before we go any further let me share with you the direct injection fundamental . figure below would describes the feature.
The direct injection can be divided into two:
central injection and side inejction. I have tuned the direct injection for central injection and I figure out the power and torque increased by 20% compared to port injection.
Tuning the ecu is the art or very subjective. One can only focus on the engine performance for high power regardless the fuel consumption. If the power is the main focus, the mapping for ignition timing must be right. we can play around the ignition timing to advance or retard. Normally, slightly advance will improve the performance but one must be very carefull of the engine knocking. Normal practice is to decrease few degree once the knocking occurs. it is time consuming but it really fun.
