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      08-23-2016, 05:31 AM   #1
aaron_
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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!!
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      08-23-2016, 05:39 AM   #2
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No damage caused. It does leave the code though.
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      08-23-2016, 05:46 AM   #3
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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
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      08-23-2016, 06:18 AM   #4
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its fine, just do it, nike.
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      08-23-2016, 07:04 AM   #5
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Man people over think these cars somtimes, pull it out.

I cut mine off for muffler delete, no fucks given.
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      08-23-2016, 07:08 AM   #6
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Quote:
Originally Posted by MJ80. View Post
Man people over think these cars somtimes, pull it out.

I cut mine off for muffler delete, no fucks given.
There are threads on the negative impact unplugging causes.
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      08-23-2016, 07:12 AM   #7
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Quote:
Originally Posted by EB89 View Post
There are threads on the negative impact unplugging causes.
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 :-)
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      08-23-2016, 07:51 AM   #8
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Yeah man careful to not be crushed by the moon or something while or after unplugging it
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      08-23-2016, 08:36 AM   #9
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Quote:
Originally Posted by Boganian Rubes View Post
Yeah man careful to not be crushed by the moon or something while or after unplugging it
Thanks for the tip mate - can count on the Aussies to go above and beyond with useful, factual info!! :-)


In all seriousness, thanks though all for confirming. Thought it was dumb asking but better be safe
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      08-24-2016, 01:25 AM   #10
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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?
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      08-24-2016, 08:05 AM   #11
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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
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      08-24-2016, 09:24 PM   #12
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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.
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      08-25-2016, 01:17 AM   #13
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I unplugged it, then i did this. what is this muffler you speak of?


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      08-25-2016, 03:58 AM   #14
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Quote:
Originally Posted by Daenerys View Post
I unplugged it, then i did this. what is this muffler you speak of?


Haha straight pipes FTW
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      08-25-2016, 04:35 AM   #15
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Quote:
Originally Posted by vtl View Post
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.
Any guidance as to where to check for the leak?

New exhaust will come. Seems like the $$ are always going everywhere. We're getting close but!
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      08-25-2016, 09:19 AM   #16
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Straight pipe with mhd gurgle is the only way to go with the n54.
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      08-25-2016, 09:24 AM   #17
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Quote:
Originally Posted by aaron_ View Post
Any guidance as to where to check for the leak?

New exhaust will come. Seems like the $$ are always going everywhere. We're getting close but!
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.
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