For more information about NASA Time Trials racing go here
www.NASA-TT.com
The Time Trials Series is broken up into different classes depending on your mods, whp, and power to weight.
The TTR Class is the full unlimited class where anything is allowed and there are no restrictions on the cars.
Here is more info about the championships at Mid Ohio
http://www.nasachampionships.com/
The toughest competition in NASA's season this year will take place September 13-16, 2007 at Mid-Ohio. The 2nd NASA Championships will allow competitors from all over the country to battle for the most coveted National Champion title in their respective classes at one of the most demanding and prestigious road courses in the country. For drivers, this will be a unique opportunity to measure their skills against the best of the best.