Limited Slip Differential (Winter project)

V8 burble · Post by **V8 burble** » Wed Nov 18, 2009 8:54 pm

Twiddling your thumbs?
Need a winter project?
How about fitting a LSD in your Salisbury 4HA axle?

In my opinion a limited slip differential should have been fitted at the factory to every new Tiger as standard. Obviously cost considerations ruled out this important safety item.
There are basically three different types of LSD:
1)clutch plate (Thornton Powr-Lok)
2)geared or torque-biasing (Quaife, Torson-Gleason)
3)viscous.
I advise using the Quaife ATB Helical gear type, not the clutch type (Powr-Lok) which is generally fitted to the Tiger.
The Quaife LSD is far smoother in engagement than the Powr-Lok, which tends to snatch. This snatching can further aggravate an already potentially hazardous situation.
For further information on the Quaife LSD visit:
www.quaife.co.uk

Revised link for QDF1W lsd:

http://www.quaife.co.uk/shop/search/res ... C214%2C215

Quaife Engineering: Telephone 01732 741144

You will need a specialist company to install the Quaife LSD and I can recommend Competition Transmission Services (The Gearbox Man) who has a “supply and fit” service:
http://www.gearboxman.co.uk/

Telephone: 01582 840008 (Speak to Bernie, the owner)

The axle should be supplied bare without the half-shafts. Additional labour costs will be charged to remove the hubs and half-shafts.
Current pricing (excluding vat) on the LSD is £775. The fitting charge is £180 plus the price of replacement parts as required. A new pinion bearing and oil seal will be routinely fitted along with any other bearings, spacers etc.
I would estimate the total cost to be about £1200 (including vat).
Note that the Quaife LSD uses standard EP90 oil such as Comma's EP90W GL-5:
http://www.commaoil.com/productsguide/view/6/186

In contrast, the Powr-Lok requires special oil, such as Morris Lubricants' XEP90, which contains a friction modifier.
http://www.morrislubricantsonline.co.uk ... product=35

Whilst the axle is off the car it may be a good idea to replace the propshaft universal joints if you are unsure about their condition.
To make the difficult job of rear hub removal somewhat easier, I suggest you have a special puller made as per this article by Dan Walters:

http://www.tigersunited.com/techtips/Wa ... uller1.asp

Before using the puller, make sure that the hub nut is reversed on the shaft (castellations facing inwards) and is flush with end of the shaft. A sturdy piece of wood may be placed between the nut and the underside of the top half of the puller. This, hopefully, will lessen the chances of doing serious damage to the thread on the shaft.

Tomaselli · Post by **Tomaselli** » Wed Nov 18, 2009 9:58 pm

Brilliant article V8 Burble, perhaps this could be reprinted with your permission as an article for the club magazine, Cats Whiskers (for the benefit of our non www members)

I must admit, I have no technical knowledge of the LSD units that can be fitted to the Tiger, or indeed which one I have but I will agree with you they should be standard as they make a huge difference. Both from getting the power down in a straight line from a standing start and also from keeping the rear end in check when cornering hard.

I wonder what setup the racing boys use on the circuits.

Would be good to hear what Tiger owners are running/have used and your article has educated me to find out what system I am running, even so am very pleased with the results and would encourage owners even just for the safety argument (better roadholding/accelerate out of trouble) to consider installing a system.

Only thing I would also consider, if one is thinking of drag-strip type standing starts, then anti-tramp bars are a must.

Thanks again.....

V8 burble · Post by **V8 burble** » Wed Nov 18, 2009 10:10 pm

Thanks Tomaselli.
Feel free to reprint the article in CW.

V8 burble · Post by **V8 burble** » Tue Mar 22, 2011 10:34 am

Just adding an update from the “Transmission Oils-Warning” thread.
The Thornton Powr Lok LSD requires a special EP90 oil containing a friction modifier.
This one from Morris Lubricants (XEP90) appears to be generally available and at a reasonable price.

http://www.morrislubricantsonline.co.uk ... product=35

NB The Quaife LSD uses standard EP90 without the friction modifier.

michael-king · Post by **michael-king** » Tue Mar 22, 2011 11:12 am

Tomaselli wrote: they should be standard as they make a huge difference. Both from getting the power down in a straight line from a standing start and also from keeping the rear end in check when cornering hard.

