We were also trying to see how to add additional fuel for turbocharging. Modding the high-pressure direct injection pump for higher volume and getting bigger direct injectors was going to be super expensive and difficult. So we decided to use additional port injectors for the extra fuel we’ll be needing. The plastic intake manifold is going to be problematic to modify for injector bosses, so we will need to make a spacer between the manifold and head to mount the injectors on.
The Renault high-pressure direct injection pump is different from others on the market so we could not find another pump to modify for more capacity. Adding the port injectors has some advantages, such as keeping the intake ports and valves clean.
Another view of the high-volume EGR valve. It has more precise electronic control probably due to it being used for pumping loss reduction as well as the more traditional NOX reduction.