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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 03-24-2007, 12:05 AM   #1 (permalink)
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exhaust system

Hi i bought 3sires 328i model 1996 and i found butterfly valve in the end of the rear MUFFLER from the tips i was wondering how it works. Can anyone illustrate how this system work????
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Old 03-24-2007, 08:34 AM   #2 (permalink)
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by vacuum. the hose connected to the valve opens and closes the valve based on back pressure.
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Old 03-24-2007, 09:33 AM   #3 (permalink)
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ok the valve open and close by the vacuum but back pressure when it will be create ?

Thanks for the help
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Old 03-24-2007, 09:43 PM   #4 (permalink)
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not sure i understand what your asking there, but it doesn't close all the way, it's opening just varies based on exhaust pressure to maximize exhaust efficiency
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Old 03-25-2007, 02:30 AM   #5 (permalink)
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it basically does nothing
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Old 03-25-2007, 03:24 AM   #6 (permalink)
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Originally Posted by SHAHAB323IS
it basically does nothing

well. there u go, couldnt get a simpler answer than that...
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Old 03-25-2007, 03:34 AM   #7 (permalink)
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its ment to create backpressure at low RPMs so theoretically you will have a bit more torque to play with.
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Old 03-25-2007, 05:16 AM   #8 (permalink)
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Im asking because if i want change the rear mufller with performance one i have to cancel this system , so nothing will effect the engine if i cancel it right.

thanks guys .
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Old 03-25-2007, 12:05 PM   #9 (permalink)
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Quote:
Originally Posted by Limited
Im asking because if i want change the rear mufller with performance one i have to cancel this system , so nothing will effect the engine if i cancel it right.

thanks guys .
nope
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Old 03-25-2007, 03:35 PM   #10 (permalink)
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Quote:
Originally Posted by MiguelACA
well. there u go, couldnt get a simpler answer than that...
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Old 03-25-2007, 08:14 PM   #11 (permalink)
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I think it would be the same thing as the one on VW R32's? There is a mod referred to as the flapper mod. If it is taken off the car sounds better...
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Old 03-25-2007, 08:41 PM   #12 (permalink)
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Furious nailed it on the head. Exhaust valve allows the engineers to give stock headers a larger diameter without sacrificing low end torque. Large headers are dynamite for top end, but you get diminishing returns as rpms drop.
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Old 03-25-2007, 08:44 PM   #13 (permalink)
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Quote:
Originally Posted by 94BMW325i
I think it would be the same thing as the one on VW R32's? There is a mod referred to as the flapper mod. If it is taken off the car sounds better...
I've also read on another bimmer forum that some peeps took it off because it sounds deeper.

Uhhh yeah, that's because they're effectively doubling the final exhaust exit area. Sounds great, it's louder. But on an otherwise stock system, performance will drop. Drilling a bunch of holes in the muffler is likely to "improve" its sound as well, but not likely to improve performance.
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Old 03-25-2007, 09:49 PM   #14 (permalink)
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i noticed zero difference between having it and not having it, like i said earlier it basically does nothing, it was obviously intended to, but nothing noticeable
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Old 03-26-2007, 12:04 PM   #15 (permalink)
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oh ok, because on an R32 there def is a difference.
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