Need 12V info/specs=power

[mph180@juno.com]

I am new to group, have posted some questions and received some answers. 
Appreciated.  Now on my power quest for my cute 1993 90Q I will possibly
build a turbo kit for engine.  Still don't have service manual, guessing
I will have to spend $500 at Audi dealer.  

Here is what I need-

For 2.8 litre 12 Valve V6 

Compression ratio
Intake and exhaust valve head diameter.  
Number of main bearings on crankshaft
Location of stock ECU
Does engine have crank trigger?  If so what type? (62 tooth etc)
Bore and stroke

Also would like to find aftermarket low compression pistons for it or a
machine shop to cut new pistons.

All help appreciated.  Wish me luck, I have done lots like this before. 
(first Audi)

Good day
Noah A Davis