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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 > e92 exhaust bypass valve - 335i



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      11-07-2006, 11:35 PM   #1
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e92 exhaust bypass valve - 335i

Is the golf tee mod possible on the e92 335?
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      11-07-2006, 11:37 PM   #2
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Quote:
Originally Posted by RiXst3r
Is the golf tee mod possible on the e92 335?
Yes.
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      11-07-2006, 11:38 PM   #3
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Quote:
Originally Posted by shiv@vishnu
Yes.
Anyone know what difference in sound this makes for the 335?
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      11-08-2006, 08:53 AM   #4
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Nobody has done this to a stock 335i exhaust yet, that can compare before and after?
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      11-08-2006, 09:21 AM   #5
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Quote:
Originally Posted by NaViT
prolly not bro give it a few weeks maybe
Maybe i need to be the one to do it, and post my results...
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      11-08-2006, 12:24 PM   #6
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With the exhaust bypass open (vacuum hose pulled off the actuator on the driver's side exhaust tip), the car will be slightly louder at idle and cruise. It will sound the same under boost. Try it. It takes 10 seconds to do and easy to put back to stock if you don't like it.

-shiv
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      11-08-2006, 01:03 PM   #7
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does this mod have any affect on performance?
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      11-08-2006, 01:05 PM   #8
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Quote:
Originally Posted by jjw3477
does this mod have any affect on performance?
The car might idle a bit stronger, but i doubt it... i would say sound only
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      11-08-2006, 03:05 PM   #9
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Quote:
Originally Posted by RiXst3r
The car might idle a bit stronger, but i doubt it... i would say sound only
can someone please explain in detail what this "golf Tee" thing is, and how to do it?

Thanks
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      11-08-2006, 03:23 PM   #10
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Quote:
Originally Posted by trick50
can someone please explain in detail what this "golf Tee" thing is, and how to do it?

Thanks
Pull the vacuum tube off of the solenoid attached to your driver's side muffler and plug it with a golf tee and zip tie it off somewhere if you can... Atleast that is how you did it on the R32.
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      11-08-2006, 05:28 PM   #11
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Quote:
Originally Posted by Borti
Pull the vacuum tube off of the solenoid attached to your driver's side muffler and plug it with a golf tee and zip tie it off somewhere if you can... Atleast that is how you did it on the R32.

So....this hose is right in the back of the car...by the muffler? Does it help performance at all? Will it make the exhaust dramatically louder? I guess I will just try for myself whenever the rain stops here and we have a relativly warm day.
As long as it does not hurt performance./
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      11-08-2006, 05:32 PM   #12
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Does this "golf-tee" mod possible for e92 328i? Ive looked at the muffler in my car and i dont see any vaccume tube close to my muffler
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      11-08-2006, 05:39 PM   #13
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it makes the car VERY slightly louder. There will be a deeper tone at low to medium low rpm. There should be NO performance gain. At higher RPMs, the flap is open ANYWAY. at LOWER RPM you may actually LOSE some torque. The flap is designed to decrease noise AND increase backpressure at low RPM. This backpressure increase is designed to help low end torque.

Also guys.... You should take a look at the flap with the car OFF and the hose unplugged.

Some of BMW's cars are a little backwards. For instance, on the E65, early in production the valve was closed by vacuum, so if you unplugged it, it would be always open. But then they changed it so that it's OPENED by vacuum, so if you unplugged it, it'd never open! (I may be backwards, it MAY have gone from vacuum open to vacuum close. Doesn't change the statement!)
I don't beleive the 328 HAS the exhaust flap.
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      12-10-2006, 08:55 PM   #14
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      06-07-2007, 10:15 PM   #15
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So does anyone know if the 328 coupe have this flap?

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      06-08-2007, 03:24 AM   #16
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Quote:
Originally Posted by Definitive View Post
So does anyone know if the 328 coupe have this flap?

Definitive
No, it does not have it

Only 330i and 335i have
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      06-11-2007, 06:31 PM   #17
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Did it this weekend...

Took around 10 seconds...

Louder at idle and a little louder under throttle to around 3500 RPM.... Nothing drastic...
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      06-11-2007, 08:37 PM   #18
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Quote:
Originally Posted by ///Matt View Post
it makes the car VERY slightly louder. There will be a deeper tone at low to medium low rpm. There should be NO performance gain. At higher RPMs, the flap is open ANYWAY. at LOWER RPM you may actually LOSE some torque. The flap is designed to decrease noise AND increase backpressure at low RPM. This backpressure increase is designed to help low end torque.

Also guys.... You should take a look at the flap with the car OFF and the hose unplugged.

Some of BMW's cars are a little backwards. For instance, on the E65, early in production the valve was closed by vacuum, so if you unplugged it, it would be always open. But then they changed it so that it's OPENED by vacuum, so if you unplugged it, it'd never open! (I may be backwards, it MAY have gone from vacuum open to vacuum close. Doesn't change the statement!)
I don't beleive the 328 HAS the exhaust flap.
I'm not too sure if you would lose torque on the 335 though since back pressure really has no benefit with a turbo engine. If anything, less back pressure would mean faster spool, but the difference either way from an exhaust flap shouldn't be too large in any case.
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      06-17-2007, 03:51 AM   #19
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Did it on my 330i and my brother's E92 335i both sound a little louder at low RPM, at around 2000 is the most obvious.
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      06-17-2007, 10:18 AM   #20
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it just sounds different (better in my opinion). It's easy to just try and put back if you don't like the change. All it takes is the tee (or a screw is what I used) and a ziptie.
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