I'm curious if anyone upgraded to a limited slip differential (LSD) but left the rear ratio alone?

Anyone change the rear ratio only and keep the stock differential?

CoventryWest Pete told me there is no point using one of their rebuilt on-demand “‘Powr-Lok” posi-traction LSD units from the 6 cylinder XJR on my XKR without also changing the rear ratio.

The nearest Quaife LSD dealer/installer has no experience or knowledge of installing the Quaife on our units although I realize others have already done it (e.g. mjlaris).

Upgraded anti-roll bars have already been ordered and should be installed by end of month when they arrive, so yes, I'm getting things done, not just asking.

 

I have a quaife QDF5W on my xkr

 

but did you just do LSD or did you also do rear axle ratio change?

 

The rear axel ratio mod and LSD mod should be independent of each other. However, if you have a 2000 to 2002 XKR with the Mercedes transmission and want to do the real axel ratio change, you need to get a reprogrammed Transmission Control Module (TCM). This is expensive; it cost me $2000. The 2003 and later XKRs have ZF transmissions and it is my understanding do not need reprogramming of the TCM. Do a search on this forum as there have been previous discussions on this subject.


Mark

 

Just LSD

 

Deuce, so tell us what you noticed about having an LSD.
If you hit a series if S curves does it put the power down better?

mjlaris, thanks, my notes summary was opposite of what you had to do re the tcm reprogram. You have pictures of your car? Cars with two key modifications as yours ( lower sc upgrade and LSD) should be called XKR-R.

 

I've read that these cars use a dana44 gear set. Does anyone know if this is true and if so can one just use off the shelf dana 44 ring and pinion to change the ratio (electronics not withstanding)?

If not where can gears be found for a ratio change? I would rather not swap the differential housing.

I am more interested in a ratio change to lower gear than in an LSD.

 

I've never heard of a dana44 gear set. I got mine from XKRacer it's from an XJ6 I believe.




What kind of pictures are you interested in seeing? I have attached some general photos, if there is something in particular you'd like to see, let me know.


Mark

 

Read more here:

https://www.jaguarforums.com/forum/x...rential-75332/

 

mjlaris, thanks, how about interior pics: walnut panels, your dash...

Also, my research into rear anti-roll bars is almost done. Will make a separate post when I have all the details. Bigger front one already on order from the UK, one of the last few R Pack ones left (no rear R pack ones).

 

I forgot who makes the diff but I know it is not a Dana. The only direct bolt in rear end with a different ratio is the 3.27 as fitted to a Mexican market XK8.
98 99 00 01 02 Jaguar XK8 Carrier Assembly EXC Mexico MKT 520151 | eBay

This can be fitted to a 4.0 XK8 with no mods. It will also work on a 4.0 XKR but requires the TCM to be reprogrammed.

 

What do we call the cars with a LSD & a Twin Screw? XKR-RR?

 

The pirate edition... XK-AAARRRR

Thank you, thank you. I'll be here all week.

 

I don't have any good interior photos at the moment. After I had the door cappings and inserts installed, it made me realize how much the rest if the wood dash had faded. I then had the rest of the dash restored so now it matches fine and looks great, at least in MHO. However, 5 days after getting my XKR back I started having chest pains and 4 days later was on the operating table for a triple bypass. Just as I was starting to feel better, my fuel pumps failed. My car us currently with the Jag Dealer getting replacement fuel pumps installed under my extended warranty. I should get it back this coming week and will then take some interior photos for you.

Mark

 

We all hope you get better Mark.

As for CCFulton, the pirate edition... that was funny. I have to go swab the deck, and jib a hoist (or something to that effect)

 

Yup.

OS Giken Super Lock TCD.

I tried contacting Quaife, but the guy working there was a douche and wasted two weeks of my time having a useless convo with one of his distributors when he could have just answered my question directly in the first place. Freaking idiot.

 

So Xenophobe, you already have a write up of what your OS Giken did for the car's handling and where you noticed it? Express yourself. I recall you were evaluating different types from that vendor, and that AVOS really favors clutch type LSD for sharp cornering and drifts.

 

Here are the photos I promised.