Quote:
Originally Posted by nuz69
No. A 1512 1.5Y will short your runtimes if geared for the same speed, because it won't be efficient at all in a truggy. The motor is too short. The runtimes don't depend of your motor, unless its undersized, but of your voltage, your gearing and the weight of vehicle.
To increase runtime you need to increase efficiency, if you cant change your motor, you need to up you voltage and reduce the gearing, to keep the same power and reduce current.
More over your timing is not right for Y windings. Best efficiency with the 2200kV 1515 1Y motor is 4-5, not 0.
==>Try first to reduce a little your pinion, set the correct timing. Punch at 75% is good, you don't need more power at start.
A Castle 1518 1800kV will be more efficient in a truggy on 4 or 5S, and the 1520 1Y 1600kV on 6S with low gearing would be the best solution ever to have insane runtimes, but I do not know if the rules permit theses motors...
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This isn't necessarily true and could be misinterpreted. A 1512 very well could be more efficient in a truggy with the right conditions and the right driver. A smaller motor will very likely achieve more runtime in ideal conditions as well(as long as it isn't too small) - it simply takes less power to move itself. I am not saying the 1512 is the answer, but i wouldn't flat out say that it isn't, either. Likewise, the 1518 may very well achieve less runtime on the same 4s battery in this application.
5s on the 2200Kv motor is quite aggressive as well - I am not convinced that this is as efficient as 4s in this particular application to be honest. I don't know if you could achieve a low enough gearing for starters, so current draw very well could increase rather than decrease. I doubt it is as drivable, either. Zero timing will be the most efficient with pretty much any of these motors, but you won't likely find more than a few seconds of runtime when switching from zero to 5 degrees anyways. Higher timing will hurt efficiency more at low speed, which is where most of the time is spent in RC racing - timing advance reduced torque and increases rpms. You torque to accelerate a truggy, so zero timing gets my vote.
My suggestion would be to simply gear down a tooth and set the LVC to 3.1 or 3.0 volts/cell to gain the runtime if you are using good batteries. And stick with Zero timing.