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Old 08-24-2008, 08:22 PM   #26731
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Originally Posted by oz_nugget View Post
hey guys a bit of a newb question , im running an Mi3 with 17.5 SP, my car is always snapping the pins in the front driveshafts/axels resulting in either a 3 wheel drive or total lockup as part of the pin jams itself in the hub, I have had to replace 4 of these in a matter of about 10 battery packs originally had the purple ones then the silver now they have snapped ....


is this a setup issue im not greasing them in any way when I put them in, unsure if there is an upgrade option or a way to fix this because it is a total pain in the butt
I had the same problem at asphalt nats (I assume you're running a spool). When I got back home I experimented on carpet a little with rubber tires. I broke down a diff and replaced the diff balls and diff rings with a piece of thick header card cut out in the shape of the diff rings. Then I was able to tighten the spool/diff down to where it wouldn't slip, but would give if I tagged a board. Be aware though that when you use the diff instead of the spool, the diff outdrives become the weak point instead of the CVD pins. If you have it tightened down too much you can twist off a half of the outdrive in a wreck. At least that happened to me the first time out. I then loosened it more, and it has held up fine and still feels like a spool. Just a thought.

If you wanna stick with the spool, be sure to use a 1.5 or 2 mm shim between the steering block and the c-hub to limit the throw. Also be sure to set your EPA's accordingly. And the anti-wear isn't a bad idea either (Who am I to argue with a NATIONAL CHAMPION! LoL)
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Old 08-24-2008, 08:47 PM   #26732
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hey andrew, whats up buddy,
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Old 08-24-2008, 08:50 PM   #26733
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Not a whole lot . . .getting back to school, rooting for my Buds in Vegas. I've been playing in the dirt a little. I am really looking forward to the CAT SX . . .I'm running 12th some too. Waiting for winter so I don't need to change shirts 3 times a race day from the heat. You?
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Old 08-24-2008, 09:05 PM   #26734
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I had the same problem at asphalt nats (I assume you're running a spool). When I got back home I experimented on carpet a little with rubber tires. I broke down a diff and replaced the diff balls and diff rings with a piece of thick header card cut out in the shape of the diff rings. Then I was able to tighten the spool/diff down to where it wouldn't slip, but would give if I tagged a board. Be aware though that when you use the diff instead of the spool, the diff outdrives become the weak point instead of the CVD pins. If you have it tightened down too much you can twist off a half of the outdrive in a wreck. At least that happened to me the first time out. I then loosened it more, and it has held up fine and still feels like a spool.

Got any pics of this and how you have done it ??? sounds interesting

also regarding lowering the EPA, I have not done this and at near full lock the car makes a terrible noise from the front when accelerating kinda shuddering clashing noise ( this is only on a stand cannot tell if it does it on the ground )

So should i turn down the EPA till this stops? I think that it only gives me around 40% steering angle
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Last edited by oz_nugget; 08-24-2008 at 09:21 PM.
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Old 08-24-2008, 10:44 PM   #26735
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You should set your EPA so that with the spacers CA'd to the steering block to limit travel, the servo stops moving as the steering blcok hits the c-hub. You may still wind up with some chatter. Another litmus test to ensure you aren't receiving too much throw is to make sure your cirlces are approx. 5' or larger. Sometimes a poorly balanced tire will exacerbate the chatter problem as well as worn bearings and a bent CVD.

I don't have any pics, but the spool/diff is as simple as
1.removing the diff rings
2.tracing them onto thick header card
3.using an exacto to cut them out
4.test fitting them onto the diff halves
5.reassembling the diff minus the rings and diff balls after cleaning everything.

Be sure to leave the thrust bearing in.

Once installed you should be able to hold one front wheel and turn the other. You'll have to play with the tension to suit your liking.
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Old 08-24-2008, 11:16 PM   #26736
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been looking at this exploded view

http://www.racing-cars.com/images/Te...3_exploded.pdf

Sorry for being such a newbie at this but I dont understand where to glue the spacer, no one else at my club has this problem so arnt much help ..

what part actually is the steering block ... is this the piece that bolts to the hub and what it pivots off ? if so where exactly do you glue the spacer .. lol I doubt you have any pics

thanks alot for your help .. glad there is people like you around
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Old 08-24-2008, 11:57 PM   #26737
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Old 08-25-2008, 04:30 PM   #26738
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Originally Posted by andrewdoherty View Post
Not a whole lot . . .getting back to school, rooting for my Buds in Vegas. I've been playing in the dirt a little. I am really looking forward to the CAT SX . . .I'm running 12th some too. Waiting for winter so I don't need to change shirts 3 times a race day from the heat. You?

i don't change shirts from the heat but they are getting soaked from the rain, parked the Mi's and doing off road waiting for the cat (here kitty kitty, anyone seen my kitty)(adam), i was hoping to go to vegas to watch, but not going to happen.

prob see you next year at Nats again. this time i'll make sure you get the right menu
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Old 08-25-2008, 05:15 PM   #26739
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lol. Ill be sure I check my shocks and not convince myself to "just drive it". Im jones-n for some more cracker barrell. MMMmmmm
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Old 08-25-2008, 07:47 PM   #26740
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Originally Posted by andrewdoherty View Post
1.removing the diff rings
2.tracing them onto thick header card
3.using an exacto to cut them out
4.test fitting them onto the diff halves
5.reassembling the diff minus the rings and diff balls after cleaning everything.

Be sure to leave the thrust bearing in.
I always found it easier to glue the ring to the header card first then trim the ring out from the card
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Old 08-25-2008, 08:05 PM   #26741
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I always found it easier to glue the ring to the header card first then trim the ring out from the card
Do you install the header card with the rigs still glued to them? Or are you able to take the headercard off without ripping it???

Thanks for the idea either way pdub. : ) You in Vegas?
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Old 08-26-2008, 10:07 AM   #26742
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Do you install the header card with the rigs still glued to them? Or are you able to take the headercard off without ripping it???

Thanks for the idea either way pdub. : ) You in Vegas?
Yep; header card facing the diff gear. The only thing I removed was the diff balls and kept everything else the same.

Unfortunately no Vegas for me; the new job requires most of my racing to be off-road. I do sneek in some local on-road events though
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Old 08-26-2008, 02:39 PM   #26743
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good luck to all you in vegas.
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Old 08-31-2008, 10:28 PM   #26744
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good luck to all you in vegas.
Looking for the setup(s) for rubber tires from the guys at vegas.
Just trying to see what was different from driver to pilot...
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Old 09-01-2008, 10:20 AM   #26745
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I just wake up from getting back from Vegas (13hours of sleep baby - YES - that "Y" "E" "S" as Adam would say)!!! I'll work on getting a setup out there this week. I finished 7th in the B-main with it - not an A-main finish but still I'm pretty happy with it.
I know Vegas just finished up but what's the next race you guys are looking at attending. I had the pleasure of meeting JayBee - he is just as awesome in person as he is on here. I got to see some old friends like Adam Bailey (Co-Captain, Co-team Manager, Mr. Amateur Racer), Dave Bertetto and Dave Duncan - always go to see you guys. I got to meet Wes "The Kid" Lion and his fetish for girlie cards - hehe!! And of course my buddy Yang - the Yangest!!! I had a great week racing with you guys and look forward to the next time the team can get together and do some racing.

L8R MArker
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