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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-01-2010, 11:52 AM   #1
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AC is affecting my....

So I just ran my AC for the first time today and it felt like it really hurt my engines power. I have only had the car a month and this is the first BMW I have owned and was wondering is this normal? I searched but didn't find much

Last edited by BeeMDubYa330i; 04-01-2010 at 12:00 PM.
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Old 06-28-2010, 07:55 AM   #2
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Probably the camshift is weak. May be... try to diagnos your car.
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Old 07-01-2010, 07:13 AM   #3
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its normal.. you rpm meter will olso be hire.
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Old 07-01-2010, 07:44 AM   #4
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Originally Posted by BeeMDubYa330i View Post
So I just ran my AC for the first time today and it felt like it really hurt my engines power. I have only had the car a month and this is the first BMW I have owned and was wondering is this normal? I searched but didn't find much
Having the A/C kick on and be quite noticeable is normal. You have a 330 though, imagine a 323...

If you have a manual transmission, you'll notice your shifting will also be affected. The rpms will drop more quickly between shifts, meaning you'll either have to make the gear change more quickly or give a throttle blip to make the engagement smooth. This is at least my experience with a 323, you may experience this to a lesser extend on the 330.
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Old 07-02-2010, 11:43 PM   #5
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it's there in a 330 as well, dammit
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Old 07-03-2010, 10:44 PM   #6
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I dont notice it. I did in my 1989 civic though.
AST 4100s, plates & s-RSMs | Eibach sways | OEM brace | CSL rack | CSL rotors & calipers w/ ST lines | Genuine CSLs w/ BBS caps
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Old 07-04-2010, 08:27 AM   #7
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I recently saw a dyno test on how much accessories affect power. In a 114hp car, AC peeled off 10whp.
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Old 07-04-2010, 08:33 AM   #8
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Actually only 8% loss due to AC is quite good!! I've seen more like 15% on many vehicles. Definitely notice the difference when it's on, so use as infrequently as possible.....
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Old 07-04-2010, 08:20 PM   #9
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Aren't those Pullies that UUC and Rogue sell suppose to help with AC power loss?

Originally Posted by PEI330Ci View Post
Oh...and the "$300 here, $600 there" scenario will turn into "$3000 here, $6000 there". I've had an enourmous amount of labor put into my car. (Luckily the majority of it was done by myself) Also, I've spent over $5k on my tool set since I started my project. You've been warned...
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