Very well summarised, thank you Tony and congratulations for the Cup, great to
follow the legacy !
I do run a Gripper in my TR3, which is indeed a plate type LSD, but with the
advantage over the other Salisbury plate LSDs that the clutch discs do not have
a friction material coating.
Therefore they (almost) do not wear vs the usual coated discs, which can wear
very quickly under hard use.
Advantage over a Quaife : again, as the other plate LSDs the Gripper is fully
adjustable and does not need traction on both wheels to work, meaning it works
on snow (very useful here for Winter rallies in the Alps), slippery surfaces,
and in case of wheel lift, where the Quaife is lost, as it needs an amount of
grip both sides.
I run the car mostly in hillclimbing (and road as well, it is street legal) and
the gripper does its job very well. Some track as well, but no experience with
a welded diff to compare.
It would be interesting to see what the other Tony in the UK (Tony Sheach) who
is road rallying intensively in the UK uses and says (Here is a hint: he wrote
to the list in 2014 "Conversely, real men have rear wheel drive with plate type
limited slip diffs .... I rest my case m'lud.")
Take care dear Foters!
Alex Camoletti
(TR3A, period rally prepped, Geneva, Switzerland)
-----Message d'origine-----
De : Fot [mailto:fot-bounces@autox.team.net] De la part de Tony Drews via Fot
Envoyé : vendredi 21 juillet 2023 02:57
Ã? : fot@autox.team.net
Objet : Re: [Fot] Quaiffe Versus Gripper -
Can't keep my mouth shut on this one, lots of great advice so far.
Jack ran welded diff in TR-3 back in the day, he reported push unless he
kicked the tail out. Taught him bad habits he had to unlearn when he
went to a formula vee where smoothness rules. When he built his TR-4 he
did the Quaiffe diff so I have experience with that one.
The three main LSD's are
Gear type (Quaiffe), clutch type (Gripper / Salisbury), detroit locker,
I guess also viscous coupling but I'm going to ignore that one. This
would be like a Nissan or Subaru LSD probably.
As mentioned, the gear type diffs reward smooth driving. If you lift an
inside rear wheel, it WILL spin and you will lose some but not all of
your drive (open diff you lose all). In Jack's car, I suffered from
that but Jack didn't after learning to be smooth in the FV. Forced me
to pat attention to smoothness. Gear type diffs are pretty bullet
proof, they rely on some creative use of worm drive gears as I
understand it. If both wheels are on the ground, it will transfer
torque to both properly and not spin the inside tire. Overheating
doesn't appear an issue. There are very smooth in engagement - can't
feel it.
Clutch type have many adjustment options if you choose to use them.
They require some care in what lubrication you use since they are using
clutches in an oil bath. The clutches can wear over time so there is
some maintenance needed. They can also produce heat when being actively
used, that can be an issue in longer events. They can keep an inside
wheel from spinning when off the ground. They are progressive in takeup.
Detroit Locker is not generally available in the TR diffs, they are rare
in the big TR's, not sure if they are even available in GT-6 / spit.
They act like an open diff on corner entry so no push but act like a
welded diff on power on exit of turns. They are mechanical, reliable
and not sensitive to which lube you're using. This is the one that fits
MY driving style. You can feel them engage at times - I don't notice
while racing but do notice it in the rain or when pussy footing around.
Would be horrible on the street I'd think.
Cheers, Tony Drews
On 7/20/2023 10:44 AM, Scott Janzen via Fot wrote:
> Does anyone have experience with a Gripper diff - or a Quaiffe? I
> currently run a welded diff in the GT6 and am contemplating whether
> any advantage could be gained by making a swap. Certainly curious as
> to what the super fast GT6s at the Kastner Cup were running.
>
> Scott Janzen
> '68 GT6
>
>
>
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