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Old 03-01-2020, 06:37 PM   #1
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Default Need help with gearing

So Iím pretty new to rock crawling. I recently got a pretty good deal on a rr10 bomber and it came with the factory motor and a castle creations sidewinder 3 and 1406 4600kv and what I can assume is the stock gearing that came with the original rtr bomber. Iím not sure if the gearing is the right set up for the motor. Any help would be great. Today I ran 1 full battery and Iím assuming it got hot and went into thermal shutdown. Iím not really looking for speed I just want to be able to crawl around and if I need to still have a little speed.
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Old 03-01-2020, 07:13 PM   #2
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Default Re: Need help with gearing

that motor is a bit fast if crawling is your main goal. id recommended something around 2700kv to 3100kv for crawling. if thats not an option at this time and gearing is your only choice, the stock pinion is 12t and spur is 64t, going to around 10t pinion would help a bit. still id change that motor out for something slower.

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Old 03-01-2020, 08:44 PM   #3
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Default Re: Need help with gearing

Iíll have to check again and make sure thatís the correct kv i have
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Old 03-01-2020, 09:13 PM   #4
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Default Re: Need help with gearing

You can get the hotracing 2 speed kit and just leave it is 1st gear, maybe add a cheap servo later. A 21turn trail master and a 9t pinion also. Maybe a new esc like a hobbywing 1080 for downhill control. If you bought it for rock crawling and going slow, does it still feel like a good deal? This is only like $130 but it will make a big difference.

I can't remember if a 550 motor fits right in or not. Ripped that transmission out years ago.
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Old 03-01-2020, 09:19 PM   #5
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Default Re: Need help with gearing

550 fits easily stock

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Old 03-02-2020, 05:03 AM   #6
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Default Re: Need help with gearing

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Originally Posted by Voodoobrew View Post
You can get the hotracing 2 speed kit and just leave it is 1st gear, maybe add a cheap servo later. A 21turn trail master and a 9t pinion also. Maybe a new esc like a hobbywing 1080 for downhill control. If you bought it for rock crawling and going slow, does it still feel like a good deal? This is only like $130 but it will make a big difference.

I can't remember if a 550 motor fits right in or not. Ripped that transmission out years ago.
I though about buying the 2 speed but I heard it makes the drivetrain weak. I donít really want to replace the motor since itís brand new. I have the stock motor and esc as well. I was just hoping to change the gearing to make the engine run cooler. And it was a good deal still Iím fine with it going fast I just donít want to burn up the motor
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Old 03-02-2020, 10:07 AM   #7
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Default Re: Need help with gearing

I'm running a 3300kv sensored brushless on stock gearing and it's hella quick. I can't imagine 4600kv. If you really want to keep that motor, try a smaller pinion and 68T spur. I wouldn't even bother with 10T - get an 8T or 9T.
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Old 03-02-2020, 10:12 AM   #8
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Default Re: Need help with gearing

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Originally Posted by Mletchworth View Post
I'm running a 3300kv sensored brushless on stock gearing and it's hella quick. I can't imagine 4600kv. If you really want to keep that motor, try a smaller pinion and 68T spur. I wouldn't even bother with 10T - get an 8T or 9T.
It is super fast for a rock crawler. I need to confirm which motor I have tonight I just went off what the box said that came with the truck. It might be the wrong box honestly
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Old 03-02-2020, 10:45 AM   #9
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Default Re: Need help with gearing

Any 4600kv motor will be fast, and I don't know any that have good startup for crawling. A good racing motor will be junk in a crawler. They are designed for different purposes like forks and spoons.

You can change the spur and pinion out to 68/9 so instead ongoing 26mph you will only go 21.5mph... The 2 speed can drop it down to 9.5mph from there. New axles can get you to 7.33mph after gears and 2speed.

If you try to crawl with that motor it will not be a good experience IMO.

Sell the motor before you burn it up trying to crawl with it and buy the 550 motor...

Lowering the volts to slow it down will not work well either.

If you have the stock motor. I cant believe I'm saying it, but the stock motor is better than what you have in there now, for rock crawling at least.

