Choosing a motor and ESC for your Wraith - Gearing Added!

[Sh0rtBus]

Try to think about it like this:

You want a 4:1 gear ratio....that is 4 teeth on the spur to every 1 tooth on the pinion. So pretty much any combination of that should be fine. Keep in mind, though, and I hope I'm saying this right, the higher the number on the spur, the more top end you'll have. Conversely, the lower the number on the spur, the more bottom end you'll have. As long as you keep the 4:1 gear ratio, or pretty close to it, you should be fine.

So if you look at the gearing Harley suggested, 32p 56T/14T, the first number is the pitch of the gears. The 2nd set of number are the teeth count. So the 32P 56T is a 32 pitch spur gear with 56 teeth. If you divide the number of teeth on the spur gear by the number of teeth on the pinion i.e. 56/14, you get 4:1.

 

[arevir]

thank you Harvey now those number make the search easier.

I dint see the 32p 56t kimbrough anywhere. Discontinued???
I did saw the Duratrax TowerHobbies.com | DTXC9397 DuraTrax Spur Gear 32P 56T Nitro Evader BX
and robinson TowerHobbies.com | 2156 Robinson Racing Spur Gear 32P 56T RC10GT
from those 2 which one would fit?

also using a 5mm pinion on a 3mm shaft is a NO-NO or it can work??

 

[maxxa87]

I don't think you're grasping what I'm saying. If EVERYTHING cuts out you need a BEC. If the motor alone stalls then it's probably just gearing.

Here is a rule of thumb for a crawler: Does it have 4 or more wheels? Then you need a BEC.

I don't think you're grasping the question but don't worry about it, thanks anyway. Thinking more about it I think I've been able to answer my own question. The gear set used shouldn't matter, ONLY the end ratio between the gears. The motor and transmission internals will spin the same speed no matter what gears you use as long as the ration is the same. A smaller gear set will spin faster than a larger set so that may wear the gears faster and of course you have the limitations of what gears you can use based on your motor plate. This will help someone out who already has some gears but may have a few holes in their selection. Instead of running out and and, in my case anyway, burning $16 in gas to buy a $4 gear, you can make something work with what you have if you can get the end ratio close to what was recommended. This question is in no way relating to my stalling issue. Only the gear set. I'll try it out if the hobby shop has a wide enough selection of gears and I will see if they have a BEC in stock. Hobby shops a nice trip so it'll wait until next time I'm out that way. For now I have a 80/16 in it so 5:1 ratio to try out. I can also pull the 87t spur off my scx-10 that's torn apart being upgraded to a dually right now anyway.

 

[itpizza]

Can someone suggest me a motor to run on my wraith? I'm looking for some speed more but still good for crawling.
I have a lipo3s 25c and I would like to keep the stock esc, I've already installed a cc bec. Would I need to change gear ratio too?

cheers from Switzerland

 

[madkawi650]

Can someone suggest me a motor to run on my wraith? I'm looking for some speed more but still good for crawling.
I have a lipo3s 25c and I would like to keep the stock esc, I've already installed a cc bec. Would I need to change gear ratio too?

cheers from Switzerland

I run a Traxxas 21 turn 550 size motor from an E-Maxx.. I use a Mmp ESC but my buddy runs his on the stock ESC. It's an awesome combo on 3s lipo. I run 32 pitch sized gears, 13t pinion and 60t spur .. That's equal to 20/90 in 48 pitch gears. Stock wraith is 20/80 which I'm sure would work fine. It would be a bit faster than mine. Mine is faster than stock by just a hair and has GOBS more torque.. Run hard for 1hour and the motor is just barely warm. It also crawls really well too.


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[itpizza]

I run a Traxxas 21 turn 550 size motor from an E-Maxx.. I use a Mmp ESC but my buddy runs his on the stock ESC. It's an awesome combo on 3s lipo. I run 32 pitch sized gears, 13t pinion and 60t spur .. That's equal to 20/90 in 48 pitch gears. Stock wraith is 20/80 which I'm sure would work fine. It would be a bit faster than mine. Mine is faster than stock by just a hair and has GOBS more torque.. Run hard for 1hour and the motor is just barely warm. It also crawls really well too.


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Thanks mate! Did you installed the normal motor (3975) or the reverse (3975R)?

cheers

 

[madkawi650]

Myself and my buddy both use the regular rotation motor.. Just make sure your spinning the right way. Take your spur cover off and look at the end of the motor.. When applying forward throttle, the motor should be spinning counter clockwise. If its not, then your diffs are installed backward.. Happens at the factory on the RTR trucks.
If yours are installed backward you can get the reverse motor or fix your diffs.
Motors need some advance timing and running a motor the wrong direction makes it run retarded timing and it will be under powered and run Hot.


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[itpizza]

Ok than I will check it, thanks mate

 

[scoobyblue]

Can someone suggest me a motor to run on my wraith? I'm looking for some speed more but still good for crawling.
I have a lipo3s 25c and I would like to keep the stock esc, I've already installed a cc bec. Would I need to change gear ratio too?

cheers from Switzerland

Thoght the stock wraith esc is a 2s max. Or 6cell nimh????? I jus looked at the manual, thats what it says for esc
???????????


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[Harley]

Thoght the stock wraith esc is a 2s max. Or 6cell nimh????? I jus looked at the manual, thats what it says for esc
???????????


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It's fine on 3s, just needs a BEC.

