MPE Whistle

jyerelek · 12-18-2018, 12:23 PM

When I first installed my M performance exhaust on my 435i, there is a distinct whistle that comes in the high RPM's of WOT. This was eliminated when I put a cat less down pipe on. However, I have taken the downpipe off and installed the factory catalytic converter back on. My question is does anyone know how to get rid of the mpe whistle?

badbread · 12-18-2018, 03:46 PM

Like this?

jyerelek · 12-18-2018, 05:58 PM

Quote:

Originally Posted by badbread

Like this?

Like this

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perryo91 · 12-18-2018, 08:11 PM

Yes! I've always wondered this! Something with the turbo I'm assuming?

ChristosD · 12-19-2018, 04:48 AM

is this whistle happening with the valve open or closed or both?

perryo91 · 12-19-2018, 09:35 AM

Never tried closed to be honest.

Most of the time when I’m past 5k rpm I’m in sport/+

BulsaraF36 · 12-19-2018, 12:26 PM

I hear it with my car during WOT. For me it wasn't noticable on stock dp but hear it more now on fabspeed sport cat dp.

1QuikWS6 · 12-20-2018, 05:40 AM

The whistle comes from the exhaust tips.

When I 1st slid my tips on & adjusted them to stick out like I wanted - the tips were not pushed back onto the pipes as far as they would go. This left a gap between the edge of the pipe & the inner flap of the tips & as the exhaust gasses blew across this gap it made the whistle sound.

Obviously the faster you go/revving the engine made the whistle even more noticeable due to exhaust gas speed

I adjusted my tips to go back further and not leave a gap & the whistle is gone

jyerelek · 12-20-2018, 10:39 AM

Quote:

Originally Posted by 1QuikWS6

The whistle comes from the exhaust tips.

When I 1st slid my tips on & adjusted them to stick out like I wanted - the tips were not pushed back onto the pipes as far as they would go. This left a gap between the edge of the pipe & the inner flap of the tips & as the exhaust gasses blew across this gap it made the whistle sound.

Obviously the faster you go/revving the engine made the whistle even more noticeable due to exhaust gas speed

I adjusted my tips to go back further and not leave a gap & the whistle is gone

I'll try this today and report back

XutvJet · 12-20-2018, 11:12 AM

The whistle is simply the freer flowing exhaust allowing you to hear more noise from the turbo. The sound you're hearing is the DME manipulating the wastegate to control boost in the upper rpms and you're hearing the exhaust hitting nearly supersonic speeds as it passes the edges wastegate flap. My M235 didn't have the whistle until I installed the MPE. The whistle also seems more prevalent in the lower gears.

jyerelek · 12-20-2018, 11:36 AM

Quote:

Originally Posted by jyerelek

Quote:

Originally Posted by 1QuikWS6

The whistle comes from the exhaust tips.

When I 1st slid my tips on & adjusted them to stick out like I wanted - the tips were not pushed back onto the pipes as far as they would go. This left a gap between the edge of the pipe & the inner flap of the tips & as the exhaust gasses blew across this gap it made the whistle sound.

Obviously the faster you go/revving the engine made the whistle even more noticeable due to exhaust gas speed

I adjusted my tips to go back further and not leave a gap & the whistle is gone

I'll try this today and report back

Whistle still exists

jyerelek · 12-20-2018, 11:40 AM

Quote:

Originally Posted by XutvJet

The whistle is simply the freer flowing exhaust allowing you to hear more noise from the turbo. The sound you're hearing is the DME manipulating the wastegate to control boost in the upper rpms and you're hearing the exhaust hitting nearly supersonic speeds as it passes the edges wastegate flap. My M235 didn't have the whistle until I installed the MPE. The whistle also seems more prevalent in the lower gears.

Is there any way to get rid of the whistle that you know of?

perryo91 · 12-20-2018, 12:21 PM

Quote:

Originally Posted by jyerelek

Whistle still exists

Damn was hoping that’d be the fix. I wonder how OP shot rid of it if he said it went away with the tip alignment

XutvJet · 12-20-2018, 01:58 PM

Quote:

Originally Posted by jyerelek

Is there any way to get rid of the whistle that you know of?

Put the stock exhaust back on

1QuikWS6 · 12-20-2018, 02:02 PM

Quote:

Originally Posted by jyerelek

Whistle still exists

IDK then, maybe we're talking about different whistle sound cause that worked for me...

