Mfanto

I have a 93 fd3s with greddy SMIC, HKS downpipe, cold air box, hF cats, greddy exhaust, HKS BOV, Apexi Power FC with commander, and some other extras...I am running stock boost at 10psi can I up the boost a bit? If so how much?

Mahjik

iTrader: (1)

You can increase the boost as far as your tuning will allow. There are a lot of things to consider when increasing boost: Air/Fuel ratio, Intake temps, injector duty cycles, etc..

Check the PFC section about tuning. You can usually find maps that are similar to your setup to start with or get it tuned by a professional.

technonovice

You should use a wideband and aim to keep your injector duty cycles at 85 % and below.

Mahjik

iTrader: (1)

Duty cycles are not nearly as important as A/F ratios. A/F ratio should be the #1 priority as well as intake temps. Duty cycles can be important, but not nearly as important as the others.

Check this post for some info:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/what-situation-do-you-have-259912/