I can't find the thread but I thought Steve_K_XK was going to document his Lincoln LSD into the XK swap? Steve is this something worth writing up? Are you satisfied with the result? What benefits did you realize? Any trade offs?

 

Subscribed.

 

Sorry boys

Yes currently running a 3.58 Lincoln differential in my Xk no codes no TCM adjustments.

Due to the shorter ratio it gets into 6 gear alot sooner on the city roads so fuel consumption actually started to decrease on the open road it's also very good 9-9.5L/100km

Now to the juicy part the xk is always in the power band now it feels a hell of a lot more responsive & torquey .

The big downside it's virtually impossible to launch it off the line now desperately need that quaife !!

 

Isn't that Lincoln a limited slip like the Quaife? What's the diff? (Pun intended )

 

 

is the Lincoln diff worse coming off the line than the OEM?

 

 

All other things being equal, the higher number (3.58 Lincoln) will be quicker off the line, 0-60 and 1/4 mile. But top speed will be lower, as will fuel economy.

That's why back in the day the drag racers preferred 4.56 or 4.11 gears. I recall that at 60 mph my '60 Vette with the 4-speed and 4.11 Positraction rear would be turning 2,000 RPM. Today's cars are geared for economy and turn around 1,200 RPM at 60 mph.

 

Thank you Steve. I was under the mistaken impression it was LSD. Going off memory and couldn't fine the thread.

 

Being a 6spd don't really find that fuel economy is affected .

Travelling at 100km it's sitting at roughly 1900rpm

That being said the Maserati gran Turismo with the xf6hp (same gear box) runs a 3.7 or 3.9 can't remember off the top off my head

 

Sean unfortunately there is no cheap solution when it comes to LSD for us it's either a quaife or open diff

 

From my experience with a 5.0 mustang Friday morning a higher ratio affects performance at top end too. No blower whine and loud enough that it wasn't turbo'd so N/A. It sounded like a NASCAR engine wound up tight as it went by.

Old //R just couldn't accelerate with it from 90+. The fact that the other guy was making poor lane keeping decisions made it difficult to disengage. Usually I just pull a couple car lengths for separation and slow down. This clown wanted to race in traffic. After he tried to pass three times and nearly rear ended the cars in the slower lanes I just slowed way down and he sat there flashing his high beams until an opening came up, blasted it and slowed back down a 1/4 mile ahead.

Kind of a crappy day commute because the ride home was through monsoon rains where one front tire or the other was hydroplaning a good bit at 45 mph. I eventually tucked in behind a semi and rode in his tracks.

 

Resurrecting this thread.

Do I recall correctly a thread in which someone took an e-diff from an XF and put it into their 07-09 XKR??
I cannot seem to locate the thread. Can anyone else?

Though I had the Quaife in the XJR and liked it very much; I am looking for an alternative cost effective LSD solution for my aging xkr.
Thoughts anyone?

 

I think the E diff has it's own bundle of problems. One being fit and the other being control. Add in that they tend to eat themselves and...

 

I've wondered why they went to an E-diff but I assume it was for gas mileage. I hadn't heard of it until I got my car but now I'm seeing it more often and especially trucks. I've always had plain old posi units in most of my fun cars so this was a new one on me. I don't abuse mine so hopefully it won't become a problem.

 

Thanks guys! OK... IS there another option other than the $1200 ++ Quaife?

 

No chance to retrofit an E-Diff to a 4.2L XK or XKR, for one simple reason that the software in the various modules of the car is missing to control it.

You might be thinking of the chap who fitted the mechanical LSD from an F-Type V6S into his 5.0L XK. This was easy because the diff in the 5.0L XK is the same make/design as the F-Type V6.
So it worked out fine for him, however there is an additional complication with doing that swap into a 4.2L, the driveshafts are a different design, as well as the propshaft.

You can buy a kit of driveshafts and propshaft for the 4.2L XK which will work with the F-Type V6S diff, but good luck finding them 2nd hand.
Retail price for a new shaft kit in the USA is $1825... then you also need to source the diff itself...

 

That's exactly what is was. Thanks Cambo.

 

Open diffs actually track better in the twisties. It's when you need the power to the ground that the posi comes in handy.

 

Judging by time slips of users with Quafie , there isn't much if any improvement in 60ft over open differential. Unless I'm missing something ...