This little trick might help you out in some Special Event, depending on track & task (as well as on the cost of upgrades :^)
So you get slowed down over grass anyway, but TC may keep you steady. See:
TC on, assists off, sensitivity 7 with minimum steering, fully upgraded
.
As above, except by TC off. Minimum steering as well.
(and some 2 mph faster during liftoff :^)
Hope if helps someday.
PS. At a first look, there are very few threads on Traction Ctrl compared to those on Assists:
http://myrealracing.club/posts/topics?topic=Traction
http://myrealracing.club/posts/topics?topic=Assist