motor heat, what will create more?
04-17-2012, 08:50 PM
#3
It depends on what the gearing is. If its geared for a 13.5 and you drop a 7.5 in the 7.5 will run hotter. If its geared for the 7.5 and you drop the 13.5 in the 13.5 will run hotter. If you think you will use the motors interchangeably without changing gearing be prepared for a smoke show.
04-17-2012, 08:58 PM
#4
It depends on what the gearing is. If its geared for a 13.5 and you drop a 7.5 in the 7.5 will run hotter. If its geared for the 7.5 and you drop the 13.5 in the 13.5 will run hotter. If you think you will use the motors interchangeably without changing gearing be prepared for a smoke show.
04-17-2012, 09:06 PM
#5
Tech Regular
iTrader: (13)
It depends on what the gearing is. If its geared for a 13.5 and you drop a 7.5 in the 7.5 will run hotter. If its geared for the 7.5 and you drop the 13.5 in the 13.5 will run hotter. If you think you will use the motors interchangeably without changing gearing be prepared for a smoke show.
04-17-2012, 09:27 PM
#6
It depends on what the gearing is. If its geared for a 13.5 and you drop a 7.5 in the 7.5 will run hotter. If its geared for the 7.5 and you drop the 13.5 in the 13.5 will run hotter. If you think you will use the motors interchangeably without changing gearing be prepared for a smoke show.
04-18-2012, 05:32 AM
#9
Tech Rookie
That depends.
Every Motor has a Range of Load (in Amps) where it works optimal.
A low turn (high kv) Motor will waste more Power when it has not much load.
A high turn (low kv) Motor will need less power for simply turning its rotor, but if you put too much amps on it it will eat them without giving appropriate ouput.
So:
If you gear your car slow: The 13.5 will run cooler, if you gear fast you will need the 7.5 because the 13.5 is unable to do that.
Every Motor has a Range of Load (in Amps) where it works optimal.
A low turn (high kv) Motor will waste more Power when it has not much load.
A high turn (low kv) Motor will need less power for simply turning its rotor, but if you put too much amps on it it will eat them without giving appropriate ouput.
So:
If you gear your car slow: The 13.5 will run cooler, if you gear fast you will need the 7.5 because the 13.5 is unable to do that.
04-18-2012, 07:38 AM
#10
The reason for me starting this thread was essentially to do some research on a race we have coming up. It's an enduro race, 200 laps, will take about 2 hours to complete. I'm just trying to figure out which motor would be my best bet for controlling the heat but still have decent speed. I know with my 13.5(class I usually run), I have it geared as high as possible to be at the upper range in temps after the main. And what Prokktor said in regards to each motor having an optimal range, that makes sense. With that said, I think I'll run the 7.5, geared at the lower end of it's "optimal" range and hope for the best. Thanks for the help guys.
BTW, this enduro race in an open class race so I can choose any motor and any timing.
BTW, this enduro race in an open class race so I can choose any motor and any timing.
04-18-2012, 08:08 AM
#11
My track runs an EIGHT hour short course enduro every year on new years, and we all have to run 13.5 zero boost. We gear our 13.5s around 87/20. I also wired up a tiny little fan to blow across the motor which helped a bit, but the motors run cool all day, usually under 110. Geared that low, they aren't that fast however. But in an enduro, it's more about "not breaking" and battery changes then anything else.
04-18-2012, 08:15 AM
#12
In that case it shouldn't matter what motor. Heat will be dependent on gearing, motor timing, boost etc. Gear it properly and you'll be okay. Something like that I'd run in a blinky mode. And spend some time experimenting with gear ratios. Contact the motor manufacturer and see what they say for your situation.
One thing to consider is you will get more battery life from a higher turn motor I believe. Which would equal less pit stops for battery changes etc.
Sounds like a fun race.
One thing to consider is you will get more battery life from a higher turn motor I believe. Which would equal less pit stops for battery changes etc.
Sounds like a fun race.
04-18-2012, 08:33 AM
#13
In that case it shouldn't matter what motor. Heat will be dependent on gearing, motor timing, boost etc. Gear it properly and you'll be okay. Something like that I'd run in a blinky mode. And spend some time experimenting with gear ratios. Contact the motor manufacturer and see what they say for your situation.
One thing to consider is you will get more battery life from a higher turn motor I believe. Which would equal less pit stops for battery changes etc.
Sounds like a fun race.
One thing to consider is you will get more battery life from a higher turn motor I believe. Which would equal less pit stops for battery changes etc.
Sounds like a fun race.
04-18-2012, 03:01 PM
#15
if it was me i would be using the 7.5 in blinky mode then if you find your not using all the power then turn your transmitter down to say 80 or 90% and drive with out excessive spinning wheels etc
ease of the gas and roll into the corners and you will find your lipo changes will last a long time and you will have no excess heat in motor or speedie
example i raced a truggy 30 minute final last year and in the heats i normally use about 2800 to 3200 mah on my 5500mah lipos , well i went into the final think ok drive smooth and turn everything down to 80% still had enough speed to jump all jumps but just not as much top end , in saying that i took my pit stop at the 16 mintute mark and then then completed the race on a 1 stop etc
to my surprise after 16 or 17 minutes running i still only put 3400 to 3500mah back into the lipos , i damn near could have run the whole race , this was driving it very easy and rolling into corners and using the cars weight and speed to keep momentium etc
good luck it sounds like fun a endro and its something i would like to have a go at as well
ease of the gas and roll into the corners and you will find your lipo changes will last a long time and you will have no excess heat in motor or speedie
example i raced a truggy 30 minute final last year and in the heats i normally use about 2800 to 3200 mah on my 5500mah lipos , well i went into the final think ok drive smooth and turn everything down to 80% still had enough speed to jump all jumps but just not as much top end , in saying that i took my pit stop at the 16 mintute mark and then then completed the race on a 1 stop etc
to my surprise after 16 or 17 minutes running i still only put 3400 to 3500mah back into the lipos , i damn near could have run the whole race , this was driving it very easy and rolling into corners and using the cars weight and speed to keep momentium etc
good luck it sounds like fun a endro and its something i would like to have a go at as well
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