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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 > surging/flucuations while crusing in vaccuum



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      05-21-2012, 01:38 PM   #23
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Just read on forged DV website that blue > yellow > green. Can someone confirm?

On the website, they also have a set of red springs which they claim to be the strongest of all. Ok to run red?
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      05-21-2012, 10:21 PM   #24
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I had a surging like that while cruising at a constant speed and it ended up being a small vacuum leak in both of the hoses behind the oil filter. I messed with the DV springs forever before figuring that out. If you've never changed them it's worth a look on an '07.


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Just read on forged DV website that blue > yellow > green. Can someone confirm?

On the website, they also have a set of red springs which they claim to be the strongest of all. Ok to run red?
Correct, but you should be fine with yellow; I really don't think you'd want to run red if they're stiffer than blue.
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      05-21-2012, 10:32 PM   #25
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Quote:
Originally Posted by georgelb
I had a surging like that while cruising at a constant speed and it ended up being a small vacuum leak in both of the hoses behind the oil filter. I messed with the DV springs forever before figuring that out. If you've never changed them it's worth a look on an '07.


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Originally Posted by TT3 iN NyC View Post
Just read on forged DV website that blue > yellow > green. Can someone confirm?

On the website, they also have a set of red springs which they claim to be the strongest of all. Ok to run red?
Correct, but you should be fine with yellow; I really don't think you'd want to run red if they're stiffer than blue.
Thanks George! Will take a look this week. Hopefully the rain dies down here in NYC in the next day or 2.

Do you know which hoses they are or part number?
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      05-21-2012, 10:35 PM   #26
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You can see which ones in the thread below; I just stopped by the local auto parts store and got a couple feet of bulk vacuum hose from them.

http://www.e90post.com/forums/showthread.php?t=546560
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      05-21-2012, 10:39 PM   #27
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Quote:
Originally Posted by georgelb
You can see which ones in the thread below; I just stopped by the local auto parts store and got a couple feet of bulk vacuum hose from them.

http://www.e90post.com/forums/showthread.php?t=546560
Thanks! Much appreciated
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      05-21-2012, 10:51 PM   #28
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No problem; it's super easy/quick to do, so hopefully that's the issue.
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