Just because a motor is new doesn't mean it's good, or that it will suit your needs.

If you are rock racing then maybe... But probably not.

I still recommend the hot racing 2 speed. Yea, it's not bullet proof, but it's the best way to drop your gearing enough to do anything resembling rock "CRAWLING".

You can drop to 48p gears and go with a 96t or 102t spur. if you need to stay single speed. I wouldn't say its a better Idea then the 2-speed though.

The sidewinder 3 is an OK esc for its age. But its missing many features of todays esc's. You cant set to brake to ramp up, so it is just all or nothing (strength is variable, just not delayed). Newer esc's allow you to drive downhill slow too or have "active drag". The bec on the SW3 is also not strong enough to power some of the beefier servos we use for crawling.
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Last edited by Voodoobrew; 03-02-2020 at 11:12 AM.
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Old 03-02-2020, 12:22 PM   #10
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Default Re: Need help with gearing

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Old 03-03-2020, 06:22 AM   #11
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Default Re: Need help with gearing

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Originally Posted by Voodoobrew View Post
Any 4600kv motor will be fast, and I don't know any that have good startup for crawling. A good racing motor will be junk in a crawler. They are designed for different purposes like forks and spoons.

You can change the spur and pinion out to 68/9 so instead ongoing 26mph you will only go 21.5mph... The 2 speed can drop it down to 9.5mph from there. New axles can get you to 7.33mph after gears and 2speed.

If you try to crawl with that motor it will not be a good experience IMO.

Sell the motor before you burn it up trying to crawl with it and buy the 550 motor...

Lowering the volts to slow it down will not work well either.

If you have the stock motor. I cant believe I'm saying it, but the stock motor is better than what you have in there now, for rock crawling at least.

Just because a motor is new doesn't mean it's good, or that it will suit your needs.

If you are rock racing then maybe... But probably not.

I still recommend the hot racing 2 speed. Yea, it's not bullet proof, but it's the best way to drop your gearing enough to do anything resembling rock "CRAWLING".

You can drop to 48p gears and go with a 96t or 102t spur. if you need to stay single speed. I wouldn't say its a better Idea then the 2-speed though.

The sidewinder 3 is an OK esc for its age. But its missing many features of todays esc's. You cant set to brake to ramp up, so it is just all or nothing (strength is variable, just not delayed). Newer esc's allow you to drive downhill slow too or have "active drag". The bec on the SW3 is also not strong enough to power some of the beefier servos we use for crawling.
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Handy gearing spreadsheet
The truck just came with the set up. I kinda had an idea that Iíd have a little problems with it when I got it. As far as the 2 speed goes I think Iíll be adding it eventually.

I also will agree with the esc not being a very compatible for crawling. I guess I just need to figure out whatís the best option for a new motor combo. I donít plan on upgrading anything too fast right now as I want to kinda slowly upgrade.
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Old 03-03-2020, 05:48 PM   #12
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Default Re: Need help with gearing

For crawling a brushed crawlmaster 10t pro is pretty hard to beat. Crawlmaster 12t sport or trailmaster 21t 550 sport is pretty good bang for the buck.

2200 puller pro standard if you want brushed. Many prefer the 2700kv but I like the 2200kv and more voltage on a mamba x.

Those will all drop the speed considerably and crawl much better as well even with out changing gears.

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Old 03-05-2020, 11:28 AM   #13
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Default Re: Need help with gearing

Quote:
Originally Posted by Voodoobrew View Post
For crawling a brushed crawlmaster 10t pro is pretty hard to beat. Crawlmaster 12t sport or trailmaster 21t 550 sport is pretty good bang for the buck.

2200 puller pro standard if you want brushed. Many prefer the 2700kv but I like the 2200kv and more voltage on a mamba x.

Those will all drop the speed considerably and crawl much better as well even with out changing gears.

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Which mamba x is the best as far as kv for the motor ?
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Old 03-05-2020, 06:01 PM   #14
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Default Re: Need help with gearing

Kv or speed per volt is set by the motor. The esc has minimal effect on kv.

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