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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 > Wastegate Rattle Avoidance



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      06-20-2017, 08:48 PM   #1
JMonteil
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Wastegate Rattle Avoidance

I am curious about one thing regarding the well known and documented waste-gate rattle. I have searched but only find info on diagnosing and fixing the issue.

My question is simple; will the higher boost pressure from a tune cause the waste-gate actuator/arm to fail at an accelerated rate? Or is this unrelated? Excuse my ignorance, as I am not clear on how the internal waste-gate operates to come to my own conclusion. From what I am reading, It seems as though if it hasn't started rattling on its own yet, a tune may not make it any more likely.

Sorry to bring up topic thats been beaten to death, but any insight is greatly appreciated. Cheers!


-JM
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      06-21-2017, 07:43 AM   #2
335e92tx
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No definitive answer. I had a JB then MHD tune on a 07 n54 from 14K miles until 130K. Didn't start rattling until well past 120K. Oil use was less than .5 quart for 2000 until almost 100K then it went way up. Never hammered on it. Always let it get to 170 oil temp before even going 1/2 throttle.

Now I have a 13 IS (with MHD). Got about 3K miles on it and no signs of oil use. Drive it the same way I drove the old one. YMMV
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      06-21-2017, 09:56 AM   #3
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Thanks 335e92tx. I recently purchased an 07' with 47k miles, and have no hint of a rattle, with the car being completely stock. I've always babied my cars, and I don't rag on it at all. Sounds like its just something you have to roll the dice on.
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      06-21-2017, 10:46 AM   #4
FCobra94
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You'll be increasing the workload on a turbocharger that spins @ ~170k RPM and your main worry is accelerated wear on the waste-gate actuator/arm? lol

Your time would better be spent replacing vacuum hoses, testing boost solenoids, making sure there aren't any boost leaks, etc.
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      06-21-2017, 10:48 AM   #5
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High temperature damages them more than anything, so catless DP will help the most with longevity. Then proper tune.
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      06-21-2017, 04:35 PM   #6
JMonteil
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Quote:
Originally Posted by FCobra94 View Post
You'll be increasing the workload on a turbocharger that spins @ ~170k RPM and your main worry is accelerated wear on the waste-gate actuator/arm? lol

Your time would better be spent replacing vacuum hoses, testing boost solenoids, making sure there aren't any boost leaks, etc.
ok condescending... I have the means to work on and fix most all aspects of the motor, but the turbos blowing would be much more difficult that locating and fixing boost leaks as they occur. Having a new BMW that rattles sounding like a pos is just disconcerting

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Originally Posted by feuer View Post
High temperature damages them more than anything, so catless DP will help the most with longevity. Then proper tune.
Thanks! I think thats a good plan I can live with, DPs and FMIC first.
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      06-22-2017, 02:13 PM   #7
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Quote:
Originally Posted by JMonteil View Post
Having a new BMW that rattles sounding like a pos is just disconcerting
Which is exactly why your post doesn't make any sense...the rattle isn't a result of a "failing" WG actuator or actuator arm...it's the entire flapper assembly (bushing, arm, tab, flapper itself, etc.). Two completely different things; one obviously much easier to replace than the other.

Given you have "the means to fix most all aspects of the motor," I'm sure you already knew that though.
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