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Thread: Are you able to completely turn off closed loop lamda.

  1. #1
    Advanced Tuner
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    Are you able to completely turn off closed loop lamda.

    I can't switch it off completely.

    I have set the "open loop TPS threshold" to 0% and I have put "closed loop sensor temp" to 2300 deg but then it will still operate at idle.

    I want to tune completely in open loop.

    Is there a way to do this??

    I have also switched the number of O2 sensors to zero but then the car does not start at all???

    This is tuning on Aussie Ford.
    Last edited by turbotrana; 05-22-2014 at 01:40 AM.

  2. #2
    Senior Tuner SultanHassanMasTuning's Avatar
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    if you have the O2 sensors off the car will not start, have the front ones on
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  3. #3
    Tuner in Training
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    I max out the closed loop delay, then it will idle in open loop so you can tune it.

  4. #4
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    Quote Originally Posted by SultanHassanMasTuning View Post
    if you have the O2 sensors off the car will not start, have the front ones on
    I had the O2 sensor on and switched it off in the software. No start

  5. #5
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    Quote Originally Posted by zc347 View Post
    I max out the closed loop delay, then it will idle in open loop so you can tune it.
    I have done that also but I want it switched off.

    I am running E85 and this fuel needs to be run leaner than stoich in the driving areas of the map.

  6. #6
    HPT Employee Eric@HPTuners's Avatar
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    You can adjust the bias to get a leaner mixture in closed loop. I've never had any issues with running E85 at stoich though.
    Eric Brooks
    HP Tuners, LLC

  7. #7
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    Much better fuel economy and the engine likes it running much leaner than stoich in normal driving with E85. E85 seems to have a much larger tuning window compared to normal gas.

    Did try the Bias about a year ago with no success. Was using the the lc-1 to give the bias.

    So I take it can't completely switch it off.

  8. #8
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    There is no switch. It's bizarre!

  9. #9
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    It would be good if Eric could put a switch in.

  10. #10
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    It falls into the same category as the t-MAP calibration!!