Hey Benny,
I raced the original TNX for some time, the best thing you can do is get some decent tyres on it. I find the Proline Crimefighter MTR's work best for me.
There is heaps of information here -
www.tamiyatrucks.com
This is my old truck -
www.members.optusnet.com.au/nrgroup
Are you planning on racing at the Winter Cup next weekend?