Wastegate rattle after catless downpipes

2Times · 08-09-2013, 05:19 PM

Quote:

Originally Posted by Electric

Thats the one!

Ya, it was kind of annoying... I was running Cobb Stage 2+... I could live with the noise knowing how fast it felt

F30Husker · 08-12-2013, 11:23 AM

Quote:

Originally Posted by dicostal

that happened to me as well. Thank God the shop who installed my DP could not stand it either and put a fix in place for me :-)
I guess they should make it a sticky some where since so many have the issue.

check it out.
http://www.e90post.com/forums/showthread.php?t=541370

Thanks for the reply. Hows it holding up? Still not rattle? Does it affect the turbos in any negative way?

dicostal · 08-12-2013, 01:33 PM

Quote:

Originally Posted by E90husker

Thanks for the reply. Hows it holding up? Still not rattle? Does it affect the turbos in any negative way?

no rattle after more than 2 years now, its been great.
I went to the dealer and they replaced the turbos and it did nothing at all, the rattle was perhaps even louder.

F30Husker · 08-12-2013, 01:52 PM

Quote:

Originally Posted by dicostal

no rattle after more than 2 years now, its been great.
I went to the dealer and they replaced the turbos and it did nothing at all, the rattle was perhaps even louder.

Same here, I had my turbos replaced in May, but didn't help with the wastgate rattle at all. Did you just do this fix to the rear turbo or did you find a way to access the front turbo as well? I'm thinking about using a washer to fill in the extra space rather than a e clip. This should accomplish the same thing correct?

dicostal · 08-13-2013, 11:15 AM

Quote:

Originally Posted by E90husker

Same here, I had my turbos replaced in May, but didn't help with the wastgate rattle at all. Did you just do this fix to the rear turbo or did you find a way to access the front turbo as well? I'm thinking about using a washer to fill in the extra space rather than a e clip. This should accomplish the same thing correct?

it was only the rear turbo causing the issue so it was easy to access, a washer should work as well, but how are you planning on getting the washer in there?

Seanpatio · 08-14-2013, 09:01 PM

I get a wierd rattle like a bolt is bouncing in my pipes on cold starts and when i bearly touch the throttle any idea what that is? Im taking my car in soon to get inspected. I have ar catless dps

Ill try n take a vid.. I dont have money to take my car in right now.

BMWM.D. · 08-14-2013, 09:31 PM

Quote:

Originally Posted by Seanpatio

I get a wierd rattle like a bolt is bouncing in my pipes on cold starts and when i bearly touch the throttle any idea what that is? Im taking my car in soon to get inspected. I have ar catless dps

Ill try n take a vid.. I dont have money to take my car in right now.

Could be the wastegates. Could also be the flap on the left muffler.

skim7x · 08-15-2013, 03:26 PM

I, too, have wastegate rattle, and have had it for a long time, even after having my turbos replaced TWICE. I used to be FBO, but I've actually taken my AR DP's OFF because the wastegate noise was just too embarrassing =( I miss the power...

Cozy · 08-16-2013, 06:14 AM

It's not always wastegates, well not as such anyway. The rod that connects to the wastegate actuator arm has a habit or vibrating/rattling as quite frankly the connection it makes with the arm is not tight enough to stop it moving slightly. This is a flaw with a good amount of N54 turbo's but not all of them which is odd however, you can fix this by inserting an E-Clip between then rod and the arm where they meet to take out the +/- 1mm of rattle room.

With stock DP's this rattle isn't heard, it only becomes audible when you remove the sound deadening stock Cats as the rattle of the rod resonates through the turbo.

One way to distinguish WG rattle with rod rattle is whether or not you can hear the rattle come out of the tailpipes as well as the engine. Rod rattle is engine only and may have actually been tripped but your DP install.

Best advise is to get under the car and look at the rear turbo. Check nothing is touching and if not, insert E-clip and see how you get on.

The old Mr5 trick won't work for rod rattle that I know of.

F30Husker · 08-20-2013, 10:15 PM

Quote:

Originally Posted by dicostal

it was only the rear turbo causing the issue so it was easy to access, a washer should work as well, but how are you planning on getting the washer in there?

I looked at the wastegate last night and plan on trying this fix the weekend. My question for you is, did you put the e clip on the other side of the actuator arm the doesn't have the clip the is currently on the turbo. Sorry I hope I explained that well enough for you to understand.

dicostal · 08-21-2013, 11:46 AM

Quote:

Originally Posted by E90husker

I looked at the wastegate last night and plan on trying this fix the weekend. My question for you is, did you put the e clip on the other side of the actuator arm the doesn't have the clip the is currently on the turbo. Sorry I hope I explained that well enough for you to understand.

I did not do it myself so i am not sure, what i can tell you they pushed it in from under the car standing in the front looking towards the back for the car to give you an ideal of the angle they used.

so if this is the car

--/***\__
|-o----o-|
*******\ --> this is the angle

hope this helps.

F30Husker · 08-21-2013, 12:21 PM

Quote:

Originally Posted by dicostal

I did not do it myself so i am not sure, what i can tell you they pushed it in from under the car standing in the front looking towards the back for the car to give you an ideal of the angle they used.

so if this is the car

--/***\__
|-o----o-|
*******\ --> this is the angle

hope this helps.

