Intercooler Question?
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From: San Antonio, Tx
Intercooler Question? I have an sts kit with no intercooler and running 6psi with a 2 bar SD tune. My question is how much more of a power increase can I expect to see with a cooler charge. Reason being when I hit it, boost hits and the car pulls hard at first (around 4psi) then when the boost rises from 4psi to 6psi it feels like it does not keep increasing in aceleration. Is this because the computer is starting to pull timing out due to increasing AIT's? I have plenty of fuel as evedent by my wideband. Only at 11 to 1 AFR. I plan on buying an intercooler asap, but want to make sure that is what the problem is and hopefully nothing else. Any input or dyno comparison would be helpful.
THANKS.
THANKS.
Joined: Jun 2004
Posts: 1,501
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From: Ft. Irwin, California (But Virginia is home)
I have an sts kit with no intercooler and running 6psi with a 2 bar SD tune. My question is how much more of a power increase can I expect to see with a cooler charge. Reason being when I hit it, boost hits and the car pulls hard at first (around 4psi) then when the boost rises from 4psi to 6psi it feels like it does not keep increasing in aceleration. Is this because the computer is starting to pull timing out due to increasing AIT's? I have plenty of fuel as evedent by my wideband. Only at 11 to 1 AFR. I plan on buying an intercooler asap, but want to make sure that is what the problem is and hopefully nothing else. Any input or dyno comparison would be helpful.
THANKS.
THANKS.
You are probably correct on all accounts. I logged my STS in Hawaii before and adding a FMIC. Street driving before FMIC = IAT's 135-155* @80* outside temp. After FMIC = IAT's 95-100* @80* outside temp. This is a HUGE difference in intake temp (and thus the DENSITY of air going into the engine.) In short STS is full of $hit stating that you don't need an intercooler, period.
The PCM stock pulls timing with IAT's over about 100*. Most tuners will adjust that to 106-110*, but usually not much higher. The power loss you feel is most likely the PCM pulling timing for the high IAT's. It will pull from 1-5 degrees depending on how high the IAT gets. A FMIC will correct this and give you noticably more power
BTW, my testing was pnly at 5PSI.
i have just got my intercooler in but waiting on piping to come in to finish it up.from my research an intercooler will basically free up a couple of degrees of timing and seeing the norm is 25hp per degree increase...should be a noticable difference.
Joined: Jun 2004
Posts: 1,501
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From: Ft. Irwin, California (But Virginia is home)
Thread Starter
11 Second Club
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Joined: Mar 2007
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From: San Antonio, Tx
Yes I have hipo valve springs got the whole cam kit. Also I am running a ls6 high volume oil pump and oil is coming out the turbo when I start it. I have the sts oil check valve but do I need a restrictor as well?
Joined: Jun 2004
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From: Ft. Irwin, California (But Virginia is home)
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