Only one of the mufflers seem to be working... Dumb question

AnupT · 01-06-2016, 09:21 AM

On x5 it seems that only one- left side muffler is working as i see vapor/smoke coming out of it... The one on right side feels like a dummy one though i know that should not be the case... Is it same across all bmw's ??? Not sure

Kzang · 01-06-2016, 09:25 AM

For the 35i the right side exhaust is closed until it reaches a certain RPM. I believe it is around 3,500 or so when it will open up. There are mods you can do to keep the flap opened at all times, but I am not sure if it would cause any harm to the exhaust or not.

If you upgrade your exhaust to the M performance exhaust then both are opened full time.
Hope that answers your question.

stewy604 · 01-06-2016, 09:51 AM

First mod I did on the E82...do it!

AnupT · 01-06-2016, 09:55 AM

Thanks... Will surely do the mod... And another mystery solved.... Thanks Kzang

artem123 · 01-06-2016, 11:33 AM

How to do it? Just unplug the valve or codding needed?

Kzang · 01-06-2016, 11:53 AM

Quote:

Originally Posted by artem123

How to do it? Just unplug the valve or codding needed?

No coding required as far as I know. Look up Golf Tee mod and check out this thread on some of the 3 series guys on the mod. I've read in the past that this mod would cause some issues with backpressure and the car may lose some low end torque. I don't know if this is true or not.

http://f30.bimmerpost.com/forums/sho...d.php?t=761453

aw305 · 01-06-2016, 11:55 AM

Yea I did this mod. It cost me about 1500 and it's name was MPE lol

artem123 · 01-06-2016, 11:57 AM

Quote:

Originally Posted by Kzang

No coding required as far as I know. Look up Golf Tee mod and check out this thread on some of the 3 series guys on the mod. I've read in the past that this mod would cause some issues with backpressure and the car may lose some low end torque. I don't know if this is true or not.

http://f30.bimmerpost.com/forums/sho...d.php?t=761453

Thank you!
Before you replied i found this Golf Tee mod and honestly i am not sure if i am up to it

I am sure that BMW service will notice and they use every excuse to charge)))

stewy604 · 01-06-2016, 12:48 PM

^^^ Not sure you're up to it? You pull a vacuum line and shove a golf tee in it, voila! On the F15, because its electronic, just start the vehicle up from cold, ensure the flap is open (both pipes flowing), remove electrical connector, and the flap will now remain open. Putting into Sport mode should also open the flaps, I know it does on other BMW's.

Kzang · 01-06-2016, 01:35 PM

Quote:

Originally Posted by aw305

Yea I did this mod. It cost me about 1500 and it's name was MPE lol

Same here!

ZorroTheCat · 01-07-2016, 12:13 AM

Another mystery solved! Can't thank you guys enough - i was wondering about this last night and scratching my head.

Also, thanks to this forum, found the cargo net AND figured out an easy way to remove the safety label on the passenger side console.

5tony · 01-07-2016, 06:40 AM

I tried the golf tee mod on my N55 335i and it droned quite a bit. Has anyone done this on their X5 yet?

Kzang · 01-07-2016, 08:03 AM

Since it is easily reversible go for it!

r33_RGSport · 01-07-2016, 09:21 AM

Quote:

Originally Posted by 5tony

I tried the golf tee mod on my N55 335i and it droned quite a bit. Has anyone done this on their X5 yet?

Done it. No drone, but loosing the low end torque a little.

stewy604 · 01-07-2016, 09:39 AM

Quote:

Originally Posted by 5tony

I tried the golf tee mod on my N55 335i and it droned quite a bit. Has anyone done this on their X5 yet?

Noticed that too on my N55 135i, I actually like it. For a stock exhaust (wife's daily driver), it actually sounds pretty good.

