Y2KevSE

iTrader: (13)

Would someone give detailed explanations and compare/contrast the performance on these? Answers are going to be FAQ'ed. Thanks!

Jeff92se

iTrader: (82)

Here is viscous vs torsen
http://www.miata.net/garage/vlsd.html

More info
http://www.gglotus.org/ggtech/torsen2.htm

Quaife explained:
http://www.focussport.com/quaife.htm

bill99gxe

iTrader: (1)

<flame><sarcasm>
Kev,

Why do you come into MY world and try to solicit and rip off info from MY forum?

HOW DARE YOU!

Y2KevSEbill99gxe
</flame></sarcasm>

Screaminfast

iTrader: (1)

Kev,

Let me know when you get this done. I'm right in the middle of choosing an option for better a tranmission, and better traction. I know the I30 tranny is VLSD, but i'm not sure which way I want to go.

Thanks,
Mike

Shingles

by Adrian Teo (2/25/99)
?
There are LSD's and there are LSD's.
The are primaritly a few types.

1. Helical gear type torque biasing LSD

This LSD uses the nature of worm/helical gears to transfer torque in

one direction and not in the other. This includes all the Honda and

Quaife LSD's. These LSD's are sufficient for light duty racing and

are

known to have a tendency to break, due to the nature of the design.

This usually occurs when one wheel is unloaded (like in the air) and

then loaded very suddenly.

The amount of torque bias is set by the cutting angle of the helical

gears.

2. Clutch Type/Plate Type LSD

These LSD's use friction plates which compress against each other to

lock the differential. Clutch type LSD's are VERY beefy and stand to

a

massive amount of torture. Also, these are adjustable in the sense

that they can be shimmed to give different torque bias

characteristics. These, however have to be rebuilt once the plates

lose their frictional properties.

Popular brands for this category are: KAAZ/Spoon/ATR, Cusco, Mugen.

3. Viscous type LSD's

These are similar to the viscous LSD's used in some AWD vehicles. The

way these work is that a special fluid is used in the differential

which THICKENS when excessive slip is induced. Stators and impellors

in the diff make this even more efficient. Although there is a slight

delay in locking of the differential, they work very well and last

a

long time.

Honda has optional factory viscous LSD's available in some of their

earlier cars (EF8/9).

4. Ratchet type LSD's

These are the most extreme of the LSD. These come on and off, with no

in between settings. These include the detroit locker types which are

used in RWD race cars (NASCAR) and the AP-Lockheed Suretrac ($2000+)

used on FIA homologated Touring cars.

Y2KevSE

iTrader: (13)

Cuz I want to be like Evil Bill.



Thanks Jeff.

Y2KevSE

iTrader: (13)

Bump

Y2KevSE

iTrader: (13)

Any other input?

Jeff92se

iTrader: (82)

I would but I ran out of paste.

philpoe

iTrader: (4)

Is it fair to say then that the helical diffs to be found in the Sentra SE-R Spec-V and Maxima SE-R are of the same family as Quaiffes?

Can those transmissions be retrofitted on 3rd/4th/5th gens?
I'd imagine that 5th gen wouldn't be much of a problem, and we've seen that the VLSDs from 5th gens can be used in other gens. Might be interesting to see 6spd 3rd and 4th gens.

On a different note, is there any reason that Quaiffes might cost (much) less over in England? On the Contour boards I saw people ordering from 2 places overseas and savign $$.

La Jolla Max

As far as I know, Quaife's and Torsen's are both helical.

Helical differentials are prone to break?? Huh...I thought that Quaife differentials were damn near indestructible..

Jeff92se

iTrader: (82)

If there was a swap available, using Nissan parts would be the way to do it. The big "iffy" would be if there is enough room on the tranny case to accomodate it. For the viscous units(ie.. VE 3-gen) the VE 5-sp has a "hump" in the case to house the large viscous differential parts. If the ie.. Sentra SE-R uses a gear or clutch type units(should be smaller), then the chance at a swap is much better. Probably better with a I30T tranny though. It would take some Don @Mobiletek type reasearch to find it out though.

One thing about the viscous units is that they typically only hook up to about 20-25%. Clutch and gear types can be set to much higher settings(ie.. 30-40%)

brianw

iTrader: (3)

Properly designed helical LSDs do not break-- but I think what they mean is that at high power levels they DO break.

Thanks for the info shing. I know the Quaife LSD for the Saturn uses clutch packs and wears out very quickly-- Saturn drivers regard it as a pile of crap...