Ford Mustang Forum - View Single Post - How much HP does the A/C "steal"?
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post #2 of (permalink) Old 06-04-2014
rpaulg87
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Joined: May 2014
Location: Atlanta
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Well it is another pulley going. Even in my prior car SRT-8 6.1l I could slightly tell the diff, it really depends on the motor size and if it is slightly bothered by it, you can tell if you turn it on and off. I have no clue of how to measure how many ponies it takes, but it is extra work-load on the motor. I know with a 6.1l it never effected my MPG just performance. Low speed fan kicked in @ 219f, high speed 226f, that even in a GT-500 5.4l or 5.8l is ridiculously high, and flat out robs power, the HEMI's run hot as hell. A\C on though triggered the hi-speed fans naturally so it actually ran "cooler" with the A\C on...

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