Switch off the a/c when you do some aggressive driving?

FVM3 · 05-30-2013, 03:56 PM

Heard that it will hurt the a/c pump if you leave it on when driving WOT

Alex07M3 · 05-30-2013, 04:01 PM

The a/c disengaged when you go WOT on our cars so I guess no need to worry about the pump! Pretty cool feature I think!!

Hyperjack · 05-30-2013, 04:04 PM

what does "WOT" stand for?

1MOREMOD · 05-30-2013, 04:06 PM

Quote:

Originally Posted by Hyperjack

what does "WOT" stand for?

Wide Open Throttle. Thoight it was the alternator that disengages not ac.

Z K · 05-30-2013, 04:07 PM

Quote:

Originally Posted by Hyperjack

what does "WOT" stand for?

Wide Open Throttle

FVM3 · 05-30-2013, 04:10 PM

Quote:

Originally Posted by Alex07M3

The a/c disengaged when you go WOT on our cars so I guess no need to worry about the pump! Pretty cool feature I think!!

I never switch on the a/c when doing aggressive drive. You mean the a/c will be switched off when Im doing aggressive drive?

Hyperjack · 05-30-2013, 04:14 PM

Quote:

Originally Posted by 1MOREMOD

Wide Open Throttle. Thoight it was the alternator that disengages not ac.

Quote:

Originally Posted by Z K

Wide Open Throttle

thanks, guys!

Quote:

Originally Posted by Alex07M3

The a/c disengaged when you go WOT on our cars so I guess no need to worry about the pump! Pretty cool feature I think!!

if that is the case, then i agree, that is pretty cool

Alex07M3 · 05-30-2013, 06:29 PM

Quote:

Originally Posted by FVM3

Quote:

Originally Posted by Alex07M3

The a/c disengaged when you go WOT on our cars so I guess no need to worry about the pump! Pretty cool feature I think!!

I never switch on the a/c when doing aggressive drive. You mean the a/c will be switched off when Im doing aggressive drive?

I think it's only when you go WOT!

flagger · 05-30-2013, 06:39 PM

Air conditioning compressor disengaging momentarily is a common feature on low powered cars when the driver accelerates hard. It has been around for many years. Older compressors were not efficient and produced a considerable amount of drag on the motor. Newer ones are much more efficient but the feature has been carried forward

M4Now! · 05-30-2013, 06:40 PM

Most cars will disengage the A/C at WOT. And the M3 alternator only engages when the car isn't accelerating (definitely when it's coasting, there appears to be debate on whether it's on at steady speed).

Cheers

FVM3 · 05-30-2013, 07:05 PM

Quote:

Originally Posted by M3Now!

Most cars will disengage the A/C at WOT. And the M3 alternator only engages when the car isn't accelerating (definitely when it's coasting, there appears to be debate on whether it's on at steady speed).

Cheers

Noob on this and what you mean is when i accelerate hard, no a/c at all?

S65V8 · 05-30-2013, 07:21 PM

Being a little ol' skool, I switch it off when I'm about to drive hard (redline every gear). Sometimes I forget though...

FogCityM3 · 05-30-2013, 07:23 PM

According to the M school, the A/C/compressor disengages at 80% of WOT. Instructors said it was okay to drive with A/C on at WOT. After a few laps you could totally tell the A/C was not working. Unlike most tracks, BMW M School requires windows up so you can hear the radios.

CanAutM3 · 05-30-2013, 07:39 PM

I am not sure it fully disengages all the time.

While driving on the track I usually turn it off. However, on two occasions, I forgot to turn the A/C off, the car overheated and went into limp mode. After turning the A/C off and doing a cool down lap, everything went back to normal. This never happened with the A/C off.

My guess is that the priority is to maintain the cabin temperature. So if the compressor does disengage, I think it would only do so for quick WOT acceleration bursts. However with prolonged WOT, as with driving on a track, the compressor would re-engage to maintain cabin cooling. Just guessing here...

TTO898 · 05-30-2013, 07:50 PM

Yep. "A/C Off" (aka "Turbo On")

lsmkr01 · 05-30-2013, 08:40 PM

Never knew about the alternator auto disengaging on WOT. Learn something new everyday. I never have my AC on during aggressive driving so I never had to think about it.

CanAutM3 · 05-30-2013, 09:10 PM

Would be a cool feature to have the ability to program the A/C setting (on/off) in the M-button settings

.

tjsabec · 05-30-2013, 10:14 PM

I have had my M3 for 2.5 years and I have never run the AC. I hate air conditioning.

Vic311 · 05-30-2013, 10:21 PM

Quote:

Originally Posted by tjsabec

I have had my M3 for 2.5 years and I have never run the AC. I hate air conditioning.

That's actually bad for the seals. You should run it every so often to keep the seals fresh.

I'm not a fan of AC either.

alee0729 · 05-30-2013, 10:49 PM

If it's not 60 degrees in my car, I'm not happy. AC is the bees knees.

mdosu · 05-31-2013, 12:50 AM

Quote:

Originally Posted by SROC5

Being a little ol' skool, I switch it off when I'm about to drive hard (redline every gear). Sometimes I forget though...

Me too

Titanium Silver · 05-31-2013, 01:56 AM

Whenever I am going to drive fast, I turn off the AC. Regardless if the AC is on at WOT (or 80% of WOT), the car drives much more sluggish in general with the AC on. I seem to notice this on most cars.

