My exhaust is louder when it's raining :/

BentZero · 09-27-2016, 11:37 AM

I have a Fabspeed valvetronic exhaust. I keep thinking that this is all in my head, but it seems like my exhaust sounds deeper and vibrates the cabin a bit more when it's raining. I think it has to do with water being on the exhaust pipe that runs under the car. I say that because it has to be raining a decent amount. If it's just sprinkling I don't notice it.

Anyone else notice the same thing or is this really just in my head?

overcoil · 09-27-2016, 12:04 PM

I noticed the other day that it seems in cooler weather the stock 235 is louder at start up as it falls into idle.

Xenny · 09-27-2016, 02:05 PM

Quote:

Originally Posted by BentZero

I have a Fabspeed valvetronic exhaust. I keep thinking that this is all in my head, but it seems like my exhaust sounds deeper and vibrates the cabin a bit more when it's raining. I think it has to do with water being on the exhaust pipe that runs under the car. I say that because it has to be raining a decent amount. If it's just sprinkling I don't notice it.

Anyone else notice the same thing or is this really just in my head?

cold water on certain sections of hot pipe, while other sections stay dry/hot, can cause some weird distortions overall. tough to troubleshoot exactly whats happening though.

for example: http://www.audizine.com/forum/showth...cator%20blocks

Fabspeed Motorsport · 09-27-2016, 02:20 PM

Xenny is correct. There isn't much you can do to avoid it. It's a combination of a ton of different factors, not just in your head.

BentZero · 09-27-2016, 03:28 PM

Quote:

Originally Posted by Fabspeed Motorsport

Xenny is correct. There isn't much you can do to avoid it. It's a combination of a ton of different factors, not just in your head.

Haha, there is something I can do. Install water injection.

I actually like how it sounds. I just wasn't sure if I was imagining things.

XutvJet · 09-28-2016, 10:54 AM

Humidity tends to make exhausts a bit louder. It's science.

Jeff@TopGearSolutions · 10-06-2016, 10:48 AM

I believe it. On one of my other cars when it rained my Sway bar would hit my exhaust LOL

Metal expanding at a different rate and stuff is what I attributed it too.

Anthony235 · 10-06-2016, 03:22 PM

Think some of you are reading too much into this lol..

Maybe when it's not raining you have the windows down and when it's raining you have the windows up.

Windows up and the cabin noise is amplified.

Xenny · 10-06-2016, 04:07 PM

Quote:

Originally Posted by Anthony235

Think some of you are reading too much into this lol..

Maybe when it's not raining you have the windows down and when it's raining you have the windows up.

Windows up and the cabin noise is amplified.

nice one!

it's also probably because people drive slower in the rain. slower speed = less rpms = less noise!

BentZero · 10-06-2016, 05:43 PM

Quote:

Originally Posted by Anthony235

Think some of you are reading too much into this lol..

Maybe when it's not raining you have the windows down and when it's raining you have the windows up.

Windows up and the cabin noise is amplified.

Lol, nope. Summers here are brutal. Couldn't ride around with windows down for a span of about a month. It sucked.

crbalch · 10-10-2016, 02:25 PM

This is absolutely a thing. Happened with my AWE which is why I ultimately returned it. When it rained it got significantly louder with a lot more drone.

09-27-2016, 11:37 AM	#1
BentZero Lieutenant Colonel 625 Rep 1,753 Posts Drives: 6MT Mineral White M235i Join Date: Oct 2015 Location: Charleston, SC iTrader: (2)	My exhaust is louder when it's raining :/ I have a Fabspeed valvetronic exhaust. I keep thinking that this is all in my head, but it seems like my exhaust sounds deeper and vibrates the cabin a bit more when it's raining. I think it has to do with water being on the exhaust pipe that runs under the car. I say that because it has to be raining a decent amount. If it's just sprinkling I don't notice it. Anyone else notice the same thing or is this really just in my head? __________________ I rev-match from neutral to first 6MT Mineral White on black M235i coupe Build thread
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09-27-2016, 12:04 PM	#2
overcoil Major General 3074 Rep 5,577 Posts Drives: M235i 6spd Join Date: Dec 2013 Location: Mid-Atlantic iTrader: (0)	I noticed the other day that it seems in cooler weather the stock 235 is louder at start up as it falls into idle. Last edited by overcoil; 09-27-2016 at 03:23 PM..
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09-27-2016, 02:20 PM	#4
Fabspeed Motorsport 1006 Rep 1,653 Posts Drives: BMW M235i Join Date: May 2015 Location: Fort Washington, PA iTrader: (0)	Xenny is correct. There isn't much you can do to avoid it. It's a combination of a ton of different factors, not just in your head.
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09-28-2016, 10:54 AM	#6
XutvJet Major General 5554 Rep 5,372 Posts Drives: 2011 Cayman Base, 2016 M235 Join Date: Mar 2016 Location: Kansas City iTrader: (-1)	Humidity tends to make exhausts a bit louder. It's science.
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10-06-2016, 10:48 AM	#7
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	I believe it. On one of my other cars when it rained my Sway bar would hit my exhaust LOL Metal expanding at a different rate and stuff is what I attributed it too.
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10-06-2016, 03:22 PM	#8
Anthony235 Lieutenant Colonel 715 Rep 1,541 Posts Drives: m235i Join Date: Feb 2016 Location: OC, Ca iTrader: (2) Garage List 2015 BMW [0.00]	Think some of you are reading too much into this lol.. Maybe when it's not raining you have the windows down and when it's raining you have the windows up. Windows up and the cabin noise is amplified. __________________ For Sale: SoCal: Sportline 8s 18x8.5 (2) For Sale: OEM wheels and exterior bits
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10-10-2016, 02:25 PM	#11
crbalch The Schwab 473 Rep 1,605 Posts Drives: 2020 AW M340xi Join Date: Jun 2011 Location: Chicagoland iTrader: (2) Garage List 2017 BMW X1 [0.00] 2016 BMW M235xi [0.00]	This is absolutely a thing. Happened with my AWE which is why I ultimately returned it. When it rained it got significantly louder with a lot more drone.
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