Less Power With A/C On

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Originally Posted by BoxMann

I know that running the A/C is a draw on engine power, but it seems the Boxster's loss of power is quite significant, much more than any other car I've driven.

Anyone else notice this? Is this just a characteristic of the car?

The A/C compressor only consumes about 2-3hp which is not very much unless you have one that is failing. Then it will add significantly more load. Revs matter and keeping the car between 3k-6k will eliminate that lagging feeling.

In lap time comparisons I see very little difference with it on. Hot weather has a much greater effect on performance than running the A/C in my testing. Once the car becomes heat-soaked I may give up 2-3 seconds per lap due to both engine and tire grip losses. My personal best laps always happen with plenty of cold air at the intake when ambient temps are 50-60F here in SoCal.