Cheers for the replies. I decided to go with an 8.5t motor (25 tooth pinion) partly because I didn't want to be on the limit of the esc's capability and partly because the shop didn't have a 7.5t. Had the car out for 15 mins earlier and the difference is unbelievable, had trouble keeping the front 2 wheels down. Didn't have problems with cogging but like I say only did about 15 mins.
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