Madness or a wind up, am thinking 10turn brushed is fast enough for 4 wheel drive, lower turn motors may make the car balistic but you will crash more and thats not what getting round the track is about, look around at other racers, see what they are running-not just your mate- possibly change the pinion/gear ratio, this can give more top speed or grunt. Zx-5's are not strong in the diff department, too much power and you will be stripping gears.
Lipo is a good way to go, 7.4 volts the 2009 offical BRCA list will be out very soon, this lists the approved batteries for BRCA sanctioned racing, you may not need this at club, but there are a lot of racers on oOple waiting for the list before buying for next year.
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