Problem with Performance exhaust: drone at 2.ooo rpm

MischiMischi · 08-30-2011, 01:06 AM

Hi,

my dealer in Germany installed the performance exhaust last week on my e90 M.
I really like this exhaust, it has a very exotic sound at 3.500-4000 rpm.

They only problem which I have with this exhaust is, that it drones!
My e90 has DKG and I drive it very often in the automatic mode (going to work in the morning, etc).

At 2.000 rpm the exhaust really has a drone. it is really disturbing and reduces the fun which I have with this exhaust a lot.
The automatic mode also switches gears up as fast as possible, so the engine is very often below 2.000 rpm. If you now accelerate slighty, the automatic mode will not switch the gears down. Now I get the drone

Does anyone has the same?
I am wondering, because when I checked in this forum, everyone said, that the performance exhaust has no drone at all...

Another issue which I have detected is, that the performance exhaust expanse when it is warm.
I have the hahmann-diffusor installed on my e90. With cold exhaust the tips are behind the diffusor (around 1 cm) - you can not see the ///M-logo on the tips.
If the exhaust is warm, the tips come out of the diffusor around 2-3cm - now you can see the ///M-Logo.

Has anyone recognized this on his performance exhaust?

Thank you for you helb.

Best regards from Germany,
Michael

Rshane · 08-30-2011, 02:31 AM

There is a difference between drone and normal exhaust sound. What I've discovered is some folks have differing opinions on what the difference is. The only common thing I've noticed is the younger the individual is the more likely they will say the sound you hear is normal exhaust sound, and the older folks will say what you are hearing is drone.

MischiMischi · 08-30-2011, 03:58 AM

I think it is definitely a drone - you can also feel a slight vibration.

edu09 · 08-30-2011, 04:24 AM

Quote:

Originally Posted by MischiMischi

I think it is definitely a drone - you can also feel a slight vibration.

You may have to tighten the bolts, your exhaust is probably loose, I dont have any problems with vibrations, drone or expansion on my exhaust

J08M3 · 08-30-2011, 06:09 AM

Quote:

Originally Posted by MischiMischi

I think it is definitely a drone - you can also feel a slight vibration.

Even OEM has slight drone at that RPM. BMW put out a tech bulletin about that years ago. In my opinion the performance drone is no more or less than the OEM muffler.

gthal · 08-30-2011, 07:36 AM

Don't drive at 2,000 RPM

The only time the M3 sees that number is as it passes it. I think what you are hearing is normal, expected and not dissimilar to the non-performance exhaust.

MischiMischi · 08-30-2011, 08:55 AM

Quote:

Originally Posted by edu09

You may have to tighten the bolts, your exhaust is probably loose, I dont have any problems with vibrations, drone or expansion on my exhaust

You were right, thanks a lot.

The garage shop around the corner just put my M on their auto lift.
One connecting pipe was twisted and one clamp was loose.

It looks like the drone is gone now. I will see tonight, when I drive home from the office.

chris s · 08-30-2011, 09:15 AM

Quote:

Originally Posted by SehrSchnell

Just get an Eisenmann Race instead.

LOL

edu09 · 08-30-2011, 09:19 AM

Quote:

Originally Posted by MischiMischi

You were right, thanks a lot.

The garage shop around the corner just put my M on their auto lift.
One connecting pipe was twisted and one clamp was loose.

It looks like the drone is gone now. I will see tonight, when I drive home from the office.

glad you solve it, now enjoy your exhaust, you are going to love it!

VictorH · 08-30-2011, 03:04 PM

There should be no drone with this exhaust really at any rpm. Glad you found the reason for the problem. I thought the German dealers were super conscientious about their service work but I guess you can find some who are not so hot too.

MischiMischi · 08-31-2011, 02:27 AM

Quote:

Originally Posted by VictorH

I thought the German dealers were super conscientious about their service work but I guess you can find some who are not so hot too.

I think this is the same all over the world...

08-30-2011, 01:06 AM	#1
MischiMischi Second Lieutenant 81 Rep 250 Posts Drives: M4 F82 Performance Join Date: Nov 2010 Location: Close To Frankfurt / Main iTrader: (0)	Problem with Performance exhaust: drone at 2.ooo rpm Hi, my dealer in Germany installed the performance exhaust last week on my e90 M. I really like this exhaust, it has a very exotic sound at 3.500-4000 rpm. They only problem which I have with this exhaust is, that it drones! My e90 has DKG and I drive it very often in the automatic mode (going to work in the morning, etc). At 2.000 rpm the exhaust really has a drone. it is really disturbing and reduces the fun which I have with this exhaust a lot. The automatic mode also switches gears up as fast as possible, so the engine is very often below 2.000 rpm. If you now accelerate slighty, the automatic mode will not switch the gears down. Now I get the drone Does anyone has the same? I am wondering, because when I checked in this forum, everyone said, that the performance exhaust has no drone at all... Another issue which I have detected is, that the performance exhaust expanse when it is warm. I have the hahmann-diffusor installed on my e90. With cold exhaust the tips are behind the diffusor (around 1 cm) - you can not see the ///M-logo on the tips. If the exhaust is warm, the tips come out of the diffusor around 2-3cm - now you can see the ///M-Logo. Has anyone recognized this on his performance exhaust? Thank you for you helb. Best regards from Germany, Michael
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08-30-2011, 02:31 AM	#2
Rshane M-Flight Member 38 Rep 1,085 Posts Drives: 2011 E92 M3 Join Date: Jul 2010 Location: San Antonio, Texas iTrader: (0)	There is a difference between drone and normal exhaust sound. What I've discovered is some folks have differing opinions on what the difference is. The only common thing I've noticed is the younger the individual is the more likely they will say the sound you hear is normal exhaust sound, and the older folks will say what you are hearing is drone. __________________ 2011 Le Mans Blue M3// Black extended Novillo w/ Blue Grey Aluminum trim/DCT/ZTP/ZCW/ZPP/ZCP Premium Sound ///Akrapovic Evolution Exhaust 2015 Audi S4 Prestige, Brilliant Black S-tronic 2012 Le Mans Blue 135i M Pkg DCT
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08-30-2011, 03:58 AM	#3
MischiMischi Second Lieutenant 81 Rep 250 Posts Drives: M4 F82 Performance Join Date: Nov 2010 Location: Close To Frankfurt / Main iTrader: (0)	I think it is definitely a drone - you can also feel a slight vibration.
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08-30-2011, 07:36 AM	#6
gthal Major General 1904 Rep 5,678 Posts Drives: 2018 340i xDrive Join Date: Jul 2007 Location: Canada iTrader: (2)	Don't drive at 2,000 RPM The only time the M3 sees that number is as it passes it. I think what you are hearing is normal, expected and not dissimilar to the non-performance exhaust. __________________ 2020 X3 M40i \| Black \| Current DD 2020 C8 Corvette \| Z51 \| Torch Red ... built and waiting for delivery 2016 M2 \| Long Beach Blue \| 6MT 2015 M4 \| Austin Yellow \| DCT 2012 MB C63AMG \| 2011 E92 M3 \| 2010 E92 M3
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08-30-2011, 03:04 PM	#10
VictorH Major 433 Rep 1,286 Posts Drives: '09 M3 Join Date: Dec 2007 Location: SC iTrader: (4)	There should be no drone with this exhaust really at any rpm. Glad you found the reason for the problem. I thought the German dealers were super conscientious about their service work but I guess you can find some who are not so hot too.
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