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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 > Symptoms of failing diverter valves?



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      04-15-2016, 06:47 PM   #1
Miller335
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Symptoms of failing diverter valves?

Been trying to chase an issue that's been coming up lately.

Basically as I go WOT and build boost 3rd gear and above I feel a few "bumps" or "shakes" as the RPM's climb.

It's not a misfire or anything like that, car still runs strong but something is not quite right.

I'm still on stock diverter valves and these days I'm pushing 20-21 psi with Ken's MHD E60 flashes, it seems the more aggressive the tune the worse the issue is.

Anyone shed some light on what the symptoms of failing DV's are?
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      04-15-2016, 09:04 PM   #2
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Lab tested stock dvs were leaking at 12psi or more. Also brings up a question on your cp? Stock? If so orings sealing the dvs can leak too. Altho at 20psi many things can be stressed.
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      04-15-2016, 09:38 PM   #3
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I've been running wedges e60 21psi tune for a year on stock diverter valves with no issues.
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      04-15-2016, 11:37 PM   #4
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ER chargepipe with stock diverter valves.
Issue is recent.

Just wondering if anyone has been through stock DV's failing/not holding boost what that translates to when going WOT.
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      04-16-2016, 12:02 AM   #5
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Quote:
Originally Posted by Miller335 View Post
ER chargepipe with stock diverter valves.
Issue is recent.

Just wondering if anyone has been through stock DV's failing/not holding boost what that translates to when going WOT.
I had a similar issue that was caused by carbon build-up on the valves. When is the last time you had a walnut blast?
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      04-16-2016, 12:25 AM   #6
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Quote:
Originally Posted by GODDSPD View Post
I had a similar issue that was caused by carbon build-up on the valves. When is the last time you had a walnut blast?
9K miles ago.
I replace my plugged every 10K also.
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      04-16-2016, 01:10 AM   #7
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Quote:
Originally Posted by Sgop335 View Post
Lab tested stock dvs were leaking at 12psi or more. Also brings up a question on your cp? Stock? If so orings sealing the dvs can leak too. Altho at 20psi many things can be stressed.
Have you got a source for this info? The stock DVs by design hold a very high amount of boost, as long as there's not 3psi pressure drop from the charge pipe to the intake manifold (impossible at wide open throttle). They can fail from a combination of age and boost but a new set should have no issues at 25+ psi as long as they are clamped to silicone hose rather than o-ring fitting (They will be with any aftermarket CP anyway. Good luck running 25psi on a stock CP)

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      04-16-2016, 01:13 AM   #8
Miller335
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Wedge and another local member have a set of stock DV's for me install and test to see if I'm on the right track.

I'll report back as soon as I swap to a known good working set to see if I'm on the right track here.
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      04-16-2016, 02:38 AM   #9
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I don't like the stock diverter valves but they generally hold up okay. If/when they leak you'll generally need more WGDC to reach your target, you won't reach your target, you might get an underboost code, your charge temps will be higher... things like that.

The bumps/shakes are more often jacked timing, fueling issues, misfire-related things, or poor scaling in the tune (sudden load changes).
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      04-16-2016, 07:35 AM   #10
Miller335
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Thanks for the feedback everyone.
Fwiw here is a log, take a quick peak to see if anything stands out to you.

http://datazap.me/u/miller335/log-14...og=0&data=4-21
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      04-19-2016, 05:24 PM   #11
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Have you tried flashing it back to stock map and try to replicate the issues that way?
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