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Old 09-18-2009, 09:50 PM
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Default slash gearing

I kust bought a sidewinder 5700 and was wondering what pinion and spur i should use. The stock gearing after 1min of run time overheats the motor and esc[ i temped the esc at 170 and the motor at 210]
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Old 09-18-2009, 09:54 PM
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Hopefully you are only running it on 2S lipo? If it's overheating after 1 min I would gear it as far down as possible. 15/90 is as low as you can go I believe and although it won't give you the top end you may be looking for it will keep things as cool as possible. Also try running a heat sink and a fan on the ESC. Ensure your gear mesh is not too tight because that will fry things quick. And don't run the Sidewinder ESC on 3S with the 5700 motor.
In my SLash I run a Sidewinder ESC with a Velineon (3500kv) motor on 2S and turn my end point on my radio down to 85% throttle. After a single 6 minute qual race I am running around 135-150 and am running 18/86 gearing.
Hope that helps.
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Old 09-18-2009, 10:02 PM
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this helps alot, thank you. i purchased a 90 tooth spur and a 16 tooth pinion today but my hobby shop guy said you can gear it to low and overheatis this correct
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Old 09-18-2009, 10:03 PM
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oh, im running a enerland 5000mah 30c 2s lipo
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Old 09-18-2009, 10:25 PM
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Glad it helped.
That should be a good combo to run and should give you a lot more run time. I personally think the only Castle motor suitable for 1/10 trucks is the 4600kv because of heat issues but also because it's able to run on 3S lipo with the Sidewinder and is insanely fast.

Are you running a 2.4Ghz radio by chance? You can also adjust the end points to keep your motor from being overworked.

The guy that told you about gearing it too low can overheat should find a new profession.
A smaller pinion turning a bigger spur gear means the motor has a lot less force being required to turn the spur. Think of it like a bicycle. The pinion is the little sprocket your feet are turning and the spur is the sprocket in the rear that your back tire uses.
When the chain of your bike is on the very smallest sprocket on the rear it's incredibly difficult to peddle but once you are able to the top speed is great. Quite the opposite when it's on the largest sprocket. Easy to peddle and lots of torque for climbing hills but zero top end. Which would be easier to do on a flat surface? That's how your motor "sees" gearing also.
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Old 09-18-2009, 10:43 PM
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Originally Posted by Neu_Racer
Glad it helped.
That should be a good combo to run and should give you a lot more run time. I personally think the only Castle motor suitable for 1/10 trucks is the 4600kv because of heat issues but also because it's able to run on 3S lipo with the Sidewinder and is insanely fast.

Are you running a 2.4Ghz radio by chance? You can also adjust the end points to keep your motor from being overworked.

The guy that told you about gearing it too low can overheat should find a new profession.
A smaller pinion turning a bigger spur gear means the motor has a lot less force being required to turn the spur. Think of it like a bicycle. The pinion is the little sprocket your feet are turning and the spur is the sprocket in the rear that your back tire uses.
When the chain of your bike is on the very smallest sprocket on the rear it's incredibly difficult to peddle but once you are able to the top speed is great. Quite the opposite when it's on the largest sprocket. Easy to peddle and lots of torque for climbing hills but zero top end. Which would be easier to do on a flat surface? That's how your motor "sees" gearing also.
thank you for the help, i am running a dx3s but turning the endpoints down makes it sloweri wana go fast[ as ricky bobby would say]
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Old 09-18-2009, 10:49 PM
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Yes it does go slower, but still faster than a burnt up motor not going at all. Only other options seem to be low gearing, fans, and heatsinks. Good luck!
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Old 09-18-2009, 10:55 PM
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I just put the 5700 in my sc10 and had to turn down the epa to 55% to make the truck drivable. It's FAAAAAASSSSSST

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Old 09-18-2009, 11:03 PM
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how much does a sc10 weigh compared to a slash, the guy at castle said the slash is to heavy for their system. I didnt buy it to look at it, i want to race
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Old 09-19-2009, 06:19 AM
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Originally Posted by bigblockt-maxx
how much does a sc10 weigh compared to a slash, the guy at castle said the slash is to heavy for their system. I didnt buy it to look at it, i want to race
MY son has a slash and he runs with the CC 4600 had to turn down the epa on it to 80 % to control it, The slash keeps up with everything at the track.

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Old 09-19-2009, 09:48 AM
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Originally Posted by bigblockt-maxx
how much does a sc10 weigh compared to a slash, the guy at castle said the slash is to heavy for their system. I didnt buy it to look at it, i want to race
That's why I had mentioned I think the 5700 is not the best choice for it. If you have to turn the EPA down to 55% just to drive it you are probably running too much motor.
I would seriously consider selling just the 5700 motor and buying a Velineon motor. DON'T buy their ESC as the Sidewinder is far superior but their motors are pretty smooth, can be geared to be very fast and on a track w/2S will be plenty fast enough to keep up and win.
I just TQ'd and won my last couple races with my Slash in Open SC and raced against 2 SC10's and 2 other SLashes. Also running the 17mm wheel conversion which is a MUST to beat the better handling SC10 trucks.
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Old 09-19-2009, 10:56 AM
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Originally Posted by Neu_Racer
That's why I had mentioned I think the 5700 is not the best choice for it. If you have to turn the EPA down to 55% just to drive it you are probably running too much motor.
I would seriously consider selling just the 5700 motor and buying a Velineon motor. DON'T buy their ESC as the Sidewinder is far superior but their motors are pretty smooth, can be geared to be very fast and on a track w/2S will be plenty fast enough to keep up and win.
I just TQ'd and won my last couple races with my Slash in Open SC and raced against 2 SC10's and 2 other SLashes. Also running the 17mm wheel conversion which is a MUST to beat the better handling SC10 trucks.
i think i may just put this 5700 in a t-4 and buy the velinion, thanks for all the help guys
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Old 09-19-2009, 06:34 PM
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in my slash im running the 7700 geared 86/19 epa turned down to 75% running a integy heat sink cooling fan, on 1/8th scale wheels and tires after a 10 min. main, motor temps at 173

Last edited by Darrel Smeltzer; 09-19-2009 at 06:38 PM. Reason: delete
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Old 09-19-2009, 06:35 PM
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in my slash im running the 7700 geared 86/19 epa turned down to 75% running a integy heat sink cooling fan, on 1/8th scale wheels and tires after a 10 min. main, motor temps at 173 sorry for the double message
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Old 09-19-2009, 08:40 PM
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ran my slash this afternoon with a 16/90 gearing and after 5min i temped at 140 on motor and 120 on esc i am running a computer fan on my esc and so far its working greathow did you get that integy heatsink fan work on the slash, i tried mine and it did not fit
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