Something like this for the newer motor you mean?
http://www.volkspage.net/technik/ssp/ssp/SSP_127.PDF
http://www.vaglinks.com/Docs/VW/Corrado/VW_Corrado_SLC_AAA_Repair_Manual.pdf
I don't recall seeing one specific for the newer engines, it's an engine put in various models so the Haynes or US equiv may have more there, I've never bothered using manuals, half the fun was in finding out over the years! There's probably tons of threads about online for more specific questions if you Google them though.