Hi, if it helps, I can say that our club uses Sorex 28R for carpet racing (XG-28JB - Sorex Glued 28R+JB+Revlite24)

Finally finished assembly of the TT-02D (which incidentally will not be used for drifting, but was purchased as it included bearings, super mini shocks and a sport tuned motor) and gave it a shake down yesterday at the race track. It felt promising after racing my usual car all day, and with some experimenting with settings I’m sure it will perform well.

I just used the anti-wear (AW) grease in the front diff and Tamiya grease in the rear (not sure if this is okay or if ceramic grease would be better in the rear – has anyone any thoughts on this?) to give a stiffer front diff action and hopefully more on-power traction. Also used hex drive screws rather than the supplied self-tapping screws to ease assembly and future maintenance. Other items used were low friction step screws (54409 and 54550), low friction suspension balls (54559), low friction suspension shafts (54395), aluminium motor mount (54558), high speed gear set (54500), long wheel axles (53410) to give an approx. track width of 185mm using 24mm wheels / Ride Re32 tyres (note, use gearbox joints 54477 with these universal shafts) and 2.5 degree aluminium rear uprights (54549), which were purchased with a 15% discount from Tony’s Tamiya Parts. Note that the instructions that come with these show upright A on the right of the car whereas it needs to turned upside down and fitted on the left to give toe-in and the appropriate ride height of approx. 5.5mm / 6.0mm for touring car racing.

Does anyone know what the difference is between the on-road tuned spring set (53440) and the on-road spring set hard (53163)? For example, are they the same length and will they suit the size of super mini shocks when used for touring car racing?