Hi Ben
Rather than spending a fortune upgrading your Tamiya, i reckon you`d be best just learning basic skills with it and then buying a good used second hand Associated B44 or such like if you feel you want to compete. It will be much more suited to racing, be competitive out of the box and others wil be able to help you with setup etc too.
Ive never raced at Eden Park so i cant tell you what exactly you will need there. Best pop along to a club meeting and ask some of the other guys.
Tyres can be bought from any of the major online retailers, sponsors of this site or from schumacher themselves direct.
I suspect that most will run them with the medium green inserts from Schumacher. They will need to be superglued onto the rims.
Ceramic balls are much harder than the std steel ones and dont wear out as quickly. They will wear the diff rings more quickly but generally speaking, using them just means a smoother diff for longer thats all. Its just durability.
I cant help electrics wise with what you have got as the numbers dont mean anything to me. Again, they may be more suited to car park bashing than racing. You can pick up a good used speedo on here for £50 now that will run any motor you`re capable of handling. Motor wise, brushless is the way forward, probably start off with a second hand 10.5 if you are new to racing. Most guys use a 6.5 or 5.5 in 4Wd and a 6.5 or 7.5 in 2WD. Lower the number the faster the motor. 5.5 is enough for anyone though.
Hope this helps a little more
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