For motors you need to see what the clubs you'll be racing at actually use, as it varies from club to club. For bigger outdoor tracks it'll probably be 13.5; that's definitely the most popular wind overally. But for smaller indoor tracks it could well be 17.5, maybe blinky, maybe boosted. Definitely check before you buy.
I always wanted a TC3 but never had one due to being sponsored on other cars at the time, so I can see the appeal of the TC4. Only downside really is no help on spares or setup from the other club drivers as its a million miles away from the belt-drive mega-flexy TCs that are popular today.
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