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      05-17-2011, 12:53 PM   #1
johnsfb
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My new 1M is going back to the dealers to have the exhaust checked out. There is a bad drone between 2200 and 2600 rpm. When I complained, the salesman took me up the road for a run in their demonstrator and it sounded fine. We then went the same route in mine and he immediately confirmed a problem so they're having a look at it on Monday 23rd. I'm having the 1200 mile service done while it's in.
Anyone else getting this drone?

Last edited by johnsfb; 06-02-2011 at 03:30 AM.
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      05-17-2011, 12:55 PM   #2
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One of the reviews recently mentioned it, take a look at the thread with all the review compilations. I want to say it was Jalopnik but I may be wrong.
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      05-17-2011, 01:13 PM   #3
Dan Parker
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Does it do it under throttle load or just cruising? Mine hasn't done it.
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      05-17-2011, 01:36 PM   #4
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Quote:
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Does it do it under throttle load or just cruising? Mine hasn't done it.
It does it under light or gradual throttle load eg. holding 70mph up a gentle hill or incline. It's very loud from about 65 through to 78 mph. whether the M button is engaged or not Before that or after that It's fine and no problem at all. As I said, their demo doesn't do it so it should be fixable.
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      05-17-2011, 01:48 PM   #5
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Mine is the same will be interested if you get a fix.
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      05-17-2011, 04:01 PM   #6
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Mine has terrible drone when I am cruising at any speed. Interested to hear your results.
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      05-17-2011, 04:07 PM   #7
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Mine has terrible drone when I am cruising at any speed. Interested to hear your results.
Really, compared to my other cars, this thing is bank vault quite

WB
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      05-17-2011, 04:19 PM   #8
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Quote:
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Really, compared to my other cars, this thing is bank vault quite

WB
Compared to the 135 I had with the Performance exhaust, it is much louder.
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      05-17-2011, 04:41 PM   #9
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Anyone have a video/audio clip of the issue?

Leif W.
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      05-17-2011, 04:57 PM   #10
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Anyone have a video/audio clip of the issue?

Leif W.
Yes I'd love to hear normal vs the issue. Just in case it happens to others and think nothing of it
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      05-17-2011, 05:01 PM   #11
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With the car cold grab the tips with both hands and push up, down, and side to side to see/hear if anything is hitting. That's if you want to even mess with it.
That noise could be good for 5 hp at the wheels.
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      05-17-2011, 05:03 PM   #12
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Compared to the 135 I had with the Performance exhaust, it is much louder.
I am used to driving a modded MINI Cooper S with no cat and 3" pipes that generated 118 DB on a sound meter on the dyno, that thing had a tremendous drone at 3000 in 6th gear, the 1M is loud but i don't hear a drone, a drone will drive you crazy on the highway.

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      05-17-2011, 05:14 PM   #13
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...a drone will drive you crazy on the highway.

WB
Yes. Yes it will.
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      05-17-2011, 05:24 PM   #14
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I'm interested to hear the outcome....
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      05-17-2011, 06:11 PM   #15
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Quote:
Originally Posted by Wild Bill View Post
I am used to driving a modded MINI Cooper S with no cat and 3" pipes that generated 118 DB on a sound meter on the dyno, that thing had a tremendous drone at 3000 in 6th gear, the 1M is loud but i don't hear a drone, a drone will drive you crazy on the highway.

WB
Exacly. That's why I'm having them check it out. It's almost like a bad aftermarket job.
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      05-17-2011, 06:23 PM   #16
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Quote:
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Exacly. That's why I'm having them check it out. It's almost like a bad aftermarket job.
I have a drone sound as well. I did not know it was a problem... I will have them look at it.

One question though, HOW DO WE KNOW THAT THIS IS A PROBLEM? And not the way the vehicle should sound?

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      05-17-2011, 06:45 PM   #17
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Quote:
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I have a drone sound as well. I did not know it was a problem... I will have them look at it.

One question though, HOW DO WE KNOW THAT THIS IS A PROBLEM? And not the way the vehicle should sound?
Because my dealer's demonstrator doesn't do it.
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      05-17-2011, 07:15 PM   #18
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Quote:
Originally Posted by johnsfb View Post
Quote:
Originally Posted by rapter View Post
I have a drone sound as well. I did not know it was a problem... I will have them look at it.

One question though, HOW DO WE KNOW THAT THIS IS A PROBLEM? And not the way the vehicle should sound?
Because my dealer's demonstrator doesn't do it.
Maybe there is something wrong with the dealers demo?
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      05-17-2011, 08:08 PM   #19
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Hi Guys

Having had alot of sports cars ive had abit of drone on some of my cars. Sometimes it takes a few hundred miles for the new exhaust to coke up abit as the sound should gradually deepen with time and that resonance might lessen then. Picking up my car soon so will soon see.

How many miles does the demo have on it?

Of course if its obviously faulty then get them to sort it. Could be heat-shield resonance or CAT problem as they could well use racing CATs. Perhaps a good quality sound clip might be helpful guys
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      05-17-2011, 08:12 PM   #20
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Quote:
Originally Posted by johnsfb View Post
It does it under light or gradual throttle load eg. holding 70mph up a gentle hill or incline. It's very loud from about 65 through to 78 mph. whether the M button is engaged or not Before that or after that It's fine and no problem at all. As I said, their demo doesn't do it so it should be fixable.
I have just an axleback on my 135i (n54). I have this same boom sounds of loud exhaust drone also happens with my car. JB3 fixed it, but it came back with JB4. I tried asking terry about what his tune could effect this noise, he was unable to speculate. I too wish to know what causes this loudness drone, it is rather annoying. There have been other threads about this subject in the past but they have since died unresolved.

If you find out please tell us!!!
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      05-17-2011, 08:16 PM   #21
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The exhaust sound will change over the first 500 miles (mine did and the sound only got better). There is a bit of exhaust drone, but I never really traveled at that speed on our ED. I only heard it a couple of times and it only existed in 6th gear at low rpms. That being said I think the problem can be cured with some added weight to the exhaust.
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      05-17-2011, 08:39 PM   #22
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my 135i with the performance exhaust had the same drone you're describing.. i just but the resonator back and it took care of 90% of it. i miss the popping and gurgles tho, now it's just growly but doesnt pop
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