ESC is hot

Post any modifications that you have to get your drivetrain and gearing setup get the most angle out of your chassis.
Luke CS-EVO
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ESC is hot

Postby Luke CS-EVO » Thu Nov 03, 2011 6:38 pm

Hey lads,

Running a Ota R31 chassis with 1.97 CS and my ESC is getting hot but my motor is still very cool.

Motor and ESC is a Yokomo BL-SP2 9.5T brushless with sensor
Spur is a 86T with a 25T pinion.

The standard pinion was a 27T and I believe that made my FDR with my CS setting over 8. With the 25T pinion my FDR would have dropped to about 6.7 which I think is more where the motor and ESC should be? Am I correct in thinking this or do i need to bring my FDR down even more?

Any help would be great, I have a 24T pinion as well which I might try and see if my ECS becomes any cooler.
With a fan on my ECS the ECS stays quite cool but I don't want to rely on that because it still means Its not setup right.



*** UPDATE *** With a 27T pinion and 86 spur my FDR was 6.25 now i have actually moved it up to 6.7. On both of these FDR's the ESC is hot to touch.

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Re: ESC is hot

Postby xReTaLiaToR » Thu Nov 03, 2011 10:38 pm

ESC get hot very easily and quickly. There is a reason why some ESC comes with fan on it. I saw some people ESC got burnt badly and the motor is still fine.
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Re: ESC is hot

Postby Luke CS-EVO » Thu Nov 03, 2011 10:47 pm

Mine came with no fan on it and most people say the ESC and Motor should both be warm. If your ESC is hot its usually because something is not setup right. Sure it can run hot and it will work fine, but its not the best condition for it to run at.

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Re: ESC is hot

Postby xReTaLiaToR » Fri Nov 04, 2011 1:24 am

Oh ok. Maybe you're stressing your esc? What is your esc setting? How long you played till your esc gets too hot to touch?
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Re: ESC is hot

Postby tokeyo83 » Fri Nov 04, 2011 5:33 am

Luke CS-EVO wrote:Mine came with no fan on it and most people say the ESC and Motor should both be warm. If your ESC is hot its usually because something is not setup right. Sure it can run hot and it will work fine, but its not the best condition for it to run at.


Run a fan on it, it makes a huge difference. Usually an FDR from 7-8 is good.
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Re: ESC is hot

Postby Carr » Fri Nov 04, 2011 6:51 am

I run the same ESC with the 8.5t Zero motor in my DRB. I actually took my fan off as I needed it on my Novak ESC in my other car. The motor and ESC do get a bit warm, but I am still able to touch them comfortably with the motor slightly hotter. From memory I believe I am running a 22t pinion and 77t Spur with 2.0CS, can't say I ever worked out the FDR as I just changed pinion until it was at good temps. I have tuned the ESC to get more control on the carpet surface so everything is turned down low.
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Re: ESC is hot

Postby apique_14 » Fri Nov 04, 2011 7:46 am

tokeyo83 wrote:
Luke CS-EVO wrote:Mine came with no fan on it and most people say the ESC and Motor should both be warm. If your ESC is hot its usually because something is not setup right. Sure it can run hot and it will work fine, but its not the best condition for it to run at.


Run a fan on it, it makes a huge difference. Usually an FDR from 7-8 is good.


May i know what do you mean by FDR?whether it for front or rear FDR or CS FDR.I still puzzle with this, whether to check the front,rear or CS FDR.
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Re: ESC is hot

Postby tamiya » Fri Nov 04, 2011 9:32 am

generally speaking, if your BL ESC is hotter than the motor - your car is undergeared, should gear up

if overgeared the motor is hot and ESC is cool


if you're doing crazy high CS% the FDR 5-6:1 (to the rear axle) is low enough, don't need 8:1

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Re: ESC is hot

Postby JeepinDoug » Sat Nov 05, 2011 5:49 pm

FDR is Final Drive Ratio.
Spur divided by pinion equals center ratio, ....example 2.55:1
Rear axle diff gear divided by bevel/driven gear is rear ratio,...ex., 3:1
Add these together for a FDR of 5.55:1
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Re: ESC is hot

Postby tokeyo83 » Sat Nov 05, 2011 9:09 pm

JeepinDoug wrote:FDR is Final Drive Ratio.
Spur divided by pinion equals center ratio, ....example 2.55:1
Rear axle diff gear divided by bevel/driven gear is rear ratio,...ex., 3:1
Add these together for a FDR of 5.55:1


to get an FDd it's (Spur/Pinion) x (chassis internal ratio)

to get a CS FDR it's (Spur/Pinion) x (CS Ratio)

CS ratio is Front internal / Rear internal
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Re: ESC is hot

Postby Luke CS-EVO » Sat Nov 05, 2011 10:29 pm

Last night my motor got really hot so im unsure now, i emailed yokomo to find out what the safe FDR for the system im using is.
Once they tell me the safe FDR for my system i will adjust to suit.


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