2nd Generation Specific 1986-1992 Discussion

Intake Temps/power Gains

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Old 01-13-2004, 10:45 AM
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Originally Posted by FCmaniac' date='Jan 13 2004, 07:11 AM
So you guys are saying 1% power increase with nothing else changing? I was thinking the #'s could be more because the 10 degree decrease or whatever could allow you to turn up the boost a little, no?
i wonder if theres a point at which you get no gains, or less gains
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Old 01-13-2004, 11:47 AM
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Originally Posted by j9fd3s' date='Jan 13 2004, 08:45 AM
i wonder if theres a point at which you get no gains, or less gains
Good question! There prolly is a cap on cooling.
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Old 01-13-2004, 02:25 PM
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Thats only part of the equasion. Each 25 degree reduction requires 1 point less octane. Meaning you have more available octane = less detonation / preignition.
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Old 01-13-2004, 03:12 PM
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Where'd you guys hear about the 10 degrees equals 1% rule? I've never heard that one before.



For every degree lower in intake temp, it's one degree lower in exhaust temp.
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Old 01-13-2004, 04:01 PM
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Originally Posted by neevosh' date='Jan 13 2004, 01:12 PM
Where'd you guys hear about the 10 degrees equals 1% rule? I've never heard that one before.



For every degree lower in intake temp, it's one degree lower in exhaust temp.
Various engine building books. Info from Sparco, Greddy, Hks.
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Old 01-13-2004, 04:22 PM
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How about all the people who have cone filters sucking in air from the engine bay. Im not sure but i would estimate the air in the engine bay to be well over 250 degrees. Do the math.
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Old 01-13-2004, 06:03 PM
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Originally Posted by RONIN FC' date='Jan 13 2004, 06:22 PM
How about all the people who have cone filters sucking in air from the engine bay. Im not sure but i would estimate the air in the engine bay to be well over 250 degrees. Do the math.
Yeah, most of the gains from warm air intakes are from increased flow, not temp.
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Old 01-13-2004, 07:17 PM
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Originally Posted by RONIN FC' date='Jan 13 2004, 05:22 PM
How about all the people who have cone filters sucking in air from the engine bay. Im not sure but i would estimate the air in the engine bay to be well over 250 degrees. Do the math.
130-160 degrees under the hood depending on location.
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Old 01-14-2004, 10:42 AM
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Originally Posted by RONIN FC' date='Jan 13 2004, 12:25 PM
Thats only part of the equasion. Each 25 degree reduction requires 1 point less octane. Meaning you have more available octane = less detonation / preignition.
well cold air is more dense, so you need more gas to run at the same mixture or cold = leaner, hot = richer
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Old 01-14-2004, 11:01 AM
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Originally Posted by j9fd3s' date='Jan 14 2004, 08:42 AM
well cold air is more dense, so you need more gas to run at the same mixture or cold = leaner, hot = richer
This is true. But nothing the ECU shoudnt detect and compensate for. Unless you have a carb.
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