V.E. Table vs A.F.R.

[crazycalvin]

Is there a correlation between adjustment of V.E. table and how much it changes the A.F.R. for that particular point (cell)?  So if you went from 112.5 to 113 how much of a change would that make in A.F.R. for that exact point (cell) and is it linear (so changing any cell by .5 would give the same result)?  Thanks, Calvin.

[jabarr]

Standard rule of thumb is 1.0 change in VE changes AFR 0.1.  Not exact but it's close.

[Steve Cole]

VE is is the amount of air entering the cylinder. So with that in mind let's look at some numbers. Say you have a VE value of 50 and you add by 1 That increases the air by 2%. So the ECM will add more fuel for 2% more air. Now let's use 100 and add 1, That increases the air by 1%. So now the ECM add more fuel for 1% more air. So as you can see it's not going to be the same across the range of numbers you can place in the VE tables

[crazycalvin]

Thanks for the info.  Later, Calvin.

[FLTRI]

Standard rule of thumb is 1.0 change in VE changes AFR 0.1.  Not exact but it's close.

[crazycalvin]

Thanks Bob.  Later, Calvin.