Tables Y-axis query

[billjam]

Is there a reason why the Y-axis for the Spark Advance table, AFR table and Fuel VE table don’t start at zero?
Ignition Load starts at 25%, Fuel Load and AFR Load start at 15%.
Just seems odd to me that the tables don’t cover this area.
I am using ITB control algorithm for fuel and spark.

VE table.jpg

[grom_e30]

do you ever see 0% load when driving ect?? you can re scale the numbers to what ever you need to cover all areas of driving. but if you never see 0% load why waste the space on the table having it there.

[billjam]

I can see that 0% load is pretty meaningless, but there still seems to be a fair bit of territory between 0 and 15% (or 25% for spark) that isn't covered.
A fair amount of driving is under light throttle loads so I don't understand how the ECU knows what to do if the tables don't cover it.

[elutionsdesign]

Again as stated, you can click on any of those load boxes and make it what you want. You can give yourself great resolution where you want it by putting numbers closer together, letting them spread out in an area that isn't driven in so much. Same for the rpm boxes.

The ECU just does what its told, so if the load is 5 and your lowest box is 25 its just using the 25 box. Most don't worry about low vacuum since you're rarely there and there just isn't much fueling or timing difference between 25 and 5.

[billjam]

The ECU just does what its told, so if the load is 5 and your lowest box is 25 its just using the 25 box. Most don't worry about low vacuum since you're rarely there and there just isn't much fueling or timing difference between 25 and 5.

Thanks. That makes sense.

[muythaibxr]

The only way to get load below ~15 or so is to use alpha-n.