Just took delivery of 335i

rjm8282 · 10-02-2009, 11:58 AM

Hi All,

Just took delivery of a 2006 335i coupe. Its a really nice motor but to my dismay, after the delivery guy dropped off the vehicle I took it for a quick spin and found a problem. When ever the rev's are going down there is this horrible tinny, metallic sound. Really annoying. I have got it booked in at Cooper Bmw Reading to have a look at. They think it is the wastegate. Any recommendations on the fault and is there anything else I can get sorted under warranty while its there?

toxicnerve · 10-02-2009, 01:26 PM

Sorry if this is a retarded thing to say but I thought wastegates were illegal as they vent unfiltered exhaust gases straight to the atmosphere, or does it pass through the catalytic converter?

M3-FAST · 10-02-2009, 02:12 PM

Sounds likeit could be the high pressure Piezo Injectors - my 325i made a similar noise and when it was booked in they found no fault.

It was only when it broke down a few weeks later (different fault!!) and the BMW tech came out, he said it was the injectors and that lots of people are asking if the 'noise' is a fault.

If I left mine ticking over on the drive when warm, after about 5-10 mins they would stop doing it until I rev'd it again and then they would start making a noise again!

Cobu · 10-02-2009, 02:14 PM

take your time ...
http://www.e90post.com/forums/showthread.php?t=147781

SiKkBaSs · 10-02-2009, 03:46 PM

Quote:

Originally Posted by M3-FAST

Sounds likeit could be the high pressure Piezo Injectors - my 325i made a similar noise and when it was booked in they found no fault.

It was only when it broke down a few weeks later (different fault!!) and the BMW tech came out, he said it was the injectors and that lots of people are asking if the 'noise' is a fault.

If I left mine ticking over on the drive when warm, after about 5-10 mins they would stop doing it until I rev'd it again and then they would start making a noise again!

I get this tinny metallic sound when pulling off and say from changing from 3rd to 2nd. I mean it doesn't hamper performance or anything it just sounds weird. How was this fixed? Problem found?

rjm8282 · 10-02-2009, 03:49 PM

Thanks all, really starting to like the car, apart from the wastegate. I love the light in the lining of the car interior. How easy is it to get bluetooth fitted as a factory retrofit. I will do it myself, just time and cost?

I have ordered a M3 Style lip, I would like bluetooth next. I only have aux input so looking into usb ports as well.

rjm8282 · 10-02-2009, 03:54 PM

I'm uploading a video now through photobucket

toxicnerve · 10-02-2009, 04:13 PM

Right,

I have just re-read the OP. I feel I need to ask for confirmation of something. My understanding is as follows:

Wastegates operate when revs, therefore exhaust pressure, are increasing. A wastegate is precisely that, it's a valve that relieves excess exhaust pressure to prevent a tubro from spooling too highly. They are also illegal in the UK I believe as they vent exhaust gases directly to atmosphere without first passing them through a filter (this would result in back-pressure which would reduce the efficiency of the wastegate).

A dump-valve operates on zero throttle. This is to relieve excess pressure on the compression side of the turbo (i.e. the bit that actually supplies compressed, clean-air into your cyclinders). When no throttle is being applied the compressed (high pressure) air from the turbo has no-where to go (as the supply valves to the cyclinders are closed) causing a build up of pressure/back-pressure in the compression side of the turbo. This can have the effect of de-spooling your turbo (meaning it needs to be spooled back up). The dump-valve (also known as a blow-off) solves this problem by opening on zero throttle/excess pressure build up maintaining the optimum pressure in the compressor for minimal lag/throttle response....

This being the case, the OP describe the issue a occurring falling revs and therefore surely cannot be a wastegate issue...

OR:

Am I just way off base 'ere???

rjm8282 · 10-02-2009, 04:21 PM

See video

edowen · 10-02-2009, 05:45 PM

heat shield or similar? At least it is obvious and consistent, even the most incompetent dealer should be able to sort that!

seanblee · 10-02-2009, 06:29 PM

Quote:

Originally Posted by toxicnerve

Wastegates operate when revs, therefore exhaust pressure, are increasing. A wastegate is precisely that, it's a valve that relieves excess exhaust pressure to prevent a tubro from spooling too highly. They are also illegal in the UK I believe as they vent exhaust gases directly to atmosphere without first passing them through a filter (this would result in back-pressure which would reduce the efficiency of the wastegate).

