I will chime in and may echo some of the same:
-
Yes, more cylinders help
-
To achieve more displacement in a smaller package, make an under-square engine (the stroke is bigger than the bore). This will also help shift the power curve to the lower rpms.
-
Low cam, not 0 though. (Automation extremes should almost never be used, they are a bit funky)
Depending on engine and year it can be anywhere from low teens to low 30s. Usually finding the most fuel efficient point is a good start -
Since Automation Turbos are stuck in the 80s, you either tune for fuel economy (low AR & less than 10psi boost) or use the turbo tuning guide found on these forums. Key is to make sure the turbos are NOT green in the air flow data screen. Instead, make sure either the Turbine or Compressor is yellow to red.
AR around 0.600 to 0.775 is probably what you want to shoot for if you tune for fuel economy.
Otherwise see the Turbo Tuning Thread -
Depending on year and head type, some negative quality on the top end can help keep the curve in the lower rpms (if you’re making a pseudo-diesel) and pushrod heads are a good choice for a high torque, low rpm engine.
-
A slightly restrictive exhaust can boost efficency and torque, and make the area under the curve bigger. The best tune for this is whatever boosts your torque best before causing knocking for a naturally aspirated engine. For a Turbo, the same applies but to a much lesser degree.
That’s all I have for you right now, if you have any questions just keep posting them 