Dealing with the alphabet soup EGR/DPF/SCR

dumalei · 07-24-2015, 02:56 AM

Quote:

Originally Posted by Yozh

Yeah porting the wastegate should do no harm in a stock car either. But gutting the SCR will prevent one going back to stock when desired, unless you replace the gutted component. I'm sure you had thought about that.

is it okay to sell the car with dpf deleted?

Persian Whisperjet · 07-25-2015, 09:25 AM

The gutting process would seem straightforward. Anything to watch out for?

Mik325tds · 07-25-2015, 09:45 AM

Quote:

Originally Posted by dumalei

is it okay to sell the car with dpf deleted?

Not unless your buyer agrees and wants it that way. I'd disclose it in writing and have him/her sign that.

kg4kdn · 07-25-2015, 11:51 AM

Quote:

Originally Posted by dumalei

is it okay to sell the car with dpf deleted?

Sell it to someone in a diesel non-emission state and explain the benefits. Like tds said though, get them to sign a statement that they know it has been done. I'm sure that if you were ready to sell, someone in this group would know someone that wanted it.

Mik325tds · 01-31-2016, 05:42 PM

I guess it's time for an update. After driving on a HPDE event I noticed excessive smoke on full throttle runs. My conclusion was that my SCR now started to clog up and restricted the exhaust gas flow. Time to get rid of the internals.
I transported the full exhaust with a Flex to my friend Matt who was able to weld it back together with a stainless steel welder. He wasn't all too pleased with his work, so I'm not posting the finished work but I think it looks perfect.
The process is quite simple. Uninstall the exhaust, cut open the upper side of the the SCR with a side grinder, bash and remove the SCR material, vacuum the remains and weld shut again.
The sound is now much throatier and the turbo whistle is quite pronounced. As Persian Whisperjet noted, the smell is a bit different now. A little bit more like the old diesels, but still not very pleasant. At least not with MI diesel.

Persian Whisperjet · 01-31-2016, 06:03 PM

Definitely more whistle and grunt with the SCR empty.

tek4tex · 01-31-2016, 07:46 PM

Quote:

Originally Posted by Persian Whisperjet

Definitely more whistle and grunt with the SCR empty.

I use the recirculation on airflow to minimize the odor to more fully enjoy the turbo whistle and more grunt

Mark M · 02-01-2016, 11:00 AM

Quote:

Originally Posted by Mik325tds

I guess it's time for an update. After driving on a HPDE event I noticed excessive smoke on full throttle runs. My conclusion was that my SCR now started to clog up and restricted the exhaust gas flow. Time to get rid of the internals.
I transported the full exhaust with a Flex to my friend Matt who was able to weld it back together with a stainless steel welder. He wasn't all too pleased with his work, so I'm not posting the finished work but I think it looks perfect.
The process is quite simple. Uninstall the exhaust, cut open the upper side of the the SCR with a side grinder, bash and remove the SCR material, vacuum the remains and weld shut again.
The sound is now much throatier and the turbo whistle is quite pronounced. As Persian Whisperjet noted, the smell is a bit different now. A little bit more like the old diesels, but still not very pleasant. At least not with MI diesel.

Looks good. Question, if one preferred not to have increased whistle, is there something else we could have welded in to keep the car more stealth and or maybe keep the odor down?

iaknown · 02-01-2016, 01:20 PM

Quote:

Originally Posted by Bob@BPC

Install a high flow oxidation cat. We just installed this one made by Bohl diesel

Bob, by any chance did you do dyno tests with the catted downpipe? I'm curious as to any differences from an open one....

BEWWWM · 02-01-2016, 01:30 PM

Quote:

Originally Posted by Bob@BPC

Install a high flow oxidation cat. We just installed this one made by Bohl diesel

Holy curb rash!

someone let the 'ol lady take the car for spin

HeatherM35d · 02-01-2016, 02:20 PM

Quote:

Originally Posted by BEWWWM

Quote:

Originally Posted by Bob@BPC

Install a high flow oxidation cat. We just installed this one made by Bohl diesel

Holy curb rash!

someone let the 'ol lady take the car for spin

You think that front wheel is bad? You should see the rear quarter panel and rim on the same side.. Don't even want to show you the lower control arm..

BEWWWM · 02-01-2016, 03:35 PM

Drive by feel!!

HeatherM35d · 02-01-2016, 06:48 PM

Quote:

Originally Posted by BEWWWM

Drive by feel!!

Got a ticket for bald tires..

Mik325tds · 02-02-2016, 06:59 AM

Quote:

Originally Posted by Bob@BPC

Install a high flow oxidation cat. We just installed this one made by Bohl diesel

Jup. That's gonna happen next. Will report back with subjective measures of improvement.

TDIwyse · 02-02-2016, 08:19 AM

Quote:

Originally Posted by Mik325tds

Jup. That's gonna happen next. Will report back with subjective measures of improvement.

That would be appreciated. Think there are several of us who have considered this but were concerned about sufficient EGT's to get good conversion... I'd be interested in seeing some EGT vs "smell" data. But I'm not quite sure how that would be done. Do you have a wife you could strap to the bumper area for some real time feedback?

shnaggs · 02-02-2016, 08:35 AM

Quote:

Originally Posted by TDIwyse

That would be appreciated. Think there are several of us who have considered this but were concerned about sufficient EGT's to get good conversion... I'd be interested in seeing some EGT vs "smell" data. But I'm not quite sure how that would be done. Do you have a wife you could strap to the bumper area for some real time feedback?

