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Thread: Just Curious about AC power loss

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    Default Just Curious about AC power loss

    Does anyone really know on average how much hp/trq loss you have when you turn on your AC?

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    Most A/C compressor's cut out at higher RPM to eliminate any drain under heavy acceleration. Most people think it draws hp, when really it doesen't.
    Originally posted by rice_eater
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    Most air conditioners in cars use about 1-1.3 hp per ton of refrigeration, and most cars have about 2 tons of a/c, some of the bigger vehicles, trucks vans , old caddy's etc had upt 5 tons of a/c, so just average out at about a 3-4 hp loss on most cars, and 5-6 hp for trucks and larger cars. It really gives you an idea of how much effect 4 or so hp has on the way a car feels, or how some really gutless some cars are, I remember driving a rented sunfire to winnipeg, the difference between climbing a hill at a reasonable speed and barely making a hill was whether the a/c was on or not, and being thats its hp loss at the flywheel end its probably like losing 10 hp at the wheels...max
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    id say its got to be at least 10 since its very noticeable on small engines when a/c is on. auto ELs top out at 140 with the a/c on

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    my sti loses 15 at the wheels, dyno tested.

    i was surprised!

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    just dont turn it on when you want the power. it uses no power when its off and the only area you loosing is that the car may be 50lbs heavier which is negligable on the street.

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    either citreon or peugeot developed an AC kit for their rally cars that only used 2 hp. i cant remember which one made it but it would be nice to see them hit the roads sometime soon.


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    I think of it like a turbo: I drive around with the AC on all the time and when I pull up to a vette or something that wants to race I hit the off button (its like turning the turbos on) and I instantly gain like 50hp and I rape the vette or viper or whatever tries to race me. They never know what hit them....
































    But seriously, its pretty surprising how much power my car loses when the AC is on. I can still climb hills in 6th gear sometimes on the highway but you can defenitaly feel the drain when it is on. There was actually a guy on the Acura Legend forums that took the AC compressor out of his car to gain a few horse from the weight loss (what a tool).
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    I have a small disp turbo car, so launching at a light with the AC on is hugely noticable compared to having it off. I would rather have 2 200 pound people in the back than my ac on if stuck at a light.

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    yeah it would be interesting to see exactly how much of a loss it is in my car. its so noticeable. if i'm accelerating with it on and i turn it off it feels like a big load was taken off. i rarely use AC though.
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    I'm planning on removing mine.
    Not so much for weight, but for better airflow over intercooler (a/c rad covering currently)
    Plus Its A t-top car In Canada, when Do i Need air conditioning?

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    I think I'm gonna try at Secret Street and see what kind of difference it makes,... mind you I have a 3.1 V6

    It would be neat to see what the differences are in the 1/4 times,.... I've raced the last 2 weeks, and I average 16.9, depending on my launch, and reaction time.
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    just go on a highway and start off driving with your A/C on, after a bit, turn your A/C off, you'll be suprised how much better the car runs, its especially noticeble on weaker cars (like my mom's CRV )

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    Its not just the power loss that the AC compressor creates though, its also the weight. When you think of the added weight of the condensor and compressor, it can be anywhere from 50lbs to 100lbs.

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    Originally posted by googe
    my sti loses 15 at the wheels, dyno tested.

    i was surprised!

    where were you able to dyno your sti!? please let me know thanks! Don't tell me u only dynoed 2 wheels!

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    Originally posted by vincent-h



    where were you able to dyno your sti!? please let me know thanks! Don't tell me u only dynoed 2 wheels!
    oops, guess that is misleading
    someone else did the dyno run, not from around here. they posted the results. the statement "my sti" is accurate under the assumption that my car also has similar results, since its the same car

    no awd dynos anywhere remotely close to here. i think the nearest is in washington.

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    haha damn i thought u either wrecked ur car on a 2wheel dyno or you completely raised my hopes haha
    -Vincent

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    Originally posted by Scat
    Its not just the power loss that the AC compressor creates though, its also the weight. When you think of the added weight of the condensor and compressor, it can be anywhere from 50lbs to 100lbs.
    it shouldnt weigh any more than 50lbs cuz the condensor is pretty small and the compressor is small too. yes, 50lbs counts, but removing a/c is a lot of work for 50lbs.

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    Originally posted by GTS Jeff
    it shouldnt weigh any more than 50lbs cuz the condensor is pretty small and the compressor is small too. yes, 50lbs counts, but removing a/c is a lot of work for 50lbs.
    But on a front engine car with a front weight bias, removing the AC components removes some of this weight from the front wheels, therefore allowing the car to have a weight distribution closer to 50/50.

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    Originally posted by Scat


    But on a front engine car with a front weight bias, removing the AC components removes some of this weight from the front wheels, therefore allowing the car to have a weight distribution closer to 50/50.
    which would make like a 2% difference if u are lucky. lets say it takes u 8 hours to remove a/c. u could spend that 8 hours working at a $20/hr job to make $160, which u could spend on something like say a stb. which would make a bigger difference than removing a/c!

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