Removing A/C... Horsepower gain?
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This is a discussion on Removing A/C... Horsepower gain? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Hey guys quick question. My A/C belt snapped off. Car is still running fine without the belt. If I remove ...

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    Registered User TurboWill's Avatar
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    Removing A/C... Horsepower gain?

    Hey guys quick question. My A/C belt snapped off. Car is still running fine without the belt. If I remove the A/C unit will I have a power gain?
    2009 wrx Dark grey metallic

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    He simply abides. SD_GR's Avatar
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    No, since there is no loss to the engine now without the belt.

    You could do a series of dyno pulls with the belt and without to figure out how much a functional A/C system "costs" in terms of power with the A/C off. Or you could just forget about it since you have a road car in NY and will need A/C both in summer and in winter (the A/C is used when "defrost" is selected whether you push the button on or not, to dehumidify the air).

    I'd replace the belt with an authentic Subaru belt, having made sure there is no underlying reason to cause it to snap. All this IMO.

    Note that the A/C is off when under full throttle, also independently of what the button is doing.
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    Registered User lytlec's Avatar
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    Did not know it turned off when full throttle...
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    OMG WTF MainFrame's Avatar
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    Yep, WOT switches the A/C off.. and without the engine driving the belt there will be no difference in power, it's already as if the A/C isn't there.

    The entire A/C system as a whole isn't light though, so removing everything A/C related should improve ALL performance aspects of the car to some degree.

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    Registered User TurboWill's Avatar
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    Thanks guys. Im running a Perrin pulley. Anyone use this?
    2009 wrx Dark grey metallic

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    I'm running the Perrin pulley too. I half assed it and didn't properly install the Ac belt. Big mistake. Lasted 3 days and snapped right off and check engine light turned on, traction, and cruise are flashing! I just replaced with oem subaru belt and reset ECU gonna see what happens.

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