Peter Fehn runs a very competitive and developed 1st gen FP car in SoloII. He just added the Guru diff recently and has told me the car is wonderful with it; he's very impressed.

 

this is a very uneasy feeling if your not expecting it too.. which is why im opting for the guru torsen.
A torsen is alot more forgiving in those times that you stop being a driver and are just a simple motorist.

 

Amen!

 

i just changed my 4.1 clutch type to the 4.3 viscous and it feels a lot softer. my clutch type was running 200500 miles when i changed it, still good. BTW i cant feel much of a difference in 1st or 2nd gear, but there is an obvious bit more "pickup" in third and fourth

Justin

 

I know someone running a Quaife diff in his Merkur XR4ti, he says he was never able to get any quicker out of a certain turn on some racetrack...anyhow, after the Quaife install he was able to exit quicker because the quaife stopped the inner tire from wanting to burn rubber, and he able to keep traction. His lateral momentum was increased as well, if he pushes a little too hard while turning his whole car would spin around and he could do doughnuts all day.

I took a ride in it the other day, and when he would take a corner, instead of a squeek, like my mazda you would here the tire skid accross the ground. It's so cool to notice a diff actually work that well! So worth $1000.

 

I agree, I think for a bang for buck go for a top quality Diff implementation early on in your modification list if you can!, With the Guru Torque Biasing Differential you can sure get on the power much earlier in the corner and maintain real control. The difference I noticed from going firstly from a standard diff to a Mazda LSD and then tot he Guru set-up was/is incredible.

 

I can't speak to the swappability... but here's what I understand to be the pros and cons of the various types:

Clutch-Type
Pros:
Quick "action", provides slip-limiting even when one wheel is off the ground.
Cons:
Wears out quickly, generally considered not to 'handle' as well as Torsen

Viscous:
Pros:
Long-lasting
Cons:
Slower 'action', generally considered not to 'handle' as well as Clutch-Type

Torsen(Torque-Sensing)
Pros:
Long-lasting-no clutches or fluid to wear out
Generally considered the best 'handling' characteristics
Nearly instant 'action'
Cons:
With one wheel lifted off the ground, the Torsen acts as an open diff.


The S2000 guys complain about this with the Torsen...if you lift the inside rear tire coming out of a corner, or hit the apexes a little to close, you get open-diff effect. You can read up on the pros and cons more at www.corner-carvers.com

(And this is a GREAT section, btw)

Armen

 

Anyone run the Guru Torsen in a N/A 86-91 rear end?

Anyone run the miata Torsen in the same?

 

A little off topic here, but I saw a 2nd Gen (S4) with a 20b in it today that was running a Guru Torque Biasing Differential (as they call it) and Guru Dogbox

The car was awsome!! both withstood 7500RPM launches, no worries!

 

Was the diff a N/A S4 type or a Turbo type? I asked but there was no centre available to suit s4 turbo at the time although there is for Miata (26 spline??) which apparently interchanges with th N?A s4 differential.