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Old 11-09-2010, 09:44 AM   #9541
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As far as cheap lipos, i say again...get a 3800 35c venom "roar" approved for under $60 they are good packs.
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Old 11-09-2010, 02:01 PM   #9542
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Default tc3 spur/pinion combo

I just started running vta a couple weeks ago with a used tc3 setup. The guys in my class say that a 4.80 fdr is perfect for our track. What's my best option for 48p pinion & spur combo that doesn't require any chassis grinding or cam grinding? Thanks for the help in advance!
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Old 11-09-2010, 02:17 PM   #9543
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48 pitch: 72/37=4.86, 69/36=4.79.

Click here for a gear chart to help you

Gear ratio charts

Gear ratio conversions
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Old 11-09-2010, 02:46 PM   #9544
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As far as cheap lipos, i say again...get a 3800 35c venom "roar" approved for under $60 they are good packs.
How are the 5000 40c venom packs they any good?
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Old 11-09-2010, 03:02 PM   #9545
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How are the 5000 40c venom packs they any good?
Yes, they're really good, but way overkill for VTA. The 3800s are more than sufficient, and way cheaper.
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Old 11-09-2010, 03:40 PM   #9546
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Thanks for the quick reply Buckaroo but I don't think it completely answered my question. Based on the information that I've read on the tc3, the 36 & 37 pinion will both require chassis mods to fit. Do you happen to know the largest pinion that I can run without mods? Will 66/34 work without mods?
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Old 11-09-2010, 03:49 PM   #9547
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Originally Posted by nitro_mt_racer View Post
Thanks for the quick reply Buckaroo but I don't think it completely answered my question. Based on the information that I've read on the tc3, the 36 & 37 pinion will both require chassis mods to fit. Do you happen to know the largest pinion that I can run without mods? Will 66/34 work without mods?
Because the diameter of the gears really doesn't change with respect to pitch, you will have to grind out the webbing under the pinion gear on the TC3 to arrive at you desired ratio. I know you may not like it, but I have 3 of them and its the only way to get to that ratio.
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Old 11-09-2010, 03:56 PM   #9548
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Because the diameter of the gears really doesn't change with respect to pitch, you will have to grind out the webbing under the pinion gear on the TC3 to arrive at you desired ratio. I know you may not like it, but I have 3 of them and its the only way to get to that ratio.
Yup, regardless of pitch, you're going to be in the same pickle. Some folks switch over to 64 pitch to get finer adjustments between gears to fine tune, but that doesn't solve the space problem, as the TC3 was designed and sold when the first of the brushless systems were being sold, well before their relatively refined state of today. Brushless tolerate a range of gearing that would toast even the most resilient of brushed motors .

As to the 66/34, I don't know, never tried a spur that small in the TC3!

Only the dremel solves the clearance issue! Luckily, not much really needs to be removed. Work slowly, and be sure to take just a LITTLE extra to compensate for a little flex in the chassis.
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Old 11-09-2010, 04:23 PM   #9549
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Thanks for the responses guys! The guy that I bought it from included some 64p stuff but no combination gets me any closer to 4.80 than the 48p parts. Guess I'll head to the lhs and pick up a selection of pinions & spurs and then break out the dremel to get them to fit.
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Old 11-09-2010, 05:20 PM   #9550
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Robinson makes pinions in 70, 66, 60, 55, 52, and even 49T. One of these should get you to 4.8 FDR. To get an approx. 4.2FDR (for 21.5 motors) I usually use 60/35. 60/31 * 2.5 = 4.83 FDR.
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Old 11-09-2010, 05:25 PM   #9551
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Quote:
Originally Posted by nitro_mt_racer View Post
I just started running vta a couple weeks ago with a used tc3 setup. The guys in my class say that a 4.80 fdr is perfect for our track. What's my best option for 48p pinion & spur combo that doesn't require any chassis grinding or cam grinding? Thanks for the help in advance!
In case you decide to tackle the mod I dug this up for you. It's really pretty easy.
http://www.rctech.net/forum/5357881-post207.html
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Old 11-09-2010, 05:52 PM   #9552
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In case you decide to tackle the mod I dug this up for you. It's really pretty easy.
http://www.rctech.net/forum/5357881-post207.html
Thx Evoracer!
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Old 11-09-2010, 06:04 PM   #9553
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Be sure to take a little off that chassis brace as well. Some of the larger pinions will hit it.
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Old 11-10-2010, 08:32 AM   #9554
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Originally Posted by smokefan View Post
How are the 5000 40c venom packs they any good?
I haven't tried them. I do have a friend who has a 5000 30c and it is very good. But no where near as inexpensive as the 3800 which is more than enough battery.
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Old 11-10-2010, 09:33 AM   #9555
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How are the 5000 40c venom packs they any good?
That is what is in my son's VTA car, which he also is able to swap back and forth with his TC and SCT.
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