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Tekin 2050 overheating on 4S

Tekin 2050 overheating on 4S

Old 10-06-2010, 05:04 PM
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Originally Posted by Ostach24
Everyone has been saying certain gears to get a final end gear ratio, well whats the equation to figure out the right pinion with spur, and what is the accepted or targeted end ratio. Just want to be able to do it myself, rather than jumping on here.
That's a very good question that I would like to know the answer to myself.

Originally Posted by rcgod
Dan, don't forget what I told you when I sold you the motor. Running a 19 or 20 tooth pinion on my ve8 it always ran hot. Going to a 22 lowered temps 25 degrees. Undergearing can make a motor run hot.
Thanks for the reassurance, Kevin. I've been hesitant with going up in gearing only because I've never done it before. Never gone beyond 19T in any 1/8th-scale that I've ever run. Like I said, I have a 20T and a 21T on order, they should arrive by Monday. I'll report back then.
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Old 10-06-2010, 09:50 PM
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What I look for on a 1900 is around 9.5 to 10.0 depending on track ,etc.
2050 around 9.8 to 10.7 or so,etc. 1700s around 8.7 to 9.3...

FDR is calculated Spur/pinion x diff ratio

Of course these are starting figures and for 4s.

I've always looked at it this way, the cars we're using were designed around a nitro .21 engine that spins between 30k and 40k. Make sure your electric motor is around that rpm range and you should be good. This is for CHOOSING a motor/battery combo, NOT gearing.

So 4.2(per cell) x # of cells x KV of the motor
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Old 10-06-2010, 10:03 PM
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What batteries are you using that hold 4.2 volt per cell under load?
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Old 10-06-2010, 10:14 PM
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Originally Posted by Randy_Pike
What I look for on a 1900 is around 9.5 to 10.0 depending on track ,etc.
2050 around 9.8 to 10.7 or so,etc. 1700s around 8.7 to 9.3...

FDR is calculated Spur/pinion x diff ratio

Of course these are starting figures and for 4s.

I've always looked at it this way, the cars we're using were designed around a nitro .21 engine that spins between 30k and 40k. Make sure your electric motor is around that rpm range and you should be good. This is for CHOOSING a motor/battery combo, NOT gearing.

So 4.2(per cell) x # of cells x KV of the motor
Thanks again, Randy. I'm glad you listed what you use for a 1900, because I just ordered one of Castle's 1512 1800kV motors from their clearance. Think 21T will be enough? I'm about to place an order with A Main, and I have a race coming up next weekend (RC Pro Series Texas division finals at N-Control). I've always wanted to try that little 80A 1800.

EDIT- Just did some math according to your formula, and answered my own question.

Last edited by tq_danpatterson; 10-06-2010 at 10:39 PM.
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Old 10-07-2010, 05:42 AM
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I just went through the same mess with my castle 2200 trying to figure out my gearing. I ended up having to go bigger on the pinion too to keep temps down.

I am also excited to try out my new 1512 1800kv.

I ended up getting an eagletree data logger. It's the only way to find the real optimal gearing for your track.
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Old 10-07-2010, 08:21 AM
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I don't choose to use a "loaded voltage" in my equation. Not using loaded makes my equation "on the safe side" .
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Old 10-07-2010, 10:12 AM
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Last edited by itbvolks; 10-07-2010 at 10:42 AM.
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Old 10-07-2010, 10:29 AM
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Originally Posted by S1CK-M1ND3D
Hey Randy,

What gearing and esc setup should I run in a ve8 and a D8te with a rx8 t8 2050 on turnigy 4s 4500? I run at Revelation,Thunder Alley,and OCRC all help would be thankful.
Any suggestions???
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Old 10-07-2010, 10:35 AM
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Originally Posted by itbvolks
Randy,

So based on your FDR recommendations, would running a ~9.5 be a little high with a 1700 on 5S?

Geared 16/46 on my 6T running 1700kv on 5S. Should I look for a 17 tooth pinion (8.9 FDR)???
It would seem as though this thread is getting off-topic, going from "Why my Tekin 2050 is overheating on 4S" to "Randy, please advise me on how to gear my car, which is not running a Tekin 2050 on 4S."

To anyone who was thinking of asking an off-topic question in this thread, please either make a thread of your own, or PM the appropriate person for an answer.

Once my pinions arrive, I will update this thread with new temperature readings and performance reports.
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Old 10-07-2010, 10:47 AM
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I deleted my post.


You've reduced the motor rpm by 3700rpm at the same voltage (14.8v). You need to go up ~2'ish teeth minimum.
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Old 10-07-2010, 11:01 AM
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Originally Posted by itbvolks
I deleted my post.


You've reduced the motor rpm by 3700rpm at the same voltage (14.8v). You need to go up ~2'ish teeth minimum.
Thanks for understanding.

C'mooooon, USPS...
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Old 10-07-2010, 11:04 AM
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Hey Dan - I may just go up one more tooth (if Mikes has it in stock) to a 21T this weekend... Will let you know what happens!
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Old 10-07-2010, 11:07 AM
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Originally Posted by BillySnarf
Hey Dan - I may just go up one more tooth (if Mikes has it in stock) to a 21T this weekend... Will let you know what happens!
Cool, PM me when you do.
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Old 10-07-2010, 04:53 PM
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Update: 20T pinion, 17 min run,4s , 2050 was 158*.

Note, 1st run with castle BEC.. Bumped my 7955 up to 6v now.. Everything seemed better, faster.
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Old 10-07-2010, 06:28 PM
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Originally Posted by BillySnarf
Update: 20T pinion, 17 min run,4s , 2050 was 158*.

Note, 1st run with castle BEC.. Bumped my 7955 up to 6v now.. Everything seemed better, faster.
Hmm. Might wanna be a bit careful there. Tekin CS told me that 180 is the maximum temp for the T8 motors, and 160 means you're either over-geared or over-timed. But hey, adding a fan will bring it down. And maybe still an even larger pinion.
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