AnupT · 01-07-2016, 09:47 AM

Quote:

Originally Posted by stewy604

^^^ Not sure you're up to it? You pull a vacuum line and shove a golf tee in it, voila! On the F15, because its electronic, just start the vehicle up from cold, ensure the flap is open (both pipes flowing), remove electrical connector, and the flap will now remain open. Putting into Sport mode should also open the flaps, I know it does on other BMW's.

Tried this... Both tail pipes were not blowing... I think i need to come up with a new way...

MattBianco · 01-07-2016, 11:20 AM

You may get a desired acoustic characteristic from this mod, but the pressure in the pipe is calculated and affects engine/power and emission system performance. Considerable thought was placed into the design by setting a valve to split the exhaust flow. A drop in back-pressure will certainly affect low RPM torque as r33 has stated.

There is no free lunch with this mod. You don't improve high RPM performance as both pipes are already open then. And you lose the need pressure for correct pulsing and drafting of the flowing gas. Two cents.

Doanster · 01-13-2016, 08:20 PM

Here's an interesting one...
Was behind an X1 for quite a bit just now while heading to dinner. The exhaust tips caught my eye. The car itself has a single muffler with two standard protruding pipes (no actual aesthetic chrome tips). I noticed that the right side pipe looked like it had a metal disc covering it up. Then it dawned on me that it's utilizing the same activated flap system like our F15s. I kept waiting for the flap to open, thinking that it hadn't because we never reached 30mph. When we got to a red light, though, that's when the flap opened! It has reverse logic compared to our cars. Whenever the car got under 10mph, the flap would open. Above that, the flap would close.
Wonder why they even bother to employ this on the X1. The diameter of the tailpipe itself is probably no bigger than a quarter and the flap is aft of the muffler, not before, so I don't see the benefit. Must have some positive aspect otherwise the engrs wouldn't design it in and add to the total BOM cost of the car.

MattBianco · 01-13-2016, 09:27 PM

Quote:

Originally Posted by Doanster

......Must have some positive aspect otherwise the engrs wouldn't design it in and add to the total BOM cost of the car.

Most likely one of the reasons in my note above. You can google exhaust pressure....there is quite a bit of science to it, and wider is only better in some situations, and higher pressure, in others. And like a race car, when faster flow is needed, the sudden opening can create draft opportunities. I would not mess with this.

Doanster · 01-13-2016, 09:50 PM

Definitely agree. My point was that the flap was so "downstream" of the exhaust itself that it doesn't make sense on the surface. You'd think they'd put it further back by where both pipes exit the single muffler...

tubby116 · 01-17-2016, 06:03 PM

Hi guys so I did the same thing I drove around in sports mode for my 2016 x5 for awhile, at high speed for about 25 minutes. And I came back home quickly removed the plug under the exhaust. And I still see no smoke or anything coming out of my passenger side exhaust this is frustrating.

Doanster · 01-17-2016, 08:21 PM

I do believe that method doesn't work on our cars. Physical removal of the flap is the answer IIRC. I'm sure Ben will chime in here as he's the one that did it prior to returning his car back to stock.
ROI not worth in IMO. It's not going to turn the exhaust into a grumbling MPE. How many people are going to walk up to you and point out that "one of your exhaust pipes is clogged"?

