Technical Pre-load specification for Uno turbo differential needed

[frankensteinuno]

Hi everyone,

I'm in the process of fitting a Quaife LSD differential into my mk2 Uno Turbo gearbox. To be able to continue I need the Pre-load specification for the differential bearings. I think its 0.12mm, but ''think'' isn't good enough.

I have a very helpful main dealer nearby who are trying hard to help. Also, I know that the Punto GT box is the same so this may be my next avenue to go down.

Any ideas will be greatly appreciated.

Liam

 

[frankensteinuno]

Some here must have a Uno workshop manual?

Liam

 

[lewey]

I have put a Quaife LSD in my Uno Turbo box. The measurement is not in a Haynes manual. I will have to look it up in my FIAT workshop manuals. I'll get back to you. 0.12mm does sound right.

 

[frankensteinuno]

Cheers Lewey! Do you race your Uno? Big difference with the LSD?

Liam

 

[lewey]

My opinion on the LSD is it helps when putting power down mid corner. You get used to the idea that more power actually aids turn-in, but it will not make up for poor suspension/tyres or make much difference in a straight line other than provide potent torque steer on uneven roads. It is quite an expensive distraction for a road car, since it adds as many new problems as it solves on some roads. It does all depend on your driving habits and style I suppose. My car used to race. I take it to trackdays now, but not much recently. Next summer I am aiming to drive around Spa, Belgium in it.

Here is a photo I took of the workshop manual (1989 -early Mk2). 0.12mm is the figure you want I reckon:

 

[frankensteinuno]

Cheers for that Lewey. Its all back together now with .12 pre-load.
My Uno is a hill climb/road car so the diff should make a big difference on the hill, especially when wet.

Liam

 

[lewey]

Cheers for that Lewey. Its all back together now with .12 pre-load.
My Uno is a hill climb/road car so the diff should make a big difference on the hill, especially when wet.

Liam

I will be interested to hear what you think. You will notice a difference!

In wet conditions, remember that if you have both wheels slipping nicely, as the diff will try to achieve when you hit the gas pedal too hard, you really don't have any control of the front end and straight-on accidents are a risk. With an open diff you get a bunch of wheel spin and lacklustre turn in, but a much more predictable drive. In a motorsport context, you might get a new set of problems to avoid, but master them and you should pinch some time.

I use to sprint and hill climb a Westfield with a Quaife diff. In a rear wheel drive car it just made everything better.

 

[frankensteinuno]

Interesting!

It seems I need to learn how to drive it hard again.
Pros; More straight line grip and more grip mid corner.
Cons; torque steer by the bucket load.
Pro/Con; Under steer at fast and low speed corners (once tamed very usable)

Early stages yet though. Will report back.

Liam