip-Magnaflow muffler-New water pump-New timing belt-New thermostatWhen I pull the motor:-Get stock crankshaft checked for straightness. good to 220hp, might replace if needed-P/P stock A1 header-header/deck resurfaceHow much PSI should I use with the least mechanical/heat wear with a supercharger with this setup? I was told 3PSI was good, but I'm wondering if I can go higher. I don't want to turbo or nos.
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Old 13 Feb 2008, 11:46 am
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The answer really has more to do with the compression ratio. Have the heads CC'd and then calculate your compression ratio. If you have 7.5:1 you can run about 6 punds of boost, if you are around 8.5:1 then you need to lower it to about 4 PSI..also if you plan to run a turbo you need to select a cam that is turbo rated, and the head gasket should be slected with the turbo in mind as well. Im not sure what the stock comp ratio is on your engine but if its higher than 8.5:1 I would consider getting dished pistons to lower it.
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Old 13 Feb 2008, 12:01 pm
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i would go with wat johny said and if u c this again johny do u work if u do plz email me n tell me where u work?
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Old 13 Feb 2008, 12:16 pm
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Using psi to decide how much your motor can withstand is irrelevant. Different superchargers make different power at a certain psi, just like with turbos. Just get a turbo kit for your motor and see what the stock psi is at on the kit then go from there. May wanna add a cylinder hone in that list also unless the person who's rebuilding your motor is doing it already (should if they know what there doing) .
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