About tweak

Sometimes you may notice that your car is understeering when you turn in one direction and oversteering when you turn in the other. What's going on?

The first thing to check of course is your alignment and then your shocks to ensure that the spring collars are still at equal heights, and check your weight distribution to ensure the right-side weight is pretty close to the left, and finally check for damage anywhere that might cause this behavior.

If all of those check out and the behavior persists, you may be dealing with chassis tweak. This will typically happen when the chassis or upper deck are "tweaked" during a crash - they can get jammed to the side, and the chassis and top deck screws then hold them in that tweaked position, creating uneven handling.

To fix tweak, you can loosen the screws holding your upper deck and chassis to the bulkheads all at once, let them straighten out, and then tighten the screws again.

Various tools are available online to help you check for tweak and ensure that your chassis has been set up perfectly straight.

Here is a good video that illustrates the concept: