Spurs pinions teeth and pitch huh?

[garnold]

My new slash I bought pre-built came with the TA slipper clutch mod installed. What is the difference between the TA spur and the Traxxas one? The kit also came with a bunch of pinion gears for the supplied TA spurs that where included. I also have a stock slash roller that I bought and used one of the pinions on this rollers stock spur and it worked just fine. So now I'm confused? What is the difference between these spurs? How can I even tell? I also ask this because I'm trying to setup gearing and not sure what to do because I'm not sure if the TA tooth count can be compared the samevway as the Traxxas.

[I EAT DIRT]

if they are both the same pitch on the gear's then yes you can gear them the same way as the traxxas gear's.

[garnold]

if they are both the same pitch on the gear's then yes you can gear them the same way as the traxxas gear's.

So how would I know? Other than just figuring out what was installed can this be eyed?

[I EAT DIRT]

Alot of time's the gear's will say the tooth count and pitch on them, not sure if TA does the same.

[franzD1]

http://www.scriptasylum.com/rc_speed/gear_calc.html
Use the calculator below to figure out various gear specifications given two of the following; tooth count, diameter, and/or pitch
Calculate Gear Pitch
Tooth Count:
Diameter:
Pitch:


it is gonna be boring maybe. but most of the questions asked here @ the traxxas forum about speed and pinions
are conna be answered here with this site
http://www.scriptasylum.com/rc_speed/index.html

[Trubble]

...came with the TA slipper clutch mod installed.

I Googled this and didn't come up with much, I can only assume you're referring to some kind of modification using Team Associated gears.

What is the difference between the TA spur and the Traxxas one?

The Traxxas spur gear bolts onto a complete slipper unit. Three bolts near the center, and it's off, slipper unit (and it's adjustment) stays intact. On a typical stock RC10 application, the Associated gear is sandwiched in the middle of the slipper and cannot be changed without disrupting your slipper adjustment.

I also have a stock slash roller that I bought and used one of the pinions on this rollers stock spur and it worked just fine.

Makes sense. I looked up the stock spur gear for an RC10, and it's 48 pitch, same as the Slash's stock spur, so no big surprise there.

So now I'm confused? What is the difference between these spurs? How can I even tell?

The Traxxas spur will have three holes near the center, probably with shoulders around them, and the gear will be offset noticably from the center mounting surface (when viewed from the side). The Associated gear should have an octagon molded into the center surface, and the gear teeth should be fairly well centered (when viewed from the side). Probably different tooth counts, too, dunno.

I also ask this because I'm trying to setup gearing and not sure what to do because I'm not sure if the TA tooth count can be compared the samevway as the Traxxas.

If you ran a TA pinion with a stock Traxxas spur, then it sounds like they're both 48 pitch, and the numbers should be comparable between the two.

[garnold]

Thanks for all that info! I'm sorry I could have given better info on the spur setup. You are correct it is a modified spur and slipper setup. Here is what I have.

CNC Machined HD Lay-shaft to Convert to AE V2 Slipper Clutch

I'm hoping that is a better description of the setup.

[Trubble]

That helps quite a bit, thank you.

Looks like Associated gives you choices of 72,75,78,81, & 84 teeth. I think with the stock Slash you're limited to 83,86, & 90, so your gearing won't be identical, but with a conversion calculator as linked above, you should be able to get close.

And it looks like Associated stamps the number of teeth on the inner web of the spur, so you'll hafta disassemble your diff to see how many teeth you got. (Or mark one with paint, and start counting) Enjoy.

[garnold]

Ok so let's just say I want the thing to go like a bat out of **** and I toss in a 72 spur and a low to high 20 tooth pinion, what should I be looking for in the way of car safety? I'll be running a 2s lipo with the sidewinder 3800 motor setup. Here's a little more about the battery because I know this is important.

4200mah
35C, 50C Burst
2S1P
142x44x22mm Align
balancing plug

[CarGuy7a]

Looks like Associated gives you choices of 72,75,78,81, & 84 teeth. I think with the stock Slash you're limited to 83,86, & 90, so your gearing won't be identical, but with a conversion calculator as linked above, you should be able to get close.
.

Don't forget there is also an 87 tooth Associated spur that you can run as well.

Ok so let's just say I want the thing to go like a bat out of **** and I toss in a 72 spur and a low to high 20 tooth pinion, what should I be looking for in the way of car safety? I'll be running a 2s lipo with the sidewinder 3800 motor setup. Here's a little more about the battery because I know this is important.

Really you can run whatever gearing you want. If you are just going to run a couple quick speed run passes, gear it for as much top speed as you can get away with without the motor or ESC temps getting too hot. Really with gearing you have to check your ESC and motor temps to tell you what gearing to run for certain running conditions.

[Trubble]

........and I toss in a 72 spur and a low to high 20 tooth pinion, what should I be looking for in the way of car safety?

Uhhhh, stock gearing in my brushed Slashes are 18/86, you're looking at dropping 14 teeth on the spur AND raising the pinion by 2-12 teeth? Ouch. Even more concerning is you've gone UP in kV from the VXL. All I can say is I hope you're going to stay on pavement, and doing strictly speed runs and nothing else. Even at that, expect very slow, sluggish takeoff with some pretty big amp draw until you get rolling. "Going thermal" would, IMO, be pretty much guaranteed. Might not be a bad idea to add vent holes, and maybe even a deflector to make sure that ESC gets some breeze. If I were just doing speed runs, I think I'd start with a 22/81 or 24/81 and see how that works, if the temps weren't bad, then it'd be safe to continue pushing it.

I'll be running a 2s lipo with the sidewinder 3800 motor setup.

