Mountain Pass Performance - Model 3 rear subframe stakes

The rear suspension on the Model 3 is mounted with rubber bushings. These rubber bushings are quite firm, but they still allow a slight movement of the entire rear subframe under heavy load when cornering. While this does not cause a shift in the overall angle of the toe, it can cause a change in the angle of pull and allows some lateral movement of the entire subframe. With inserts from Mountain Pass Performance, a more stable and firm construction is achieved which allows for a harder ride on the track.

Below are Mountain Pass Performance's own words:

Description

The Model 3 rear subframe, which all the suspension arms connect to, is mounted to the chassis with rubber bushings. These rubber bushings are quite firm, but it still allow some slight movement of the entire rear subframe under heavy loading. While this does not cause a shift in total toe, it can cause a change in thrust angle amd allows for some lateral movement of the entire subframe during cornering. This causes a disconnection between the driver's understanding of the rear tire grip. Is the tire sliding, or did the entire rear subframe just move under me a little bit? Our Model 3 subframe inserts help improve that connection your brain has to the tire.

We've been meaning to develop subframe inserts since 2018, when Tesla switched the very early production cars from solid subframe bushings to rubber. As you might imagine, Tesla did this to reduce noise in the car. So you should know that there is a slight increase to NVH with this part - mostly just some additional noise coming through from the rear of the car. It's relatively minor, but it's worth pointing out.