AWD has too much understeer?

[reece146]

Cool!

If I am reading this correctly we can do the entire geometry including roll/instant centers and axes and well as the antis.

Very good!

If you want a primer on this stuff, check your local universty's library for "Race Car Vehicle Dynamics" by Milliken and Milliken (SAE Press). It will explain the geometry. It is a great book, I got a copy from motorbooks.com.

Back to the particle stuff...

Is there a way to specify the exact centroid of the car as opposed to fudging with a series of these particles? I happen to have an Impreza out in the garage (blew the engine in it last night - crap!) that I can physically measure this off of. I will be pulling the engine at some point over the winter but that is only one particle. I can measure the real centroid location via the normal scales and jack method but that gives me one location/weight pair. I can add the engine, driver and fuel tank as other particles I guess but that would not be enough to give the polar moment.

Hmm, is there a way to input an actual moment value? With a turntable and a stop watch I might be able to measure it within one or two signifigant digits.