[10kman]

Running a Castle 1518 @ 1800 k/v, MMM ESC, and both Turnigy 4s and 5s lipos.

Nothing obvious looks to be wrong, no binding issues anywhere, lipos are balanced, no sticks stuck anywhere, etc.

Tried originally running 18/49 gearing (brushless MGT 8.0 vehicle), on 4s, and in grass, motor would get upwards of 155-160 after a pack (5000mah).

Didn't like the temps, so started doing some math, and the truck was geared for about 33 MPH with that ratio, so I upped it to a 20, and a 22t. Both yielded same results, heat.

Tried a 4s pack again today, using a 22t pinion, in a parking lot. Drove around, checked every 5 minutes or so, and it was doing the same, getting hot. I finished up the pack, and it was again nearing 160.

Read some more, figured the relatively low k/v would like more juice. Tried a 5s lipo with 22t pinion again, but in grass, and it got hot again, almost 160.

Dropped back to an 18t pinion, on 5s, and same deal.

I'm worried because it's not really stopping at a mid-150's temp, it's climbing the longer I go. I'm driving normal, on and off, jumping here and there, rolling it over, going to get it, so it's not a race with constant throttle, no speed running, I rarely even get to full throttle anyway, the truck flips onto the lid in no time.

On 22/49 gearing, my final drive is 12.52413:1.
On 18:49 gearing, my final drive is 15.30726:1.

4s lipo puts the motor at 26640 rpm.
5s lipo puts the motor at 33300 rpm.

Max RPM on the can says 60,000.

ESC is rarely at 130 with either setup, and the batteries seem to end up about 10 degrees above air temp. So no issues there.

Am I just not putting enough voltage into this thing to get it to a better point of efficiency, is something wrong, am I driving too hard in spite of my gearing options? I really don't think it's the driving style, I'm really not doing anything extreme here.

Thanks for some ideas. For comparison, my first e-MGT I used a Neu 1515 1/Y @ 2200 k/v, and was using 18/52 gearing and 15/52 gearing off and on, and didn't ever have an issue. Same temp gun too, 4s lipo.

I have a picture attached of the mounting, I was thinking it's not getting any airflow. Windshield is cut out on the body too. Do I need to fan it?

10k