You have the mechanics sort-of right, but you're utterly wrong with the legality. When the wastegate opens, exhaust gases are able to bypass the turbo impellor and pass straight into the exhaust system. At no point are exhaust gases vented to atmos without passing through the cat. Not sure where you got that from

toxicnerve · 10-02-2009, 07:16 PM

Quote:

Originally Posted by seanblee

You have the mechanics sort-of right, but you're utterly wrong with the legality. When the wastegate opens, exhaust gases are able to bypass the turbo impellor and pass straight into the exhaust system. At no point are exhaust gases vented to atmos without passing through the cat. Not sure where you got that from

Ah ok.

E90Yaz · 10-03-2009, 05:54 AM

Quote:

Originally Posted by toxicnerve

Ah ok.

UNLESS U HAVE A SCREAMER PIPE

E90Yaz · 10-03-2009, 06:07 AM

Quote:

Originally Posted by toxicnerve

Ah ok.

UNLESS U HAVE A SCREAMER PIPE

toxicnerve · 10-03-2009, 06:24 AM

Quote:

Originally Posted by E90Yaz

UNLESS U HAVE A SCREAMER PIPE

Yeah, I did a bit of reading last night after being put straight as it were. Turns out that you can mod your wastegate to bypass your exhaust system, this is the illegal bit. I knew I wasn't talking complete shite!!! Hey ho, so question remains, this issue is occurring on falling revs for the OP, is this still a wastegate issue? I assume in modern cars the wastegate is controlled electronically not pneumatically so a software issue could have caused this (as suggested in that other thread about the 29.2(?) software)....

rjm8282 · 10-03-2009, 10:21 AM

Hey all,

I have her booked in on Wednesday so I'll update all then. Hopefully they will be able to sort her out! I keep finding little quirks, the cruise control with the little dial that tells you the speed on the MPH clock, thats just fab!

SiKkBaSs · 10-03-2009, 10:35 AM

Quote:

Originally Posted by rjm8282

Hey all,

I have her booked in on Wednesday so I'll update all then. Hopefully they will be able to sort her out! I keep finding little quirks, the cruise control with the little dial that tells you the speed on the MPH clock, thats just fab!

Yeh that white speck shoots up when engaged.

BigBanana · 10-03-2009, 10:49 AM

Should have got yourself a diesel.
They don't make that noise....

..

doughboy · 10-05-2009, 03:49 AM

Quote:

Originally Posted by toxicnerve

I assume in modern cars the wastegate is controlled electronically not pneumatically so a software issue could have caused this (as suggested in that other thread about the 29.2(?) software)....

The wastgates (2 of them) on a 335i are still vacuum operated, but the vacuum supply is controlled by the ECU via solenoids (has been for years on turbo cars with ECUs).

Its very much a software issue.

BTW wastegates are there to control boost as you say, they open to allow exhaust to bypass the turbine at , so they can open or close at any time the ECU see's fit.

So, throttle OFF, revs falling the wastgates would open to cut boost as non is needed.

This is when the jangling occurs!!

Plenty to read about this one!!!

creepy coupe · 10-05-2009, 04:13 AM

Did you test drive the car before you bought it rjm8282 ?

doughboy · 10-05-2009, 04:16 AM

Quote:

Originally Posted by BigBanana

Should have got yourself a diesel.
They don't make that noise....

..

But at least he can fix the 335i, a diesel sounds like shit for ever

creepy coupe · 10-05-2009, 04:18 AM

Quote:

Originally Posted by doughboy

But at least he can fix the 335i, a diesel sounds like shit for ever

10-02-2009, 11:58 AM	#1
rjm8282 Private 5 Rep 97 Posts Drives: BMW 335i Coupe Join Date: Sep 2009 Location: Reading UK iTrader: (0)	Just took delivery of 335i Hi All, Just took delivery of a 2006 335i coupe. Its a really nice motor but to my dismay, after the delivery guy dropped off the vehicle I took it for a quick spin and found a problem. When ever the rev's are going down there is this horrible tinny, metallic sound. Really annoying. I have got it booked in at Cooper Bmw Reading to have a look at. They think it is the wastegate. Any recommendations on the fault and is there anything else I can get sorted under warranty while its there?
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10-02-2009, 01:26 PM	#2
toxicnerve Colonel 97 Rep 2,834 Posts Drives: E92 335d M-Sport Join Date: Jul 2009 Location: UK iTrader: (2)	Sorry if this is a retarded thing to say but I thought wastegates were illegal as they vent unfiltered exhaust gases straight to the atmosphere, or does it pass through the catalytic converter?
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10-02-2009, 02:12 PM	#3
M3-FAST Defected to the dark side..... 210 Rep 5,795 Posts Drives: BMW M5 LCi Join Date: May 2007 Location: Stafford, UK iTrader: (11) Garage List 2009 E90 M3 [10.00] 2007 325i M-sport C ... [9.00]	Sounds likeit could be the high pressure Piezo Injectors - my 325i made a similar noise and when it was booked in they found no fault. It was only when it broke down a few weeks later (different fault!!) and the BMW tech came out, he said it was the injectors and that lots of people are asking if the 'noise' is a fault. If I left mine ticking over on the drive when warm, after about 5-10 mins they would stop doing it until I rev'd it again and then they would start making a noise again!
	Appreciate 0 Quote

