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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 > Forge DV's are they suppose to be louder than stock?



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      03-25-2009, 12:11 PM   #1
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Forge DV's are they suppose to be louder than stock?

I was reading on a few forums that aftermarket DV's are only suppose to be a little bit louder than stock. I did notice that the Forge's are noticebly louder (2-3times) than stock, and I can hear the DV's dumping boost when I let off the throttle at all RPM's
For instance if im in 4th at 3000rpm and nudge the throttle 1/5 and then wuickly let off I can hear the DV's making the psst sound

Is this normal? or should they be a lot quieter?

Yellow springs are being used.
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      03-25-2009, 12:12 PM   #2
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mine were louder, I liked it.
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      03-25-2009, 12:13 PM   #3
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mine are louder
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      03-25-2009, 12:27 PM   #4
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Quote:
Originally Posted by jpsimon View Post
mine are louder
Thanks, I thought that was normal.
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      03-25-2009, 01:36 PM   #5
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definitely louder than stock.
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      03-25-2009, 01:37 PM   #6
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Quote:
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mine were louder, I liked it.
+1
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      03-25-2009, 03:00 PM   #7
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yeah i actually noticed today the sound :-) very nice indeed.
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      03-25-2009, 03:05 PM   #8
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Louder but not by much
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      03-25-2009, 03:27 PM   #9
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Noticably louder with intake
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      03-25-2009, 03:37 PM   #10
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are DV's recommended for all applications or only with an automatic?
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      03-25-2009, 03:39 PM   #11
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Quote:
Originally Posted by turkish335 View Post
are DV's recommended for all applications or only with an automatic?
Recommended for a thorough bred (i.e. Manual)
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      03-25-2009, 03:43 PM   #12
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I don't see how an AT wouldn't benefit from upgraded DVs
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      03-25-2009, 04:57 PM   #13
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They should definetly be louder than stock.And with an open element intake ,they will most definetly be much louder than the stockers.
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      03-25-2009, 05:56 PM   #14
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Louder for sure, especially when shifting at WOT!
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      03-25-2009, 06:22 PM   #15
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Quote:
Originally Posted by XPO186 View Post
I don't see how an AT wouldn't benefit from upgraded DVs
Yeah, no reason it won't help, it's just more critical on the manual cars. Then again, I don't know how the DBW works in these, on my truck the DBW actually closes the throttle quite a bit on shifts, which on a turbo motor would have the same effect as lifting off the throttle quickly in a manual car between shifts.
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      03-25-2009, 06:35 PM   #16
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I don't think they are louder. I think you guys probably have intakes which exagerate every sound.
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      03-26-2009, 03:27 PM   #17
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Quote:
Originally Posted by XPO186 View Post
I don't see how an AT wouldn't benefit from upgraded DVs
I think both manual and auto will benefit in terms of reliability. A leaking DV will cause pre-mature turbo failure in the long run. The turbo will spin so many rpm more to make up the boost and fail far sooner. I personally dont view it as a performance add on but a safety feature especially on max boost cars.
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