05-30-2013, 03:56 PM	#1
FVM3 Major General 273 Rep 5,751 Posts Drives: e92 m3, f30 328i Join Date: Sep 2010 Location: Los Angeles iTrader: (2)	Switch off the a/c when you do some aggressive driving? Heard that it will hurt the a/c pump if you leave it on when driving WOT
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05-30-2013, 04:01 PM	#2
Alex07M3 Banned 82 Rep 2,688 Posts Drives: E92 M3, Evo X MR, A4 Allroad Join Date: Jan 2012 Location: Gatineau iTrader: (1)	The a/c disengaged when you go WOT on our cars so I guess no need to worry about the pump! Pretty cool feature I think!!
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05-30-2013, 04:04 PM	#3
Hyperjack Captain 44 Rep 790 Posts Drives: 2013 M3 E92/ 2012 Chevy Volt Join Date: Mar 2013 Location: California iTrader: (0)	what does "WOT" stand for?
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05-30-2013, 06:39 PM	#9
flagger Private First Class 18 Rep 150 Posts Drives: E92 M3 Join Date: Mar 2008 Location: West Virginia iTrader: (0)	Air conditioning compressor disengaging momentarily is a common feature on low powered cars when the driver accelerates hard. It has been around for many years. Older compressors were not efficient and produced a considerable amount of drag on the motor. Newer ones are much more efficient but the feature has been carried forward
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05-30-2013, 06:40 PM	#10
M4Now! Captain 292 Rep 708 Posts Drives: MG / SO F83 Join Date: Sep 2011 Location: Texas iTrader: (0)	Most cars will disengage the A/C at WOT. And the M3 alternator only engages when the car isn't accelerating (definitely when it's coasting, there appears to be debate on whether it's on at steady speed). Cheers __________________ Bye bye E93 M3 - Hello F83 M4!
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05-30-2013, 07:21 PM	#12
S65V8 _ 812 Rep 3,160 Posts Drives: ... Join Date: Apr 2009 Location: Los Angeles, CA iTrader: (10)	Being a little ol' skool, I switch it off when I'm about to drive hard (redline every gear). Sometimes I forget though...
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05-30-2013, 07:23 PM	#13
FogCityM3 Colonel 500 Rep 2,400 Posts Drives: M3 (E90) & Porsche GT3 RS Join Date: Feb 2012 Location: San Francisco iTrader: (0)	According to the M school, the A/C/compressor disengages at 80% of WOT. Instructors said it was okay to drive with A/C on at WOT. After a few laps you could totally tell the A/C was not working. Unlike most tracks, BMW M School requires windows up so you can hear the radios. Last edited by FogCityM3; 05-30-2013 at 08:20 PM..
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05-30-2013, 07:39 PM	#14
CanAutM3 General 21131 Rep 20,742 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	I am not sure it fully disengages all the time. While driving on the track I usually turn it off. However, on two occasions, I forgot to turn the A/C off, the car overheated and went into limp mode. After turning the A/C off and doing a cool down lap, everything went back to normal. This never happened with the A/C off. My guess is that the priority is to maintain the cabin temperature. So if the compressor does disengage, I think it would only do so for quick WOT acceleration bursts. However with prolonged WOT, as with driving on a track, the compressor would re-engage to maintain cabin cooling. Just guessing here... Last edited by CanAutM3; 05-30-2013 at 08:05 PM..
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05-30-2013, 07:50 PM	#15
TTO898 Second Lieutenant 61 Rep 288 Posts Drives: 2013 M5 (F10) Join Date: May 2012 Location: Atlanta GA iTrader: (1)	Yep. "A/C Off" (aka "Turbo On") __________________ ________________________________ 2013 M5 \| Black Sapphire/Black 2015 X5 xDrive50i \| Black Sapphire/Black \| M Sport Gone: 2016 M3, 2013 M3 Conv, 2000 M Roadster, 2010 X5, 2013 X5, 2008 5 Series
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05-30-2013, 08:40 PM	#16
lsmkr01 Lieutenant Colonel 42 Rep 1,629 Posts Drives: E92 M3 Join Date: Feb 2007 Location: SC iTrader: (0)	Never knew about the alternator auto disengaging on WOT. Learn something new everyday. I never have my AC on during aggressive driving so I never had to think about it.
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05-30-2013, 09:10 PM	#17
CanAutM3 General 21131 Rep 20,742 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	Would be a cool feature to have the ability to program the A/C setting (on/off) in the M-button settings .
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05-30-2013, 10:14 PM	#18
tjsabec Captain 53 Rep 620 Posts Drives: 2008, e90, alpine white, 6mt Join Date: Aug 2011 Location: Morgantown, wv iTrader: (2)	I have had my M3 for 2.5 years and I have never run the AC. I hate air conditioning.
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05-30-2013, 10:49 PM	#20
alee0729 Lieutenant 175 Rep 586 Posts Drives: 2013 E92 M3, 2018 Tesla 3 Perf Join Date: Mar 2013 Location: New York, NY iTrader: (0)	If it's not 60 degrees in my car, I'm not happy. AC is the bees knees. __________________ 2013 E92 M3 (the weekend good weather car), 2018 Tesla Model 3 Performance (the 20k mi/yr beater)
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05-31-2013, 01:56 AM	#22
Titanium Silver Four Star General 13 Rep 597 Posts Drives: E92 M3 Join Date: Jun 2011 Location: USA iTrader: (0)	Whenever I am going to drive fast, I turn off the AC. Regardless if the AC is on at WOT (or 80% of WOT), the car drives much more sluggish in general with the AC on. I seem to notice this on most cars. __________________ E92 M3 \| Jet Black \| All OEM Everything E30 M3 \| Alpine White \| Mostly OEM
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