Quote:
Originally Posted by Amnizu
Couple things on this. Colder air = more HP. The colder the ambient temp the more dense the air, the more dense the air the greater the amount of oxygen, the great the amount of oxygen the higher the air fuel ratio can be pushed, the ECU should do some auto adjustments for this.
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Actually the air fuel ratio stays the same, but more fuel can be mixed with the air to have more total fuel and O2 to burn. Timing can also be advanced without the risk of detonation due to the cooler mixture temps, both due to the cooler incoming air and the intercooler working more effectively.