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Old 08-29-2010, 12:34 PM
  #13066  
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I don't fill the diff housing with AW grease. Just a little on the gears and a little on the shims. No leaks. No mess. Just a very smooth yet limited slip diff.
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Old 08-29-2010, 02:28 PM
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I don't understand how everyone thinks putting a little grease on the gears and shims constitutes a limited slip The gear diff is sooo loose it slips constantly under any on power turning/rotation no matter what you do. I can hear it from 100 ft away and feel it too. In order to slow the thing down you need to pack it tight with grease and thats just so messy and does not last due to shearing. I don't know maybe I'm missing something here Don't get me wrong the gear diff works but, for racing I prefer a diff. Someone needs to make a gear/ball diff build video.
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Old 08-30-2010, 08:05 AM
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If you add more shims behind the outdrive gears it adds pressure to the planetary gears and make it a lot harder to get any diff action. You can almost get so tight it acts like a spool.
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Old 08-30-2010, 08:09 AM
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Originally Posted by runar80 View Post
I`ve tested the Spice slicks on carpet and they work really really good. The problem is that they`re twice as much as most others.

Does anyone know something else on RCmart that works just as good?

Thanks
Try these. I used these for a full indoor season on my car and they hook up great and have no real signs of tire wear.

http://www.rcmart.com/catalog/rc-min...5-p-19957.html
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Old 08-30-2010, 09:02 AM
  #13070  
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Originally Posted by gashuffer View Post
I just run at the track, nobody else has a mini. I would race it if they're was a class
The Track at Winthrop Harbor ? If so the Mini class should pick up once the
racing moves back indoors last winter season we had easily 10 minis per Sunday.

Last edited by IL_AudiRacer; 08-30-2010 at 09:25 AM.
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Old 08-30-2010, 03:35 PM
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Where is Wintrop Harbor? Il? I think you got me confued with someone else
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Old 08-30-2010, 04:17 PM
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Originally Posted by gashuffer View Post
Where is Wintrop Harbor? Il? I think you got me confued with someone else

http://www.harbor-hobby.net/
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Old 08-30-2010, 04:39 PM
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Winthrop Harbor is a little north and east of Gurnee Mills and Six Flags.
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Old 08-30-2010, 04:51 PM
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Originally Posted by sidecarphil1 View Post
I found with the gear diff if i added spacers it wore the teath off the innergears and no matter what oil / grease i added it just poured out after one race , i even tried the really thick grease for the 5th wheel on a Articulated lorry but that made a real mess . . . . . . . .
Yeah thats probably because the gears have very poor tollerances and do not mesh well. Putting excessive pressure on them is probably just going to exacerbate that.
And as little chunks fly off the gears it probably clumps all over the place in the teeth and just makes everything worse.



Also technically speaking i always thought slip in a diff was when the wheels turn independantly of the diff action (ie in a diff both wheels should spin at the same speed in same direction or the same speed in opposite directions), which would be impossible for a gear diff? Or do i misunderstand the terminology?


Yeah and if you pack the gears with grease you have to seal around the diff so it doesnt all fly out.
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Old 08-30-2010, 05:25 PM
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The reasoning behind packing the gear diff is to slow the rotation enough so that the wheels drag to try to keep traction between both. It only really slows the gear down with the feel of ball diff action.

With a ball diff when the car loads up to one side the opposite wheel will turn slower to maintain power/traction
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Old 08-30-2010, 05:27 PM
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Il Audi I live in Florida and New Jersey, but if I was in Il. I would definitly go to Winthrop
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Old 08-30-2010, 06:04 PM
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Originally Posted by mangoman View Post
Yeah thats probably because the gears have very poor tollerances and do not mesh well. Putting excessive pressure on them is probably just going to exacerbate that.
And as little chunks fly off the gears it probably clumps all over the place in the teeth and just makes everything worse.



Also technically speaking i always thought slip in a diff was when the wheels turn independantly of the diff action (ie in a diff both wheels should spin at the same speed in same direction or the same speed in opposite directions), which would be impossible for a gear diff? Or do i misunderstand the terminology?


Yeah and if you pack the gears with grease you have to seal around the diff so it doesnt all fly out.
I used the term "limited slip" because it kind of describes of how the diff works as I have it assembled. In a real car, a limited slip rear end only allows one wheel to spin a small amount before it engages the other tire and acts like a locked diff. The problem we have with the fwd cars is that when trying to accelerate out of a turn, the inside tire has very little weight on it so it will start spinning. We try to make our diffs work like a real limited slip diff to keep that from happening. When I talk about limited slip, I'm not talking about slip in the diff. I'm talking about spin on the tires. Adding shims and thick grease like AW grease stiffens up the diff action which makes the wheels want to spin at the same speed. Hope that makes sense.
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Old 08-30-2010, 06:43 PM
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It does, and you are absolutely correct.
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Old 08-30-2010, 07:11 PM
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+1
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Old 08-31-2010, 12:51 PM
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http://www.rctech.net/forum/r-c-item...ml#post7879917
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