 

[Sh0rtBus]

Okay, I don't get it. Took my wraith out today after getting my R2J links installed and the fresh motor broken in and for some reason, it seems to be getting hot pretty quick. I'm talking, 10-15 minutes max. Traxxas 12T 550 Titan with 32p 54/14 and a 2s 35C lipo with stock RTR ESC. No BEC yet, but it's coming in the next day or so with my new HSR5995TG servo. I have them...just need to isntall them. Was too busy wheelin' my 1:1 today to mess with it and too tired right now.

So yeah....any clue why my rig is running so hot on the current set-up? Spur/pinion mesh is good. Only thing I can think of would maybe be that I have the slipper too tight, but I don't know if that makes a difference or not.

HELP!

 

[Harley]

Okay, I don't get it. Took my wraith out today after getting my R2J links installed and the fresh motor broken in and for some reason, it seems to be getting hot pretty quick. I'm talking, 10-15 minutes max. Traxxas 12T 550 Titan with 32p 54/14 and a 2s 35C lipo with stock RTR ESC. No BEC yet, but it's coming in the next day or so with my new HSR5995TG servo. I have them...just need to isntall them. Was too busy wheelin' my 1:1 today to mess with it and too tired right now.

So yeah....any clue why my rig is running so hot on the current set-up? Spur/pinion mesh is good. Only thing I can think of would maybe be that I have the slipper too tight, but I don't know if that makes a difference or not.

HELP!

Take the motor out and check everything spins freely.

I haven't used that motor so I can't say much else about it.

 

[scoobyblue]

It's fine on 3s, just needs a BEC.

Ok cool so the ae2 esc or what ever its called, a stock wraith esc will run on a 3s. Awesome. Ill give that a wip. And ive got a a ubec, and a hobbywing bec both only go as far as 6v and im useing a 14kg torq servo. 6v. That should be ok shouldnt it. The ubec is switchable from 5v to 6v. And both say 3a to 6a. ???? That should be ok shouldnt it???

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[Harley]

Ok cool so the ae2 esc or what ever its called, a stock wraith esc will run on a 3s. Awesome. Ill give that a wip. And ive got a a ubec, and a hobbywing bec both only go as far as 6v and im useing a 14kg torq servo. 6v. That should be ok shouldnt it. The ubec is switchable from 5v to 6v. And both say 3a to 6a. ???? That should be ok shouldnt it???

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I'm not familiar with either of those. I always suggest Castle BEC's but those will probably work still.

 

[scoobyblue]

I'm not familiar with either of those. I always suggest Castle BEC's but those will probably work still.

Ok cool. Well here is a pic. All 3 bec I have are this type.

They are not real good pics but it may giv u an idea. But a 3s and my titan 21t sounds like a good go. Pitty the titan wont fit me gmade r1. The can is to long but oh well

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[Harley]

I don't trust a 3A to be enough. The Castle is a 10A, and it's not enough to run two servos off of.

 

[scoobyblue]

I don't trust a 3A to be enough. The Castle is a 10A, and it's not enough to run two servos off of.

Ok no I see. But mine does say 3a to 6a. But I geuse I have same trouble then. Servo seems stronger but still seems to lak the torq still in a way. Ill jus av to get a cc bec to sure and safe.
Jus another qeustion. Do u think maybe that the stock gearing will be ok for a lil hi speed, well stock speed anyways, but still ok for trail crawling? Jus to clarify, stock esc, 21t titan, and stock gears on a 3s 11.1 lipo? Im sure its been asked or covered before, but this thread has so many different uses and im jus confused to hell. Cheers man for all ya help ay. Its helped out alot bud

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[itpizza]

Myself and my buddy both use the regular rotation motor.. Just make sure your spinning the right way. Take your spur cover off and look at the end of the motor.. When applying forward throttle, the motor should be spinning counter clockwise. If its not, then your diffs are installed backward.. Happens at the factory on the RTR trucks.
If yours are installed backward you can get the reverse motor or fix your diffs.
Motors need some advance timing and running a motor the wrong direction makes it run retarded timing and it will be under powered and run Hot.


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The traxxas motor fits to the stock slot or you had to modify something?

 

[madkawi650]

The traxxas motor fits to the stock slot or you had to modify something?

You'll have to grind a tiny bit of the lower link mount for the end of the motor to sit down properly. I did mine with a dremmel.. It was super easy. Take out the 8 skid plate screws and the whole plate drops down giving you all the room you need to work and install motors etc.

Again.. I'm running 32 pitch gears.. 13/60 on a 3s lipo on my 21t Titan and it runs awesome.. Tons of torque and a hair faster than stock. Motor runs just barely warm after 1/2hour or more of trail bashing and hill climbs..

Just take 13 divide it by 32 ( 32 pitch ) then multiply it by 48 (48 pitch) to get the equal number of teeth on a 48 pitch pinion.
Sooo, I'm running about 20/90 in 48 pitch if you convert it.


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[Harley]

Ok no I see. But mine does say 3a to 6a. But I geuse I have same trouble then. Servo seems stronger but still seems to lak the torq still in a way. Ill jus av to get a cc bec to sure and safe.
Jus another qeustion. Do u think maybe that the stock gearing will be ok for a lil hi speed, well stock speed anyways, but still ok for trail crawling? Jus to clarify, stock esc, 21t titan, and stock gears on a 3s 11.1 lipo? Im sure its been asked or covered before, but this thread has so many different uses and im jus confused to hell. Cheers man for all ya help ay. Its helped out alot bud

sent via crappa talk 2 from my gmade r1

It could work but watch your motor temps.