Crt.5 brushless overheating

[Jason]

IM BACK FROM PLAYING FOR AROUND 10 TO 15MIN WITH MY CRT.5 AND THE TEMPS WAS :

177F ESC

157F MOTOR

100F BATTERY


IN A OUTSIDE TEMPERATURE OF 18 ºC = 64.4 ºF

I DRILLED HOLE IN THE WINDSHIELD..

I PUT THERMAL GREASE BETWEEN THE MOTOR MOUNT AND THE MOTOR ...

THE CENTER DIFF WAS FILLED WITH 120K FLUID..

NOTHING HELP !



SPECS WAS :

MAMBA MAX 1/10 ESC ( BEC ACTIVATED )

NEU 1509 2.5D 2700KV

13T PINION

46T SPUR

3S LIPO TRUERC 15C 6400MAH ( I TRIED A ZIPPY 3S 5000MAH 25C TOO )

SURE IM USING BIG TIRES AND BIG BATTERY ON MY CRT IT WEIGHT AROUND 6LBS..

Differential Ratio: 3.25
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 13
Total Voltage: 11.1
Motor KV: 2700
Tire Diameter (inches): 4.72
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.0082
Spur/Pinion Ratio: 3.54 : 1
Total Ratio: 11.5 : 1
Tire Circumference (inches): 14.83 inches (376.64 mm)
Total Motor Speed: 29970 RPM
Vehicle Speed: 36.59 mph (58.78 km/h)
Effective KV Value: 2700
KT constant: 0.5 oz-in/A
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified...
Final Power: Amperage not specified...

[Metallover]

Any binding or loose solder joints? It looks like you're geared about right... What kind of driving was it? Hard offroad?

[Arct1k]

3S Lipo MM = BEC and extra cap... temps will drop v quickly

[E-Revonut]

battery temp looks good, motor temp is a bit higher than expected but still safe, esc temps I'm sure are mostly due to running 3s without an external BEC, as already mentioned

[Metallover]

Your truck is really heavy too. What do you have on there that makes it so heavy? Just the tires?

[Snipin_Willy]

Try an external BEC, I think it'll help you out a lot.
I just tried the speed calc with my current CRT.5 setup with some 4s Lipos. 45mph! I might need a gear down some if the MM starts to cook.

[Jason]

I will try to power my receiver with a 6v aa pack then but why I run my traxxas slash on 3s with the integrated bec without any heating issue ? and got issue with this one..

[BrianG]

Depends on the current draw from the servo. The Slash may have less weight in front, so it takes less power to turn the wheels.

[Snipin_Willy]

And depending on your slash, you might not have as much amp draw on the motor either.

[Jason]

do ya think this extra cap would help alot ? :

http://www.rc-monster.com/proddetail.php?prod=35vcap

and do I need to solder it on the esc board or solder it on the esc battery wire can do the same thing ? and more easy to solder ..

[Jason]

[BrianG]

An extra cap will do little to help overheating on the BEC.

[Jason]

only one extra cap not 2 ?

and if the motor heating up does the esc heating up too ? and vice versa if the esc heating up the motor heating up also ?

[BrianG]

I looked back at your original post and noticed you have 4.72" for the tire diameter. Are you sure that is right, it looks awfully large for a CRT.5. 1/8 scale buggies are around 4.25" IIRC.

[Jason]

why not ?