Lol

BB_cuda · 02-02-2016, 09:17 AM

If this isn't any trouble, EGT temps under high load are only part of the story. I think TDI was interested (and me too) in EGT data when engine wasn't under much load. In other words, what EGT at idle or when just cruising at 1500 rpm? We are hoping EGT is warm enough there to get scrubbing in normal driving conditions too. We all smell stink parked in driveway or at traffic lights.

rulonger · 02-02-2016, 09:23 AM

I would have to say that my only complaint (and complaints from the family) are about the more pronounced smell after the delete. I am interested in a fix.

TDIwyse · 02-02-2016, 09:31 AM

Quote:

Originally Posted by Bob@BPC

oh, well at idle it was 500f (after running the car on the dyno) , pt was 660 - 750f on the street

EDIT: I also asked Jason, the owner, to keep track of the EGTs, so we can compare over time.

Cool.

BB_Cuda is right about my interest. I typically cruise at 55-60 with EGT's barely above 400F, and it's lower in town traffic or at idle. That's the main scenario I'm interested in. 350-400F seems low compared to graphs of converter lightoff temps I've seen.

For example: http://www.blackthorn.net/diesel-engines/

CvilleBill · 02-02-2016, 09:48 AM

Diesel fumes make me horny!

DWR · 02-02-2016, 03:53 PM

This is one of the things that drove me crazy about tuning gas engines. I could get the engines to run smoothly at AFR of 16:1, but the catalytic converters needed below 14.7 to work their best at idle. Burning more fuel to save the environment just never sat right with me.

Mik325tds · 02-02-2016, 06:43 PM

Quote:

Originally Posted by DWR

This is one of the things that drove me crazy about tuning gas engines. I could get the engines to run smoothly at AFR of 16:1, but the catalytic converters needed below 14.7 to work their best at idle. Burning more fuel to save the environment just never sat right with me.

+1. Burning more fuel for lower emissions somehow shouldn't be the answer.

07-25-2015, 09:25 AM	#200
Persian Whisperjet Kind of a Big Deal 171 Rep 857 Posts Drives: 2011 335d Join Date: Dec 2012 Location: Washington, D.C. iTrader: (0)	The gutting process would seem straightforward. Anything to watch out for?
	Appreciate 0 Quote

01-31-2016, 05:42 PM	#203
Mik325tds Major 808 Rep 1,192 Posts Drives: 335d M-Sport Join Date: Jul 2014 Location: Greater Detroit iTrader: (0)	SCR delete I guess it's time for an update. After driving on a HPDE event I noticed excessive smoke on full throttle runs. My conclusion was that my SCR now started to clog up and restricted the exhaust gas flow. Time to get rid of the internals. I transported the full exhaust with a Flex to my friend Matt who was able to weld it back together with a stainless steel welder. He wasn't all too pleased with his work, so I'm not posting the finished work but I think it looks perfect. The process is quite simple. Uninstall the exhaust, cut open the upper side of the the SCR with a side grinder, bash and remove the SCR material, vacuum the remains and weld shut again. The sound is now much throatier and the turbo whistle is quite pronounced. As Persian Whisperjet noted, the smell is a bit different now. A little bit more like the old diesels, but still not very pleasant. At least not with MI diesel. Attached Images
	Appreciate 1 Quote

01-31-2016, 06:03 PM	#204
Persian Whisperjet Kind of a Big Deal 171 Rep 857 Posts Drives: 2011 335d Join Date: Dec 2012 Location: Washington, D.C. iTrader: (0)	Definitely more whistle and grunt with the SCR empty.
	Appreciate 0 Quote

02-01-2016, 03:35 PM	#210
BEWWWM I like to party 45 Rep 126 Posts Drives: 2011 335d Join Date: Sep 2015 Location: Tampa iTrader: (0)	Drive by feel!!
	Appreciate 0 Quote

02-02-2016, 09:17 AM	#215
BB_cuda Brigadier General 779 Rep 3,559 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	If this isn't any trouble, EGT temps under high load are only part of the story. I think TDI was interested (and me too) in EGT data when engine wasn't under much load. In other words, what EGT at idle or when just cruising at 1500 rpm? We are hoping EGT is warm enough there to get scrubbing in normal driving conditions too. We all smell stink parked in driveway or at traffic lights.
	Appreciate 0 Quote

02-02-2016, 09:23 AM	#216
rulonger Lieutenant 111 Rep 529 Posts Drives: 2011 335d E90 & 2010 328i E91 Join Date: Feb 2015 Location: NC iTrader: (0)	I would have to say that my only complaint (and complaints from the family) are about the more pronounced smell after the delete. I am interested in a fix. __________________ 2011 335d Deep Sea Blue on Beige (stock except for the cheap ass wheels from PO) 2010 328i Tasman Green on Saddle (stock)
	Appreciate 0 Quote

02-02-2016, 09:48 AM	#218
CvilleBill Private First Class 24 Rep 110 Posts Drives: 2011 335d Join Date: Jan 2016 Location: Va iTrader: (0)	Diesel fumes make me horny!
	Appreciate 1 Quote

02-02-2016, 03:53 PM	#219
DWR Banned 799 Rep 1,630 Posts Drives: 2009 335d Join Date: Oct 2014 Location: Maine iTrader: (0)	This is one of the things that drove me crazy about tuning gas engines. I could get the engines to run smoothly at AFR of 16:1, but the catalytic converters needed below 14.7 to work their best at idle. Burning more fuel to save the environment just never sat right with me.
	Appreciate 0 Quote