Mazda MX-5 Miata individual throttle bodies ITB intake manifold – Part 1 – Intake manifold

Individual throttle bodies intake system for Mazda Miata MX-5 1.6 NA and NB. Basic throttle bodies are 40 mm in diameter. You can use the stock fuel rail and in injectors. Use injectors mount on the throttle bodies with a custom fuel rail. Later the stock Miata fuel pressure regulator will be integrated into the fuel rail. Short type injectors are needed if they are mounted on the predrilled holes near the head flange. Also, different throttle linkage system will be needed, probably one mounted underneath the ITBs. The vacuum ports on the bottom of the intake manifold are drilled and tapped. The vacuum block, is mounted below the throttle bodies. It has fitting for the brake booster, MAp sensor can be mounted directly on it, barb fitting can be installed and used for vacuum/ boost signal to the ECU as well. Further improvement will be to change the layout of the vacuum block, so the stock idle air control valve can be bolted to it.