Of course but the issue raised was does a Quaife work and that's known to be yes.

Very possibly Tom is willing to sell on his experience but I would guess "sell" is the operative word as he makes a living from this kind of thing.

I wouldn't argue but all along seems everyone wants a very cheap LSD and all along it really looks like no such thing exists. A real expert (TL Jaguar) chose the Quaife for good reasons. Doesn't prove there's no cheap alternative but tends to point towards that, especially as people have been on the hunt for years now.

 

I've just ordered a Quaife from Tom at TL Jaguar, we've had quite some discussion about the install because my local guy will do it.

Tom says that for my 2004 built XJR, the Quaife is a simple direct bolt-in, no machining needed. However later models, lets say 2007 onwards have a slightly different housing, and that is where the modification is needed. Also, if your car had the diff replaced under warranty after around 2007 then the same applies.

Should be the same for S-Types, i guess.

Will be a few weeks until i can give feedback about the install process.

Also, Tom will sell you a complete diff with the LSD fitted, but it ain't cheap because he has to buy a complete unit in the UK, which adds to the cost. He wasn't interested in getting my unit in exchange because of shipping costs.

 

I think you've misunderstood me.

Yes we know that Quaife is a legitimate differential. They made a unit for Maserati called the "Ranger" back in the late 80's to mid 90's. It replaced a Torsen unit they were using before that. I have one of the Torsen units and it's not all that effective. The Quaife was eventual replaced by Ferrari with a more garden variety ZF LSD unit with the plates. I have one of those in my track car and it does the job very, very well. I have not tried out a Quaife differential though.

These differentials can perform somewhat differently from each other also depending on how they're set up. So that's one of the issues. Then there's the issue of how people like it in the S-Type along with the cars electronics being engaged.

That, I am interesting in hearing about from someone who owns one but does not have an axe to grind.

 

I wasn't going to post more about my upgrade project, but my machined housings arrived back, so I am kitting the parts to have one assembled. I will have close to $1700 in parts and labor for this Mark VIII build: Torsen T-2R 31 spline LSD, New 3:55 gear and pinion set, Bearing Rebuild kit, seals, outer bearings, Bearing girdle stud kit, the 2000 S-type Core to get a donor cover, new pinion flange, oil, and Silicone sealant. A pair of new grade 10.9 metric bolts to hold the cover to the sub-frame cost me close to $20.00 (It add up so fast these days) Please remember that I am building a rear suspension sub-frame assembly that will handle 600+HP. What I am doing is not your standard addition of LSD.
- I am sure my custom built half-shafts/axles will cost close to $1500.
- Purchasing a used pair of upper and lower Control arms and pressing in new bushings will run close to $1K.
- New sway bar links and tie rod links, new outer hubs, hub carrier bearings. $$

It adds up way over $4K really fast. Plus I am doing 90% plus of the labor.

 

I've had my STR for about 6 months now and I really don't like how the traction control works! It is way to limiting in my opinion for a performance sedan.
I've experienced numerous times now where I am under full acceleration and when a tire breaks free, the crappy traction control over reacts and restricts the throttle, and or breaks the slipping tire. This makes for a very rough attempt to accelerate. I'll take a car with a good LSD any time over Traction control in the STR. I prefer to feather the throttle myself rather than have the car do it for me!

Personally I prefer a Torsen over a True-trac for Auto-crossing, track racing, or performance street work. (I don't have interest in drag racing.) The Torsen T-2R has the best torque bias ratio of the mass produced LSDs. As far as performance goes, I believe the Quaife and the Torson T2 have about the same performance characteristics. I have never ran a Quaife but I believe them to be an excellent LSD.

 

Wow Joe. Yer project going to be something. Can you tell us what exactly it is?

 

https://www.jaguarforums.com/forum/s...-engine-33719/

This was the original post when I started this project several years ago. I worked away from home for more than a year, and only started working on the car again several months ago.

In a nut shell, I put a 2010 LS3 with TR6060 6 speed manual into a 2000 S-type.
Most of the drivetrain mechanical is complete, but I am only about 1/3 of the way through rewiring the car to work like a 2009 Pontialc G8. (I dislike doing electrical wiring, but that's primarily what needs to be finished to get the car running.) I prefer mechanical projects over electrical, so that is probably why I took on a rear-end upgrade before finishing the electrical.

 

Wow, I remember reading about your project way back. IMO, u got determination, patience, and *****. Lol. When I was 18 I completely converted a 6 banger 1965 mustang into a 289 v8 with four speed and v8 rear end. You got an entirely different animal in the making. Props to you bro.

 

Today: Spoke with Eric (DTS). He's putting together a quote for Quaife LSD install. If we send our differential with Quaife, he'll install it with new carrier bearings ($40) for $150 labor. He's also putting together a package deal where he supplies the Quaife and bearings. He reiterated the issue with our test mule diff.: they could have put a Traction- Lok in but it would have necessitated custom axles with an S-Type at their disposal to properly mock-up.

 

Good stuff, let us know what DTS says regarding a complete price installed on a quaife,

 

How does STR do burnouts with 2 wheels if it has a LSD?

See this video:

 

This is how I do it

 

If there is a slick surface or loose stone, the differential will transfer some power to the open axle. I've had similar experiences.

 

Well my XJR is in the workshop as we speak, in addition to the transmission fluid/pan change, fitting a 3lb pulley, Bosch 010 intercooler pump and a full service, they are also fitting a Quaife QDF3W...



Unfortunately the 3.58:1 ring & pinion is still sitting here under my desk, damn the lack of TCM reprogramming...

I left a camera with the mechanic & asked him to take a few pictures during the installation, so let's see how the next few days pan out...

 

Very nice, that quaife unit is a real nice piece of kit, please keep us informed how the install goes, hopefully a shot of the 'machining' that is said to be needed to the inside of the carrier, and if they do it on a mill or just a die grinder?

bfsgross - did DTS get back to you with a price on the quaife, and price of quaife installed?

Besides a twin screw, an LSD upgrade is one of the must-have mods for my STR...

 

As mentioned earlier, Tom from TL Jaguar tells me no machining needed on my 2004 build XJR. Hopefully the pics will help clear this up once & for all.

 

What a nice compact unit! Very narrow body compared to my Torsen T-2R.
My Mark VIII IRS assembly is supposed to be assembled by next week.
I'll post pics for comparison.

 

I'll check with DTS tomorrow. Eric should have posted prices last week. Guess we don't matter too much? LOL!

 

Cambodia, would that be the same Quaif as the STR.

 

Cambodia! LOL! Spell check at it's best. Sorry dude.