GNAT - Rebuild - The Sequel

Discussion in 'Car Builds, Projects, Idea's Experiments' started by Nathan, May 11, 2015.

  1. DryMartini

    DryMartini New Member

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    Yep, that head is definitely No. 2 now.
     
  2. Norm03s

    Norm03s New Member

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    Will you have those injectors tested and calibrated, I suspect that one. The O2 wire would probably have caused the all the rest to show a lean condition if that were the culprit.
     
  3. Crashton

    Crashton Club Coordinator

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    That cylinder took a #2 all right....
     
  4. Nathan

    Nathan Founder

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    I'd not thought of having the injectors cleaned, tested and calibrated. Chad and Nick are monitoring this thread, their thoughts on this would be beneficial.

    I would have no idea where to have that service performed either. Google offers dozens of choices.
     
  5. cct1

    cct1 Well-Known Member
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    Damn, might be cheaper to buy new injectors, be interesting to see what they charge.
     
  6. Metalman

    Metalman Well-Known Member
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  7. Nathan

    Nathan Founder

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    Less than the cost of one to have this done from the link provided by Metalman

    $22 each
    $10 return shipping
    ----
    $98 + shipping to them.

    Approx 6 day turnaround from receipt to shipped.
     
  8. cct1

    cct1 Well-Known Member
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    That's better than I thought, looks good.
     
  9. TheModFather

    TheModFather Well-Known Member

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    What injectors do you have Nate? Might be worth it to upgrade while the labor is free... ;)
     
  10. Nathan

    Nathan Founder

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    Ummm...

    I think I have 550's
     
  11. Detroit Tuned

    Detroit Tuned Well-Known Member
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    #51 Detroit Tuned, May 27, 2015
    Last edited by a moderator: May 27, 2015
    As promised the video!

    [ame="https://www.youtube.com/watch?v=XNCxM3hpoVU"]NatesHead - YouTube[/ame]

    Sorry about the bad edit. It was quick and by hand.
    Injector testing is never a bad idea. We have the time. :)
     
  12. Minidave

    Minidave Well-Known Member
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    Whadya think - just one of those things? valve just broke? the color looks good on all the valves, doesn't look like it went lean at all.....

    He would have had to have been at full throttle for a long time for it to burn a valve like that - to me. Like doing laps around Texas Motor Speedway or sumthin......
     
  13. Crashton

    Crashton Club Coordinator

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    I'm absolutely astounded the piston in #2 hole looks that good. Even though you have had bad juju with the head it could have been far far worse. Go buy a lottery ticket Nathan, you have a good luck streak going.
     
  14. Norm03s

    Norm03s New Member

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    That cylinder was running lean for sure look at the other valve, same color, lean. Compare to all the others. Maybe the best indicator is the color inside the exhaust ports in the header.
    Idealy, monitoring and tuning the each injector to get the same temp. in each cylinder will get the most performance.
     
  15. BlimeyCabrio

    BlimeyCabrio Oscar Goldman of MINIs
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    I've thought (several times) about installing EGT probes in all four primaries. It really is the best way to do it. But then I think "OMG that's overkill..."

    I'm about to install a single EGT probe at the collector... which provides interesting info, but not really the useful data I'd like to have.
     
  16. Norm03s

    Norm03s New Member

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    The high end tuners dial in each cylinder, what's overkill?
     
  17. BlimeyCabrio

    BlimeyCabrio Oscar Goldman of MINIs
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    Every dollar I spend on that... is a dollar that can't be spent elsewhere... that's all.
     
  18. Eric@Helix

    Eric@Helix New Member
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    When R53s run lean, it's cylinder #4 exhaust valves that melt, not #2. If the motor was running lean (all cylinders), or Nathan was getting no signal from the O2 sensor, he would have seen it on his gauge, which would have been a major red flag (the gauge provides the signal to the VIPEC). You could easily ohm out the wire to see if it is conducting, but based upon the symptoms, It looks to me that the injector is the more likely culprit.
     
  19. WolfGTI

    WolfGTI Active Member

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    Correct - I know that from first hand experience when my meth system failed on me during a tuning run. There is an adjustment in the Vipec where you can change an additional fuel trim for each cylinder to compensate for the differences in flow due to manifold design.

     
  20. Nathan

    Nathan Founder

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    So...

    Does the combined braintrust think I should send the injectors out to be cleaned and tested?

    If so, any recommendations at to where to send them?
     

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