[ASSETS] [OPEN SOURCE] Tanks, tracks and N-wheeled vehicles

Try re-importing it so that pivot is in the middle of the wheel. Otherwise if I have time today I can correct a code to remove this dependency as it make sense for tracks to have their own adjustable Y position just from coordinates of spline control points. I thought that this is how it actually works alread:D

You need to convert Torque into N.m which is going to be 2101.51782 Newton-Meter. This will be the highest point on the graph. What was the max RPM? Lowest would be somewhere around a 800-1000, just a guess.
By red-lining you mean color of RPM in GUI or absence of torque on tracks? GUI color is derived from a color curve which you need to change to your specific engine, otherwise you are using colors from M113 which is very specific to that engine.
From simulation point of view, red-lining happens when angular velocity of the axle multiplied by current gear ratio and differential is higher than engine max RPM. For this to work properly, sprocket radius, gear ratio and differential have to be somewhere around realistic values. This is not too difficult if you just tune everything one step at a time:

  1. Put all GearRatios, DifferentialRatio and EngineExtraPowerRatio into 1
  2. Draw new torque curve (we will revisit this after we know max and min RPM)
  3. With such settings it should be really hard to get into red-zone as tracks have to spin with whooping velocity of over 1000 rpm (which is surely possible but should happen around top speed of the vehicle).
  4. Disable auto -shifting when you test this (“Z” to switch mode)
    From here you could start playing with higher gear ratio for first gear and differential of about 2-3.