Problem with Vehicle Engine Simulation

Hi,

I'm working on a car project.

I've implemented the Engine like in Stundplayground.

I calculate the rpm:

wheelRotationRate * mpGearRatios[mCurrentGear] *
mDifferentialRatio * (60.0f / (2.0f * Ogre::Math::PI));

and then the wheel torque

torque = throttle * lookupTorqueCurve(mRpm) *mpGearRatios[mCurrentGear] * mDifferentialRatio;

I call this in the cars callback.

But in higher gears the car gets slower instead of faster I looked trought the Stundplayground source code
many times but coun't find any differences to my code.

I hope someone can help me I've found something in this Forum too but it was just the same formula.

I've forgot I'm using NewtonSdk 1.5.3