I wonder what setup the racing boys use on the circuits.

Would be good to hear what Tiger owners are running/have used and your article has educated me to find out what system I am running, even so am very pleased with the results and would encourage owners even just for the safety argument (better roadholding/accelerate out of trouble) to consider installing a system.

Only thing I would also consider, if one is thinking of drag-strip type standing starts, then anti-tramp bars are a must.

Thanks again.....

Tony,

Different types of LSD's work in different ways.. and clutch pack setups like the posi's can have hard or soft clutch packs which contorls how aggresively thre LSD comes into play.. I have found the LSd in the Tiger great in the dry.. but in the wet it makes the car a handful.. when the diff locks up it can snatch the back quite quickly... on slipery winding wet roads can be a handful.

Tomaselli · Post by **Tomaselli** » Tue Mar 22, 2011 11:47 am

michael-king wrote:on slipery winding wet roads can be a handful.

Nothing wrong with that!.........

michael-king · Post by **michael-king** » Tue Mar 22, 2011 12:08 pm

Tomaselli wrote:
michael-king wrote:on slipery winding wet roads can be a handful.
Nothing wrong with that!.........

Is that why you have 2 MKII's?

Tomaselli · Post by **Tomaselli** » Tue Mar 22, 2011 9:50 pm

Only have the one Tiger with a LSD, and to be honest it does make a HUGE difference - they should have been fitted as standard at Jensen, but I suspect it was all down to costs at Rootes.

Tigers without LSD and all that torque are indeed lethal

Mal · Post by **Mal** » Wed Mar 23, 2011 6:00 am

Tigers without LSD and all that torque are indeed lethal

Why's that

. Usually if you don't have a LSD, you will lose traction on just one wheel and thats about all that hapens. With a LSD if you lose traction you will spin both rear wheels. Thats when the rear tries to overtake the front.

bigbob · Post by **bigbob** » Wed Mar 23, 2011 11:05 am

I have salisbury LSD in mine, which I think is set up too harsh. I too find that whilst traction off the line is great, the rear end snaps round far too quick, or maybe I'm a crap driver & cant hold a drift.

gtsmrt · Post by **gtsmrt** » Thu Mar 24, 2011 7:10 am

bigbob wrote:I have salisbury LSD in mine, which I think is set up too harsh. I too find that whilst traction off the line is great, the rear end snaps round far too quick, or maybe I'm a crap driver & cant hold a drift.

It's not that your crap, you just need more practice... As they say, practice makes perfect

gtsmrt · Post by **gtsmrt** » Thu Mar 24, 2011 7:27 am

Hi V8 burble,

Quaife don't actually list an LSD for the Tiger, but do you know what they use or do they custom build one?

Thanks, Robin.

V8 burble · Post by **V8 burble** » Thu Mar 24, 2011 1:49 pm

Robin,

Quaife's website has been changed with the result that the link (just revised) in my original post no longer works.
Quaife definitely does do a LSD (part number QDF1W) for the Tiger/Jaguar 4HA axle and here is the new link:

http://www.quaife.co.uk/shop/search/res ... C214%2C215

sbt302 · Post by **sbt302** » Thu Mar 24, 2011 10:37 pm

Hi all,

I have a quaife diff in my car..it's a helical torque bias differential..a good buy I reckon.

gtsmrt · Post by **gtsmrt** » Fri Mar 25, 2011 12:56 pm

V8 burble wrote:Robin,

Quaife's website has been changed with the result that the link (just revised) in my original post no longer works.
Quaife definitely does do a LSD (part number QDF1W) for the Tiger/Jaguar 4HA axle and here is the new link:

http://www.quaife.co.uk/shop/search/res ... C214%2C215

Hi,

Thank you for the link and the part number.

Regards, Robin.