ventilator:
At first: Great what you have done with the Physics Engine until now in this short time...

About your problem:

quote:

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manual v6.00 -> PH_Wheel -> Parameter 4
... Use (-360, 360, 0) to remove all limits.

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This you do! And perhaps this is the reason for your snapped wheel... because if you don't allow it to change its angle in this direction, the problem shouldn't appears !??
Because I haven't understand the usage with the angles yet (I wait for the german translation ), I don't know what the right valuas are (/should be).

Greets,
Clemens

P.S. Upload your car-demo when it is done [only a suggestion ]... And all free source code is also appreciated!

EDIT:
Two other things about your Code:
1.)
<EDIT> DELETED! reason: stupid question/idea...
2.)
Do you use a motor, yet?
If "yes":
Where is the updated code ?
If "no":
How do you give the car a force? By giving only the p_player a CENTRALFROCE ?