differential of rear traction

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Setting anti-slip = 0.0, anti-slip-torque = 0 should give you a open differential. Anti-slip determines the maximum torque difference between the wheels. Try something like 500-1000 for a locked differential, scale it with engine torque.

Anti-slip-torque scales diff torque with driveshaft torque. You can try anti-slip = 0.0, anti-slip-torque = 1. The maximum diff torque will be equal to driveshaft torque then. You can use anti-slip > 0 to clamp it to a lower value.

It would be cool if we had some test track with low friction surfaces to test the simulation(maybe make the garage track a test track?)