why are my temps so high???

[mk351e]

a little more info is in order I think:

1st - and this may be odd, but the battery is always dead last to get hot; in fact, it normally doesn't. It's usually, MMM, Neu, then battery gets hot. My MMM fan seems to be on almost all the time, but castle says it's ok. As for the motor selection, here's some interesting info: a VERY trusted source told me that this setup would be ideal, as Neu motors love to spin, and running mine at nearly 50k is a non issue. While they're rated to go to 60k, they can typically function up to about 100k(!). I just wanted to add a little fuel to my pending lipo fire here

Also, I didn't make my point right; i certainly notice a difference in performance between my 2 pinions: the 18T obviously has more top end, but it also seems to pull wheelies easier! What I meant was that there isn't much difference in temps between the 2 pinions.

Does this change anything? And does anyone know where I can get tires that can stand this horribly painful abuse?

[VintageMA]

Originally Posted by mk351e

a VERY trusted source told me that this setup would be ideal, as Neu motors love to spin, and running mine at nearly 50k is a non issue. While they're rated to go to 60k, they can typically function up to about 100k(!).

Is your source a helicopter or plane person?

While it is true that they operate very well at higher rpms - this is probably more true in models where they will spin to that RPM and gnerally just stay there (like a heli where the head speed stays pretty constant once the model is in flight). They will also pull goobs of Amps to get there starting off.

Take a read through some heli threads - these guys use 10-12S setups and can pull 15C constantly for the length of the run. They will heat up and fry motors faster than us - and their flight time is usually under 10 minutes.

A motor configured to spin up to 50k+ rpms will draw as much power as it possibly can to get there as fast as it possibly can - thus heat. If you do this over and over - acclerate/brake/accelerate/brake/accelerate/etc...... - you will definitely heat things up fast. And - IMO even if you gear down to normal speeds to reduce the load on the motor you could potentially be running the motor too unloaded and then again - in-efficient motor and more heat.

Take a look at what BrianG said as that makes a lot of sense (for normal running - speed runs are another story as Finnster and jhautz said). A nitro motor generally max's out around 30-35k rpm, spec your ride for 35-40k rpm (I've been re-configuring everything I have to be in the 38-40k rpm range) and with stock gearing (for that model) you will be 10-20% faster than the nitro version - gear down and you can go faster.

[mk351e]

final piece of the puzzle: the source was CC tech support. Not sure who it was that I spoke to, this conversation took place in may. Come to think of it, I'm not sure why I didn't just come out with that in the first place.

[lincpimp]

Originally Posted by mk351e

a little more info is in order I think:

1st - and this may be odd, but the battery is always dead last to get hot; in fact, it normally doesn't. It's usually, MMM, Neu, then battery gets hot. My MMM fan seems to be on almost all the time, but castle says it's ok. As for the motor selection, here's some interesting info: a VERY trusted source told me that this setup would be ideal, as Neu motors love to spin, and running mine at nearly 50k is a non issue. While they're rated to go to 60k, they can typically function up to about 100k(!). I just wanted to add a little fuel to my pending lipo fire here

Also, I didn't make my point right; i certainly notice a difference in performance between my 2 pinions: the 18T obviously has more top end, but it also seems to pull wheelies easier! What I meant was that there isn't much difference in temps between the 2 pinions.

Does this change anything? And does anyone know where I can get tires that can stand this horribly painful abuse?

Did you read any of my posts? Gear it down some and see what happens...

[RC-Monster Mike]

Originally Posted by mk351e

a little more info is in order I think:

1st - and this may be odd, but the battery is always dead last to get hot; in fact, it normally doesn't. It's usually, MMM, Neu, then battery gets hot. My MMM fan seems to be on almost all the time, but castle says it's ok. As for the motor selection, here's some interesting info: a VERY trusted source told me that this setup would be ideal, as Neu motors love to spin, and running mine at nearly 50k is a non issue. While they're rated to go to 60k, they can typically function up to about 100k(!). I just wanted to add a little fuel to my pending lipo fire here

Also, I didn't make my point right; i certainly notice a difference in performance between my 2 pinions: the 18T obviously has more top end, but it also seems to pull wheelies easier! What I meant was that there isn't much difference in temps between the 2 pinions.

Does this change anything? And does anyone know where I can get tires that can stand this horribly painful abuse?

If your VERY trusted source suggests that this setp would be ideal, then i would suggest that a reconsideration of the level of trust you give this person be adjusted a bit(no offense or disrespect to your source, but your setup is NOT ideal IMO - your temps tell the story, don't they?). The fact is, the 1515/1y motor will operate fine on 6s, but I wouldn't do it myself - your results are about what I would expect. Does it work - sure - but it ISN'T ideal IMO opinion (perhaps I am also a trusted source?). I could get 60mph out of a nitro motor, too - just lean it way out! I wouldn't expect it to last long or run cool, though. The 1515/1y is great on 4s and 5s for sure. On 6s, it is amp-hungry. When you run things on the extreme side, you can expect exactly what you are experiencing. :)

The 18t pinion calculates to around 90mph! - this simply isn't realistic and should not be recommended for anything besides a speed run - and even this is pushing it. To put things into perspective, I run a 1515/2.5d motor on 5s in my race truck(yes, a slower motor with lower voltage). This is on the mild side, but it will still outperform the nitros at the track pretty easily. Perhaps of interest to you is the fact that I can run this setup INDEFINATELY without heat buildup on the race track. As long as I have batteries to feed it, it won't overheat.
I would heed the advice already given here - reduce your input voltage or your gearing to reduce your heat. Just trying to help you get maximum enjoyment from the hobby. It sounds like you are having a blast with the sick setup you have, but you may not notice much of a performance decrease when making the suggested adjustments - but you will almost certainly be allowed to enjoy it for longer periods of time without fear of overheating. :)