no torque on crawling

[kingofthecrate]

I built a bomber and went with a losi 13.5t brushless and had to swap out a LRP esc to a hobbywing 35 amp esc.. I have the speed but when I go to crawl, it just feels like I don't have torque to crawl over anything, I can here the motor spooling but no transfer to the wheels.. Any suggestions on where or what to look for?

[Jboucher]

My guess would be not enough power for a big 2.2 rig?

35amp seems really low but I don't know much about brushless systems

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[TheLetterJ]

Slipper clutch too loose? 35A esc does sound small for a faster (which generally means it will pull more amps under load) 540 sized brushless in a relatively heavy car, maybe you're experiencing brown-out?

[kingofthecrate]

Originally Posted by TheLetterJ

Slipper clutch too loose? 35A esc does sound small for a faster (which generally means it will pull more amps under load) 540 sized brushless in a relatively heavy car, maybe you're experiencing brown-out?

Ill have to look to see what brownouts mean for the RC world, now that you mention the slipper clutch, I am wondering if thats what it is, it does sound/feel like a slipping issue.. getting access to the motor is a pain in the ass on these, is there an easier way to remove the cage? looking at it seems like i'd have to take apart quite a bit of the car to access it.. It was a kit already built from someone else, I just took the care over and jumped down the proverbial rabbit hole of rock crawling

[LSXGMC]

Yeah, electric motors don’t “spool”, so it’s likely the slipper clutch.

[BOMBERINOZ]

A smaller pinion gear will give it more torque but of course it will lose top speed also

If you want to do lots of crawling you want a smaller pinion gear & larger spur gear, the gear ratios might simply be too high for what you are trying to do???

Check the pinion & spur gear tooth count & someone will let you know for sure if it is not setup for crawling

[JatoTheRipper]

13.5T motor, which is probably 2-pole, in a Bomber is probably enough, on its own, to make it lack torque.

[kingofthecrate]

Originally Posted by JatoTheRipper

13.5T motor, which is probably 2-pole, in a Bomber is probably enough, on its own, to make it lack torque.

Its got 3 wires soldered to it

[JatoTheRipper]

Originally Posted by kingofthecrate

Its got 3 wires soldered to it

That's because it's brushless and 3 phase. The amount of wires say nothing about the amount of poles.

[kingofthecrate]

Also it's got a hobbywing 10bl120 120a esc in it.

[Jboucher]

Then it's 120amp not 35 which is fine for the truck.

Check the slipper clutch, tighten it and give us an update.

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[Jim85IROC]

I ran a 13.5t motor in my Bomber briefly. While it's got nowhere near the torque of other motors, it's still got substantially more than any brushed motor. As others have suggested, try tightening your slipper clutch. If that's not the problem, it could be stripped gears somewhere, but I'm putting my chips on the slipper.

[kingofthecrate]

Originally Posted by Jim85IROC

I ran a 13.5t motor in my Bomber briefly. While it's got nowhere near the torque of other motors, it's still got substantially more than any brushed motor. As others have suggested, try tightening your slipper clutch. If that's not the problem, it could be stripped gears somewhere, but I'm putting my chips on the slipper.

winner winner chicken dinner!!!

Tightened down the slipper and she's crawling like nobody's business now..

Thanks everyone!!!

[JatoTheRipper]

Originally Posted by kingofthecrate

winner winner chicken dinner!!!

Tightened down the slipper and she's crawling like nobody's business now..

Thanks everyone!!!

You didn't hear it spinning?

I thought that was the first thing you would have checked. Good to know it's fixed.

[kingofthecrate]

Originally Posted by JatoTheRipper

You didn't hear it spinning?

I thought that was the first thing you would have checked. Good to know it's fixed.

I am a month into this hobby but guess what? Ill never ask that question again..

[JatoTheRipper]

Originally Posted by kingofthecrate

I am a month into this hobby but guess what? Ill never ask that question again..

Sorry, I should have worded my post differently.

Don't get offended or upset. Things in text don't always come off how they were meant in person.

[kingofthecrate]

Originally Posted by JatoTheRipper

Sorry, I should have worded my post differently.

Don't get offended or upset. Things in text don't always come off how they were meant in person.

Oh no offense takin at all.. I was just saying that I am addicted to this but there really is a lot to learn.. I have a polaris rzr that I have built up and even though the concepts are the same, they are entirely different but I am enjoying this hobby very much so..

You think I would benefit from running a slipper eliminator?

[Jboucher]

If you tighten the axial slipper all the way, it's basically an eliminator as long as the nut doesn't strip or back out.

I feel it's safer to have a cheap weak point in the driveline, just like the plastic spur.

Easy fix when you bind the truck and it can save expensive parts.

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[JatoTheRipper]

Originally Posted by kingofthecrate

Oh no offense takin at all.. I was just saying that I am addicted to this but there really is a lot to learn.. I have a polaris rzr that I have built up and even though the concepts are the same, they are entirely different but I am enjoying this hobby very much so..

You think I would benefit from running a slipper eliminator?

It is a lot to learn, but a lot of fun!

I don't run slipper eliminators, but I do tighten my slipper clutches all the way down. I don't want my slipper clutch to slip. I'll take the change of breaking something, but honestly if you learn to let off the throttle in a bind you shouldn't have an issue. That's been my experience anyway.

There are other people that think the slipper clutch is a safety net and they want it to slip before it munches any gears or breaks any parts.

[Jim85IROC]

I like having the slipper. On my Bomber, because that truck could end up airborne off of the occasional jump or tree root, it gives me a little peace of mind. On the trails, I rarely encounter situations where it slips, but when it does, it's usually because a wheel is bound up tight enough that the truck wasn't going to escape anyway.

On my Gen7 I'm going to convert to a slipper assembly because that is the truck that my son uses. Point here is that if you've got a truck being used by a kid or somebody else who is inexperienced, a slipper is a good idea.