Afe exhaust whistle?

135rampo · 04-29-2015, 05:52 PM

Any one noticed a exhaust whistle?
Think it's to do with the tips is there any way to stop it?

Solo_M_Tech · 04-30-2015, 03:12 AM

Mine does it. I'd like to know as well

e92ben · 04-30-2015, 07:46 AM

Check your bolts tighten everything down. Maybe your gaskets. Whistle is usually a leak.

135rampo · 04-30-2015, 08:06 AM

Quote:

Originally Posted by e92ben

Check your bolts tighten everything down. Maybe your gaskets. Whistle is usually a leak.

ive literally only just fitted it all spring bolted up tight

Swear i read somewhere its to do with the tips

e92ben · 04-30-2015, 08:07 AM

Quote:

Originally Posted by 135rampo

Quote:

Originally Posted by e92ben

Check your bolts tighten everything down. Maybe your gaskets. Whistle is usually a leak.

ive literally only just fitted it all spring bolted up tight

Swear i read somewhere its to do with the tips

How loud is the whistle sound? You sure it's not the slight faint sound of your turbo lol

Kgolf31 · 04-30-2015, 08:21 AM

Quote:

Originally Posted by 135rampo

ive literally only just fitted it all spring bolted up tight

Swear i read somewhere its to do with the tips

Most likely is.

If the dia of the exhaust tips is too small, you'll increase the velocity of the exhaust gas and cause a resonance.

135rampo · 04-30-2015, 09:10 AM

Quote:

Originally Posted by e92ben

How loud is the whistle sound? You sure it's not the slight faint sound of your turbo lol

no its more like a horn sort of sound lol i know what a turbo sounds like

ShocknAwe · 04-30-2015, 09:31 AM

It's the tips. All of the exhausts that have an unmuffled split to two tips near the rear of the car have a pretty big chance of whistling a little at WOT on our cars.

Ultimateone · 04-30-2015, 09:45 AM

Quote:

Originally Posted by 135rampo

no its more like a horn sort of sound lol i know what a turbo sounds like

I think the same thing was happening to the Berks too, even some videos of it.. wonder if it's the same design flaw

edit: Shock got it

rac · 05-03-2015, 09:04 PM

i had/have this issue. I blocked one pipe and the whistle got worse, its actually a half throttle whistle for me. Just finished installing an m-factory LSD and the whistle is now much less. main difference is when the exhaust was re-installed the slip joint b/w mid-section and axle back is in a slightly different position. made a big difference, both cases it was leak tight.

i read on another forum someone saying that slip joints can cause exhaust whistle. I would say any abrupt pipe ends within the muffler or just prior is cable of this particularly on a straight through exhaust. some of the finish within mufflers is pretty poor. nice and shiny welds on the outside, sh888y exposed pipe ends on the inside.

r.

GrizzNazzty · 05-05-2015, 07:24 AM

Does it sound like this?

LYCANtreo · 05-05-2015, 07:33 AM

Funny as hell!!!

04-29-2015, 05:52 PM	#1
135rampo Private 10 Rep 58 Posts Drives: focus rs mk2 Join Date: Jun 2014 Location: essex iTrader: (0)	Afe exhaust whistle? Any one noticed a exhaust whistle? Think it's to do with the tips is there any way to stop it?
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04-30-2015, 03:12 AM	#2
Solo_M_Tech Brigadier General 1688 Rep 3,140 Posts Drives: 2014 M5 6MT Join Date: Nov 2013 Location: Massachusetts iTrader: (7) Garage List 2014 BMW M5 [0.00]	Mine does it. I'd like to know as well __________________ 2014 M5 6MT
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04-30-2015, 07:46 AM	#3
e92ben Brigadier General 1053 Rep 3,205 Posts Drives: BMW M3 BMW 635csi Join Date: Jul 2011 Location: Kenosha Wi iTrader: (7)	Check your bolts tighten everything down. Maybe your gaskets. Whistle is usually a leak. __________________ e92 ///M3
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04-30-2015, 09:31 AM	#8
ShocknAwe 1Addict 3233 Rep 7,893 Posts Drives: E82 Mutt, M57 Truck Join Date: Jul 2012 Location: Charleston iTrader: (22)	It's the tips. All of the exhausts that have an unmuffled split to two tips near the rear of the car have a pretty big chance of whistling a little at WOT on our cars. __________________ 2010 135i 6MT Jet Black N54/3 FE82 Mutt \| BUILD THREAD \| GARAGE SALE
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05-03-2015, 09:04 PM	#10
rac Private First Class 27 Rep 128 Posts Drives: 2008 135i 6MT Join Date: Mar 2014 Location: Perth, Australia iTrader: (0)	i had/have this issue. I blocked one pipe and the whistle got worse, its actually a half throttle whistle for me. Just finished installing an m-factory LSD and the whistle is now much less. main difference is when the exhaust was re-installed the slip joint b/w mid-section and axle back is in a slightly different position. made a big difference, both cases it was leak tight. i read on another forum someone saying that slip joints can cause exhaust whistle. I would say any abrupt pipe ends within the muffler or just prior is cable of this particularly on a straight through exhaust. some of the finish within mufflers is pretty poor. nice and shiny welds on the outside, sh888y exposed pipe ends on the inside. r.
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05-05-2015, 07:24 AM	#11
GrizzNazzty Private First Class 11 Rep 148 Posts Drives: 2008 135i Join Date: Apr 2014 Location: NY iTrader: (0)	Does it sound like this? __________________ E82 AW /ATM FMIC/VRSF DP/ER CP/TialQ/CobbV2/Koni Yellow/M3 Sway Bar/Roc Euro DCI/Berk Street/
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05-05-2015, 07:33 AM	#12
LYCANtreo Private First Class 25 Rep 305 Posts Drives: LYCAN 09 AW 135i M Sport Join Date: Jun 2013 Location: New York iTrader: (2)	Funny as hell!!! __________________ AW '09 135i M package \| aFe Intake \| aFe Axle Back \| aFe Throttle Body Spacer \| Vishnu Procede 2.5 \| Alpina B3 Flash \| BMS Cowl Filters \| Matte Black Kidneys \| AA Charge Pipe \| Tial BOV\| VRSF DP's \|M3/1M Front Control Arm Upgrade Kit \|
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