Unplugging EGR vs. EGR Delete

Discussion in 'Mazdaspeed 3/6 Engine' started by ejb2112, Apr 8, 2016.

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  1. ejb2112

    ejb2112 Greenie Member

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    With the EGR unplugged, will it still eventually get gummed up? If so, how do I keep a watch for that? @PURPFOX says BAT's will go up. Are there other indicators I would be able to see on my AP?
     
  2. Raider

    Raider Administraider Administrator Platinum Member

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    Well if EGR is closed, will BATs will go down since no more hot air into intake. And it is safe to say all the crap that is usually flung through it, will get backed up onto the piston.
     
  3. ejb2112

    ejb2112 Greenie Member

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    Well, that doesn't sound good. :)
     
  4. onlyicansee

    onlyicansee Greenie N00B Member

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    So after unplugging the egr. I only throw p0403 not p0401also my stutter under boost seems to have disappeared. Denso ivt22s are going in this weekend just to be safe.

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    onlyicansee, via a mobile device, Apr 15, 2016
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  5. Raider

    Raider Administraider Administrator Platinum Member

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    make sure you gap them. .026-.028.
     
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  6. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    ^^^ this
    And some people say to avoid Densos like the plague due to bits falling off the plugs into the cylinder. NGK IXs are regarded as one of the best, FYI.
     
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  7. onlyicansee

    onlyicansee Greenie N00B Member

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    I will definitely be regapping them.

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    onlyicansee, via a mobile device, Apr 15, 2016
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  8. 78jdbronco

    78jdbronco Greenie Member

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    for some reason, i was thinking that EGR delete actually raised BATs...which seems counter intuitive but that's why it stuck.
     
  9. 5doorsoffury

    5doorsoffury Greenie Member

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    When i had mine unplugged i would get a random misfire code. I had this issue for a long time until i deleted the egr with a basic 20$ delete. That fixed my random misfire. Once i "got a guy" for inspections NCE on visual stuff so that motivated the delete as well as a pima time cleaning my valves.
     
    5doorsoffury, via a mobile device, May 10, 2016
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  10. SCSI15

    SCSI15 Greenie Member

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    @ejb2112 did you notice your bats go down or have any issues as of late?
     
  11. onlyicansee

    onlyicansee Greenie N00B Member

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    Bats are bueno and no problems since unplugging.

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    onlyicansee, via a mobile device, May 11, 2016
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  12. ejb2112

    ejb2112 Greenie Member

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    I had Justin tune for the unplugged EGR, and my BAT's are normal and no codes have been thrown.
     
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  13. Brandon_Clark

    Brandon_Clark Greenie Member

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    So fwiw, a loophole my bro in law told me about concerning emissions here in Wilson county, tn. His jeep as had a CEL for as long as he's owned it. A month before his tags expire he goes to the county clerk, changes his vehicle class for a few bucks more than tags alone and they give him a new plate with fresh tags. So I'll be doing that since I'm gonna de-cat mine.

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    Brandon_Clark, via a mobile device, Jun 16, 2016
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  14. Captain KR

    Captain KR Greenie Member

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    Not to derail but unplugging the egr works great in conjunction with a coolant bypass. The only thing that is needed for that is a 3/8th barb union and is completly reversible. Or you can just reroute the primary line that leads to the water neck down to black coolant pipe that sits where the trans and block meet. In serious situations where some customers have seen 140-150* bats i have seen the temps drop to 120-130*, rise slower, and rebound faster on cruise. (coolant bypass and egr delete/unplug performed at the same time)
     
    Captain KR, via a mobile device, Jun 16, 2016
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  15. Fstrnyou

    Fstrnyou Greenie Member

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    Correct me please if I'm wrong, but with the EGR piston closed, there is no flow. Without flow, there is nothing to carry the junk to the piston.
     
    Fstrnyou, via an iPad, Sep 5, 2016
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  16. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    Correct. The default, unenergized EGR position is closed. That's why I run unplugged most of the time. To me, I see no need to EGR delete unless you need the extra room for a bigger turbo, like a MUCH bigger turbo. My EGR is still intact with my BNR S3.

    And I can't say for sure, but I'd agree with you about the flow not going to the EGR portion of the EM. All of the exhaust would head into the turbo. That seems to make sense.
     
    Last edited: Sep 5, 2016
  17. tarnumf

    tarnumf Greenie Member

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    There is some small flow from IM vacuum/boost cycles plus vibrations, so junk can be carried down from EGR tube.

    100 thousand words miles:

    [​IMG]
     
    Last edited: Sep 6, 2016
  18. Raider

    Raider Administraider Administrator Platinum Member

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    Plus if it is gummed up, the EGR is not fully closed to begin with. Full EGR is not much $ for the full delete. No worries then.
     
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  19. Awafrican

    Awafrican Silver Member

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    I did my full delete, it's not like it's hard to put back on for emissions, one less thing for coolant to flow through
     
    Awafrican, via a mobile device, Sep 6, 2016
    #39
  20. neganox

    neganox Feline Führer Moderator Platinum Member

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    I like it when coolant spills all over my engine bay and/or face.
    [​IMG]
     
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