off topic / traction control

[Andy Laurence]

>I still feel that using brakes for traction control is less then ideal.
>While traction can be mantained utlizing this system, it can provide a ton
>of shock to the drivetrain.

I have to agress.  Unfortunately, you can't adjust the slip at each wheel 
without either braking a wheel or an electronic differential.  Last year (or 
maybe the year before) in either RaceTech or RaceCar Engineering was an 
article of speculation about McLaren and how they might get around their 
active wheel braking being banned.  It used two standard planetary 
differentials but operating on different ratios.  The inputs were rigidly 
connected, but the output shafts were not.  One diff had its output shafts 
directly connected to the wheels, whilst the other one had clutches 
connecting the two output shafts together.  As one wheel started to slip, 
the clutch on the other side was engaged to speed up the other wheel 
(consequently slowing the other wheel down through the planetary diff).  
Seems like a very good solution to the problem, and possibly easier to 
implement.  Any takers?

Andy
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