Driving to work this morning...weird noise started...

PunjabiM3 · 07-07-2010, 10:07 AM

I was on my way to work this morning when a weird noise started. Got to the I-10 onramp, gave the car WOT through 5k rpm in first, second, and third. When I let off the gas there was a weird noise coming from the rear. My best description of it would be a sound like a chain saw. Got worse through my commute and calmed down a little bit by the time I got to work. I figured maybe the Vorsteiner diffuser in the back somehow got loose and was rattling against the muffler tips. Got to work and visually everything looks normal. Could it be that something has broken inside one of the Dinan mufflers? Again, noise only comes when I am off the gas; it is not audible when I am on the throttle or when the clutch is pushed in. Any thoughts are greatly appreciated! Thanks.

PunjabiM3 · 07-07-2010, 02:57 PM

The more I think about it I think the issue is (or is from) the Fabspeed high flow cats. I am trying to see if I can have ESS check out the car while I am out of town since they are pretty local to me. I would be surprised if the issue is not from the Fabspeed setup...will hopefully find out soon.

PunjabiM3 · 07-07-2010, 05:23 PM

Have contacted Fabspeed and still waiting for a call back. Will be taking it to ESS to have it looked at, though it probably won't be until next week since I am going out of town first thing tomorrow morning.

DevJ · 07-07-2010, 06:10 PM

Could you feel it 'rattle'? I think it might be your HFCs rubbing on the heat shield.

PunjabiM3 · 07-07-2010, 06:52 PM

Quote:

Originally Posted by DevJ

Could you feel it 'rattle'? I think it might be your HFCs rubbing on the heat shield.

It is not from the heat shield I can pretty much guarantee that. I have had the HFC's now for almost a year and have around 7k miles on them. We took a rubber mallet back then and went to town on the heat shield since our first attempt caused a rattle from the heat shield. I am thinking one of the cats is probably blown or perhaps one of the welds in the Fabspeed pipe has broken(?)...

Ben335 · 08-17-2010, 01:08 PM

Any updates?

PunjabiM3 · 08-19-2010, 11:19 AM

Quote:

Originally Posted by Ben335

Any updates?

Cats were fine. Some how one of the bolts that hold the rear differential to the subframe was sheared so the diff was hitting against the subframe under throttle. Had the bolt replaced and all is good. Am slowly starting to unmod the car as I plan on getting into something else late this year or early next. Currently have the Fabspeed setup for sale and also will be removing the H&R springs in a week or so if anyone is interested.

Trier Germany · 08-19-2010, 04:15 PM

Quote:

Originally Posted by PunjabiM3

Cats were fine. Some how one of the bolts that hold the rear differential to the subframe was sheared so the diff was hitting against the subframe under throttle. Had the bolt replaced and all is good. Am slowly starting to unmod the car as I plan on getting into something else late this year or early next. Currently have the Fabspeed setup for sale and also will be removing the H&R springs in a week or so if anyone is interested.

How is the ///M scene in Tucson? I may be moving there in Apr 2011

PunjabiM3 · 08-19-2010, 07:41 PM

Quote:

Originally Posted by Trier Germany

How is the ///M scene in Tucson? I may be moving there in Apr 2011

there are a few of us that meet weekly. Between the four of us we have an e92 M3, e90 M3, e46 M3 cabrio, M coupe, and an e30 M3.

Eugene-TAIWAN · 08-19-2010, 08:06 PM

heat shield

PunjabiM3 · 08-19-2010, 09:32 PM

Quote:

Originally Posted by Eugene-TAIWAN

heat shield

Wasn't the heat shield. This was an initial problem I had when it was first installed and we put the car back up on the lift and pushed the heatshield out of the way with a rubber mallet. That solved any heat shield rattle I was having.

Trier Germany · 08-20-2010, 03:52 PM

Quote:

Originally Posted by PunjabiM3

there are a few of us that meet weekly. Between the four of us we have an e92 M3, e90 M3, e46 M3 cabrio, M coupe, and an e30 M3.

What do you guys do for road racing tracks? is the autocross scene ok? Man i'm gonna miss the Nordschleife!

