Quote:
Originally Posted by NStimac
Dougal what about the hot @$$ turbo your passing all this air through. How hot do you think it is 400-200 F. Never minding the fact that a turbo isn't 100% efficient (like your math implies). Idea gas laws are ideal. What's happening under the hood isn't. 10psi + you will see a gain from an ic. Below that you might see a drop in EGTs but preformance wise you might not be gaining anything.
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The turbo compressor doesn't pick up any significant heat from the exhaust. Mainly because the bearing core is cooled by engine oil and is quite a long path for heat to conduct along.
My maths is based on a 70% efficient turbo compressor, I have temperature measurements to back them up and since your average turbo compressor map plots from 65% to 74% it's a good figure to use.
At 15psi with the T25 I measure 115C
Calculated at 70% effiicency I get 113C
Using an IHI turbo with a damaged compressor wheel (dust erosion) 15psi resulted in over 140 deg C, the equivalent of 55% efficiency.