01-06-2016, 09:21 AM	#1
AnupT Private First Class 54 Rep 134 Posts Drives: 2016 X5 M Sport Join Date: Nov 2015 Location: New Jersey iTrader: (0) Garage List 2016 BMW X5 35i [0.00]	Only one of the mufflers seem to be working... Dumb question On x5 it seems that only one- left side muffler is working as i see vapor/smoke coming out of it... The one on right side feels like a dummy one though i know that should not be the case... Is it same across all bmw's ??? Not sure __________________ Current : 2016 X5 M-sport Retired: 2015 Audi Q5 2005 545i 2003 325i
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01-06-2016, 09:25 AM	#2
Kzang Major General 3240 Rep 5,066 Posts Drives: 2015 X5 35i Msport SG Join Date: Jun 2009 Location: East Coast iTrader: (0)	For the 35i the right side exhaust is closed until it reaches a certain RPM. I believe it is around 3,500 or so when it will open up. There are mods you can do to keep the flap opened at all times, but I am not sure if it would cause any harm to the exhaust or not. If you upgrade your exhaust to the M performance exhaust then both are opened full time. Hope that answers your question. __________________ 2015 F15 X5 35i Msport Space Grey M Performance parts MPPK, MPE
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01-06-2016, 09:51 AM	#3
stewy604 Lieutenant Colonel 290 Rep 1,547 Posts Drives: 2014 BMW X5 xDrive 35d M Sport Join Date: May 2014 Location: Vancouver, B.C. iTrader: (0)	First mod I did on the E82...do it! __________________ 2014 BMW X5 xDrive 35d M Sport Mineral White 2011 BMW 135i M Sport Space Grey 2007 Suzuki GSX-R 750
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01-06-2016, 09:55 AM	#4
AnupT Private First Class 54 Rep 134 Posts Drives: 2016 X5 M Sport Join Date: Nov 2015 Location: New Jersey iTrader: (0) Garage List 2016 BMW X5 35i [0.00]	Thanks... Will surely do the mod... And another mystery solved.... Thanks Kzang __________________ Current : 2016 X5 M-sport Retired: 2015 Audi Q5 2005 545i 2003 325i
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01-06-2016, 11:33 AM	#5
artem123 Captain 250 Rep 748 Posts Drives: G30 Join Date: Mar 2015 Location: Philly Burbs iTrader: (0)	How to do it? Just unplug the valve or codding needed? __________________ Ones drove a Reliant Robin. )))
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		BMW X5 and X6 Forum (F15/F16) > BMW X5 (F15) and BMW X6 (F16) Forum > BMW X5 and X6 (F15/F16) Forum
Only one of the mufflers seem to be working... Dumb question