07-07-2010, 10:07 AM	#1
PunjabiM3 Colonel 253 Rep 2,091 Posts Drives: M5 CS Join Date: Mar 2008 Location: Flower Mound, TX iTrader: (1)	Driving to work this morning...weird noise started... I was on my way to work this morning when a weird noise started. Got to the I-10 onramp, gave the car WOT through 5k rpm in first, second, and third. When I let off the gas there was a weird noise coming from the rear. My best description of it would be a sound like a chain saw. Got worse through my commute and calmed down a little bit by the time I got to work. I figured maybe the Vorsteiner diffuser in the back somehow got loose and was rattling against the muffler tips. Got to work and visually everything looks normal. Could it be that something has broken inside one of the Dinan mufflers? Again, noise only comes when I am off the gas; it is not audible when I am on the throttle or when the clutch is pushed in. Any thoughts are greatly appreciated! Thanks. __________________ 2012 Audi R8 V10TT\| 6MT\| Suzuka Grey 2015 Ferrari 458 Speciale\| Rosso Scuderia 2020 BMW X7\| Mineral White 2024 718 GT4 RS \| Arctic Grey
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07-07-2010, 02:57 PM	#2
PunjabiM3 Colonel 253 Rep 2,091 Posts Drives: M5 CS Join Date: Mar 2008 Location: Flower Mound, TX iTrader: (1)	The more I think about it I think the issue is (or is from) the Fabspeed high flow cats. I am trying to see if I can have ESS check out the car while I am out of town since they are pretty local to me. I would be surprised if the issue is not from the Fabspeed setup...will hopefully find out soon. __________________ 2012 Audi R8 V10TT\| 6MT\| Suzuka Grey 2015 Ferrari 458 Speciale\| Rosso Scuderia 2020 BMW X7\| Mineral White 2024 718 GT4 RS \| Arctic Grey
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07-07-2010, 05:23 PM	#3
PunjabiM3 Colonel 253 Rep 2,091 Posts Drives: M5 CS Join Date: Mar 2008 Location: Flower Mound, TX iTrader: (1)	Have contacted Fabspeed and still waiting for a call back. Will be taking it to ESS to have it looked at, though it probably won't be until next week since I am going out of town first thing tomorrow morning. __________________ 2012 Audi R8 V10TT\| 6MT\| Suzuka Grey 2015 Ferrari 458 Speciale\| Rosso Scuderia 2020 BMW X7\| Mineral White 2024 718 GT4 RS \| Arctic Grey
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07-07-2010, 06:10 PM	#4
DevJ Colonel 154 Rep 2,736 Posts Drives: R8 V10+/YMB M4 Join Date: Nov 2007 Location: Tulsa, OK iTrader: (1)	Could you feel it 'rattle'? I think it might be your HFCs rubbing on the heat shield. __________________ ‘23 RRS First Edition '22 X7 M50i '18 R8 V10+ http://www.bimmerpost.com/forums/attachment.php?attachmentid=133578&d=1204654487[/IMG]
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08-17-2010, 01:08 PM	#6
Ben335 Captain 46 Rep 891 Posts Drives: 09 M3 Finally here Join Date: Jul 2008 Location: Virginia iTrader: (2)	Any updates? __________________ 09 SG E90, Black on Carbon Leather, Tech, Premium, Cold, iPod, Premium Sound, 19s, OEM Alarm, PDC, Moonroof, Sirius Eisenmann Sport / Eibach Springs / 35% F1 Pinnacle Tint / Macht Schnell Air Filter / LUX Angel Eyes / Black Grill / AA Pulley / Powerchip Stage II Tune / Fabspeed X-Pipe & HFC / RAC Monolites RG63
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08-19-2010, 08:06 PM	#10
Eugene-TAIWAN Brigadier General 249 Rep 3,157 Posts Drives: E92 M3 Coupe Join Date: Jun 2009 Location: Taiwan iTrader: (4)	heat shield __________________ Past: Gintani stage3 M3, Cayman GTS present: Porsche 993RWB, 964RS America,996 cupcar, 964 turbo 3.6,Macan Turbo,997GT2,930 turbo,i3, MINI JCW
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