I actually couldn't hear my whistle unless I was standing behind the car next to the exhaust - could not hear while in car

I don't have any turbo whistle either as mentioned & I have a Pure Stg 2 bigger turbo installed

perryo91 · 12-20-2018, 09:23 PM

Quote:

Originally Posted by 1QuikWS6

IDK then, maybe we're talking about different whistle sound cause that worked for me...

I actually couldn't hear my whistle unless I was standing behind the car next to the exhaust - could not hear while in car

I don't have any turbo whistle either as mentioned & I have a Pure Stg 2 bigger turbo installed

Yeah I think it’s a different whistle than the one in the video.

jyerelek · 12-21-2018, 09:54 AM

Quote:

Originally Posted by XutvJet

The whistle is simply the freer flowing exhaust allowing you to hear more noise from the turbo. The sound you're hearing is the DME manipulating the wastegate to control boost in the upper rpms and you're hearing the exhaust hitting nearly supersonic speeds as it passes the edges wastegate flap. My M235 didn't have the whistle until I installed the MPE. The whistle also seems more prevalent in the lower gears.

Took the car to the service center and they said it was normal and was due to the wastegate.

XutvJet · 12-21-2018, 12:08 PM

Quote:

Originally Posted by jyerelek

Took the car to the service center and they said it was normal and was due to the wastegate.

Yep. I hear it most when it's warm and humid out. My guess is it have something to do with exhaust piping being hotter and improving velocity. Some days it's really clear and others I can barely hear it. In the winter, I rarely hear it.

Dr_Glob · 12-21-2018, 05:20 PM

Quote:

Originally Posted by jyerelek

When I first installed my M performance exhaust on my 435i, there is a distinct whistle that comes in the high RPM's of WOT. This was eliminated when I put a cat less down pipe on. However, I have taken the downpipe off and installed the factory catalytic converter back on. My question is does anyone know how to get rid of the mpe whistle?

I have a 2015 435xi and installed the MPE. Right off the bat instantly there was an annoying whistle sound (around 4.5k rpms and higher). Took it to my local BMW dealership where i got it from and they had no idea what was causing the sound. They ended up warrantying the exhaust and put a completely new one on it and the same exact whistle was still present with the nee MPE. They told me that there could have been a manufacturing change some time between 2013-present and that they would have to contact BMW directly to figure it out. They still to this day dont have a clue what is causing the whistle, i am in the process of returning my mpe with a refund and getting a different aftermarket exhaust. Goodluck with solving this issue I have ripped my hair out trying to figure this out, hopefully you will discover the issue and dont have to go through the same process i have.

ctbear · 12-24-2018, 10:29 AM

Quote:

Originally Posted by Dr_Glob

I have a 2015 435xi and installed the MPE. Right off the bat instantly there was an annoying whistle sound (around 4.5k rpms and higher). Took it to my local BMW dealership where i got it from and they had no idea what was causing the sound. They ended up warrantying the exhaust and put a completely new one on it and the same exact whistle was still present with the nee MPE. They told me that there could have been a manufacturing change some time between 2013-present and that they would have to contact BMW directly to figure it out. They still to this day dont have a clue what is causing the whistle, i am in the process of returning my mpe with a refund and getting a different aftermarket exhaust. Goodluck with solving this issue I have ripped my hair out trying to figure this out, hopefully you will discover the issue and dont have to go through the same process i have.

The guy above mentioned the dealership saying it is due to the wastegate. So a catback muffler shouldn't have any effect on the whistle right?

