DP install help

Miller335 · 01-28-2014, 08:05 AM

Got the factory downpipes out without any issue but when I attempted to install the rear turbo DP(left V band somewhat loose for adjustment) it seems that in order to connect to the cat back pipes it wants to hit the mount that holds turbo's, in other words as I tighten catback side bolts/nuts it draws the DP into the turbo mount/engine(due to vband being loose).

It seems to clear the subframe just fine.

So I removed the bolts\nuts that connect to cat back, lined up the rear turbo DP perfectly between subframe and turbo bracket/engine, tightened down the Vband but when I try to connect to cat back it seems like its not perfectly lined up and its a strain to even start the nuts on the bolts to connect cat back.

Am I doing something wrong?
Or is this just how it is? Basically fitment is never perfect, something has to give and its the cat back you have to rank on to make up for fitment issues?

Miller335 · 01-28-2014, 05:02 PM

Guess I'm the only sucker who didn't farm this job out?

Myrder · 01-28-2014, 05:17 PM

I think you aren't getting as much feedback because your description is confusing. Point out on the picture what you are talking about. It may help some.

I've done two DP installs and never had issues. It helps to have another person hold the front of the DP up and tighten the vband. Also tighten the vband down first and loosen if needed to adjust to fit with catback.

Miller335 · 01-28-2014, 06:22 PM

Doh, I thought I explained it well.

OK new info.

I installed the longer DP(front) and it's a good 1/2 half inch closer to the catback side of the exhaust vs. the shorter/rear DP.

Also, the 02 bung on the longer pipe is out of place, the 02 sensor cannot reach the bung so it can't screw in.

No amount of adjusting the front/longer DP gets 02 close enough to screw in.

I think I might have the wrong pipes here.

Jeff@TopGearSolutions · 01-28-2014, 06:24 PM

Quote:

Originally Posted by Miller335

Doh, I thought I explained it well.

OK new info.

I installed the longer DP(front) and it's a good 1/2 half inch closer to the catback side of the exhaust vs. the shorter/rear DP.

Also, the 02 bung on the longer pipe is out of place, the 02 sensor cannot reach the bung so it can't screw in.

No amount of adjusting the front/longer DP gets 02 close enough to screw in.

I think I might have the wrong pipes here.

Which downpipes did you order?

R0oster · 01-28-2014, 08:01 PM

I installed the vbands tight then bolted the exhaust back to the downpipes

Miller335 · 01-28-2014, 08:26 PM

Quote:

Originally Posted by R0oster

I installed the vbands tight then bolted the exhaust back to the downpipes

I assume you had to do that to get the DP's exactly where you wanted them cause tightening them down catback side first would mess with your placement?

I think that's where I am.

Jeef · 01-28-2014, 08:30 PM

Quote:

Originally Posted by Jeff@TopGearSolutions

Quote:

Originally Posted by Miller335

Doh, I thought I explained it well.

OK new info.

I installed the longer DP(front) and it's a good 1/2 half inch closer to the catback side of the exhaust vs. the shorter/rear DP.

Also, the 02 bung on the longer pipe is out of place, the 02 sensor cannot reach the bung so it can't screw in.

No amount of adjusting the front/longer DP gets 02 close enough to screw in.

I think I might have the wrong pipes here.

Which downpipes did you order?

+1 this can explain a lot!

rdeterman · 01-28-2014, 08:35 PM

this is very hard to follow. I installed my downpipes by myself with zero issues.. Can you take a few pics of the issues your having?

thestein1016 · 01-28-2014, 09:22 PM

Quote:

Originally Posted by Miller335

Doh, I thought I explained it well.

OK new info.

I installed the longer DP(front) and it's a good 1/2 half inch closer to the catback side of the exhaust vs. the shorter/rear DP.

Also, the 02 bung on the longer pipe is out of place, the 02 sensor cannot reach the bung so it can't screw in.

No amount of adjusting the front/longer DP gets 02 close enough to screw in.

I think I might have the wrong pipes here.

My guess is BMS. If so, gotta go through engine bay, find the o2 sensor wire and unclip it from the mount to allow more slack.

Miller335 · 01-28-2014, 09:39 PM

Quote:

Originally Posted by thestein1016

My guess is BMS. If so, gotta go through engine bay, find the o2 sensor wire and unclip it from the mount to allow more slack.

That is correct. Terry got back to me on this and let me know about this step, thanks for heads up though.
I have all 4 mid pipe bolts/nuts started and vband clamps fitted but loose.

