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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Rattle noise when i let off throttle



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      06-15-2011, 11:31 PM   #1
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Rattle noise when i let off throttle

Tries searching this one. Couldn't find exactly what I was looking for.

I have a 6 speed and when I first start the car and I take off once I let off the gas this annoying rattle noise happens in 1st
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      06-15-2011, 11:32 PM   #2
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Quote:
Originally Posted by bRUt@L` View Post
Tries searching this one. Couldn't find exactly what I was looking for.

I have a 6 speed and when I first start the car and I take off once I let off the gas this annoying rattle noise happens in 1st
Wastegates
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      06-15-2011, 11:37 PM   #3
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Originally Posted by Stangorang View Post
Wastegates
+1
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      06-15-2011, 11:39 PM   #4
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you should search for DIY wastegate adjustment on this forum.
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      06-15-2011, 11:52 PM   #5
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2008 335i  [3.78]
Sounds like the infamous wastegate rattle..
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      06-15-2011, 11:55 PM   #6
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Waste -------> gate
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      06-21-2011, 06:14 PM   #7
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that was ez

thx a lot
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      05-04-2012, 09:38 AM   #8
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man this forum is great! I have the same issue with my whip. Now i have to find out how to adjust it.
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      05-04-2012, 01:35 PM   #9
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Welcome..........
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      05-04-2012, 04:30 PM   #10
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      05-04-2012, 04:36 PM   #11
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      05-04-2012, 04:36 PM   #12
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Wastegate
Buy a procede and adjust the percentage value, then your good to go
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      05-04-2012, 06:57 PM   #13
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Wastegate rattle
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      05-08-2012, 09:36 PM   #14
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I have the same problem as well. Tried searching the DIY posts with no results. If anyone has a link to where i can find it let me know.
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      05-08-2012, 09:41 PM   #15
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Quote:
Originally Posted by Acepilot01 View Post
I have the same problem as well. Tried searching the DIY posts with no results. If anyone has a link to where i can find it let me know.
What is it that you want to DIY? The only solution for wastegate rattle that is DIY is Mr.5's fix. Search that.
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      05-08-2012, 09:51 PM   #16
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Quote:
Originally Posted by skim7x View Post
What is it that you want to DIY? The only solution for wastegate rattle that is DIY is Mr.5's fix. Search that.
That's not the only fix. Mr's 5's is a hardware fix via actuator adjustment. Even with the actuators adjusted properly you can still have rattle if the wastegate flapper is too close to the seat. In that case the best option is the software solution that both the Procede and BMS tunes offer.

The tune fix hold them apart just enough (when you find the right setting) so there is no rattle, but close enough that when you go on boost, the delay is not noticeable when you go on boost.

I would suggest if you have a tune, or are getting one to try the software fix first.
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      05-08-2012, 09:54 PM   #17
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Quote:
Originally Posted by scottp999 View Post
That's not the only fix. Mr's 5's is a hardware fix via actuator adjustment. Even with the actuators adjusted properly you can still have rattle if the wastegate flapper is too close to the seat. In that case the best option is the software solution that both the Procede and BMS tunes offer.
I didn't say that was the only fix. I said that's the only DIY, which is what the OP was looking for.
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      05-08-2012, 09:57 PM   #18
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Cool thanks guys
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      05-08-2012, 11:29 PM   #19
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Try all the diy's you can, but it could cost you new turbos. Mine got so bad that my wastegates wouldn't hold boost and I'd get limp mode.
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      05-09-2012, 06:46 AM   #20
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Rob Beck did a full redesign of the internal waste gates to billet material. The upgrade includes the bushing, flapper, flapper washer, arm, and lever. He found the stock parts to need improvement in their sloppiness.

His initial thoughts when first looking at the components 3 years ago:

Quote:
Originally Posted by Rob@RBTurbo View Post
It seems alot of times when people have rattle, the actuators are replaced initially in hopes the rattle goes away. Fair enough, cheap fix eh. Well if not, then the turbos are replaced. Ouch ($$).

For a while I wondered why this would be done but now believe I understand. What is wearing out on these things may or may not be the wastegate actuator, but its definitely the wastegate/flapper/arm assembly and bushing that are all integrated into the turbine housing. I am tearing one down now and am amazed at all the excess clearances in this assembly. So, that being said, anyone buying refurbished turbos be absolutely sure this has been addressed or you may end up with tons of $$ into housings that are going to turn into rattlers (or are already rattlers). It will take some fairly major work to correct this as well, as this assembly was not designed to be replaced (its considered "good for life" generally).

Im theorizing that since the flapper is held open so much of the time with this new actuator arrangement, the flapper and arm/assembly are constantly being subjected to exhaust pressures and heat. And since these are "floating" components they are subjected to lots of movements and rotations (flapper).. and hence wear. It seems that unless there was some revision in materials used or other supporting component, all of these cars will begin to rattle at some point.

It may end up being that the newer redesigned actuators help absorb vibrations in the actuator arm and flapper, so definitely replace these things if you are in there as they are cheap new (so I hear). Perhaps they have a tighter radial movement in the rod to keep the wastegate arm more stationary. This would definitely help keep the bushing and/or arm assembly from wearing, or at least extend the life of the components.

Rob
Quote:
Originally Posted by Rob@RBTurbo View Post
Moral of the story, theres a huge engineering error in the actual Turbo Turbine housing with the wastegate arm and associated bushing- they wear prematurely and begin to rattle. BMW installs the actuators to hopefully quiet things down enough to make the consumer happy and they leave them alone, but the root of the problem is not addressed unless the consumer still isnt content with the rattle and pursues a further fix.
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Last edited by scottp999; 05-09-2012 at 07:08 AM.
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      05-09-2012, 11:52 AM   #21
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