Exhaust louder if A/C is on

D CHOI · 06-09-2019, 04:16 PM

I just have fabspeed downpipe with Stock tune. I usually don't turn on the A/C as I prefer to drive with windows down. As some of you may noticed our cars can sound different depending on how the weather is. On some days it doesn't sound as loud and pure. During colder and more humid days it will be louder. One thing I realized lately is if you have the A/C on it makes it sound louder and more pronounced especially the pops and burbles.

Does anyone have an idea why this is exactly?

DanG · 06-09-2019, 04:34 PM

I think you are listening to ASD not real exhaust sounds.

D CHOI · 06-09-2019, 04:50 PM

Quote:

Originally Posted by DanG

I think you are listening to ASD not real exhaust sounds.

I have ASD coded off and I've had the car for over 2 years now. I hear exhaust changes tone a decent amount and it's more noticeable during pops bangs and farts when u let off throttle.

If you live in a humid climate then I would say the sound may not affect you as much. But living in the desert it's more noticeable.

DanG · 06-09-2019, 05:02 PM

Quote:

Originally Posted by D CHOI

I have ASD coded off and I've had the car for over 2 years now. I hear exhaust changes tone a decent amount and it's more noticeable during pops bangs and farts when u let off throttle.

If you live in a humid climate then I would say the sound may not affect you as much. But living in the desert it's more noticeable.

Seattle does have a much higher humidity. I also have ASD bypassed. But I don’t notice much difference in sounds with weather changes.

D CHOI · 06-09-2019, 05:05 PM

Quote:

Originally Posted by DanG

Quote:

Originally Posted by D CHOI

I have ASD coded off and I've had the car for over 2 years now. I hear exhaust changes tone a decent amount and it's more noticeable during pops bangs and farts when u let off throttle.

If you live in a humid climate then I would say the sound may not affect you as much. But living in the desert it's more noticeable.

Seattle does have a much higher humidity. I also have ASD bypassed. But I don’t notice much difference in sounds with weather changes.

That seems reasonable. Whenever I'm in socal the car will naturally sound and perform better. It also helps that elevation is lower too compared to in Vegas.

heavyD^2 · 06-10-2019, 01:09 PM

This is normal as with the A/C compressor engaged your engine is under more load. This is why they turn off A/C when trying to accomplish best times around a track.

Anthony1s · 06-10-2019, 10:03 PM

Last 3 cars I owned did the same thing. Probably my previous ones too just didn't notice it cause they didn't have upgraded exhausts. I think it's additional rpm needed to run the condenser.

qnet · 06-12-2019, 11:41 PM

Yeah, it's just the extra load. I really notice it on my car with the MPE from the outside. I also have ASD coded off.

06-09-2019, 04:16 PM	#1
D CHOI Captain 581 Rep 844 Posts Drives: 2017 BMW M2 Join Date: Sep 2016 Location: Las Vegas iTrader: (0)	Exhaust louder if A/C is on I just have fabspeed downpipe with Stock tune. I usually don't turn on the A/C as I prefer to drive with windows down. As some of you may noticed our cars can sound different depending on how the weather is. On some days it doesn't sound as loud and pure. During colder and more humid days it will be louder. One thing I realized lately is if you have the A/C on it makes it sound louder and more pronounced especially the pops and burbles. Does anyone have an idea why this is exactly?
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06-09-2019, 04:34 PM	#2
DanG Major General 10583 Rep 6,920 Posts Drives: 2018 M2 AW DCT Join Date: Aug 2012 Location: Seattle, WA iTrader: (1) Garage List 2018 BMW M2 [7.68]	I think you are listening to ASD not real exhaust sounds.
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06-10-2019, 01:09 PM	#6
heavyD^2 Colonel 3689 Rep 2,956 Posts Drives: X3M Competition Join Date: Apr 2018 Location: Too close to Santa iTrader: (0)	This is normal as with the A/C compressor engaged your engine is under more load. This is why they turn off A/C when trying to accomplish best times around a track.
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06-10-2019, 10:03 PM	#7
Anthony1s Banned 756 Rep 2,149 Posts Drives: 2018 Mineral Grey M2 Join Date: Oct 2017 Location: Pennsylvania iTrader: (0)	Last 3 cars I owned did the same thing. Probably my previous ones too just didn't notice it cause they didn't have upgraded exhausts. I think it's additional rpm needed to run the condenser.
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06-12-2019, 11:41 PM	#8
qnet Major 682 Rep 1,016 Posts Drives: 18 Jeep Wrangler, 18 M2 LBB Join Date: Feb 2016 Location: Morrow GA. iTrader: (0)	Yeah, it's just the extra load. I really notice it on my car with the MPE from the outside. I also have ASD coded off.
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