It looked like you could access it from the top as well. I will give it a shot this weekend. I'm guessing they put it on the other side of the wastegate arm, otherwise you would have the e clip pressing up against the original clip already on there.

dicostal · 08-21-2013, 02:06 PM

Quote:

Originally Posted by E90husker

It looked like you could access it from the top as well. I will give it a shot this weekend. I'm guessing they put it on the other side of the wastegate arm, otherwise you would have the e clip pressing up against the original clip already on there.

i believe that is exactly what they did, but either way it should achieve the same.

AWSAWS · 09-25-2014, 07:33 PM

Just had DPs put on. Finding the exact same. Also getting resonance at low revs. I'm wondering if it may also be the can flap?
Car has 31k miles. I don't think it's the wastegates.

boost junkie · 09-26-2014, 08:09 AM

Quote:

Originally Posted by AWSAWS

Just had DPs put on. Finding the exact same. Also getting resonance at low revs. I'm wondering if it may also be the can flap?
Car has 31k miles. I don't think it's the wastegates.

Mine rattles like crazy with only 30k miles. It's certainly the wastegates as you could barely hear it on cold start before. Now its real loud on cold starts and I can hear it on light spool. No combination of JB4 wastegate settings has fixed it. I'll be taking them back off to re-adjust the wastegate arms. If that doesn't work I'll just upgrade the turbos

Dusty335 · 05-21-2015, 04:38 PM

Help I just had my turbos and wastegates replaced and I put in bms catless down pipes and I still have an ugly rattle after accelerating

matreyia · 04-08-2018, 09:53 AM

when youi install aftermarket DP and you get a rattle, metallic sounding... it is most likely 99% due to the pipe closest to the passenger subframe vibrating against the subframe. Metal on metal.

All you need to do is loosen the support bracket on the midpipe to tranny connection on both the midpipes and the tranny locations, then loosen both DP to midpipe connections, then loosen the V bands, and re-adjust all pipes to swing as far away from the subframe as possible.

This is a very common problem and easily fixed.

Good luck. Drive Safe.

08-14-2013, 09:01 PM	#28
Seanpatio Second Lieutenant 238 Rep 268 Posts Drives: 2022 BSM F90 M5C Join Date: May 2012 Location: Los Angeles, Ca iTrader: (2)	I get a wierd rattle like a bolt is bouncing in my pipes on cold starts and when i bearly touch the throttle any idea what that is? Im taking my car in soon to get inspected. I have ar catless dps Ill try n take a vid.. I dont have money to take my car in right now.
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08-15-2013, 03:26 PM	#30
skim7x Colonel 213 Rep 2,558 Posts Drives: 335i, C63 AMG Join Date: Sep 2006 Location: USA iTrader: (4) Garage List 2007 335i [10.00]	I, too, have wastegate rattle, and have had it for a long time, even after having my turbos replaced TWICE. I used to be FBO, but I've actually taken my AR DP's OFF because the wastegate noise was just too embarrassing =( I miss the power... __________________ '07 Space Gray 335i coupe - R.I.P. COBB ProTuned \| AMS \| CP-e \| BMS \| Quaife
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08-16-2013, 06:14 AM	#31
Cozy Major 122 Rep 1,487 Posts Drives: E82 135i Join Date: Mar 2011 Location: Surrey, England iTrader: (0)	It's not always wastegates, well not as such anyway. The rod that connects to the wastegate actuator arm has a habit or vibrating/rattling as quite frankly the connection it makes with the arm is not tight enough to stop it moving slightly. This is a flaw with a good amount of N54 turbo's but not all of them which is odd however, you can fix this by inserting an E-Clip between then rod and the arm where they meet to take out the +/- 1mm of rattle room. With stock DP's this rattle isn't heard, it only becomes audible when you remove the sound deadening stock Cats as the rattle of the rod resonates through the turbo. One way to distinguish WG rattle with rod rattle is whether or not you can hear the rattle come out of the tailpipes as well as the engine. Rod rattle is engine only and may have actually been tripped but your DP install. Best advise is to get under the car and look at the rear turbo. Check nothing is touching and if not, insert E-clip and see how you get on. The old Mr5 trick won't work for rod rattle that I know of.
	Appreciate 0 Quote

09-25-2014, 07:33 PM	#36
AWSAWS Colonel 277 Rep 2,340 Posts Drives: E92 GC Turbos, FBO, 335i DCT Join Date: Nov 2012 Location: Valhalla iTrader: (0)	Just had DPs put on. Finding the exact same. Also getting resonance at low revs. I'm wondering if it may also be the can flap? Car has 31k miles. I don't think it's the wastegates.
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05-21-2015, 04:38 PM	#38
Dusty335 Registered 0 Rep 1 Posts Drives: BMW 335i Coupe Join Date: May 2015 Location: West Covina iTrader: (0)	Help I just had my turbos and wastegates replaced and I put in bms catless down pipes and I still have an ugly rattle after accelerating
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04-08-2018, 09:53 AM	#39
matreyia Private First Class 38 Rep 137 Posts Drives: 335i Convertible Montego Blue Join Date: Jun 2013 Location: Austin iTrader: (0)	It's not wastegate rattle folks when youi install aftermarket DP and you get a rattle, metallic sounding... it is most likely 99% due to the pipe closest to the passenger subframe vibrating against the subframe. Metal on metal. All you need to do is loosen the support bracket on the midpipe to tranny connection on both the midpipes and the tranny locations, then loosen both DP to midpipe connections, then loosen the V bands, and re-adjust all pipes to swing as far away from the subframe as possible. This is a very common problem and easily fixed. Good luck. Drive Safe.
	Appreciate 0 Quote