Wheel with high torque causes slipping with highest friction coefficients

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I am trying to model a car in Gazebo. The mass is about 2000kg and the wheels have a diameter of .356 meters.

Based on the max acceleration of the real car 3 m/s^2 it would require a force of 6000 newtons or a total torque on the wheels of 2136 N*M. Split among its two front tires that is a max of 1068 each.

I modeled the car (ford escape) in Gazebo using realistic dimensions and weight, when I apply 760 N*M of torque each (Using AddTorque on a Link with a plugin) it works up until about 3.5 m/s then the wheels begin slipping.

My model is using:

       <collision name='front_right_wheel_link_geom'>
            <pose>0 0 0 0 0 0</pose>
            <geometry>
                <cylinder>
                    <length>0.229</length>
                    <radius>0.356</radius>
                </cylinder>
            </geometry>
             <surface>
                <bounce>
                    <restitution_coefficient>.2</restitution_coefficient>
                </bounce>
                <friction>
                  <ode>
                      <mu>1</mu>
                      <mu2>1</mu2>
                      <fdir1>1 0 0</fdir1>
                      <slip1> 0</slip1>
                      <slip2>0</slip2>
                  </ode>
                </friction>
                <contact>
                  <ode/>
                </contact>
            </surface>
        </collision>

As well as placing it on a plane with max friction and no slip.

Is there any other parameters I can try to get this working?

(Using Gazebo 1.5 that ships with groovy)