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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 > DRONE: Who's got it, who doesn't ?



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      11-13-2007, 06:07 PM   #67
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^ The last I heard QTP still sucked, and their motors were still wearing out just as fast. I have heard good things from a few VW guys who use this though...

http://www.atpturbo.com/root/releases/release091004.htm

Its a little different though in the fact that it operates kind of like a wastegate off of a vac source, and it opens any time you go WOT.
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      11-13-2007, 06:26 PM   #68
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Originally Posted by BoostedBMW View Post
^ The last I heard QTP still sucked, and their motors were still wearing out just as fast. I have heard good things from a few VW guys who use this though...

http://www.atpturbo.com/root/releases/release091004.htm

Its a little different though in the fact that it operates kind of like a wastegate off of a vac source, and it opens any time you go WOT.
Cool idea, thanks for the link. Something to consider for sure but I'm not sure if I want it to open up every time I go WOT...
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      11-13-2007, 06:51 PM   #69
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Originally Posted by Chowbow View Post
Cool idea, thanks for the link. Something to consider for sure but I'm not sure if I want it to open up every time I go WOT...
Np... I wonder if you were to unplug the vac source if the valve would stay open or closed? I would assume that it would stay closed since it operates like a wastegate, but i'm not positive. It would be a PITA to plug and unplug it, but if you only wanted it for track days or every once and a while then it wouldn't be too bad.
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      11-13-2007, 11:46 PM   #70
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You can't miss drone. It seems that at around 2K to 2500 rpm the exhaust frequency matches the cabins acoustics and the results are a deep resonance throughout the car. It's kind of like blowing air over the top of a beer bottle and getting the "fog horn" sound. It can make you downright sick to your stomach if it's loud enough.
Very nice description of "drone".... that's exactly the effect the Eisenmann Race kit produces in my car in the 2-3K rpm range.
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      11-14-2007, 02:04 PM   #71
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Originally Posted by BoostedBMW View Post
Np... I wonder if you were to unplug the vac source if the valve would stay open or closed? I would assume that it would stay closed since it operates like a wastegate, but i'm not positive. It would be a PITA to plug and unplug it, but if you only wanted it for track days or every once and a while then it wouldn't be too bad.
Those ATP guys are in the Bay Area so I could go there and check it out / ask them. I actually had my S4 dyno'd there eons ago when they still had a dyno... Now I remember the shop and why that sounded familiar...
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      11-23-2007, 12:57 AM   #72
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AT!
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      11-24-2007, 04:34 PM   #73
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I just put on my CP-E exhaust and I was really surprised that for as aggressive sounding as it is, the drone is very minimal. I know that everyone has a different tolerance for drone and it depends on how you drive, but to my ears there really isn't intrusive sounding at all when cruising at 65-70mph.
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      05-22-2012, 07:19 AM   #74
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have the magnaflow touring for the 335i with AR downpipes (+oem 2nd cats) there is drone 1500-2000 rpm AT.

think will remove the secondary cats and replace with magnaflow 11379
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      05-22-2012, 09:07 AM   #75
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Has anyone actually dynoed a 335is before & after to see if the aftermarket exhausts do anything but make a power sound?
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