[SOLVED] Adjusting throttle response

Discussion in 'Car Modding' started by toebee, Feb 22, 2017.

  1. toebee

    toebee Member

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    From my understanding of the engine file we have a way to control how quickly the engine rpm falls in neutral. Is there a way to control how quickly an engine can rev up while in neutral? My current engine seems to rev up extremely fast but falls normally.
     
  2. Navigator

    Navigator Registered

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    I suggest to play around with engine inertia. That one makes it rev up slower and if returning is to slow, you can look at the throttle fraction and/or back torque.

    Edit:
    RPMBase=( 0, -17.5, -17.5, 0.082, 1.207) // rpm, coast torque, reference max torque (assuming VolumeFract=1.0 & MixtureFract=1.0), idle function (throttle opening to maintain idle RPM), pressure power (power increase above reference air pressure relative to coast torque)

    I mean the fourth value; 0.082
    You keep the engine at an idle rpm with this value.
    When the same values for higher rpm lines "give some", the engine will get a bit of fuel and rev back slower.
     
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  3. toebee

    toebee Member

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    I am having a hard time understanding that in my head. When I get the time I will try messing with it. Thanks!
     
  4. Navigator

    Navigator Registered

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    Its not that hard as you may think.
    Engine inertia; lets say this is how "light" the engine is inside and how easy it is to spin it up.
    Make the value lower and it spins up quickly; like you have experienced.
    It should however, get back to idle pretty quick too......

    I suspect the "0.082" value; this one -lets say for now- is how much the throttle remains open after you let go of the pedal.
    Lets say you want the engine at 1000rpm idle and I start with that line:
    1000 > 0.082
    1250 > 0.075
    1500 > 0.068
    1750 > 0.061

    In this case (exaggerated, because it would run faster than 1000rpm) the rpm will fall back to idle slowly.
    It will run back faster in this case:
    1000 > 0.082
    1250 > 0.008
    1500 > 0.002
    1750 > 0.000

    It's a matter of trial and error to find the proper setting you want of course, but you can play around with these values best.
     
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  5. Raintyre

    Raintyre Registered

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    If revs down much slower than up, it is also possible you have a very high engine brake config, which uses a portion of throttle even when your pedal is released.
     
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  6. toebee

    toebee Member

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    lol I am an idiot. I didn't realize there was an actual EngineInertia field. I get it now. Thanks for the help guys
     

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