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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 > Help me out with my 09 335i



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      07-15-2009, 10:19 PM   #1
okix
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Help me out with my 09 335i

okay so as I was gettting out of my car today a walked around behind it and as I was admiring my month old car, I noticed that the drivers side exhaust looked brand new and did not have the black exhaust build up that the passenger side had. I mean it has no exhaust in it what so ever. So I went back into the car started it up and then put my hands over the exhausts. Drivers side, nothing pasenger side-fine. If I look into the drivers side exhaust i can see the butterfly valve looks to be open but no exhaust coming out and you can actually touch the driver side exhaust without getting burned but the passenger side is obviously hot as hell. Now this was done not 2 minutes after I got home from driving the car. So the car was by all means warm.

After doing some searching on here I found that the cars have to me warm in order for exhaust gases to go out of both sides. Is it only when actually driving the car rather than at idle? Sorry, I will put on my flame suit but yes im still a newby to this car and I did my searching before hand.

BOTH


DRIVER SIDE


PASSENGER SIDE
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      07-15-2009, 10:41 PM   #2
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I have a 07 335i I did not notice anything like you are talking about. It might be due to the valve. I have aftermarket exhaust with does not use the valve. I my exhaust flows the same on both sides. I would not be to worried about it.
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      07-15-2009, 10:45 PM   #3
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but it doesnt flow the same out of both sides right now. Is this just at idle? does it flow out of both under acceleration? or is it blocked somehow?
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      07-16-2009, 12:49 AM   #4
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It's completely normal. Mine does it too and so does everyone elses that has a stock exhaust. This is my second 335. Do a search and you will see. It's cause the other side has the flap
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      07-16-2009, 01:24 AM   #5
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completely normal, no worries
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      07-16-2009, 01:48 AM   #6
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the drivers side flap only opens under WOT you can disable is so its always open search for golf tee mod it sounds a alot better with it!
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      07-16-2009, 12:46 PM   #7
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Quote:
Originally Posted by Rac3rX View Post
the drivers side flap only opens under WOT you can disable is so its always open search for golf tee mod it sounds a alot better with it!

No and then yes. The valve is shut at cold start idle for sound purposes only. has nothing to do with WOT. And the "golf tee mod" will trick the vavle into being open all the time.
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      07-16-2009, 12:50 PM   #8
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Quote:
Originally Posted by Rac3rX View Post
the drivers side flap only opens under WOT you can disable is so its always open search for golf tee mod it sounds a alot better with it!
yep
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      07-16-2009, 12:56 PM   #9
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my car does the same thing its bone stock the driver side has exhaust coming out of it and when the car warms up both pipes has exhaust gases coming from them its normal
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