AFR wise it really depends on what you are trying to do.

For initial tuning aim for an AFR of 13, dropping down to 12.5 ish after peak torque for very low boost ie, less than 7psi.

Aim for 12.5 dropping to 11.8 ish for under 14psi

I personally prefer higher AFR's for high boost than most people as long as the engine is not knock limited etc. for 18psi I try to achieve an AFR closer to 12, normally 11.5.

For track cars or cars which are likely to be at high load for long durations I go much richer to cool the combustion chamber, at the expense of oil life, power and engine life.

This works for me, different people do different things.


But for you, I would start off by aiming for an AFR of 12 at any boost level. You can make it leaner or richer later...