avcr and safc settings - long reply
The duty setting will be different for each car. What you want to do is set your boost value to 1 Bar ( the closest the AVC-R will do is 1.05 kg/cm², from memory) and put the duty cycle to about 50%. Take the car out and give it some gas, but keep an eye on the boost reading - if it doesn't get to 1.05 increase the duty setting slightly, if it overshoots STOP and lower the duty setting. Keep doing that until it holds at pretty much 1.05kg/cm².
Once thats set, you can let it do the self-learning thing (put it in 3rd or 4th, foot to the floor till the duty cycle setting says ***). The other relevant bits are the Feedback speed (how quickly it tries to correct over-or-under boost) and the Start Duty in each gear. If it holds perfect boost in say third, but spikes a bit in first & second you can use the start duty to reduce the actual duty in that gear (i.e say your duty is 67%, if you make the start duty -4% the actual duty will then be 63% - just an example). Also if it doesn't quite make full boost in 4th you could use Start Duty to help it along.
Some people leave the gear-based learning switched on, (Learn-Gear option) some turn it off. Try both settings, on mine it doesn't seem to make much difference. You can also adjust the duty curve to try to bring the boost in earlier by going to the Boost-Duty screen, then pressing Next. It will give you a bar chart of Revs (at each NE-Point you set) against Duty, and if you use the arrow keys you can raise or lower the duty at each rev point. Apparently the AVC-R is a bit conservattive when it self-learns, but if you do this, check you're not overboosting afterward.
Phew! :shock: Hope that helps you out.