Originally Posted by saskins
I live in the Greater Los Angeles Area, and warm to me is like 90. I've noticed a difference when it is cooler then that. I think these engine setups are able to put out a lot more, if they were just properly set up for warmer climates.
Not to be a smart a*s, but I live in Phoenix, AZ and warm to me is like 110
Heat causes gas to expand, meaning it's less dense - so on hot days, even though you're drawing the same amount of air by volume, you're drawing in less air by mass, so you don't have as efficient a bang. This is in no way limited to our cars; every car will have this occur, particularly cars with turbos.