Although the viscodrive is sealed from new, I was wondering if anyone has ever tried to change/ uprate the vc fluid, bara motorsport can change vc fluid for different applications, but has anybody on the forum tried this.
Mike

Never heard of anyone doing it - the standard unit seems to be pretty effective (and actually more effective than a Quaife in some circumstances)

I bought one years ago to do the very same thing but, as far as I could see, there was no way to open it.

I will give Bara a call and see if he has done any work on one, will report back and let you know

There is also Scara who propose some upgrade with original viscodrive

Visco perfect solution for road use. Quaiffe ATB diffs can be a bit hairy on the road.

This guy does a fluid upgrade (says 300NM) for £450...
https://deltaparts1.wordpress.com/deltaparts-shop/transmission-and-driveline-part-2/

The integrale viscodrive is different to the coupe one so you won't be able to upgrade it unfortunately

I see. But can the grale unit be fitted to the Coupe driveshaft?

no

I have an original old stock Fiat p.n. 7673708 for sale in eBay, if anyone is interested.