Limited slip diffs

[chargerman]

Hi guys

Just wondered what the general opinion/feedback is regarding LSD's fitted to rear wheel drive vehicles?

Conventional plate or newer ATB type's, which is best, or more progressive, or provides better traction, or more fun!

Thanks in advance

[GavinPearson]

What is the application?

[chargerman]

Hi Gavin, you may be just the guy to help me, seeing as you have a jaguar background

It's for a 98 xjr, nobody currently makes one to fit my vehicle, I believe Arden are comissioning some from Quaife, but will expect them to be reasuringly expensive,

I have found a company that reckon they can do me a one off special using a gripper diff, checked gripper's website, and all seems good, but everybody says there diff's are the best in the world. blah blah blah

[cptsideways]

Get the welder out

[GavinPearson]

You're in luck.

Salisbury made a 3.06:1 gearset for the 15HU diff as fitted to XJ40 & X300.

Obtain a secondhand Pow-R-Lok diff, A frame, front pressing & tie rods, ideally use a very late model X300 unit.

Have Dana or somebody competent rebuild the diff with new plates but stack them so that all the friction surfaces work together, and using the 3.06:1 gearset you will have an LSDd X308.

Obtaining the parts may be an issue but it is possible.

You can also make a diff to suit the 14HU case using X300 output shafts ground laterally & X300 internals with a new carrier made from EN8, this was what was fitted to one of the XK180s. I know this because I designed it and had it built. This is not a perfect solution but it is an awful lot better than no LSD at all.

[chargerman]

Hi Gavin

Thanks for the reply, thats some shopping list you've set me there, it's all available somewhere i guess tho

I have a good spare diff assy already for my car, do you think i may be better off getting someone to modifiy it as ness to accept the lsd spool instead of the regular planet gears?

Could you recommend any companies from your previous experiances?

Dave

[2woody]

Is your '98 XJR a 6 or 8-cylinder ?

All of the 6-cylinders were LSD, auto or not. I suspect the same is true of the V8

[steve-V8s]

Have tried both the original plate and a torque biasing type Difs in my TVR. To be fair the original had done 45k miles so may have gone off a bit but getting any power down out of corners was challenging with the inside wheel generally spinning. Standing starts however usually resulted in both wheels spinning equally. The ATB is a lot better at sending power to the appropriate wheel provided it is not actually off the ground. If you plan to bounce off curbs and have one wheel in the air then the ATB is not a lot of good.

On the road I would go for the ATB because they are so progressive, on the track probably would chose a tightly setup plate type because they still work if one wheel is off the ground they do however make the car more difficult to drive.

[chargerman]

My 98 xjr is an 8 cylinder

Definatley is just a regular open diff, i've had the back cover off and there's no lsd to be found

As it's only for the road I do like the sound of the progresive nature of an atb diff, but availabilty may be harder/more limited choice of manufacturers.

I'll wait until I have found a price for the Arden diff, give me some time to save up the money also

[GavinPearson]

I'd rather have a gripper plate diff than an ATB.

Locking under drive and open on overrun is much more sensible.