Guess I'll just keep playing with it and figure it out.
Still think I'll end up having to tighten vbands first to ensure perfect placement and no vibrating on something.

Otherwise if I tighten midpide side first it will pull DP into something making it vibrate on something.

Tiago@VRSF · 01-28-2014, 09:54 PM

Could be a defective set, Terry shouldn't have an issue swapping these for you.

Myrder · 01-29-2014, 12:19 AM

Quote:

Originally Posted by Tiago@VRSF

Could be a defective set, Terry shouldn't have an issue swapping these for you.

+1 the two I installed were BMS and I didn't have issues like this.

01-28-2014, 08:05 AM	#1
Miller335 Colonel 291 Rep 2,189 Posts Drives: 2007 E92 Join Date: Oct 2013 Location: Portland, OR iTrader: (0)	DP install help Got the factory downpipes out without any issue but when I attempted to install the rear turbo DP(left V band somewhat loose for adjustment) it seems that in order to connect to the cat back pipes it wants to hit the mount that holds turbo's, in other words as I tighten catback side bolts/nuts it draws the DP into the turbo mount/engine(due to vband being loose). It seems to clear the subframe just fine. So I removed the bolts\nuts that connect to cat back, lined up the rear turbo DP perfectly between subframe and turbo bracket/engine, tightened down the Vband but when I try to connect to cat back it seems like its not perfectly lined up and its a strain to even start the nuts on the bolts to connect cat back. Am I doing something wrong? Or is this just how it is? Basically fitment is never perfect, something has to give and its the cat back you have to rank on to make up for fitment issues?
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01-28-2014, 05:02 PM	#2
Miller335 Colonel 291 Rep 2,189 Posts Drives: 2007 E92 Join Date: Oct 2013 Location: Portland, OR iTrader: (0)	Guess I'm the only sucker who didn't farm this job out?
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01-28-2014, 05:17 PM	#3
Myrder Major 162 Rep 1,264 Posts Drives: 2010 E92 335i MSport 6MT LMB Join Date: Apr 2013 Location: WildWest iTrader: (1)	I think you aren't getting as much feedback because your description is confusing. Point out on the picture what you are talking about. It may help some. I've done two DP installs and never had issues. It helps to have another person hold the front of the DP up and tighten the vband. Also tighten the vband down first and loosen if needed to adjust to fit with catback. __________________ 2010\|335i\|LMB\|E92\|6MT\|MSport\|Logic7\|335is Clutch\|AE Performance\|BMS\|Walbro\|VRSF 7"\| 149.7mph NFZ AZ 1/2mi 1992\|Pontiac Firebird\|Mild 355ci\|T56\| -I will look on your treasures, gypsy. Is this understood?-
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01-28-2014, 06:22 PM	#4
Miller335 Colonel 291 Rep 2,189 Posts Drives: 2007 E92 Join Date: Oct 2013 Location: Portland, OR iTrader: (0)	Doh, I thought I explained it well. OK new info. I installed the longer DP(front) and it's a good 1/2 half inch closer to the catback side of the exhaust vs. the shorter/rear DP. Also, the 02 bung on the longer pipe is out of place, the 02 sensor cannot reach the bung so it can't screw in. No amount of adjusting the front/longer DP gets 02 close enough to screw in. I think I might have the wrong pipes here.
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01-28-2014, 08:01 PM	#6
R0oster Private First Class 1 Rep 119 Posts Drives: 2007 335i coupe Join Date: Mar 2013 Location: Maryland iTrader: (1)	I installed the vbands tight then bolted the exhaust back to the downpipes
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01-28-2014, 08:35 PM	#9
rdeterman First Lieutenant 11 Rep 399 Posts Drives: 2008 335i Coupe 6mt Join Date: Apr 2012 Location: Iowa iTrader: (2)	this is very hard to follow. I installed my downpipes by myself with zero issues.. Can you take a few pics of the issues your having? __________________ JB4 G5 ISO W/BMS FLASH, FBO, Walbro LPFP, Spec S2+ SMFW
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01-28-2014, 09:54 PM	#12
Tiago@VRSF 2095 Rep 43,350 Posts Drives: F90 M5 Join Date: Dec 2007 Location: Doral, FL iTrader: (99) Garage List 2014 F30 328xi [0.00] 2015 F82 BMW M4 [0.00] 2013 Ducati 1199 Pa ... [0.00] 2008 BMW 335i [0.00]	Could be a defective set, Terry shouldn't have an issue swapping these for you.
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