01-06-2016, 11:55 AM	#7
aw305 Captain 1442 Rep 727 Posts Drives: F97 X3MC Alpine White Join Date: May 2015 Location: United States iTrader: (-1)	Yea I did this mod. It cost me about 1500 and it's name was MPE lol
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01-06-2016, 12:48 PM	#9
stewy604 Lieutenant Colonel 290 Rep 1,547 Posts Drives: 2014 BMW X5 xDrive 35d M Sport Join Date: May 2014 Location: Vancouver, B.C. iTrader: (0)	^^^ Not sure you're up to it? You pull a vacuum line and shove a golf tee in it, voila! On the F15, because its electronic, just start the vehicle up from cold, ensure the flap is open (both pipes flowing), remove electrical connector, and the flap will now remain open. Putting into Sport mode should also open the flaps, I know it does on other BMW's. __________________ 2014 BMW X5 xDrive 35d M Sport Mineral White 2011 BMW 135i M Sport Space Grey 2007 Suzuki GSX-R 750
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01-07-2016, 12:13 AM	#11
ZorroTheCat Enlisted Member 14 Rep 42 Posts Drives: '16 X6 Sapphire Black Metallic Join Date: Dec 2012 Location: Charleston, SC iTrader: (0)	Another mystery solved! Can't thank you guys enough - i was wondering about this last night and scratching my head. Also, thanks to this forum, found the cargo net AND figured out an easy way to remove the safety label on the passenger side console.
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01-07-2016, 06:40 AM	#12
5tony Lieutenant 147 Rep 500 Posts Drives: '21 M5/'15 X5 35i/'88 M3 Join Date: Jul 2010 Location: Atlanta iTrader: (1)	I tried the golf tee mod on my N55 335i and it droned quite a bit. Has anyone done this on their X5 yet? __________________
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01-07-2016, 08:03 AM	#13
Kzang Major General 3240 Rep 5,066 Posts Drives: 2015 X5 35i Msport SG Join Date: Jun 2009 Location: East Coast iTrader: (0)	Since it is easily reversible go for it! __________________ 2015 F15 X5 35i Msport Space Grey M Performance parts MPPK, MPE
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01-07-2016, 11:20 AM	#17
MattBianco Lieutenant Colonel 1280 Rep 1,886 Posts Drives: 2015 X5 35d msport Join Date: Jun 2014 Location: Marin, California iTrader: (0)	You may get a desired acoustic characteristic from this mod, but the pressure in the pipe is calculated and affects engine/power and emission system performance. Considerable thought was placed into the design by setting a valve to split the exhaust flow. A drop in back-pressure will certainly affect low RPM torque as r33 has stated. There is no free lunch with this mod. You don't improve high RPM performance as both pipes are already open then. And you lose the need pressure for correct pulsing and drafting of the flowing gas. Two cents. __________________ Amber or Red Rear Turn Signals? Vote/have your say: LINK. Post your MPGs 100L/km here: LINK X5 F15 Engines Compared LINK Take the BMW X5 F15 Survey: LINK See the Results: LINK N57 Diesel Tuning Chips Compared LINK Last edited by MattBianco; 01-07-2016 at 11:27 AM..
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01-13-2016, 08:20 PM	#18
Doanster Major 627 Rep 1,181 Posts Drives: 2014 F15 Carbon Black M-Sport Join Date: Aug 2009 Location: Oregon iTrader: (0)	Here's an interesting one... Was behind an X1 for quite a bit just now while heading to dinner. The exhaust tips caught my eye. The car itself has a single muffler with two standard protruding pipes (no actual aesthetic chrome tips). I noticed that the right side pipe looked like it had a metal disc covering it up. Then it dawned on me that it's utilizing the same activated flap system like our F15s. I kept waiting for the flap to open, thinking that it hadn't because we never reached 30mph. When we got to a red light, though, that's when the flap opened! It has reverse logic compared to our cars. Whenever the car got under 10mph, the flap would open. Above that, the flap would close. Wonder why they even bother to employ this on the X1. The diameter of the tailpipe itself is probably no bigger than a quarter and the flap is aft of the muffler, not before, so I don't see the benefit. Must have some positive aspect otherwise the engrs wouldn't design it in and add to the total BOM cost of the car. __________________ A little mod here, a little mod there...
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01-13-2016, 09:50 PM	#20
Doanster Major 627 Rep 1,181 Posts Drives: 2014 F15 Carbon Black M-Sport Join Date: Aug 2009 Location: Oregon iTrader: (0)	Definitely agree. My point was that the flap was so "downstream" of the exhaust itself that it doesn't make sense on the surface. You'd think they'd put it further back by where both pipes exit the single muffler... __________________ A little mod here, a little mod there...
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01-17-2016, 06:03 PM	#21
tubby116 New Member 0 Rep 6 Posts Drives: X5 35i M Sport Join Date: Jan 2016 Location: Brooklyn iTrader: (0)	Hi guys so I did the same thing I drove around in sports mode for my 2016 x5 for awhile, at high speed for about 25 minutes. And I came back home quickly removed the plug under the exhaust. And I still see no smoke or anything coming out of my passenger side exhaust this is frustrating.
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01-17-2016, 08:21 PM	#22
Doanster Major 627 Rep 1,181 Posts Drives: 2014 F15 Carbon Black M-Sport Join Date: Aug 2009 Location: Oregon iTrader: (0)	I do believe that method doesn't work on our cars. Physical removal of the flap is the answer IIRC. I'm sure Ben will chime in here as he's the one that did it prior to returning his car back to stock. ROI not worth in IMO. It's not going to turn the exhaust into a grumbling MPE. How many people are going to walk up to you and point out that "one of your exhaust pipes is clogged"? __________________ A little mod here, a little mod there...
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