2200kv MMM

[RC-Monster Mike]

Chad,
A higher discharge capable battery would only yield more runtime if the current pack is being pushed excessively. Mah is Mah, after all. What you said "can be" true, but isn't necessarily true.

Nuz,
I am not suggesting a 1512 in this case, and in fact use a 1515 sized motor in my truggy and have also used the same size in a buggy. For truggies, the larger motor is "usually" the better option, but my point was that motor size alone doesn't determine efficiency. A proper 1512 motor in some conditions is sufficient and even ideal. There are simply many factors that can add up - including the actual driving/track conditions and the driver. For example, I have a buddy here with a D8 buggy and D8 truggy - he had truggy motors in both and runs 5s on both vehicles. He often overheated his buggy but not his truggy. Going from a 1700Kv truggy motor to a 1900Kv buggy motor yielded cooler temps in the buggy(geared for the same speed) - the smaller motor was more ideally suited to this particular application in terms of acceleration, deceleration/braking, load and driver style. The smaller motor simply works better. It isn't "necessarily" about motor size and size doesn't determine efficiency.
As far as US tracks vs European tracks - I can't comment on this aside from speculation, as I have never been to Europe. I will say that my local track has a 220 foot straight and even geared for 36mph in my truggy, the nitros aren't any faster. I actually can make faster, more consistent laps when geared for 35-37mph than I can when geared for low 40mph range. The 1/10 second on the straight that the extra speed may yield is lost in the turns and technical sections where I need the resolution more than raw power or speed. I also get lower temps and longer runtime when I gear down and gear even lower on long mains if needed. Just because RCCA or RCDriver clocked a nitro truggy at 39mph doesn't mean they actually go this fast on a track in a race - maybe on a large oval track, but in an off road dirt track, average speeds are typically less than 15-20mph and peak speed is seldom as high as 40mph.

[scooterboy]

I've not checked temps but you can touch / hold the motor no prob after a 15 minute final, I'll see if i can borrow a temp gun next time. according to the advanced calculator a 14t pinion with the 2200kv motor should give me a max speed of 35mph and require 6000mah for 15 mins. Tbh I cannot use WOT (the track i race at is fairly small with a good lap being around 20 to 30 seconds depending on the layout they are using, the straight is short and very bumpy (http://www.plymouthrc.co.uk/))