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Originally Posted by A1337STI
does the turbo's efficiency change if its compressing cold air or hot air ?
And yes, assuming 100% IC efficiency that makes perfect sense. I've read on the Interweb that IC are usually 95% efficient though.
eeeerr wait. Given PV=nRT , if you took 1 liter of air at 2 psi and pulled 100 F out of it, or pulled 130 F. you'll get a larger pressure drop with the more heat you pull out of it (same number of air molecules in a given space) yes i'm using a formula for a contained space, and not flowing air , but i belive its applicable (qualitatively)
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I don't believe the efficiency changes significantly with the temperature ranges we're talking about... +/- 30*F isn't really that much.
What does 95% intercooler efficiency mean? It can take out 95% of the heat the turbo put in? It can get within a certain percentage of ambient? I guess my point it, unless you've got a temp probe at the intake manifold and take before and after readings, you don't really know how well the CAI works. I'm not saying it doesn't help, but if it's only 1 or 2 degrees colder, it's probably not reducing your detonation risk at all.
For the record, I used to run a CAI and now I don't, but that's only because I switched to a BigMAF and FMIC. IMO, intakes in the fender are the way to go, simply because they get the filter element out of the dirty/crowded engine bay and into a high pressure area.