I do commend you on staying with 2S, I really think you'll have some serious issues if you try 3S. The MMM 2200 probably would have been a better choice for power (if it even fits), but since this is whatcha got, gotta find a way to run with it and be happy.

Don't forget there is also an 87 tooth Associated spur that you can run as well.

Was not aware of that, thank you for the input.
(all my info came from the STRC website, didn't go looking for what was available, just what was suggested)

[garnold]

Thanks Trubble this is the kind of info that I need to make some better gearing and not wreck my truck. So what I settled with is 28/81 to just start playing around. I'm sure I'll end up dropping the pinion gear but thought this might be a safer starting point. These trucks with brushless motors go fast enough already so I don't want to bust anything. I'm only asking these questions because maybe I'm leaving some speed on the table that I could be using and not knowing it Again, I thank you for the information!

[franzD1]

@ garnold,
72t spur / 20t pinion + 2s lipo gives almost 42 mph
72 / 20 with a 3s lipo pushed you to a ( theoretically ) to 62 mph

81 / 28 + 2s goes to 52mph

have you checked this,..? http://www.rctek.com/technical/gearing_charts.html
lots of info, good for finding the combination you want

[garnold]

franzD1 thanks for this! Looking at it that way I'm sure to reduce my pinion gear. The track I'd like to race at just is not big enough to ever get to those speeds. I rather trade that top end for some "jump off the line" starts Now I guess after I mess with this it's all about suspension and tire selection. What good is all this power if the tires just spin out of control right? Lot's to tinker with..

toe in/out
camber
caster
anti squat
shock springs and oil
not to mention the dif oil changes I can try in this Fastlane sealed dif

OMG what did I just do, sign up for NASCAR!!!

[LessthanMetal]

..and tire selection. What good is all this power if the tires just spin out of control right? Lot's to tinker with..

Tires are going to be your biggest investment imo. I know they're mine. Got 3 rear sets and 2 front stock sets.

Keeping on the subject of the gears and gear pitch, may not be the right place to ask this but...I was wanting to know if the 32p spur gears that are on the SC10 4x4 would work and with same slipper pad P/N. I race in a very sandy area. Running the 48p and gear cover (for rules) + sand = very quick gear wear. I've tried the traxxas 32p Spur with a 32p RR pinion, with good results. I can't race with it like this though due to "gear cover rules". Its the only think keeping me from buying this strc layshaft.

[Spudz27]

Tires are going to be your biggest investment imo. I know they're mine. Got 3 rear sets and 2 front stock sets.

Keeping on the subject of the gears and gear pitch, may not be the right place to ask this but...I was wanting to know if the 32p spur gears that are on the SC10 4x4 would work and with same slipper pad P/N. I race in a very sandy area. Running the 48p and gear cover (for rules) + sand = very quick gear wear. I've tried the traxxas 32p Spur with a 32p RR pinion, with good results. I can't race with it like this though due to "gear cover rules". Its the only think keeping me from buying this strc layshaft.

In my topic of upgrades Mr Wolf stated he uses the 2mm spacers from the shock parts you get with your slash, just under where the screws go, and this means the gear cover can fit back on, with longer screws, not sure if it would still be legal or not in your races, but it is an idea.

[LessthanMetal]

In my topic of upgrades Mr Wolf stated he uses the 2mm spacers from the shock parts you get with your slash, just under where the screws go, and this means the gear cover can fit back on, with longer screws, not sure if it would still be legal or not in your races, but it is an idea.

Sounds like a good idea, I'll give it a try this weekend when I'm racing Mod. Still would like that Strc layshaft, but would like it with 32p...

[Spudz27]

Yeah his spacing was for use with Jato 54T

[Mr Wolf]

Sounds like a good idea, I'll give it a try this weekend when I'm racing Mod. Still would like that Strc layshaft, but would like it with 32p...

I haven't done this mod but believe you can have the STRC layshaft with 32P, you just need AE part #7955 (a 54T 32P spur for RC10GT2 nitro truck). Two other sized spurs are available but I know that size would work well under the gear cover.

You then need the other AE parts STRC suggest for the conversion, being #9603 (pads), #9604 (hub), #9605 (spring) and #6629 (nuts).

I'm thinking of doing this conversion myself but only because I'm interested in getting a stronger and smoother (less grabby) slipper clutch. The cheap 54T Jato conversion gets you the fully durability benefits of 32P for only $3 and, as I've explained elsewhere, you can easily get the cover back on with a small mod.

I'll probably wait until my current TRX slipper pads are worn out and replace with an STRC shaft and 32P AE slipper set-up.

[garnold]

That is the setup I have in my truck and it seems pretty nice. The AE slipper is quite cool.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=280721584143

[Mr Wolf]

That is the setup I have in my truck and it seems pretty nice. The AE slipper is quite cool.

http://cgi.ebay.com/ws/eBayISAPI.dll...m=280721584143

Thanks for confirming that, I thought it would work I will now be able to buy the parts with more confidence!

[hurley747]

81 / 28 + 2s goes to 52mph

Based on My recent speed tests that is not happening

Google RC calculations their is a very helpful site that pops up

P.S. The web address is somethig like scryptasylum

[franzD1]

Based on My recent speed tests that is not happening

Google RC calculations their is a very helpful site that pops up

P.S. The web address is somethig like scryptasylum

theoretical speed ;-)
Above approximately 45mph, wind resistance and drivetrain drag plays a large role in the reduction of the theoretical top speed.

andthe link you are reffering to, is here on this page / topic @ post #5

and the numbers i placed here are for the topicstarter who has not the stock motor in his slash,