Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You

Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI (Diesel) Emissions

TDI (Diesel) Emissions This is a discussion about emissions from TDI's. Pro's cons of Diesels (including biodiesel) effects on the environment and how they compare to Gasoline and other fuel sources for Internal combustion engines.

Thread Tools
Old July 16th, 2018, 13:14   #31
Join Date: May 2018
Location: Los Angeles

Darkside Developments in the UK makes a universal fit race DPF; would love to hear if anyone has tried it or something similar.
Pittdawg is offline   Reply With Quote
Old July 16th, 2018, 13:15   #32
Join Date: May 2018
Location: Los Angeles

Originally Posted by VeeDubTDI View Post
A stage 2 without DPF delete and a stage 2 with DPF delete are only about 5 horsepower difference. I wouldn't consider that a dramatic increase in power output.
That's contrary to almost every post that claims the DPF is the limiting factor; where did you get this info?
Pittdawg is offline   Reply With Quote
Old July 16th, 2018, 14:57   #33
Veteran Member
crazyrunner33's Avatar
Join Date: Jul 2006
Location: Charlotte, NC

Originally Posted by Pittdawg View Post
That's contrary to almost every post that claims the DPF is the limiting factor; where did you get this info?
The DPF isn't as limiting as you'd imagine. A SCR equipped Cummins with the DPF and a deleted Cummins experiences zero measurable increase in fuel economy. The DPFs flow pretty well if they aren't clogged, the big kicker is the EGR usage which isn't much of an issue on an SCR equipped diesel engine. The stock turbo is the biggest limiting factor. And DPF clogging typically isn't an issue on SCR equipped engines or ones with the EGR disabled.
'06 Jetta DSG: GTB1749VC, PD150 injectors, Malone tune, and some other stuff and things
'97 Cummins: It looks stock, does that count?
crazyrunner33 is offline   Reply With Quote
Old July 16th, 2018, 15:05   #34
Moderator at Large
Join Date: Jun 1999
Location: Brampton, Ontario, Canada

A DPF needs to be close-coupled to the engine in order to minimize the need for active regeneration.

Look at where it is on a VW EA288 or on the latest M-B 4-cylinder engine. The path from the exhaust ports to the turbo to the catalyst is as short as possible and the DPF is in the same enclosure as the oxidizing catalyst.

That's not going to happen if you have connections and fittings in between, and it's not going to happen if you position the catalyst under-floor (as with the original layout of the VW common-rail TDI).

If it's tied directly to the engine, it heats up as quickly as possible and the operating temperature could reach the regeneration threshold during normal driving more frequently.
Brian P.
formerly ... 2006 Jetta TDI 5-sp, Spice Red, Unitronics stage 1, 0.681 5th gear.
and before that ... 1996 Passat TDI, Silk Blue
GoFaster is offline   Reply With Quote
Old July 16th, 2018, 17:30   #35
KERMA's Avatar
Join Date: Sep 2001
Location: here

Stock size is fine

Frankly the DPF is not an impediment to power IMO so really not much to gain here, other than the possiblility of a more reliable unit.

SO if you have a chance to design an upgraded DPF, I would replace the original cordierite filter element with a silicon carbide filter medium. It will cost more than stock VW, but will not crack as it is rated for much higher temperatures

You would also need to remember the nox catalyst if you want to have a chance at compliance

If you want it to work "correctly" there are some changes needed to the ecu internal model. Can't just slap on an extra injector or something hillbilly
HP is for show, TQ is for go.
celebrating http://www.kermatdi.com since 2002
kermatdi on facebook
No, no, you're not thinking; you're just being logical. - Neils Bohr
KERMA is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
2010 CR 2.0 TDI DSG Mechatronics unit failure Specialized VW MKV-A5 Golf/Jettas 3 April 18th, 2014 18:50
2.0 cr tdi DPF delete 3inch down pipe Spencerhoag Private TDI Items for Sale/Wanted 3 January 18th, 2014 09:04
[FS] 2.0 CR TDI Downpipe w/Diesel Particular Filter (DPF), EGR + Cats Shaeet Private TDI Items for Sale/Wanted 3 October 28th, 2013 14:32
Is this how Passive Regeneration in the DPF works? HumbleSmoker TDI (Diesel) Emissions 1 January 29th, 2009 07:16

All times are GMT -7. The time now is 05:45.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2017, All Rights Reserved
Page generated in 0.15592 seconds with 13 queries
[Output: 71.79 Kb. compressed to 63.72 Kb. by saving 8.07 Kb. (11.24%)]