Hi Lana
I had a TC3 and was never able to get it setup for either Asphalt or carpet. Once I bought the XXX-S, it was easy. The car ran smooth and setups were easy to adjust to track conditions. The JrXs has really tight tolerances. Adjusments are numerous. I have only run the car for 2 weeks worth of carpet runs and I like it. Its just a matter of finding that setup that works for me