MM temps in Traxxas Slash

[Robert]

Airflow is limited but skellyo is running a smaller system with no heat issues. I can't imagine our monuting is that different.

[skellyo]

Originally Posted by Robert

Tomorrow I'll drop in the 13 tooth and see what happens. Perhaps it's the ESC. I don't get the arming tones. I figured that was because the caps were holding the current but it also doesn't appear to enter programming mode normaly. In fact I haven't been able to set it to the remote aside from the first time. When I hold full throttle and turn it on I get a solid red light. Let go and I get a green. I don't know what to think.

To program the MM, turn it on, wait for the first beep, then pull full throttle until you hear the 4 beeps, then full reverse until 4 beeps, then neutral until 4 beeps and then it will beep again to tell you it's done. I never program mine by holding full throttle before I turn it on...always after the first beep, but before the double beep saying it's ready to go.

[skellyo]

Originally Posted by Robert

Airflow is limited but skellyo is running a smaller system with no heat issues. I can't imagine our monuting is that different.

I've got virtually no airflow on mine. It's double side taped right behind the Rx box on the chassis.

[Robert]

Originally Posted by skellyo

To program the MM, turn it on, wait for the first beep, then pull full throttle until you hear the 4 beeps, then full reverse until 4 beeps, then neutral until 4 beeps and then it will beep again to tell you it's done. I never program mine by holding full throttle before I turn it on...always after the first beep, but before the double beep saying it's ready to go.

I must be reading my manual wrong. Thanks for clearing that up.

[sleebus.jones]

Originally Posted by Robert

Yes it did seem quicker with the smaller pinion.

If that's so, it sounds like it was overgeared. I don't think the slash is "big" enough to require a larger motor, but that's just me I guess. I've also found in the past that better batteries (i.e. ones that don't drop voltage as much) will run the system cooler, since you're not trying to suck the life out of the battery and make power with the current. Packs that maintain their voltage level seem to run cooler.

[Robert]

I took it out for a run on the 13. Temps are still not good on the motor. Speed control was 143, batteries at 140 (7 cell gp3300), motor(5700kv) was smoking at 180. This motor simply won't run in the slash well. Maybe try the 4600kv Unless you think 180 is acceptable for a 5 minute bash.

[skellyo]

I'm really surprised the 5700 won't come down in temp. But, I do think the 4600 is better suited for the Slash.

[Robert]

I agree. :) How is your staying cooler? Different driving habits? Yours is smaller if I recal.

[skellyo]

I'm running the 4600...that's why it's cooler than your 5700.

[Robert]

ahhh ha that would explain it

How much top speed can I expect to loose if I swap to the 4600?

[skellyo]

Mine is geared for 33mph on 2S lipo. You should get a little better speed with higher NiMh cell counts. However, IMO, 2S Lipo is the way to go.

[BrianG]

The 4600 running on 3s but geared down to ~30mph should help things a bit. If you want to keep the 5700, I would gear down quite a bit if running on 3s. Just trying to lessen the motor/ESC load a little.

[skellyo]

Originally Posted by BrianG

The 4600 running on 3s but geared down to ~30mph should help things a bit.

Temps on my 4600 in my Slash are fine on 2S geared at 33mph. I'm not sure why you would recommend gearing for less speed than that on 3S?!?

[Robert]

I was really hoping for the 3s. The few times I've had it out on the 9 cells it's been fun. So maybe the 4600 or VXL motor is the answer then. Both are cheap motors atleast. I'd really like about 50 MPH top speed. There's a few revos in the neighborhood I need to keep on top of.


I don't think there's a small enough pinion that would produce an acceptable top speed with this motor in this truck.

I geared it back up today to the 15, stuck a fan on the esc. I didn't check the temps again but will later today and report them back. The truck is real fun. Half my yard is sand, we've built a few sweeping dunes of sort, between that and the weeds it's like the desert.

[Robert]

ESC was cooler because of the fan, motor was at 180 again. If the ESC is cooler, that's good for me. If the motor burns out, I'll replace it. I'll deal with the temps again when I get the lipos in. As it stands now I get beat the snot out of my brushless slash.