Where can I get a tech breakdown on what type it is and how it works , how far back has Jaguar used this unit on the 4.0 V8 ?

 

The supercharger on the 4.0 and 4.2L V8s is an Eaton m112 model that is used in lots of different cars:
Roots Gen V (Fifth Generation Supercharger)

They are all the same internally but have different snouts and mounting bits depending on what vehicle they go into.

Earlier XJR6 models used the smaller m90. The new 5.0L uses an Eaton TVS which is somewhere between a roots type and a twin screw.

 

Some members on this forum have fitted the Gen V from a 4.2 to their 4.0 engines.

I thought there were some internal differences as well, helical gears in the V vs straight gears in the IV ?

 

I recall something like that upgrade Cambo. Interesting to look at the efficiency maps of the V 's vs. the newer TVS. Still, twin screw would be nice! TVS is part of why the new 5.0 engine hits 100hp per liter.

for anyone new to superchargers, and wanting to know the difference, here's an easy to follow explanation:
http://kennebell.net/KBWebsite/Commo...romcatalog.pdf

or this one from Roush:
http://www.roushperformance.com/blog...mustang-f-150/