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Many years ago, when slot racing was in an earlier state of development, there were lots of experiments with differentials.

Compared with a solid axle there are some obvious features of differentials like extra cost, extra weight, robustness issues and something else to go wrong. Some would have accepted all that and use differentials if they made the car go better. In general they didn't make the car go better, so slot cars with differentials became very rare.
 

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QUOTE (RichD @ 22 Dec 2011, 15:55) <{POST_SNAPBACK}>A lot of 1:1 racing cars use a locked differential, so there must be an advantage to that arrangement.
Yep, if you're a Jeep or a drifter. Limited slip differentials are most popular amongst tarmac/rally racers. They permit enough slip for the wheels to turn at different speeds around the corner radius they're following without allowing all of the torque to leak out through the least loaded wheel.

I often mull over the possibilities of an LSD in a slot car, but figured that the weight penalty alone would offset any potential handling gains.
 

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I don't think the wheels are really far enough apart for a diff to be necessary on a slot car, my father and myself used to race a Mk1 Escort on dirt with a locked diff, lap times were better with the locked diff but it was harder work to drive, you had to make it slide to make it steer.
 

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QUOTE (stoooo @ 22 Dec 2011, 16:12) <{POST_SNAPBACK}>Using the steering wheel as an oversteer modulation device


It's hard to describe how to do it, it's also over twenty years ago, but you initiated the turn with the steering wheel, booted the throttle (it had a 2 litre Fiat twin cam with about 180bhp) and then sort of balanced the sliding and turning with the throttle and steering wheel, then when it was pointing vaguely in the right direction for the next straight, straightened the steering up and booted it again.
The diff eventually went bang in a fairly comprehensive manner on a particularly hard packed dry track and we decided to go back to a conventional diff from an 1100 Escort van (for the low gearing).
 

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Yeh LSDs are they way to go in much full size racing and rallying these days. The limited slip diffs used at the top end are pretty high tech and depend on a detailed understanding of what the tyres are doing. There just isn't that level of understanding about what slot car tyres are doing. So even if there was a practical way of building a high tech LSD for a slot car, working out what characteristics to build into it would be a whole new ball game. That's now of course, who knows what will get developed in the future?
 

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QUOTE (stoner @ 22 Dec 2011, 09:45) <{POST_SNAPBACK}>i searched the forum but couldn,t find any thing. has any one tried the ball diff from a mini Z in a slot car and your opinions. john.
Hi John
I've been having similar thoughts.
I think ball diffs haven't been tried only Vanquish.
Let us know how you get on.
Andi
 

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Discussion Starter · #11 ·
hy! conti, i,ve got 2 vanquish cars. the lightweight racer has a solid rear axle because the diff broke, i fixed the other one before it broke by glueing the two parts of said diff together useing 2 part polyester resin. they break becaus the anchor points arn,t strong enough! allowing the diff to flex and come apart slightly and strip the gears. the kyoho gear looks light and simple, i will get round to using one but it wont be untill jan or feb, i just thought someone must have tried it being the curious lot that we are. by the way it will only go in s/w or a/w configureation. i,m slightly diapointed, still merry christmass to every one on this forum. john.
 
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