n55 dp lower vband gasket leaks

Freestylerfalcon · 09-19-2020, 04:30 AM

hi friends.

ran into some trials and tribulations installong my cts turbo highflow catted dp on my 2014 n55 f30.

first off, i found that the support bracket that bolts stock dp to the transmission was missing. weird but no biggie.
then i found that the stock dp had no gasket on the lower vband. again pretty weird.

when installing the new vband with gasket, i found that when i tightened the clamp the gasket did not seat properly and bulged out where the bolt is, causing a really big exhaust leak.

ill attach some pics and u can see the gasket is no longer cicular where it bulged out.

i got sick of trying to make it seat properly and tightened the clamp without gasket, as thats how the stock one was clamped.

sadly i confirmed with some soapy water that there is a small exhaust leak there now.

planning to try and fit the gasket again tomorrow but worried that it wont work because its deformed now.

did anyone else run into this bullshit?

AK415 · 09-19-2020, 09:30 AM

How did you install the v band onto the downpipe? When I installed it on mine (Fabspeed), I pressed it (with the clamp) onto the dp before attaching the midpipe. You should be able to feel the "click" when pressing it on.

thejeremyman9 · 09-19-2020, 01:23 PM

Quote:

Originally Posted by AK415

How did you install the v band onto the downpipe? When I installed it on mine (Fabspeed), I pressed it (with the clamp) onto the dp before attaching the midpipe. You should be able to feel the "click" when pressing it on.

It's been a while since i did mine but this sounds right. You need to put the side with the gasket ring on first to the DP side, then pull the exhaust forward to go into the other side and tighten down. Maybe watch the kies video to confirm.

At this point i dont think you have a choice but to get a new lower gasket. You arent really supposed to resuse them even if they are deformed.

Also it sounds like someone had a DP on your car in its previous life.

zinner · 09-20-2020, 01:41 PM

I have found you lose up the bolt, reposition the metal gasket and re tighten that works. It's also possible to get a good seal with no gasket if the replacement pipe is machined well enough. I have reused that metal gasket at least 10 times.

09-19-2020, 04:30 AM	#1
Freestylerfalcon Private First Class 84 Rep 123 Posts Drives: 2020 G20 M340i Join Date: Sep 2017 Location: NSW Australia iTrader: (0)	n55 dp lower vband gasket leaks hi friends. ran into some trials and tribulations installong my cts turbo highflow catted dp on my 2014 n55 f30. first off, i found that the support bracket that bolts stock dp to the transmission was missing. weird but no biggie. then i found that the stock dp had no gasket on the lower vband. again pretty weird. when installing the new vband with gasket, i found that when i tightened the clamp the gasket did not seat properly and bulged out where the bolt is, causing a really big exhaust leak. ill attach some pics and u can see the gasket is no longer cicular where it bulged out. i got sick of trying to make it seat properly and tightened the clamp without gasket, as thats how the stock one was clamped. sadly i confirmed with some soapy water that there is a small exhaust leak there now. planning to try and fit the gasket again tomorrow but worried that it wont work because its deformed now. did anyone else run into this bullshit? Attached Images
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09-19-2020, 09:30 AM	#2
AK415 Lieutenant 197 Rep 417 Posts Drives: 2015 F32 435i Join Date: Oct 2018 Location: DFW iTrader: (1)	How did you install the v band onto the downpipe? When I installed it on mine (Fabspeed), I pressed it (with the clamp) onto the dp before attaching the midpipe. You should be able to feel the "click" when pressing it on.
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09-20-2020, 01:41 PM	#4
zinner Major 561 Rep 1,128 Posts Drives: `17 X5 35d/`15 335i/`18 M550IX Join Date: Oct 2014 Location: Raleigh, NC iTrader: (0)	I have found you lose up the bolt, reposition the metal gasket and re tighten that works. It's also possible to get a good seal with no gasket if the replacement pipe is machined well enough. I have reused that metal gasket at least 10 times.
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