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  1. #1
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    Has anyone had DPF issues as result of a remap?

    Hello!

    Keep it simple, as title says.

    Be very interested if my theory of a mapped car, more/over fuel can cause issues with the luvley dpf on the A3!

    Many thanks

    CB

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  3. #2
    Dannykn9's Avatar
    "Cruise My Ride"

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    VCDS Owner-North London/Enfield
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  4. #3
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    What happened with yours then mate?

  5. #4
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    You said to keep it simple, lol.

    Had mine mapped by AmD, nothing wrong with the map, but the 170's are only worth having a map if you have had your DPF removed.
    Basically, when the car is doing a re-gen the exhaust has to get up to a certain temp before the soot can be burned off, so this requires high revs.
    Now with a map, you are using more torque and less revs, hence better fuel economy. But less revs means lower exhaust temp, and resulting in harder to burn off soot, thus blocking the DPF and the light coming on more frequently.

    I only ever got the first warning and easily cleared with a quick blast, but it got to that point it was coming in every 3-4 days and that was with mixed road driving.

    Since having it removed, I hardly get the light on, maybe 1-2 times a month. But I can always tell when my car is doing a re-gen, so take it for a high rev drive above 50 as soon as, even if the light has not come on.
    VCDS Owner-North London/Enfield
    " To Cruise Is What I Do"


  6. #5
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    Funny guy :P

    Oh right cheers mate, but, how come the dpf light comes in if its been removed?!

  7. #6
    wesmaster's Avatar
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    Possibly not mapped properly.

  8. #7
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    Quote Originally Posted by Cossie_boy View Post
    Funny guy :P

    Oh right cheers mate, but, how come the dpf light comes in if its been removed?!
    Sorry mate, should have explained better, since I had my map removed. Not had my DPF removed, yet! ;-)
    VCDS Owner-North London/Enfield
    " To Cruise Is What I Do"


  9. #8
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    Aha, suddenly all becomes clear...

    This is possibly what I have going on then

    Is your driving in London in traffic then mate?

    To work im going about 15 minutes on a road, mostly 50-70, before I get to work it on 1/2 temp on guage

  10. #9
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    Have a look here for some info on DPF, how it works, when it regens and why it doesnt regen.

    Frequently Asked Questions | Honest John
    Angelwax/BBS/BCS/Bilstein/Cobra/CTS Turbo/DTUK/H&R/K-Sport/KW/Loba/Milltek/Shark Performance/Oz Racing/TPI/VCDS/V-Maxx/Vossen/Wagner

  11. #10
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    Quote Originally Posted by Brodster View Post
    Have a look here for some info on DPF, how it works, when it regens and why it doesnt regen.

    Frequently Asked Questions | Honest John
    Nice find Mark,

    Think that deserved to be a sticky??!!
    VCDS Owner-North London/Enfield
    " To Cruise Is What I Do"


  12. #11
    Rick @ Unicorn Motor Dev.'s Avatar
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    You can take a 170 to 185 with the DPF still in place and it will be as reliable as std. Over this, the air/fuel ratio becomes richer and so more particulates are generated causing it to block up.

    Rick
    Unicorn Motor Developments. Bespoke Calibration and Remapping Services
    www.unicornmotordevelopments.com

  13. #12
    Dannykn9's Avatar
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    Quote Originally Posted by Rick @ Unicorn Motor Dev. View Post
    You can take a 170 to 185 with the DPF still in place and it will be as reliable as std. Over this, the air/fuel ratio becomes richer and so more particulates are generated causing it to block up.

    Rick
    Agree with what you say Rick, but £400 or so for an extra 15bhp, depending where you go, not really worth it, even if it does slightly smooth out through the range.

    Best bet, is a complete DPF removal and remap, which I am seriously considering. And if you was not so far away from London Rick, then would consider you to do it as I keep hearing good things about your company mate :-)
    VCDS Owner-North London/Enfield
    " To Cruise Is What I Do"


  14. #13
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    When you say block up, how blocked can they be and still run?

    I'm pretty sure mine is badly blocked due to possible crappy maps, but concerned the garages want to just keep doing forced regen

  15. #14
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    I ran a mapped TT tdi from new for 3 years, travelled 14 miles a day in it (country roads) and never once had the DPF light on. The TT was rollered at 210 BHP and no soot at the back either (DPF left on), the car was a dream to own and drive, I'm still struggling to understand the horrer DPF stories. All I can say is I used the full rev range when I could
    IceHanger
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  16. #15
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    If only mate, lol

    I guess there are lots of other factors when u buy the car second hand though, how its been driven, looked after, fuelled etc...

    Quote Originally Posted by IceHanger View Post
    I ran a mapped TT tdi from new for 3 years, travelled 14 miles a day in it (country roads) and never once had the DPF light on. The TT was rollered at 210 BHP and no soot at the back either (DPF left on), the car was a dream to own and drive, I'm still struggling to understand the horrer DPF stories. All I can say is I used the full rev range when I could

  17. #16
    Flat Out

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    (I ran a mapped TT tdi from new for 3 years, travelled 14 miles a day in it (country roads) and never once had the DPF light on. The TT was rollered at 210 BHP and no soot at the back either (DPF left on), the car was a dream to own and drive, I'm still struggling to understand the horrer DPF stories. All I can say is I used the full rev range when I could)

    Bet that was a CR engine and not a PD

  18. #17
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    Quote Originally Posted by IceHanger View Post
    I ran a mapped TT tdi from new for 3 years, travelled 14 miles a day in it (country roads) and never once had the DPF light on. The TT was rollered at 210 BHP and no soot at the back either (DPF left on), the car was a dream to own and drive, I'm still struggling to understand the horrer DPF stories. All I can say is I used the full rev range when I could
    Bet that was a CR engine and not a PD.

  19. #18
    IceHanger's Avatar
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    yupx2

    So DPF issues tended to be PD engines then?
    IceHanger
    2011 S3 8P 5DR Black edition,
    2013 TT TDi BE with lots of toys
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    Audi S4 B6 4DR Big fuel bill edition
    Audi TT TDi S-line Quattro
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    MGF VVC,
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    Alfa 33 Cloverleaf,
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  20. #19
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    I had a 2008 Golf 170 DPF GT Sport, and never, ever had DPF issues with it, and that was in 44,000 miles. It wasn't mapped, but it was never the DPF horror story car.

    Ok, it was my car for business/domestic, and my business miles were spent mostly on long journeys (180 mile round trips).

    I can't see why a mapped car, doing long distance work, would ever cause any DPF issues.

  21. #20
    Rick @ Unicorn Motor Dev.'s Avatar
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    It can cause issues because a mapped car will produce more particulates, therefore more likely to block the filter

    Rick
    Unicorn Motor Developments. Bespoke Calibration and Remapping Services
    www.unicornmotordevelopments.com

  22. #21
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    I ran mine with the DPF in place for 20k and initially did short journeys before longer commutes. Never once had an issue and the car was running approx 195bhp

    DPF issues tend to arise because the sensors fail and people ignore the warning light and try to drive as per the manual. IMO this only causes further problems as if you have a failing sensor all you actually doing is filling the DPF up!!
    Now a happy owner of an A3 Sportback S Line 170 TDI
    My Posh Golf

 

 

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