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Old 08-30-2010, 09:50 PM   #11446
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Default Tc3 brace take off.

Any one know , is it safe to take off the (rear-right) brace during races?
I was Planning for easier pinion change.
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Old 08-30-2010, 10:07 PM   #11447
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Attached are some photos. Depending on how far you want to go, you are not done with the motor mount alone. The chassis may need milling (or Dremeling) in several areas. The chassis reinforcement below the pinion in particluar. You may also need to remove some of the outer reinforcing wall next to the motor as well as the rear wall to allow space for the sensor wire. And in some cases, you may need to modify the right rear chassis brace. Check the pictures, they're worth a thousand word explanation. With all these mods combined, I can get a 62 tooth pinion in with an 84 tooth spur (64 pitch) for a final drive ratio of 3.39. That gear ratio isn't of much use though on anything but an oval layout, so you probably don't have to go as far as I did. It was a trial and error learning process for me.
Attached Thumbnails
TC3 Forum-tc3-motor-mount-mods-002-large-.jpg   TC3 Forum-tc3-motor-mount-mods-003-large-.jpg   TC3 Forum-tc3-motor-mount-mods-004-large-.jpg   TC3 Forum-tc3-motor-mount-mods-006-large-.jpg   TC3 Forum-tc3-motor-mount-mods-009-large-.jpg  

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Old 08-30-2010, 10:10 PM   #11448
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Any one know , is it safe to take off the (rear-right) brace during races?
I was Planning for easier pinion change.
You will get more flex around the motor mount which could affect your gear mesh. However, I've never had any problem running the modified brace pictured in the previous post. But I didn't do it for the purpose of easing pinion removal and I've never really tried to get the pinion out without removing the motor first.
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Old 08-30-2010, 10:55 PM   #11449
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You will get more flex around the motor mount which could affect your gear mesh. However, I've never had any problem running the modified brace pictured in the previous post. But I didn't do it for the purpose of easing pinion removal and I've never really tried to get the pinion out without removing the motor first.
great advice, will try to mod that brace, if could be wear to be easier pinion changing, as i will loosening the motor cam mounting, hope this is the solution, by keeping the chassis rigidity.
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Old 08-31-2010, 10:02 AM   #11450
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Good lookin work Beemer!

--------------------------------------------------------------------------------------------

Spur/pinion mesh flex is a potential issue for a composite tub if youre racing on HOT asphalt. Pick your tub up and give her a twist after a 6 minute run on some 130+ degree asphalt.

If youre racing on rubber tires, torsional flex consistency is more important than overall chassis rigidity. As long as you dont strip gears, then have at it.
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Old 09-01-2010, 07:29 AM   #11451
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When I started milling out parts of my chassis around the motor mount I was a bit concerned about unwanted flex or tweak. But I'm on my third chassis with the similar mods and I've been racing with all of them. So far I haven't had any problems on the hot summer asphalt. However, these are the molded graphite tubs, not the plastic ones and I only race stock or spec classes. I've also milled the center ribs down and then reinforced them with a piece of 1/16 model aircraft plywood and epoxy allowing the battery to sit closer to the shaft. This mod helps balance but I also think the wood and glue add to the chassis rigidity. The cars have been excellent performers in VTA.
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Old 09-01-2010, 09:05 PM   #11452
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Thumbs up Re...TC3 gearing for VTA

All you have to do is get a robinson 68 tooth 1/12 scale spur and replace the the associated spur and it brings the gearing back in line. I think I'm geared 68 to 33 or 34 for an 80 X130 asphalt track with a 21.5 Ballistic motor. Got this tip from a friend of mine, works good!!!!

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Old 09-02-2010, 03:35 AM   #11453
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All you have to do is get a robinson 68 tooth 1/12 scale spur and replace the the associated spur and it brings the gearing back in line. I think I'm geared 68 to 33 or 34 for an 80 X130 asphalt track with a 21.5 Ballistic motor. Got this tip from a friend of mine, works good!!!!

TJ
thats good info thanks to every body ,now with the new rules (25.5) does any body know the new pinion /spur combo?
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Old 09-05-2010, 02:28 PM   #11454
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Quote:
Originally Posted by beemerfan View Post
Attached are some photos. Depending on how far you want to go, you are not done with the motor mount alone. The chassis may need milling (or Dremeling) in several areas. The chassis reinforcement below the pinion in particluar. You may also need to remove some of the outer reinforcing wall next to the motor as well as the rear wall to allow space for the sensor wire. And in some cases, you may need to modify the right rear chassis brace. Check the pictures, they're worth a thousand word explanation. With all these mods combined, I can get a 62 tooth pinion in with an 84 tooth spur (64 pitch) for a final drive ratio of 3.39. That gear ratio isn't of much use though on anything but an oval layout, so you probably don't have to go as far as I did. It was a trial and error learning process for me.
Hey "beemerfan" what ball caps are those your using?
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Old 09-05-2010, 02:52 PM   #11455
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Theyre Schumacher ballgrippas...
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Old 09-05-2010, 04:47 PM   #11456
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Theyre Schumacher ballgrippas...
Whats the part #? Theres a bunch of different ones and sizes?
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Old 09-05-2010, 06:11 PM   #11457
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Whats the part #? Theres a bunch of different ones and sizes?
I honestly don't know anything about them except that they are Schumachers. The car in the photo was an eBay special that came with those ball links already installed. I do like them though. They stay on much firmer and operate much smoother than anything associated has ever made.
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Old 10-28-2010, 11:04 AM   #11458
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Put this page up front
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Old 10-28-2010, 11:15 AM   #11459
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I am hoping someone can point me in the right direction. I am looking for the thread about modifying the motor cam in order to run larger pinions. Thanks in advance..
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Old 10-28-2010, 11:39 AM   #11460
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Did you catch the photos at the top of this page in post 11447?
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