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Old 08-23-2014, 04:30 PM   #1
disturbinglee
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AC pulling tons of power?...

Hey guys, i know that having your ac on does affect performance but with my car it seems to make a Huge difference. I have an 03 zx3 and i wasn't sure if this was normal or not. I try to drive without ac bc it drivers better and makes a huge difference with milage but its hot in FL so I can't always do that. Basically just seeing if this was normal or not and if it isn't if you guys have any suggestions. thanks!


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Old 08-23-2014, 04:47 PM   #2
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On a small engine wrapped in a light car the AC compressor will make a noticeable impact driving. It is rather annoying.
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Old 08-23-2014, 05:21 PM   #3
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Quote:
Originally Posted by gotta_gofast View Post
On a small engine wrapped in a light car the AC compressor will make a noticeable impact driving. It is rather annoying.
Thanks, I figured but I was just checking to make sure
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Old 08-23-2014, 05:48 PM   #4
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Things that help this a good bit is a tune , 180 deg thermostat , doing this with a Tune can turn on the fans sooner and keeps the engine cooler , this makes for more performance and by having the fans on cooler it lowers the head psi in the compressor and makes turning the compressor easier meaning takes less HP from the engine to run the AC

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Old 08-24-2014, 11:50 PM   #5
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I can feel my A/C compressor kick in and out even when just cruising at a constant speed and RPM. Just the nature of a low-power engine getting hit with a big power draw.
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Old 08-25-2014, 07:53 AM   #6
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Yep, I was cursing mine today. They are dead with hot day and mileage over 125K. The ring seal has dropped enough by then to show effect. A brand new engine will motor right through that condition.

I was wondering today based on the response of the engine to throttle if there wasn't more a tune might do since the throttle gets opened up a bunch but nothing really happens. Get deeper though into it to hit the open loop and at a very small bit more of throttle boy it comes on then, like a turbo just kicked in. It has something to do with still trying to run at stoichiometric at lower load.
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Old 08-25-2014, 08:58 AM   #7
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A tune and 180 helps a LOT

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Old 08-30-2014, 12:30 PM   #8
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I could see that happening there. Something is wonky when you can open the throttle 15-20 degrees and literally nothing happens. I realize the a/c steals power but the engine simply does not go with more throttle until you get way deep in it, then it suddenly DOES do right. That ain't right, something there in software that is correct with fresh motor is not once it gets old and less ring seal. Probably too hot and too lean for emissions, get richer and colder and boom! It goes then.
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Old 11-30-2014, 12:37 PM   #9
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some of the ac clutches have a washer behind them, but you can remove it when the clutch gets worn down.. doesnt hit as hard when it cycles.
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Old 12-13-2014, 10:03 PM   #10
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if you have an A/C system leak it can cause the compressor to bog down the engine
i have a fitting leak and cant keep R134a in my car more then a month
then my engine wants to practically die with the AC on
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