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is it true?

This is a discussion on is it true? within the Firebird / WS6 forums, part of the Vehicle Specific category; is it true that a car losses performance when you put the ac on and that you should not put ...

  1. #1
    now greybat66
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    navy blue metalic
    1998 trans am conv

    is it true?

    is it true that a car losses performance when you put the ac on and that you should not put the ac if you are going faster than 80 miles per hour . Thank you.

  2. #2
    Senior Member jrc1122's Avatar
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    Liquid Red
    2009 Pontiac G8 GT

    I know Myth busters did a thing, that proved it Does NOT effect gas milelage, as far as performance, I dont know.

    It is actually worse to drive with the windows down, for gas mileage due to air resistance, I would assume same would ring true for performance,


    But with windows up and AC off, / Vs. windows up ac ON. I DON'T KNOW, but I too would like to know, and like to see proof.

  3. #3
    Senior Member
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    Pretty sure the PCM turns off the AC clutch at WOT. If you're just talking about cruising at 80 yeah, it takes away some HP.

  4. #4
    Member TACE02's Avatar
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    ASC #753
    2002 Collector's Edition

    Would have to agree, PCM turns off A/C at WOT. took me a few times to realize this as I occassionally forgot to turn off A/C while running and it got a little warm in my car while running then when I got off of it the A/C kicked back on...

  5. #5
    Junior Member
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    mythbusters revisted the ac thing and it turns out that driving with the Ac doesnt hurt ur gas mileage at about 15%

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