My brushless HPI Nitro MT Project

[MetalMan]

Those temps can definitely be attributed to gearing. Using a smaller pinion would do the trick, but it's understandable that you'd rather save $12 if you can help it.

[GeeReg]

I'm going to try 52/13 with the dirt hawgs tomorrow and see how bad it is. Then if that doesn't work, 52/13 with the road rages. The motor got to 168 last time with 52/15 and the road rages, which are much smaller than the dirt hawgs, which is why I wonder. That was mostly full throttle on pavement though so we'll see.

[GeeReg]

So I tried 52/13 with the Road Rages:

~90 ambient

After 6 min of running:

ESC: 140
Motor: 145
Batteries: 130


After 11 min of running:

ESC: 165
Motor: 167
Batteries: 137


It can't possibly need to be geared any lower can it? The ESC is doing better but the motor is still struggling. I don't know what the next step is except some good fans. Maybe it's just too hot out? :confused:

[coolhandcountry]

Well All three temps are hi. I dont know about final drive on the truck. The temps are higher than I would like to run them. If going down helped. Maybe try a little lower to see. What you have is good for a speed run or something.

[GeeReg]

Final drive is 2.92, if that helps. They are a lot higher than I would like to run also. I can't even get a full pack in because I'm afraid of killing the motor.

[cart213]

Well, I spoke too soon about my system not overheating. Yesterday, I pushed my system over its limits by driving at high speed in grass during 100F weather. The controller thermalled after about 5 minutes. I don't have a temp. gun, but the controller was too hot to touch continuously, and the motor was almost as hot, but I could keep my finger on it. The emoli cells were barely warm, though. I do love those cells! :) In case you forgot, I'm geared 52/15 with M2K's.

[SpEEdyBL]

The motor temps are fine IMO as long as you don't exceed 170. Same goes for the esc.

[GeeReg]

Thanks for the info Cart.

Speedy, I'm just afraid of 170 because that's where my Novak 5800 died (178 it hit I believe). I know technically the ESC is fine unless it's thermalling, I just don't like it that hot. Like I said, maybe I'll try other gearing but most likely I'll get the fans just to keep it in check when it's this hot out.

I don't know if the fact that there is no slipper/diff in the middle has anything to do with it? Maybe it's putting a lot of strain on the motor when the power has no place to go?

[cart213]

I'm technically not running a slipper either, because I've got it locked down tight. If I loosen it just a little bit, the torque of the motor will loosen it up completely within a few minutes.

[GeeReg]

Hmm, I was hoping it would take some strain off the drive train when accelerating and braking.

[GeeReg]

Now you have me thinking. Do I want to even bother ordering the slipper assembly? Or no since I'd most likely have to lock it anyway?

[cart213]

You may not have to lock it. My 540c-9L motor has a lot more torque than your 380c-6L, so you might not have my problem. There's no way to know for sure unless you try it.

[GeeReg]

Yeah I will probably just order it since I chewed up this spur pretty badly somehow.