Temperature and HP

SouthArk370Z

The ECU starts limiting power when the Intake Air Temperature gets to ~85-95 F. You are not gaining power at lower ambient temps, the ECU is restoring normal operation. The question should be: How much power am I losing at 100 F? (My answer is: I dunno.)

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Troyz

It feels like 25 hp.

Chuck33079

How are you estimating that? The only real way to figure it out would be to dyno the car at 100 degrees, and add back in the drivetrain loss. Even then, it wouldn't be 100% exact.

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synolimit

Its not the ecu per say, its the tuner. You can pull whatever timing you want based on intake temp. The way its setup though is based on possible experience with knock at higher temps. Instead of pulling timing individually the main timing map can just pull with temps which is real easy. But you could set the timing in stone in the timing/knock maps and set intake temps to all zero. You won't lose power then based off of temps but you'll be driving around in cooler temps with a crappy tune because the timings so low so it works when its cold or hot out. Here's a pic of my WRX. At 85 degrees it pulls zero timing. At 86 degrees it pulls 0.35 and so on.

FYI in the turbo world 1 degree of timing can be about 10hp. So 85 vs 100 we're looking at only 0.35. The power loss is minimal with-in the tune but denser/cooler air can get you a few ponies. At 104 though and -2.11 you're looking at a good 20hp loss.

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