Originally Posted by Franc Rauscher

In english, higher temps, higher humidity and higher elevation will give you lower acceleration.

High barometric pressure, sea level at 40 degrees F would give you the best engine performance. But that cold would hamper tire performace so unless it was at the end of a warm day you would lose some power transfer to the ground to hard tires on cold pavement.

NA's are less suseptable to variances than an SRT because the SC compresses the air, amplifying the overall effect. Again cool dry, dense air matters as it increases the ratio of compression by amplification. The more dense the air, the more you can force into the cylinders. The heat of explosion is the same so more air is a bigger bang. Dryer air means a more complete explosion. Again bigger bang.
Sea level has more air per cubic foot that high altitude. Again, bigger bang.
Bigger bang, more HP and torque.

Hope that helps.


roadster with a stick