Wrong way round - the C4's (and Mamba which are the same) are too big, not the Ezrun too small. Ezrun 5.5t and 8.5t's share the same cans as Speedpassions so are definately the right size. Mamba aren't BRCA legal as they are too large.
Size and kv are not however related. You can make very small high kv motors - they just have less torque. The Ezrun 9t is an example of this. 4300kV is very high for a 9t motor, but because its only 380 sized it has much less torque. This means in heavier cars its not that fast - in my Cat its equivalent to a conventional 10.5t at best.
5700 is indeed either a high Kv 6.5t or a very low kv 5.5t (the Ezrun 5.5t is 6000kv). 7700kv is more 4t than 3t but is still far too much for offroad use.
Its all very confusing!
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Yz4 - Yz2
DEX210 - Cobra 4210- DEX410
RC10 Team - Manta Ray - RC10T
Mini Trophy - Blizzard - Wheely King
Tz4 - GT24B
BMRCC
Emergency back-up race controller
(but only if nobody better is available)
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