I run both NOVAK and LRP B/L ESC's, and have thermalled a couple times when I first started running B/L's.
I generally try to keep my motor temps under 180, (TIGHT, FAST OVAL) everywhere else seems to be closer to 160-165 max (except during extremely Hot days of Summer)
The NOVAK system (Motor and ESC) has a thermal limiter if the Motor gets too hot, but if you use other 'sensored' motors with a NOVAK ESC, I don't believe they have a Motor Temp sensor. Same goes if you use the LRP ESC with a NOVAK motor, I don't believe the motor's temp sensor is activated.
...for Oval now were running the really low Kv motors, for the most part nothing hotter than a NOVAK 10.5 which is rated at 4200-4300Kv, and we're running 17.5's and 21.5's, which are 2,200 and 1,800 Kv rated. (NOTE: Kv = unloaded RPM per volts input.)
Depending on what type of racing you'd be doing, there are some people who have had problems with the Non-Sensored motors sometimes not wanting to launch off the line, or actually go in reverse from a standing start. This doesn't seem to be an issue with sensor based B/L systems. I'm also hearing this is less of a problem with the HOTTER/Higher RPM sensorless systems as well. ie: 3.5, 4.5, etc....
I've personally had great luck with both Novak and LRP systems (GTB and SPHERE COMP) and I've heard some good things about the Traxxas system too, but haven't seen them in action.
The MAMBA systems I've seen run, ran really well and were VERY fast....but ALL of them I've seen had the launch issue under a hard standing start situation.
Originally Posted by duckman996
Don't you mean gear higher... BL motors require a larger pinion for a much larger roll-out then a typical 19T?
Depending on the BL motor you are getting, you will be gearing at least 5 teeth higher then a typical 19t motor.
....and I agree, we gear the B/L's MUCH taller than I've ever geared a Brushed motor... If a 10.5 motor is rated for 4200Kv (or unloaded RPM) on a 6 cell system, you'll probably only see around 23,000 - 24,500 RPM loaded. Maybe LESS.