Impact of batteries on Temps

[DaveG28]

Random question but looking to see what may be causing some temp problems...what impact do cells C rating etc have?

I am running 4S 6800 70C....would my motor temps reduce a little if I used lower C cells, or would it not make any difference?

[h0m3sy]

What motor are you running Dave?

[ianjoyner]

The C rating won't directly affect temps, but if you are using all the punch they have to offer, then a higher C rating will result in higher temps.

Rather than reduce the C rating it would be better to turn down ESC / motor down / gear down / Tx throttle settings.

[DaveG28]

How would temps be impacted by throttle tx settings?

Eg if I turn down EPA, will it reduce temps or increase them (as the motor is never flat out?)?

Would temps be helped by playing with the expo to effectively reduce punch a bit?

[adon30]

Dave, I would have thought that the esc would be the limiting factor in the amount and rate of current being provided to the motor. Be through the acceleration phase (punch) or when flat out (boost/ turbo). Although the higher rated batteries will be able to cope with more punch and be more likely to provide it.
As well as the above suggestions keep in mind ambient temperature and airflow across the electronics which will all affect cooling/ heating far more.

[DaveG28]

That's why I wonder about the castle fan...a fan is good but is shrouding half your motor in plastic really going to help!!

[ianjoyner]

Reducing the throttle end point or throttle speed, maybe not the curve so much, but basically anything that means less throttle will reduce temps.

If you don't want to reduce the car's speed though, more air flow would make a lot of sense.

[jmke]

That's why I wonder about the castle fan...a fan is good but is shrouding half your motor in plastic really going to help!!

active airflow over the metal outside of the castle motor which is build as a heatsink will lower temps a lot, even with a small fan, that runs very slowly. Any airflow over hot running parts will drops temps A LOT, passive cooling (dissipation) is a very slow process. so that small fan on your motor will drop temps by 10°C+ and more; the shrouding with plastic doesn't impact this ;)

[DaveG28]

Reducing the throttle end point or throttle speed, maybe not the curve so much, but basically anything that means less throttle will reduce temps.

If you don't want to reduce the car's speed though, more air flow would make a lot of sense.

I could definitely survive losing a bit of top end, just wasn't sure if this would make it better or worse on temps! May try it!