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  1. Replies
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    Great. Thanks for the response

    Great. Thanks for the response
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    6500 to 6600 is what I've been doing with and...

    6500 to 6600 is what I've been doing with and raising limiter a few hundred over on auto to leave a little room if low gear over revs a little but I don't tune a lot of LT4 so was looking to see what...
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    LT4 RPM Limit

    Does there seem to be an RPM where LT4 engines have repeatedly been safe or is past the factory rev limiter pushing it a bit? I have tried to research to see what kind of limiter guys are putting on...
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    O2 sensor wires plugged in backwards or something...

    O2 sensor wires plugged in backwards or something maybe meaning the banks are switched. You said it idles fine until it starts making corrections then freaks out right?
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    I didn't look at tune but this post had me...

    I didn't look at tune but this post had me curious so I looked at the log and I don't think this is a tuning problem but something else going on
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    Exactly... That data clearly isn't intended for...

    Exactly... That data clearly isn't intended for only one set fuel pressure or we wouldn't have the pressure multipliers.
  7. Thread: Fixed MAF

    by tbrtuning
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    2,273

    Use STFT + LTFT instead of LTFT only

    Use STFT + LTFT instead of LTFT only
  8. Part of it is how lean you run it and what cam...

    Part of it is how lean you run it and what cam timing you are running so hard to give generic timing numbers. Personal car you want to push a bit without having to worry much about it you could...
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    I've seen this happen when RPM falls below a...

    I've seen this happen when RPM falls below a certain number. I don't know exactly how low causes it but its maybe 500 or less. I never see them do this after I get them dialed in where RPM isn't...
  10. 185 or a little higher should work good. If you...

    185 or a little higher should work good. If you find the fans running more than you would like just bump it up some and if you want to you could use the ambient to set to like 190 when hot out and...
  11. Change PWM Desired ECT. Notice Fan Type on a...

    Change PWM Desired ECT. Notice Fan Type on a Hellcat is PWM not 2 or 3 Speed Relay. The tables you changed aren't for PWM fan control
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    If it was in that area in 93 when cruising and...

    If it was in that area in 93 when cruising and idling too I would just send log where you're at and keep adding E85. Sounds like on the right track if they dialed it in good on 93 first.
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    What was it reading on 93?

    What was it reading on 93?
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    If tuning your own car and knock sensor...

    If tuning your own car and knock sensor sensitivity is pretty close or a bit too sensitive you can also somewhat overlook the short term and watch for long term then pull timing where you see long...
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    You are correct that they do that with learned...

    You are correct that they do that with learned knock. You can log long and short term for the knock retard to see if it's learned
  16. Give more Driver Demand percent at the low area....

    Give more Driver Demand percent at the low area. Until you slow down to the mph where it transitions to adaptive idle it is going to use Driver Demand. If you pull out nice and slow you probably will...
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    Might be real knock then. Another reason I think...

    Might be real knock then. Another reason I think it might be is that you said when you added more fuel you got less knock. You probably are just at the limit of 91 octane. Cam timing change can help...
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    It's a bit difficult to say without seeing logs...

    It's a bit difficult to say without seeing logs before and after timing changes or with higher octane as a test. Stock knock sensors might be a bit too sensitive if you're getting much extra noise...
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    AFR and timing are kind of relative to each...

    AFR and timing are kind of relative to each other. You can safely run really lean if you don't have too much timing in it. I'm not on the computer right now to look at log. Just run it on several...
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    Try taking a couple degrees of timing out and...

    Try taking a couple degrees of timing out and leaning it out to maybe 0.88 for a pull also
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    Sadly a dyno isn't going to help you tune spark...

    Sadly a dyno isn't going to help you tune spark on a knock limited setup very much. You're not tuning for peak power you're tuning against an octane limit. Be cautious too because depending on the...
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    You can change the torque and airflow models to...

    You can change the torque and airflow models to make indicated torque higher but not really much point. Sometimes it even causes you to get to torque limits you would never hit if you don't mess with...
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    Absolutely. It's just a number and doesn't have...

    Absolutely. It's just a number and doesn't have to reflect power. If I change displacement doing a stroker it seems aircharge goes up, but if you leave displacement stock and just add extra fuel...
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    Thinking about it and Hellcat is a good example...

    Thinking about it and Hellcat is a good example of this being calculated... Every year and operating system doesn't calculate the same aircharge. Might have two cars running the exact same setup and...
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    It's a calculation in PCM but if you have same...

    It's a calculation in PCM but if you have same tune and mods to increase MAP you should see higher aircharge as well. I know aircharge gets over 2.0 if you put a lot of boost to one. Typical bolt on...
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