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Old 01-07-2013, 09:23 PM   #10996
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Thanks! I love this forum! The drive train ratio was where I was hung up. I couldn't find it anywhere and didn't feel like taking the diff apart and count teeth. Where can I find the info? I didn't see it in the manual. The drivetrain ratio on my TC6.1 is 2:1
LOL, not to insult your intelligence, but the internal DR is mentioned a few times in this big thread. Also, it's listed on the first page of the manual.
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Old 01-07-2013, 09:54 PM   #10997
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LOL, not to insult your intelligence, but the internal DR is mentioned a few times in this big thread. Also, it's listed on the first page of the manual.
Ha ha! This is a big thread. Also, there are a lot of words in that manual! Thanks though!
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Old 01-08-2013, 09:17 PM   #10998
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Okay. Still trying to figure out gear ratios and what not. It seems the one listed in the manual, are for older brushed motors. I'd like to be at about 4.10 FDR or so for a 17.5T brushless motor. The car comes with a 72T spur. To get to that FDR, I'd need a pinion that is way too big to fit. I can't seem to find a 48 pitch spur smaller than 69 teeth. Even then, I'd need a spur that's too big. Do you guys use 64P spurs? What am I missing here?
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Old 01-08-2013, 09:45 PM   #10999
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Originally Posted by KC10Chief View Post
Okay. Still trying to figure out gear ratios and what not. It seems the one listed in the manual, are for older brushed motors. I'd like to be at about 4.10 FDR or so for a 17.5T brushless motor. The car comes with a 72T spur. To get to that FDR, I'd need a pinion that is way too big to fit. I can't seem to find a 48 pitch spur smaller than 69 teeth. Even then, I'd need a spur that's too big. Do you guys use 64P spurs? What am I missing here?

Hope that helps.

*EDIT* Sorry I misread your 4.1FDR, I was just trying to give you an idea because I use a 60T spur.

You can get a 48P 55T spur and a 48P 33T pinion to achieve 4.125 FDR.

Last edited by ChrisNRG; 01-08-2013 at 09:51 PM. Reason: More info.
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Old 01-08-2013, 09:52 PM   #11000
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Hope that helps.

*EDIT* Sorry I read your 4.1FDR

You can get a 48P 55T spur and a 48P 33T pinion to achieve 4.125 FDR.
Thanks for the info! Those holes won't line up though, will they? That has eight holes. I need one with six.
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Old 01-08-2013, 10:22 PM   #11001
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Thanks for the info! Those holes won't line up though, will they? That has eight holes. I need one with six.
The 55 tooth one has 6 holes.
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Old 01-08-2013, 11:57 PM   #11002
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You only need two screws to hold the spur gear !
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Old 01-09-2013, 12:40 AM   #11003
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Originally Posted by bertrandsv87 View Post
You only need two screws to hold the spur gear !
As Bertrand said you only need 2 holes to mount 60t spur. I use 48p since I race mostly on prepped asphalt in the summer and the little bits of sand don't get caught up as much as in a 64p. One of the main reasons I like the AE shaft car is sealed diffs and shaft drive, not near as much maintenance as belt drive open diffs cars. Its much easier to pick out a little stone out a 48p gear with an Xacto knife.

Check out the Robinson racing site, 48p or 64p, Spurs. The outer ring of holes is for diff balls, which you dont need. If you remove the factory spur and install the 60T spur 2 or 3 of the inner circle holes should line up with the existing bolt holes. On my TC3 , 2 holes line up. By installing the 60T spur, All that needs to be removed from the chassis is the small web directly below the pinion. No grinding on the motor mount or cam is necessary. Now I'm going to see if it works on the TC4. My TC3 with the IRS graphite chassis is ready to go.I havent tried it since I installed the graphite IRS chassis. Gotta build the Tubbie TC4 as I want to try 2 cars when I go to Calgary in a couple of weeks.

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Old 01-09-2013, 01:02 AM   #11004
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You know, it never occurred to me that I could just use two screws. Hopefully, my LHS has them in stock. I prefer 48P as well for the same reasons. Durability and reliability are important to me. Anyways, hopefully I can find one here in town. Otherwise, I guess I'm ordering online! Thanks for the common sense answer!

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Old 01-09-2013, 01:10 AM   #11005
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Also, I got the TC4 going tonight since all of my motor and speed control came in. I currently have a 72T spur and 28T pinion for a 6.42 FDR. I can only drive it in my living room since there is too much snow outside. But this thing is nice and smooth! I bought it used from a guy on this forum. It seems pretty quick with the current gear ratio. I doubt it will have the same top end my TC6.1 does with the 4.05 FDR, but my son will be driving the TC4. The lack of top end might not be a bad thing for starting out, I guess.
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Old 01-09-2013, 01:28 AM   #11006
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Just curious...what's the weight of some of your guys' TC4s in race trim for 17.5T?
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Old 01-09-2013, 01:42 AM   #11007
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Just curious...what's the weight of some of your guys' TC4s in race trim for 17.5T?
Your question had me curious as well so I weighed mine on my beer hops scale. I have a Turnigy Nano-Tech 5300mah battery, Turnigy Trackstar 17.5T motor, Brushless hobbies 80A LT4 ESC, standard size Futaba metal gear servo, Futaba receiver and Xceed 26mm foam tires on it. No body. Weight is 3lb 0.75oz.

My TC6.1 with the same exact setup plus a glitch buster and low profile Savox 1251MG servo instead of Futaba, is 2lb 12.5oz.
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Old 01-09-2013, 05:29 AM   #11008
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Not a 17.5, but my vta tc4 weighs 1580 grams with no weight added.
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Old 01-09-2013, 10:05 AM   #11009
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Hello fellow tc4 owners.

I have some questions regarding the tc3 and tc4. A friend of mine gave me his old tc3 so I rebuilt it, cleaned up everything, new bearings and new electronics were dropped in. most likely this will be my vta car. So as I been looking to get some parts and spares I was looking for suggestions.

I bought a set of tc4 arms locally thinking they fit but the hinges fit loose. If I get the tc4 arms, hinges and the tc4 ft allow hinge/arm holder fit?

What are the major difference between them two and will my tc6 axles and dog bones bolt up if I want to swap to them? Was thinking about ordering a set instead of the allow ones and use regular 4mm hexes and wheel nuts.



I posted the above under tc3 as well. Thanks
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Old 01-09-2013, 07:44 PM   #11010
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Most tc3 racers on the tc3 forum will be able to assist you on the swaps, but it'll be hard to find tc4 racers that put their parts on tc3's...
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