|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
Opinion on unplugging exhaust flap boot connection
|
|
08-23-2016, 04:31 AM | #1 |
Captain
90
Rep 671
Posts |
Opinion on unplugging exhaust flap boot connection
So my car has the left sided exhaust flap rattle and it does my head it. When I had a jb4 I left set the can flap to on and the problem was gone. Since removing the jb4 it really does my head in. It's taken longer than expected to organize my exhaust so it was thinking of just unplugging the connection in the boot to enable the flap to remain open all the time
I've read so many conflicting things about it my head hurts. Question is does unplugging the connection cause any damage? Don't care about fuel economy. Any info regarding codes, shadow codes etc would be great!! |
08-23-2016, 04:46 AM | #3 |
Brigadier General
541
Rep 3,131
Posts
Drives: 2011 335i e92 DCT
Join Date: Sep 2015
Location: Australia, NSW
|
I was interested in cutting the fucker off, and have the car think it's still connected. Just tuck the moving parts away.
I was quoted on putting larger tips into the muffler, it would make it easier with the flap gone |
Appreciate
0
|
08-23-2016, 05:18 AM | #4 |
Jedi samurai ninja turtle
619
Rep 3,021
Posts
Drives: X3 M40i 2018
Join Date: May 2012
Location: Sydney, Australia
|
its fine, just do it, nike.
|
Appreciate
0
|
08-23-2016, 06:08 AM | #6 |
Brigadier General
541
Rep 3,131
Posts
Drives: 2011 335i e92 DCT
Join Date: Sep 2015
Location: Australia, NSW
|
|
Appreciate
0
|
08-23-2016, 06:12 AM | #7 |
Captain
90
Rep 671
Posts |
Yea, that's why I'm asking. Can't see why it would be bad. But people are like I unplugged it, then my turbo failed, leg was cut off and got fired from my job. All from unplugging the cable. So thought it check with the experts :-)
|
Appreciate
0
|
08-23-2016, 07:36 AM | #9 | |
Captain
90
Rep 671
Posts |
Quote:
In all seriousness, thanks though all for confirming. Thought it was dumb asking but better be safe |
|
Appreciate
0
|
08-24-2016, 12:25 AM | #10 |
Lieutenant Colonel
336
Rep 1,642
Posts |
my car came with the cable unplugged.
I recently plugged it back in and the exhaust valve still seems to open when the engine's cold. I think the valve is meant to stay closed until the engine heats up, right? |
Appreciate
0
|
08-24-2016, 07:05 AM | #11 |
Lieutenant General
4542
Rep 11,903
Posts |
I think the valve is to keep the exhaust sound down until the engine heats up. So logic would say it should be closed when first starting the car. Might be someone has done the golf tee mid where the rubber hose to the valve has been disconnected under the car and plugged with a golf tee. If that's the case, having the plug plugged back in won't make the valve close because the hose has been dusconnected. You'll have to get under the car to check it out
|
Appreciate
0
|
08-24-2016, 08:24 PM | #12 |
Brigadier General
1493
Rep 3,148
Posts |
The valve is used to alter the sound at particular rpms. Low loads its kept closed to keep the noise down.
On startup the valve is open during cold start, along with the turbo wastegates. This is why the car is loud on first start in the mornings, it is used to heat up the catalytic converters to reduce emissions. On my car with downpipes there's hardly any difference in sound, just makes the car a little bit more annoying when cruising. Personally I think its a waste of time and if you want better sound you should get an exhaust. If its rattling you should check if there's a leak somewhere as exhaust flap rattles are sometimes caused by leaks in vacuum lines.
__________________
|
Appreciate
0
|
08-25-2016, 12:17 AM | #13 |
First Lieutenant
68
Rep 314
Posts |
I unplugged it, then i did this. what is this muffler you speak of?
|
Appreciate
1
Boganian Rubes161.00 |
08-25-2016, 02:58 AM | #14 |
Lieutenant General
4542
Rep 11,903
Posts |
|
Appreciate
0
|
08-25-2016, 03:35 AM | #15 | |
Captain
90
Rep 671
Posts |
Quote:
New exhaust will come. Seems like the $$ are always going everywhere. We're getting close but! |
|
Appreciate
0
|
08-25-2016, 08:24 AM | #17 |
Brigadier General
1493
Rep 3,148
Posts |
Won't be able to check leaks easily without a vacuum gauge. Need to plug the vsccum gauge into your vsc system and check that it's pulling enough vacuum (25inHg or better is a healthy vac system). I made a vacuum tester by buying a cheap gauge off eBay and putting a 4mm barb on the gauge. This can easily yee into the rubber vac lines on the car.
|
Appreciate
0
|
Bookmarks |
|
|