Can I use this gear and pinion

[bow2986]

Hi fellas, I am so new to rc cars so this might sound stupid , I normally fly rc helis but it's nearly allways to windy so I purchased a rc10, its not my first rc car , that was a super champ back in the 80's.....but it's definitely my fav. I am using the spare electronics I have from my rc bike, question is if I can or not
I have a spare hobbywing v3 120 amp esc and a spare 13.5t motor. What pinion would I need to be able to keep the car drivable using this motor and esc combo. The "spur" gear or big cog on the back is 54 tooth? Can I even use this combo? It's only the normal 6 gear version pan although I will buy a stealth gearbox for it once it's up and running..
So with the old 6 gear tranny, 13.5 t motor and v3 esc what pinion would be best, I have no idea so I would really appreciate any ones advice, thank you
Mick

[Russ Winn]

You may want to change to a 48 pitch gear on the spur (81 tooth is the same as 54), so you can have modern gearing choices. I'm running a 13.5 brushless with 5000mah Lipos in a 6gear, and started with a 23 tooth pinion (15t in 32 pitch) and it was fast, but plenty driveable. I've since geared down to 20 for the track I'm running, but if you're in open space, it won't matter. Just don't go so high as to overheat the motor.

[bow2986]

Hi, thanks for the reply....I am very limited where I live in the hobby section, only one shop in town with limited stock..
I managed to get a 48 pitch 87spur and a 23tooth pinion, can I use this gearing with my 13.5t motor and the six gear case in my rc10 with out cooking or overpowering it, If not what should I change. I can get other pinions here now but will have to wait a week or two for different spur gears, what do I need to do? Please help
Mick

[Russ Winn]

You're fine with those. It's only equal to a 15/58 in 32 pitch. (87 divided by 1.5). The power isn't too much for it. The problem would be OVERgearing, which would make the motor run hot. What batteries are you using?

[bow2986]

Hi, I have an old rc10 with 6 gear tranny I'm restoring, and struggle to get parts where I live for it. The only spur I could buy in 48 pitch is a 87t spur and a 23t pinion, can I use this pinion and spur gear set- up with my 13.5t motor and hobbywing V3? If not what should I change, I don't want it to over power and destroy the car since it is pretty old, I just need to know if I need to change or what I should change......also can a stealth tranny be fitted to the old 6 gear rc10, is it a straight fit or do I have to drill more holes, there are no other holes in the rear of my tub besides the ones my 6gear is screwed into, I would really appreciate some advice on this, thank you
Mick

[bow2986]

Thank Russ, I never seen your reply and just posted the question again, if I had seen your reply I wouldn't have, so I can go ahead and put the spur and pinion on. Batteries I will be using will be 7.4v 2cell, 4000 or 5000 mah 30c?

[Russ Winn]

Hi bow, The spur gear you have selected will work fine on the 6 gear. It is slightly larger than a "stock" gear, but that will give you a little more low end torque. I've run a 23 tooth pinion with an 81 spur, with no problems (however, it was too tall for the track I'm running). If you've serviced your gearbox properly, use bearings, and don't do things like go from reverse to wide open forward on a high traction surface, you will be fine with the setup you have...enjoy.

Someone made a template (I forget who) where you could drill for the stealth tranny. The best bet is to find another chassis tub on ebay, or somewhere....It's much easier (and accurate) than re-drilling.

[Jay Dub]

Post pics of the underside of the rear of your chassis. Many of the late 6 gear cars also had holes for the stealth tranny (which may be the xtras holes you speak of). As far as gearing is concerned, you are in a good range for that car and motor combo. HOWEVER, one thing most people don't understand about the HP limited motors (13.7, 17.8, 21.5 etc) is that because you can run them for so long that they carn become overheated. These motors (for the most part) are designed for racing applications. Because of this they are made to be geared and run for 5 minutes. You can run them for longer, but you will need a lower gear. One other thing that most people don't understand is that you CAN undergear a motor and cause heat issues as well. This is because it is out of it's power band (when being run at full throttle for extended periods of time for example), and is not at maximum effieciency for the type of driving being done. Unfortunately there is no "formula" for this other than trial and error. You are currently in the ball park, so just check your temp every few minutes while running until you find the gearing that properly fits your driving style and application. -Jeff