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Thread: Reduced engine Power

  1. #1
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    Default Reduced engine Power

    Base_0018.tunLog_0219.efi

    I have done a few different searches, but I cannot seem to find an answer to my issue. I have a 2003 C5 witha supercharger and after two pulls on the chassis dyno or one good wot on the street she goes into Reduced engine Power. Any ideas?? I will try to post a log later tonight.

    W~
    Last edited by Webbs; January 31st, 2011 at 12:25 PM. Reason: Logs and tune added

  2. #2
    Lifetime Member minytrker's Avatar
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    My first guess would be table C6101 Predicted Airflow. Did you increase the values of that table? Post you tune along with you log.

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    Log and tune added

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    Quote Originally Posted by minytrker View Post
    My first guess would be table C6101 Predicted Airflow. Did you increase the values of that table? Post you tune along with you log.

    C6101 is Maxed.

  5. #5
    Lifetime Member limited cv8r's Avatar
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    Was this tune supplied with the supercharger?
    I noticed that C3004-predicted Map Min has all been set to 105Kpa.I'm not sure how the PCM would interperate that but this is the explanation in the software:
    "For a given RPM and throttle percentage, it is expected the MAP sensor will not read less than this amount."
    Considering by the looks of it you are using a 1 bar sensor, you will always read lower than 105Kpa.

    Standard tune attached that I used for a quick compare.
    It's all good until it goes "Bang"

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    I see what you are talking about. It really does not make sense. I will give it a go.

    Thanks,

    W~

  7. #7
    Lifetime Member minytrker's Avatar
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    You are maxing out the MAF. Thats causing your reduced power. You can go to 2/3 bar setup or do the re-scaling of fuel & spark tables. I would switch to 2/3 bar and COS#3.

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    Quote Originally Posted by minytrker View Post
    You are maxing out the MAF. Thats causing your reduced power. You can go to 2/3 bar setup or do the re-scaling of fuel & spark tables. I would switch to 2/3 bar and COS#3.
    Can I use the MAF and a 2/3 Bar? Also is there anyway to go around this? Or am I stuck with RAP?

    W~

  9. #9
    Lifetime Member limited cv8r's Avatar
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    The 2/3 bar will only allow you to see manifold pressure above 105Kpa, which will let you map your boost properly, but your maf will still peg out at 512g/s.
    It's all good until it goes "Bang"

  10. #10
    Lifetime Member minytrker's Avatar
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    Thats correct, I forgot to add 2/3 bar SD or rescale the tables if you want to use same maf. Or the last option would be a bigger maf.

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