Well, turns out it did need ball racing. I thought I'd test it but 5 mins in and it made a funny noise. A quick strip down showed a brass bush had melted into the gears inside!!
I got it apart and ball raced as much as I can using bearings from another old Tamiya I had. Only the wheels need bearings now. Those brushless motors must generate some heat as I've run continuous packs through the car when it was using a silver can motor for over half an hour and not had problems.
I have another touring car now so this is actually my back up car but I may do a couple of races to see how it compares.
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