Do anyone know for a N/A S2000 engine, what A/F ratio is good for the highest Hp and what is the max exhaust temp at the exhaust mainfold that is Ok without melting the pistons?

Any people who had dynoed their N/A S2000 with the above data please post their results and opinions.

I had a V-AFC and will get A/F and exhaust temp meter and a Apex speed meter but I would like to know the way to tune my car for higher Hp.