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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY: 335i Exhaust Sound Mod. Better, and even easier than golf tee mod.



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Revlis's Avatar DIY: 335i Exhaust Sound Mod. Better, and even easier than golf tee mod.
Revlis
08-28-2007
OK I know I am not the first to do this, someone had to clue me in, but instead of plugging, crimping, or otherwise disconnecting the vacuum line under the car, just unplug the actuator in the trunk in front of the drivers side tail light. I was a little unclear as to how this works, but it's dead...
  #22  
By 335iheLLraiseR on 08-28-2007, 11:34 PM
i think this would be good for those of you that are weary of getting under the car without knowing exactly what the results are. what should be done is a combination of both, first do it this way, if you like the results, plug it back in, get under the car and do it the other way. that way there are no error codes logged for those who care if it does log it.

i dunno just my .02.

but great write up anyways, kinda made me laugh with the wording.
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  #23  
By dinkoh on 08-28-2007, 11:48 PM
It's so easy "I" can do it. golf tee (ball bearing) mod is so quick and dirty.
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  #24  
By nico335 on 08-29-2007, 02:46 AM
any cons of having this logged into the ecu?
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  #25  
By Revlis on 08-29-2007, 10:40 AM
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Quote:
Originally Posted by that guy nico View Post
any cons of having this logged into the ecu?
Cannot think of any other than having a bunch of codes for the dealer to sort through if you have an issue. I cannot imagine what other possible use the valve is other than sound.

I'm not too worried about it. I figure if you are really concerned about it, just play dumb while they replace your actuator. ME? I'll prolly just tell em, "I unplugged it cause it makes the VROOM VROOM Sound better"...

Cannot think of any other issues. Hope you all enjoyed the step by step pics.

It's a damned simple thing, but hearing folks tell you how easy and obvious it is is not as handy as a picture showing you that, "Yup, just that damn easy"...
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  #26  
By omg516 on 08-29-2007, 11:46 AM
Interesting. Maybe I'll give this a shot.
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  #27  
By urnuts on 08-29-2007, 12:56 PM
Thing is....

even if the fault is recorded, what happened? Apparently the connector was poorly fitted at the factory and it came undone by itself.
No mods, no cuts, nothing.
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  #28  
By ScottyGams on 08-29-2007, 12:59 PM
b-e-a-utiful!
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  #29  
By Don Juan on 08-29-2007, 01:13 PM
Just what I noticed with the GolfTee or any metohods of allwing the actuar valve to be open all the time is gas mileage and a bit of off the line punch . I plugged in my hose again and I'm getting 2 mpgs better gas consumption... anyone else has this experience??
but for what is worth, the slight sound increase was nice..going for my 2nd tank of gas and Im averaging 17.8 mpg (85%city 15% hwy) and with the valve off I was done to 15 to 16 mpg weird...
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  #30  
By Revlis on 08-29-2007, 02:02 PM
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Quote:
Originally Posted by Don Juan View Post
Just what I noticed with the GolfTee or any metohods of allwing the actuar valve to be open all the time is gas mileage and a bit of off the line punch . I plugged in my hose again and I'm getting 2 mpgs better gas consumption... anyone else has this experience??
but for what is worth, the slight sound increase was nice..going for my 2nd tank of gas and Im averaging 17.8 mpg (85%city 15% hwy) and with the valve off I was done to 15 to 16 mpg weird...
All in your mind most likely, kind of a seat of the Pants dyno effect... Prolly getting better mileage because you're not busy revving your motor to listen to the music? Looking at the layout of the exhaust system and given that it's a turbo motor, a little flapper valve out back appears to do little more than quiet things down a bit. Turbo's don't rely on exhaust back pressure to improve torque, there is no gain or loss to be had. My understanding anyway.
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  #31  
By Alex@AKMotorwerk on 08-29-2007, 02:10 PM
Quote:
Originally Posted by urnuts View Post
even if the fault is recorded, what happened? Apparently the connector was poorly fitted at the factory and it came undone by itself.
No mods, no cuts, nothing.
Had the actuator behind the taillight unplugged when i took it to the dealer to get my idrive updated. They didn't mention anything to me or even plug it back in.

