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Old 01-24-2009, 10:11 AM   #1
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Default ESC overheating...help plz!

hi, on the back of my reedy challenger 19t motor, it says
"Correct gearing is critical. An incorrect gear ratio my result in excessive motor and ESC temperatures..."
It also came with a little table that said that a 1/10 touring on rubbers need a 6.4:1 FDR i havent a clue what that means

So i raced regardless and now... my ESC is getting too hot and cutting out.

I thought it was because the ESC is to weak for the new motor, because its very good, keeps up with my mate with brushless!

I found out that my ESC has a rated current of 75A...but i don't know the motor.

So, any help i will be thankful for. my ESC is a LRP AI Runner Plus reverse no.83060. Motor is a Reedy CHallenger 19t spec racing motor, my car is a Schummacher mi2

Thanks!
Greg
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Old 01-24-2009, 10:30 AM   #2
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Your ESC should be able to handle the motor, a quick google search threw up a limit of 15 turns.

Gear ratio is very important. What gears do you have on the car now? The car's manual or one of the experts in the Schumacher thread should be able to tell you the internal ratio of your car, it is then a case of doing some maths...

FDR aka Overall ratio = Internal ratio*(spur/pinion)
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Old 01-24-2009, 10:34 AM   #3
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i have a 89 teeth spur gear and a 24 teeth pinion....
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Old 01-24-2009, 10:41 AM   #4
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Quote:
Originally Posted by PocketRocket View Post
i have a 89 teeth spur gear and a 24 teeth pinion....

Heres the link to understand FDR http://www.robinsonracing.com/tips.html
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Old 01-24-2009, 10:56 AM   #5
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Quote:
Originally Posted by PocketRocket View Post
i have a 89 teeth spur gear and a 24 teeth pinion....
I can't imagine that this gear ratio will be overgearing the motor so the case of the overheating must be elsewhere.

Check that the car rolls freely and that the motor runs "normally" if it is out of the car. Check that there is air flowing over the ESC (no waterproof covers or anything like that.

Apart from that it is going to be very hard to work out what the problem is over the internet.
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Old 01-24-2009, 11:03 AM   #6
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i still think its a too powerful motor for my esc, my mate has a better one on sale and hes letting me try before i buy, i'll update this thread after i do it
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Old 01-24-2009, 11:44 AM   #7
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how hot does it get? does it actually cut out? or does it just feel hot? hot is fine, but cutting out is pretty bad.
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Old 01-24-2009, 01:04 PM   #8
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it just goes normal then it just slows down and stopped instanly...
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Old 01-24-2009, 01:19 PM   #9
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hey PocketRocket

what pully are you using, 20 or 17?

If you are using a 17t pully then your gear ratio will be 7.86 using a 89/24 spur pinion combo.


If you are using a 20t pully then your gear ratio will be 6.68 using a 89/24 spur pinion combo.


If you want i can email you a program that you can use to calculate your gear ratio, just drop me a pm

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Old 01-25-2009, 11:30 AM   #10
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Quote:
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hey PocketRocket

what pully are you using, 20 or 17?

If you are using a 17t pully then your gear ratio will be 7.86 using a 89/24 spur pinion combo.


If you are using a 20t pully then your gear ratio will be 6.68 using a 89/24 spur pinion combo.


If you want i can email you a program that you can use to calculate your gear ratio, just drop me a pm

Steve

whats a pully, sorry i'm really new to the hobby
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Old 01-25-2009, 02:43 PM   #11
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The pullys are the other gears on your car the front and rear.
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Old 01-25-2009, 03:20 PM   #12
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The pullys are the other gears on your car the front and rear.
i was refering to the centre pully
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Old 01-26-2009, 01:56 PM   #13
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Quote:
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i was refering to the centre pully
ahhh, yh i know what u mean now, its 20t...sooo
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