More gearing questions
just upgraded my slash 2wd brushed to the turn igy ********* 8.5t from HK;
Can Size: 540
Sensored: Yes (Standard 6 pin harness)
Max voltage: 7.4~11.1V (2~3S)
Max Current: 33A
Max Watts: 365w
No Load Current: 5.8A
Shaft Size: 3.175mm
Can Diameter: 36mm
Can Length: 51.5mm
and this ********* ESC on a 3s lipo
Cont. Current: 100A
Burst Current: 200A
Car Size: 1/10th
Battery: 2-3 Cell Lipo
L-BEC: 5.0V / 2A Output
Motor Type: Sensored or Sensorless Brushless
Size: 40.5 x 37.5 x 24mm
Battery Plug: Required
On/Off Switch: Yes
Thermal Overload Protection: Yes
Battery Terminals: 12AWG size
Motor Terminals: 12AWG size
Problem is that it's running pretyy hot with the stock gearing (19t pinion 90t spur). I went down 1 tooth on de pinion (18t) and it seems to get even hotter (could be me, don't have a temp gun).
I have now ordered a 16t pinion and a 92t spur which will hopefully make things better. But will it? I noticed that in some cases a larger pinion (let's say 20t) made the motor and esc cooler. I guess this would have to do with less rpm's? Then again it will also increase the load on the motor so I think I'm not understanding it fully.
I was running it (as a test) on the street and on some gravel but it should work offroad (there's a small track close to my house). After 10 minutes or so the thermal protection kicks in (which kind of s*cks as it also cuts power to the steering servo, not very nice when this happes while going pretty fast).
Anybody willing to shine a light on this? Am I turning into the wrong direction?
The motor would be a lot cooler if you ran it on 2s lipo. 3s is fast and powerful, but also adds a lot of heat.
Regardless, you need to add an aluminum transmission case to help keep your temps down. At the very least, a heatsink on the motor will help. The motor looks pretty good on paper but I think the 3s is too much for it without gearing down and adding aluminum to cool.
A temp gun is a must to know how hot is too hot. I had the same feeling with a setup I was running, borrowed a good temp gun from an auto tech and learned that 135-165 can feel pretty darn hot. That temp gun will help a lot with gearing and also make you feel comfortable you are not about to harm your suped up motor!
[QUOTE=kwitty;5248342]A temp gun is a must to know how hot is too hot. I had the same feeling with a setup I was running, borrowed a good temp gun from an auto tech and learned that 135-165 can feel pretty darn hot. That temp gun will help a lot with gearing and also make you feel comfortable you are not about to harm your suped up motor![/QUOTE]
This is very true. I thought my motor was running WAY hot until I put a gun on it. 130F feels pretty dang hot to the finger test, but is right in the sweet spot for the motor operating temps.
20 tooth pinion 90 tooth spur. Use a 2 cell with high discharge rate like 35 c , something descent. You'll do good on the track. I use my 3 cell battery only to do speedd runs once in a great while , and to not damage it just being kept stored. I don't use my 3 cell on the track because every time i do , i break something , or strip my wheel hexes'.