Comptech aftercooler?
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Joined: Apr 2002
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From: Occoquan
Gack! All this speculation is just plain crap. Listen here are some simple facts based on the laws of physics:
1) By decreasing the intake temperature WITHOUT changing ANYTHING else. And what I mean by this is that if you maintain the same size piping as you had previously. Your boost level WILL decrease.
2) By decreasing the boost level your horsepower WILL DECREASE.
Now, on to the reasoning behind cooling the intake charge... All you're doing by cooling the AIT is making it safer to run higher levels of boost. The more you compress air or any gas for that matter the more heat will be released. Once you get too high of an AIT temp you run the risk of detonation regardless of timing. Now... addressing Yellow Streaks comments about timing. There are "zones" of AIT that the ECU will adjust timing accordingly. Once you're in the "green" for lack of a better term, the ECU is going to leave the timing alone. Weather you're at 80 degrees AIT or at 20 degrees you're still in the green. Now on to the 7-8 psi safetly... By cooling the AIT with an intercooler / aftercooler you can run about 10psi safetly. The limiting factor after securing a safe AIT becomes the strength of the block / head gasket. You can simply blow the engine without detonation based on increasing cylinder pressure too much. OK, I'm done...
1) By decreasing the intake temperature WITHOUT changing ANYTHING else. And what I mean by this is that if you maintain the same size piping as you had previously. Your boost level WILL decrease.
2) By decreasing the boost level your horsepower WILL DECREASE.
Now, on to the reasoning behind cooling the intake charge... All you're doing by cooling the AIT is making it safer to run higher levels of boost. The more you compress air or any gas for that matter the more heat will be released. Once you get too high of an AIT temp you run the risk of detonation regardless of timing. Now... addressing Yellow Streaks comments about timing. There are "zones" of AIT that the ECU will adjust timing accordingly. Once you're in the "green" for lack of a better term, the ECU is going to leave the timing alone. Weather you're at 80 degrees AIT or at 20 degrees you're still in the green. Now on to the 7-8 psi safetly... By cooling the AIT with an intercooler / aftercooler you can run about 10psi safetly. The limiting factor after securing a safe AIT becomes the strength of the block / head gasket. You can simply blow the engine without detonation based on increasing cylinder pressure too much. OK, I'm done...
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Joined: Jun 2002
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From: Waterford
[QUOTE]Originally posted by modifry
[B]S2ktroup dynoed at 292, and I thought I saw a post about 300+ on a vortech running +7.5 psi.
I've not dynoed, but hopefully one day soon, Troup and I will make a highway run to see what the difference is.
[B]S2ktroup dynoed at 292, and I thought I saw a post about 300+ on a vortech running +7.5 psi.
I've not dynoed, but hopefully one day soon, Troup and I will make a highway run to see what the difference is.
