User Tag List

Thanks Thanks:  0
Likes Likes:  0
Results 1 to 10 of 10

Thread: MOT, EGR and CRD2

  1. #1
    Regular Member spatch's Avatar
    Join Date
    Aug 2007
    Location
    Kent
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default MOT, EGR and CRD2

    Just thought I would pass on this bit of info. I have just had my Vecta MOT'd, which it marginally failed on the smoke test - the limit is 3l/m and I was getting about 3.1l/m. I decided to unplug the CRD2 box (running map4 0%) and it immediately dropped to an average of 1.2l/m. Conclusion - there has been talk on this forum that the use of the box would not affect the MOT test results, however, it certainly does.

    Additionally, I have my EGR restricted. The previous years MOT smoke test figures (where EGR was not restricted) averaged 2.9l/m which only just passed. This year, as mentioned above, was 1.2l/m. There were no other differences in car set up (apart from it being a year older). This is just an observation but this does seem to prove what we have discussed previously that restricting the EGR flow does reduce smoke.

    Cheers,

  2. #2
    Regular Member Blagmeister's Avatar
    Join Date
    Nov 2008
    Location
    Warks
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Great Post

    Thanks for the heads up. Can you explain how you have restricted your EGR valve please?

  3. #3
    Regular Member spatch's Avatar
    Join Date
    Aug 2007
    Location
    Kent
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Quote Originally Posted by Blagmeister View Post
    Thanks for the heads up. Can you explain how you have restricted your EGR valve please?
    Inserting a plate with 2 off 5mm holes at the joint between the plenum chamber and corrugated pipe. Also, as per this post - http://www.vectra-c.com/forum/showthread.php?t=51953

    Originally I blanked the EGR system, but others who did this had warning lights appear due to low EGR flow. Restricting it has not caused any warning lights so seems to be the way to go.

    Cheers,

  4. #4
    Regular Member Ste's Avatar
    Join Date
    Jul 2005
    Location
    ..... Driving the Jaguar XF
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats

    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default

    Restricting EGR will always reduce smoke, as combustion temp will be hotter = more complete combustion = less soot / smoke. But it means higher NOx output

  5. #5
    Regular Member spatch's Avatar
    Join Date
    Aug 2007
    Location
    Kent
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Quote Originally Posted by Ste View Post
    Restricting EGR will always reduce smoke, as combustion temp will be hotter = more complete combustion = less soot / smoke. But it means higher NOx output
    Indeed, and is exactly what we have been discussing about the pros and cons of EGR isolation over the past year. This, however, is the first non-theoretical evidence I have seen.

  6. #6
    On a Sabbatical
    Join Date
    Aug 2006
    Location
    EVERYWHERE
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Quote Originally Posted by spatch View Post

    Originally I blanked the EGR system, but others who did this had warning lights appear due to low EGR flow. Restricting it has not caused any warning lights so seems to be the way to go.
    It needs a hole there so that the sensor can detect a change in pressure.

    And with regard to the 'smoke test'-exactly how much more additional fuel do you think you were burning (or not burning,as the case may be) for that extra few bhp! ?

  7. #7
    Regular Member spatch's Avatar
    Join Date
    Aug 2007
    Location
    Kent
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Quote Originally Posted by diesel dog View Post
    It needs a hole there so that the sensor can detect a change in pressure.
    Exactly, hence in my second post I said there were 2 off 5mm holes in the plate to restrict flow.


    Quote Originally Posted by diesel dog View Post
    And with regard to the 'smoke test'-exactly how much more additional fuel do you think you were burning (or not burning,as the case may be) for that extra few bhp! ?
    I have no idea how the amount of smoke produced relates to the amount of fuel burned. Obviously it is burning more fuel, but note the fact that the smoke test results of "no CRD2/open EGR" (i.e standard) combo and "CRD2/restricted EGR" combo gave similar values. The conclusion here is that the "CDR2/restricted EGR" combo produces no more smoke than the standard setup.

    I am reliably getting 37mpg average and this is mainly A/B road driving, motorways it is more like 45mpg. I am happy with that.

  8. #8
    On a Sabbatical
    Join Date
    Aug 2006
    Location
    EVERYWHERE
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Quote Originally Posted by spatch View Post

    I have no idea how the amount of smoke produced relates to the amount of fuel burned. Obviously it is burning more fuel, but note the fact that the smoke test results of "no CRD2/open EGR" (i.e standard) combo and "CRD2/restricted EGR" combo gave similar values. The conclusion here is that the "CDR2/restricted EGR" combo produces no more smoke than the standard setup.
    Any full throttle/load tests are likely to cause the EGR valve to close,so it doesn't really add up that the valve affects the smoke test result.

  9. #9
    Regular Member spatch's Avatar
    Join Date
    Aug 2007
    Location
    Kent
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Quote Originally Posted by diesel dog View Post
    Any full throttle/load tests are likely to cause the EGR valve to close,so it doesn't really add up that the valve affects the smoke test result.
    A valid point regarding full throttle and EGR, however, the fact still remains that I have practical evidence of the amount of smoke produced. I am still not convinced I/we fully understand the complete workings of the EGR system and how it interacts with the rest of the engine.

    In any case, I only posted for info.

  10. #10
    On a Sabbatical
    Join Date
    Aug 2006
    Location
    EVERYWHERE
    Problems Posted
    0
    Problems Solved
    0
    Best Answers
    0
    Good Answers
    0
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Vehicle InfoStats





    Default

    Quote Originally Posted by spatch View Post
    I am still not convinced I/we fully understand the complete workings of the EGR system and how it interacts with the rest of the engine.
    Too true.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. difference between a DTUK CRD2 (09) & CRD2 Multi-Map®?
    By Beckman in forum Diesel Engine related
    Replies: 2
    Last Post: 10th December 2010, 22:49
  2. Which map do i use on my crd2 box
    By PAULMAC77 in forum Diesel Engine related
    Replies: 1
    Last Post: 10th February 2009, 11:40
  3. which map are you using on the crd2?
    By philipsmith in forum Diesel Engine related
    Replies: 1
    Last Post: 2nd February 2008, 09:57
  4. CRD2 box
    By willc01 in forum Diesel Engine related
    Replies: 3
    Last Post: 12th December 2006, 23:10

Visitors found this page by searching for:

Nobody landed on this page from a search engine, yet!

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •