SCX speed question
 

Here's a quick question for you guys...

I replaced the motor and ESC, in my dingo, from a Tazer 10 turn LIPO Sade ESC with drag brake and a 550 stock motor, too a Hobbywing Juststock 21.5 sensored brushless system.

Still running the standard spur/pinion gears, but my wheel speed has dropped. The brushless system is 3s compatable. So my question is, which avenue to pursue?

Pinion/spur change, or 3s conversion.

I was happy with the old speed, but I am worried about the speed increase with 3s...

Please help..."thumbsup"

Re: SCX speed question
 

going up on the pinion will give you more speed ...Maybe try a 23/24 tooth pinion..just watch your temps.

I cant say what is good gearing with a 3s but someone will im sure.

Re: SCX speed question
 

Increasing voltage allows you to retain low speed control and still have a bit more speed. Probably would be the best from a pure performance viewpoint. If you have an investment in 2S batteries already then play around with the gearing, it is unlikely you will stress a 21 turn brushless no matter what the gearing on an scx10, but as sharky says, monitor temps.

Re: SCX speed question
 

Thanks for the advice guys...

I found a solution. I recently bought another SCX10 honcho, and today I decided to strip it down and rebuild it. I was looking over the parts, and found the spur/pinion in the new SCX10 to be 80/23. So I opened the Dingo, and checked the spur/pinion in the Dingo. To my surprise, I found it to be 87/13. Now I understand my wheel speed problem. Simple solution, swapped spur/pin ions over and my wheel speed is much better..."thumbsup"

Re: SCX speed question
 

Hmmmm..I guess only the RTR models come with 87/20 gearing...Shrugs*

Re: SCX speed question
 

You have a lot more speed possible going higher than a 13 Tooth.

I would try a 16T..would be night and day difference and still have plenty of torque.

Again; just watch motor temps

If for any reason you find yourself breaking spur gears you may want to consider moving to 32 pitch gears instead of the 48P.

Re: SCX speed question
 

Thanks dude

Basically, what I did was install the 80 tooth spur and 23 tooth pinion into my Dingo, with the 21.5 turn brushless, 1600KV @ 8.4 volts, and she's back to more or less the same speed it was before.

81/23 = 27.09
87/13 = 51.48

So you can see the difference between the 2 different final drive ratios."thumbsup"

Re: SCX speed question
 

Oh, and the 550 can claims 20 000 rpm @ 12 volts, so I'm assuming @ 8.4 volts it would be around 14 000 rpm. More or less the same...

Re: SCX speed question
 

Just watch your temps especially under load such as crawling and full speed blasts..You want a compromise of speed and torque basicly...to far either way isn't really a good compromise.

But if doesn't get hot and you like it then that's what you should keep it at.

Re: SCX speed question
 

Oh and lastly, I installed my telemetry temp sensor into the Dingo, what temp should the motor get too?

Re: SCX speed question
 

I would try to stay in the 130-135 range maximum for brushless..you can maybe go higher but heat is a killer of motors.

I guess this technique applies as well for brushless...If you can put your finger on the motor after running out a pack and hold it there for 5 seconds without needing to take your finger off because its too hot then your ok.

If you cant then it may be getting too hot

Re: SCX speed question
 

You can go to 170* on brushless. 80/23 is a lot of gear for crawling...unless you want more top end.

Re: SCX speed question
 

We ran the trucks on Friday, and she ran perfect. I agree with you on the gearing being a bit high, but for now it's fine. Next time I'm at my local hobby shop I'll pick up a 20 tooth pinion..."thumbsup"