GenBoard/Manual/Config/InjectorOpening (2006-03-16 04:43:08)

This image is needed for the injectoropening.

EffectiveFlowrate.png

Unfortunately it still does not show up in the manual.

[[Manual: Detailed.Output.Fuel.Config]]

Basic req_fuel calculation

Assume

Input data

req_fuel = D / N * 0.0012 / 14.7 / 0.755 / I * 60000

The constant 60000 is responsible for scaling output from min (coming from the injector cc/min) to msec unit we usually use for this. The other constants are self-explanatory.

Simplified equation is: req_fuel = 6.49 * D / N / I

Examples

D N I fuel pulsewidth (msec) req_fuel=0x..
1600 4 220 11.8 76

We usually use 50% of calculated req_fuel and scale up VE values (j[] table) to double values (max values around 200, not 100) for somewhat higher precision.

Note: bin/req_fuel.pl in firmware has a bit more featureful calculator, and there are many on the web.


Tuning software support.

PSITuner implements a tool to calculate the req_fuel. In the Tools menu select "Fuel Calculations"

fuelcalc.gif


See also