TT-01 is a great vehicle, inexpensive and sturdy. I have mine setup with the highest gearing, 55/25 and run a 380c 6s motor on 3s lipo. So far it has done 74mph, and with more room it should beat 80mph. Your choice of the r version was good, I have done all of those mods on mine and it runs great!
A 380c motor? Can't say I know that one. Can you give me any more info on that?
Yeah, I really like my TT-01 too. Seems like a great inexpensive car. I've also done the GPM aluminum steering assembly upgrade with bearings. Here's a picture of mine . . . before I offset the wheels: