How much for a limited slip diff?

Where to buy?

How to install?

What ratios are available?

 

What kind of car?


Cheers
DD

 

What car?

 

Eh heh.....sorry about that ....

A 2002 XJR

 

I only know places in the UK.

TL Jaguar TL Jaguar | Jaguar Servicing Surrey

Racing Green RACING GREEN CARS | Modern & classic thoroughbred Jaguars

You're looking at £1000 for the diff and another £500 to fit it.

Uses your existing crown wheel & pinion, so whatever ratios are available, are available...

 

I bought Quaife QDF5W from Racing Green Cars. Took about 20 hours of labour from a local Jaguar shop to fit it since the rear axle needed to remove and they made this kind of job first time. Some bearings were changed at the same time. Not very cheap modification if you do not make the job yourself.

 

I see it is about $1400 in parts just for the dif. I can do the labor. A bit more involved than my mustang rear end swaps I see, but likely worth the work in the end <---that was a pun, heh heh.

 

If you had trouble wiring in your water meth kit you don't want to take on installing the Quaife unit. It is a project that should be taken on by someone who understands rebuilding diffs. you will probally spend 2-3 days on this assuming you have the proper tools.

 

Yes,

I was going to turf this mod to my brother and his crew. They rebuild entire motors overnight. He has completely re-worked his Pantera GT-5. Engine, ZF transxle, 6 caliper brakes, etc, etc, has a 408 stroker that left another pantera standing still when they both floored it at freeway speeds. The other pantera recently dynod at 550 RWHP. Big brother knows these things. I was always just the driver. After seeing it done correctly once, I could duplicate it on my own. There is no shame in this.

When I had a few 5.0 mustangs, things were super simple, with the Jag, since their wiring is way more complicated, I want to make sure my plan is solid before I change things.

The issue I had with the meth kit was where to get a source of key on power from under the hood without running a wire from the trunk. The install of all the hardware was cake. I'm just waiting and getting the info I lack so I can make a nice, clean install, and not have a wire coming from the trunk. Research, plan, verify, then act...

I tested the kit today using an always live power source. Everything works correctly and it appears I have the right size nozzles, even with only stock boost. 2 x 225 ml/mn

It is true that I have not worked on cars for 20 years and am completely new to Jags, and am not familiar with reading schematics, but I am able to learn. I am quite scrappy and resourceful, which will become apparent as time progresses.

At the moment I am just the little grasshopper, at the moment.

 

OK,

Searching around the net, the fastest 1/4 mile I've seen posted for an X308 XJR was Matt Moran at 12.4 with 17-18 psi, intake, little bit upgraded inter cooling, 100 octane, exhaust and MT drag radials. He has a LSD, but said it was only worth one tenth at the quarter mile, but did solve his traction issues.

Given he only found it to be worth one tenth, I'll shelve this idea for now and wait until after I've upgraded power and it becomes mandatory. I'm not yet seeing the return on investment before I have more serious traction issues.

 

I'd agree that it's less of a "must have" in the X308, the X350 on the other hand.... suffer from traction problems a lot more.

The lads in the UK discovered at a track day that an X308 with a pulley & exhaust, was quite a bit faster than the X350's with pulleys, exhausts, intakes, whatever.

The problem seems to be the air suspension in the X350 doesn't allow the cars to squat at launch & shift weight over the rear axle. The X308 with traditional coils launches a hell of a lot better, and could put away a faster time despite having less power, and being heavier.

I've not taken my X350 down a strip yet, but based on how easy it lights em up on the street from a half-throttle standing start, an LSD is a must for us...

 

"The problem seems to be the air suspension in the X350 doesn't allow the cars to squat at launch & shift weight over the rear axle. The X308 with traditional coils launches a hell of a lot better, and could put away a faster time despite having less power, and being heavier."

Import some air from Denver Co!

 

???? Does Denver air "squat" better??

 

Ihnfiwhita

 

You betcha!!! I use it in all my tires, since its less dense it gives a much better ride.