10-02-2009, 02:14 PM	#4
Cobu Second Lieutenant 14 Rep 210 Posts Drives: 2013 335i M-Sport 6MT Join Date: Aug 2008 Location: Philly iTrader: (0)	take your time ... http://www.e90post.com/forums/showthread.php?t=147781
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10-02-2009, 03:49 PM	#6
rjm8282 Private 5 Rep 97 Posts Drives: BMW 335i Coupe Join Date: Sep 2009 Location: Reading UK iTrader: (0)	Thanks all, really starting to like the car, apart from the wastegate. I love the light in the lining of the car interior. How easy is it to get bluetooth fitted as a factory retrofit. I will do it myself, just time and cost? I have ordered a M3 Style lip, I would like bluetooth next. I only have aux input so looking into usb ports as well.
	Appreciate 0 Quote

10-02-2009, 03:54 PM	#7
rjm8282 Private 5 Rep 97 Posts Drives: BMW 335i Coupe Join Date: Sep 2009 Location: Reading UK iTrader: (0)	I'm uploading a video now through photobucket
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10-02-2009, 04:13 PM	#8
toxicnerve Colonel 97 Rep 2,834 Posts Drives: E92 335d M-Sport Join Date: Jul 2009 Location: UK iTrader: (2)	Right, I have just re-read the OP. I feel I need to ask for confirmation of something. My understanding is as follows: Wastegates operate when revs, therefore exhaust pressure, are increasing. A wastegate is precisely that, it's a valve that relieves excess exhaust pressure to prevent a tubro from spooling too highly. They are also illegal in the UK I believe as they vent exhaust gases directly to atmosphere without first passing them through a filter (this would result in back-pressure which would reduce the efficiency of the wastegate). A dump-valve operates on zero throttle. This is to relieve excess pressure on the compression side of the turbo (i.e. the bit that actually supplies compressed, clean-air into your cyclinders). When no throttle is being applied the compressed (high pressure) air from the turbo has no-where to go (as the supply valves to the cyclinders are closed) causing a build up of pressure/back-pressure in the compression side of the turbo. This can have the effect of de-spooling your turbo (meaning it needs to be spooled back up). The dump-valve (also known as a blow-off) solves this problem by opening on zero throttle/excess pressure build up maintaining the optimum pressure in the compressor for minimal lag/throttle response.... This being the case, the OP describe the issue a occurring falling revs and therefore surely cannot be a wastegate issue... OR: Am I just way off base 'ere???
	Appreciate 0 Quote

10-02-2009, 04:21 PM	#9
rjm8282 Private 5 Rep 97 Posts Drives: BMW 335i Coupe Join Date: Sep 2009 Location: Reading UK iTrader: (0)	See video
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10-02-2009, 05:45 PM	#10
edowen Major 39 Rep 1,194 Posts Drives: E90 330i, 991 GTS, Cayenne S D Join Date: Nov 2008 Location: Uk iTrader: (0)	heat shield or similar? At least it is obvious and consistent, even the most incompetent dealer should be able to sort that!
	Appreciate 0 Quote

10-03-2009, 10:21 AM	#16
rjm8282 Private 5 Rep 97 Posts Drives: BMW 335i Coupe Join Date: Sep 2009 Location: Reading UK iTrader: (0)	Hey all, I have her booked in on Wednesday so I'll update all then. Hopefully they will be able to sort her out! I keep finding little quirks, the cruise control with the little dial that tells you the speed on the MPH clock, thats just fab!
	Appreciate 0 Quote

10-03-2009, 10:49 AM	#18
BigBanana Lieutenant 81 Rep 427 Posts Drives: Beemer F30 335D Join Date: Jul 2007 Location: Staffordshire iTrader: (0)	Should have got yourself a diesel. They don't make that noise.... ..
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10-05-2009, 04:13 AM	#20
creepy coupe Lieutenant General 1870 Rep 13,043 Posts Drives: BMW M340I G20 Join Date: Aug 2007 Location: UK iTrader: (2) Garage List 2015 BMW 435d [0.00] 2009 335i [0.00]	Did you test drive the car before you bought it rjm8282 ?
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