from the FI supplement book,
WEBER INJECTION-IGNITION SYSTEM
The Model Alfa/N Weber injection-ignition system, in which engine speed and throttle valve position are used to measure the amount of aspirated air, notes the amount of air and meters the fuel accordingly. Other sensors within the system allow the base strategy to be changed under special operating additions. The engine speed and the throttle valve angle allow the optimal ignition advance to be calculated for every operating condition. The amount of air drawn in by each cylinder for each cycle will depend on the air density in the intake air manifold, the unitary displacement and the volumetric efficiency.
Volumetric efficiency is established experimentally on the engine for its entire operational field and this is then programmed in a map in the computer. The injection system is the sequential multi-port type meaning fuel delivery to each cylinder is independent of conditions at the other cylinder. Fuel delivery for one cylinder can occur during the combustion and exhaust phase of the other cylinder. Fuel delivery timing for starting is also in the map in the computer. Ignition is by static induction spark with dwell control in the power module and spark advance curves programmed in the computer.
I feel like doing some experimenting with different settings of the TPS