Ive found the easiest way is to just paste the enginespecs section into an existing engines specs for that vehicle. Eg copying the torquecurve and the other values below it into an existing engine jbeam.
Hey, bison I'm having problems with my sounds for my cars I don't know whether its other mods conflicting with each other and or some file glitches on my end if you know how to fix this please let me know. Thanks