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Thread: EGR Re-Mapping Out

  1. #1
    Regular Member WeDesign's Avatar
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    Vehicle : Vectra

    Trim : Design

    Engine : CDTi 150

    Year : 55

    Default EGR Re-Mapping Out

    Other than the re-map is there anything else that needs to be done, I will not be taking the DPF out?

    Can it stay in place, it currently has a blanking plate with 3 6mm holes drilled in it.?



    Regards.

  2. #2
    Regular Member Penfold101's Avatar
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    Once it's mapped out that's it mate - you just need to fit a complete blank so no crap gets in, but you can't remove the valve completely as the system still needs to know it's there, it just doesn't open it...

  3. #3
    Regular Member WeDesign's Avatar
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    Vehicle : Vectra

    Trim : Design

    Engine : CDTi 150

    Year : 55

    Default

    Quote Originally Posted by Penfold101 View Post
    Once it's mapped out that's it mate - you just need to fit a complete blank so no crap gets in, but you can't remove the valve completely as the system still needs to know it's there, it just doesn't open it...
    Cheers for that.

    Will the car still do a re-gen of the DPF?

  4. #4
    Regular Member Penfold101's Avatar
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    I don't see why not - I've no idea if the EGR is involved in the DPF cycle software but I don't see why it would be...

  5. #5
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    Trim : Sri nav

    Engine : Z19dth

    Year : 2006

    Default

    You'll find that if you blank/partially blank, or even have a sticky egr valve, your DPF will fill up quicker. It's not recommended to anything to block the egr off unless you've removed the DPF and removed its function from the ECU.

  6. #6
    Regular Member Teapot's Avatar
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    Vehicle : Signum

    Trim : Design+

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 101000

    Default

    Quote Originally Posted by mally View Post
    You'll find that if you blank/partially blank, or even have a sticky egr valve, your DPF will fill up quicker. It's not recommended to anything to block the egr off unless you've removed the DPF and removed its function from the ECU.
    Actually thats not quite true;

    With faulty EGR valve (e.g. sticking open) there may be more soot emission due to exhaust gas being recirculated when it shouldn't be (e.g. at full throttle) resulting in an oxygen-depleted intake charge which will cause more soot and hence will fill the DPF more quickly.

    With fully disabled/blanked EGR, there will be LESS soot emission because there is more oxygen in the intake charge. EGR's only purpose is to slow down the burn rate which reduces the peak combustion temperature and hence NOx emissions.

    I've been running with EGR disabled but DPF still working for some time now without any problem - it has regenerated a couple of times without issue. If anything it seems to be going further between regens. I'm planning to remove the DPF in the spring though...

  7. #7
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    Trim : Sri nav

    Engine : Z19dth

    Year : 2006

    Default

    Why remove the DPF if its running ok?

  8. #8
    Regular Member Penfold101's Avatar
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    Quote Originally Posted by mally View Post
    Why remove the DPF if its running ok?
    Because it's only there as an emissions regulations device, and was fitted because some of the engine/model combinations didn't meet the required levels, ie estates, automatics and Signums. You can find a manual Vectra which doesn't have one fitted but is the same age and engine and gets in under the required level to meet Euro 4 emissions. This alone proves it's just for that purpose, and they weren't fitted to actually do anything useful. It just wastes fuel and causes problems, nothing else.

    Rant over.

  9. #9
    Regular Member Teapot's Avatar
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    Year : 2007

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    Default

    exactly - it reduces performance and fuel economy generally, due to being a restriction.to gas flow on the exhaust. then to add insult to injury the engine wastes approximately half a gallon of fuel every 500-1000 miles to create enough heat to burn off the collected soot.

  10. #10
    Regular Member WeDesign's Avatar
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    Vehicle : Vectra

    Trim : Design

    Engine : CDTi 150

    Year : 55

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    If I unplug tge EGR Valve will the car still perform Regen?

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