Maybe it doesn't record a fault or maybe my dealer just didn't give a sh!t
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  #32  
By gonzo on 08-29-2007, 02:10 PM

Stock- 18.7mpg
PROcede car /no golf tee mod- 18.3 mpg
Golf tee only mod- 16.4 mpg
SS/TT and golf tee mod 16.0 mpg
Who the hell knows...................
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  #33  
By picus on 08-29-2007, 02:13 PM
So uhhhh, since I am lazy, what the hell does this do? Yes, I know it shuts of a vacuum line. What's the end result? Car gives me bjs?
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  #34  
By Alex@AKMotorwerk on 08-29-2007, 02:16 PM
Quote:
Originally Posted by picus View Post
So uhhhh, since I am lazy, what the hell does this do? Yes, I know it shuts of a vacuum line. What's the end result? Car gives me bjs?
Yep... BJ's and an occasional hand job too

if you did a you would know that it just keeps the flap open on the exhaust to make it sound a little louder
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  #35  
By Revlis on 08-29-2007, 03:15 PM
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Originally Posted by picus View Post
So uhhhh, since I am lazy, what the hell does this do? Yes, I know it shuts of a vacuum line. What's the end result? Car gives me bjs?
Ads a little more bark to your Dog... Not much else. Pretty minor really but it gives your ride a voice when just puttering around. Trust me on this one, you'll start seeking out parking garages... It sounds great. Deep and Rorty.

The BJs are just gravy...
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  #36  
By morten_m on 08-29-2007, 03:49 PM
Great job on the write-up Revlis! Did it today, while doing some other mods to my 335.
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  #37  
By Bimmer335i07 on 08-29-2007, 05:01 PM
Yeah, too bad you don't hear a difference with the e90s.

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  #38  
By tintivilus on 08-29-2007, 05:24 PM
Quote:
Originally Posted by urnuts View Post
even if the fault is recorded, what happened? Apparently the connector was poorly fitted at the factory and it came undone by itself.
No mods, no cuts, nothing.
hahah. I wrapped up the plug back to the wiring harness with felt tape; it *almost* looks like the factory wanted it that way, save for the useless solenoid and vacuum line. It seemed like asking for trouble to leave the plug bouncing around behind the trunk lining.
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  #39  
By picus on 08-29-2007, 05:37 PM
Oh ok. I've got an exhaust so maybe I will try it and if I hate it I will just plug
'er back in.
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  #40  
By eleven11 on 08-29-2007, 07:22 PM
Quote:
Originally Posted by Bimmer335i07 View Post
Yeah, too bad you don't hear a difference with the e90s.

Completely disagree from my experience.
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  #41  
By eleven11 on 08-29-2007, 07:23 PM
Quote:
Originally Posted by Chesmu View Post
the actuator he's unplugging controls the vacuum that controls this valve.
sigh. did you not see that my comment was a reply about something unrelated to this thread?
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  #42  
By ATG on 08-29-2007, 07:37 PM
Revlis, awesome DIY pictures!
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  #43  
By HyperM3 on 08-30-2007, 10:26 AM
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Originally Posted by eleven11 View Post
Completely disagree from my experience.
I agree to disagree with you and concur with Scott. Didnt notice enough to warrant doing it.

Secondly, and this could be pure coincidence, but 3 days after I unplugged mine in the trunk I had an o2 sensor go bad. When I took it to get replaced, my SA showed me the tech sheet where the solenoid sensor malfunction was recorded over 200 times. Then the tech said that the closing of the butterfly isnt necessarily for sound restrictions, but has to do with backpressure as well. This helps the cats warm up properly and get to operating temps. He said when this is disabled, you run the risk of damaging your emissions equipment.

Now I dont know if that was a load of bunk, but with the amount of issues Im having with this car, I dont need to give it anymore pushes in that direction.
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