12-18-2018, 12:23 PM	#1
jyerelek Private First Class 106 Rep 124 Posts Drives: 435i Join Date: Oct 2018 Location: Los Angeles iTrader: (1)	MPE Whistle When I first installed my M performance exhaust on my 435i, there is a distinct whistle that comes in the high RPM's of WOT. This was eliminated when I put a cat less down pipe on. However, I have taken the downpipe off and installed the factory catalytic converter back on. My question is does anyone know how to get rid of the mpe whistle?
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12-18-2018, 03:46 PM	#2
badbread not good, but bad 333 Rep 361 Posts Drives: 2013 335i Join Date: Jun 2016 Location: Bay Area, CA iTrader: (3)	Like this? __________________ They are spelled BRAKES not breaks!!!! Oh FFS, not another spark plug thread! BreadsBMW on Youtube
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12-18-2018, 08:11 PM	#4
perryo91 Captain 373 Rep 937 Posts Drives: 335 Join Date: Apr 2009 Location: Florida iTrader: (1)	Yes! I've always wondered this! Something with the turbo I'm assuming? __________________ Hi
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12-19-2018, 04:48 AM	#5
ChristosD First Lieutenant 97 Rep 373 Posts Drives: m135i Join Date: Sep 2015 Location: Durban iTrader: (0)	is this whistle happening with the valve open or closed or both? __________________ '14 F20 M135i EWG FBO:// INJEN INTAKE // PURE INLET// TURBOSMART BOV DUAL PORT // //CSF INTERCOOLER // ER CP // SNOW S2.5 METH KIT // B58TU HPFP // NGK 97506 // ER DP // TMSS MID PIPE //MPE // MPBBK // UR STRUT BRACE // BM3 CUSTOM JORDAN E85 TUNE // XHP STAGE 3 //
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12-19-2018, 09:35 AM	#6
perryo91 Captain 373 Rep 937 Posts Drives: 335 Join Date: Apr 2009 Location: Florida iTrader: (1)	Never tried closed to be honest. Most of the time when I’m past 5k rpm I’m in sport/+
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12-19-2018, 12:26 PM	#7
BulsaraF36 First Lieutenant 142 Rep 352 Posts Drives: F36 435i M-Sport Join Date: Apr 2016 Location: Harrisburg, NC iTrader: (8)	I hear it with my car during WOT. For me it wasn't noticable on stock dp but hear it more now on fabspeed sport cat dp. __________________ 2016 435i M-Sport \| Carbon Black \| 20" 624M Wheels \| MPPK \| MPE \| M Performance Brakes \| M Performance Steering Wheel II with Display \| xHP \| Dinan Stage 4 \| Dinan Big Turbo \| Dinan High Performance Intercooler \| Dinan Intake \| Dinan Shockware \| Fabspeed Sport Cat Downpipe \| Custom Quad Tips \| Autotecknic Red Paddle Shifters
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12-20-2018, 05:40 AM	#8
1QuikWS6 No 55mph 1619 Rep 8,476 Posts Drives: F32 435ix MSport Join Date: Jul 2009 Location: Blitzburgh, PA iTrader: (113) Garage List 2022 BMW M440ix Vert [0.00] 2015 BMW 435ix MSport [0.00] 2000 Pontiac Trans Am [0.00]	The whistle comes from the exhaust tips. When I 1st slid my tips on & adjusted them to stick out like I wanted - the tips were not pushed back onto the pipes as far as they would go. This left a gap between the edge of the pipe & the inner flap of the tips & as the exhaust gasses blew across this gap it made the whistle sound. Obviously the faster you go/revving the engine made the whistle even more noticeable due to exhaust gas speed I adjusted my tips to go back further and not leave a gap & the whistle is gone __________________ F32 435ix//MGM//M Sport-Prem-Tech-Driver Assist-Lighting-Cold Weather-Dyn Handling Pkgs//M4 Black Lthr Int w/M4 Alum Blade Trim//HK w/Bavsound Stg3//763M//M4 Euro LCI Tails//M4 Mirrors w/CF Covers//AWCarbon CF F/R Spoilers-Side Splitters-Diffuser 6WB/ID6 HU+HUD/IND M4 Alcantara Armrest//PURE S2 Turbo//AA FMIC+DP//ER CP+TIC//3.5bar TMAP/TS DV//AWE Tuning Exh w/Blk Tips//Turner MS CF Intake//BM3 Cary Jordan Tune//MPerf Diff//PrecRW Ignition Kit
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12-20-2018, 11:12 AM	#10
XutvJet Major General 5551 Rep 5,369 Posts Drives: 2011 Cayman Base, 2016 M235 Join Date: Mar 2016 Location: Kansas City iTrader: (-1)	The whistle is simply the freer flowing exhaust allowing you to hear more noise from the turbo. The sound you're hearing is the DME manipulating the wastegate to control boost in the upper rpms and you're hearing the exhaust hitting nearly supersonic speeds as it passes the edges wastegate flap. My M235 didn't have the whistle until I installed the MPE. The whistle also seems more prevalent in the lower gears. __________________ The forest was shrinking, but the Trees kept voting for the Axe, for the Axe was clever and convinced the Trees that because his handle was made of wood, he was one of them.
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