[Fot] LSD diffs, what specs to choose?

[TeriAnn J. Wakeman]

On 8/24/11 4:14 PM, Alexandre Camoletti wrote:
> It will be a (very) fast road car, fully prepped for long distance road
> rallies in various conditions  (Winter, Summer, dry, wet, snow).
>
>
> I know little about LSDs, hence a couple of questions:
>
> 1)      Quaife (gear driven) or Salisbury (disc type)? I know the Quaife
> does not work with one wheel lifted, but has not the problems associated
> with disc type (oil quantity and heat)
>    
Paragraph #1 - Winter, wet, snow.

A Quaife requires rolling resistance to both wheels in order to work.  
The slipping wheel needs to provide some resistance.  A wheel in the air 
or a total lack of rolling resistance from ice can foil and otherwise 
brilliant design.  If you were like most people and keeping the TR under 
cover and hibernating during the snow I would suggest the Quaife as it 
is smooth and you never notice it is there except the rear end is not as 
squirrely.   Had one on the fornt of my Land Rover for 2 decades before 
replaing it with a Trutrac.
>
> 5)      Still Salisbury; should the RACETORATIONS finned cover be fitted to
> increase cooling and oil capacity, or is not critical in a fast road
> application?
>    
Paragraph #1 - "for l*ong distance* road rallies in various conditions"

The Salisbury type generates more heat than an open diff and I believe 
more than a Quaife would.  Over long hard driving distances that heat 
can build up and potentially cause problems.  Thanks to Greg, my TR now 
has a TRAN-X.  It also has a cast diff cover with increased oil 
capacity.  A TRAN-X is not cheap and the extra cooling capacity is good 
insurance in my book.
> 6)      There is also the PHANTOM GRIP possibility , what is it and is it
> worthwhile?
>    

There was a lot of interest in Phantom Grip a year or two back and I 
remember that a few people tried it and reported that the Phantom was 
just that.  A phantom grip.  No perceived improvement other than in the 
seller's bank balance.

Teriann

Whose TR's rear end doesn't dance like it used to when you punch it hard 
coming out of a tight curve.