Surge, not the refreshing drink.

Discussion in 'Generation 4 - Maintenance & Troubleshooting' started by skyshadow07, Apr 18, 2021.

  1. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    I have noticed a problem now that speed season has opened back up. My car has a surge or skipping slipping feeling when WOT at high rpm, right before shifts. I tested today and found the effect is not present when the trans is only 100ish degree. But I begin to feel it more as the trans warms up. When the trans is 135ish deg, I feel it hard between 2nd and 3rd. I also found a wet spot on the top of my trans. When I do a pull, I can lightly smell burning oil or maybe trans fluid, my sniffer sucks. Any ideas? I know surging can be everything from a lean condition to a torque converter to a sensor to possible condensation in my WAY over sized intercooler.. it could be a million things, which sucks. I added a video to help you understand where the wet area is on the trans.

    https://photos.app.goo.gl/89HwubomkLHdx1N66
     
  2. FiveLeeter918

    FiveLeeter918 Ortiz Performance Sales Sponsoring Vendor

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    Any torque source codes when it happens?
     
  3. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    codes? like check engine codes? None of those if that's what you mean.
    Torrie looked at some logs and said my fuel pressure was all over the place. My concern is this is a tune that's over a year old. Why is the fuel pressure just now becoming wonky? You think maybe the low pressure fuel pump is not pushing the proper amount of volume?
     
  4. FiveLeeter918

    FiveLeeter918 Ortiz Performance Sales Sponsoring Vendor

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    not CEL, you can log a PID called "Torque Source" that will note the reasons why throttle closes under load. Is throttle fluttering on the log at all?
     
  5. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    I can email you logs if you want. Even though I am an engineer, you guys are the real wizards with this stuff. I am not sure I am even logging the proper parameters.
     
  6. stripSHO

    stripSHO Tyler Durden

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    You could just attach them as a .zip to this thread too. I’d be willing to take a looky
     
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  7. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    Any specific parameters I should be logging?
     
  8. stripSHO

    stripSHO Tyler Durden

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    Are you using HPTuners or SCT? Just toss up what you got and go from there. Or pm me for email if you’d prefer that way
     
    Last edited: Apr 22, 2021
  9. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    Here are three logs, the surging came on harder with each log, 01 being the least, 03 being the most.
     

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  10. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    here are two more logs from after he reduced the boost to account for fuel pressure. The second log is on meth (20m/80w blend).
     

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  11. stripSHO

    stripSHO Tyler Durden

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    So your boost pressure seems really jittery across all these logs IMO, but in log 3 it comes completely off the rails. You can see the throttle opening/closing to try and maintain load as boost is swinging 2-3 psi. I can't see your trans causing this but I'm no expert. Seems to really struggle through 2nd gear where you are targeting far less boost but smooths out as soon as you get into 3rd and start loading up. Looks to me like a problem with the wastegate controls.

    If it were my car, I'd be checking all wiring and tubing relating to the wastegate controls for cracks or leaks. Check out linkages, rumor has it they're prone to coming loose! Then I'd probably use a hand air pump to manually stroke the wastegate actuators, making sure they move freely & smoothly, and that the each respond equally to a given pressure input. Beyond that, ya got me.

    I'm guessing that these logs came from an ngauge. I read those apparently have a 23 PID limit which is tough; I typically log 60 or so. But of the ones that are available, these are probably the most helpful to log for your current situation. In normal circumstances I would probably drop the bottom four and put back in the stft and ltft for each bank.

    boost
    rpm
    ect
    iat2
    oar
    commanded equivalence ratio
    spark total
    torque source
    knock
    lambda 1
    lambda 2
    load
    etc actual
    etc desired
    hpfp duty cycle
    fuel rail pressure
    TIP
    TIP desired
    wgdc
    speed ratio across tc
    trans slip ratio
    trans fluid temp
    trans pressure
     
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  12. skyshadow07

    skyshadow07 On a mission to get below 4000lbs

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    Good info. I have a massive (24x12x4) FMIC. You think that could be causing the pressure problem? I'll check the wastegates and do I leak test.
     
  13. stripSHO

    stripSHO Tyler Durden

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    I dunno. Maybe if it's got a gallon of water sitting in it?
     

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