Expected intake temps on the track? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-03-2015, 12:04 PM   #21
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Yeah, I love running better fuel, a larger and more efficient turbo and pushing the system a whole lot less overall but still making more power than stock. That is how I had my STi set-up while running E85 with a full ball bering 49lbs/min turbo and a TMIC that ran cooler than my current FMIC.

{I'm waiting for the Trackspeed kit to be finished }

The precision FMIC is a good price I think. I guess since I have the Fab9 one and it fits super well I can use it to help make the correct angled brackets for the Precision if I go that way. But testing first before I give up on that element of the system.

Originally Posted by sixshooter View Post
A small turbo moving the same mass of air as a large turbo will create more heat doing so. It will usually need to create more boost pressure to move the same mass of air. This is often due to the increased resistance to flow.

Boost is, after all, a measure of resistance to flow of air through the engine and exhaust. And when air is pressurized heat is created. The greater the pressure the greater the heat. Smaller turbos generally create more heat to make the same power.

If the OP is curious if 130F is generally considered acceptable for a max intake temp regardless of other variables then the answer is generally yes, followed by a qualifier. If your spark table and choice of fuels can handle it without detonation at the chosen power level (with a little margin for det resistance) then it is fine. Mine will handle much higher without detonation (track surface temps often over 135F in summer and air temps in the 95F range) so IAT is tough to keep low. I purposefully chose an efficient turbo, conservative spark, and 8.4 to 1 pistons to reduce chances of det.
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