[Sammus]

So how come you say the 9XL is a closer match kv-wise? I figure if the trx3.3 is really revving out to 40k like it supposedly does - actually call it about 38k, because by the calcs in your link if it did get to 40k the revo top speed would be above the traxxas claimed 45mph, which is probably unrealistic anyway. So say about 38k, then that means at the stock 15/38 gearing, the tranny input is at about 15k.

Now as an aside, I noticed in the rcm store, the 9xl (or 10xl) kv is 1667 (or 1502) respectively, but on your calcs page, it's 1853 (or 1668) I'm not sure why the difference, I'm guessing the rcm are the loaded values? so assuming that - to get the same speed as the stock nitro setup, at 5s A123 = 16.5v nominal, the motor would be spinning at 27.5k (or 24.7k). So I guess the closest possible match would be to run the 9xl with 23/38 gearing, but would it be bad to say get the 10xl at run 22/40 to get a near similar result?

This is really for interest sake I guess, I was tossing up between the two motors anyway... depends what (if anything) is left in stock by the time I order :P