Do you have the S4 car set-up sheets from 85 to 86 for most of the settings regarding diffs gears & suspension set-up's
Not sure if any of your team have the development book on the History of the Delta S4 that came out last year.
That contains the two spec sheets detailing the set-up of the works cars for the few rally s that it took place in that short 1985 & broken 86 campaign.
If not I could scan these once I have access to a working scanner mine needs fixing .
This is the book I am talking about , if you do not own it then I can only recommend it lots of info to be found in the text & pictures along with ever single paint job from the prototype to the last works cars . excellent book for those making skins.
http://www.rallyandracing.com/en/Rallywebshop/Books/Cars/Lancia-Delta-S4-Reprint.html?listtype=search&searchparam=Lancia delta s4
Now back in re-print to , though I hope they corrected the English translation errors , it was little rough in places , but a major effort of love for a private publication run & a much need rally car story to be covered in depth.
Much like the excellent book on the 0.37 from 7 or 8 years back that I think I now out of print & only to be found at stupid prices. but I find the S4 book more detailed compared.
Keep up the good work that you are doing ...