Adjusting car settings in .xml file

Admittedly, I'm an amateur, but apart from converting cars to expand my
private torcs fleet, I'd also like them to be drivable. Unfortunately,
some of them have insane settings and are like untamed animals beyond my
grasp. They spin at the slightest acceleration or deceleration and at
this point are pretty much useless. 

Could anybody out there lend a hand in making appropriate changes to the
xml file, so those wild ones in my garage could also be brought to the
track? Despite my experimentation, I haven't been able to figure out
which settings need to be altered and how much to make the car more
suitable for driving. I guess I missed that mechanics class.

Some might suggest copying the settings from an existing, functional
car, but then the converted car would lose whatever individual flavor it
had. And of course, I still wouldn't understand why the original car
acted so erratically.

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