[Gmecm] BPC

[Rob Handley]

Has anybody looked in detail at the BPC value in $58 array F28?

If my calculations are correct, the standard BPC value is computed using the 
same value of injector flow rate that is stored at KDISFS, a litres/cyl 
value of 0.5, and a multiplicative factor of 0.5 (to compensate for the fact 
that the injectors are firing twice per cylinder firing).

Does this match others' understanding?

If so, then values for F28 for a new application can be directly computed 
from the standard ones, based on the new litres/cyl and injector flow rate.

Apologies if this is old news, but all the references that I've seen seem to 
consider the F28 values as something that you have to 'fiddle' with. I'm 
trying to get F28 set 'right' before mapping the VE table for my engine - so 
that a theoretical VE table computed from peak engine power/RPM will be a 
good starting point and then only the VE table will need to be adjusted. 
That's the plan, anyway!

Rob

P.S. I'm making progress in matching the coded BPW calculation with the 
ideal gas law, but still don't understand why the MAT' contribution should 
plateau at temperatures above 23.5 C. I've verified my understanding of the 
code by twiddling a pot on the MAT lines and displaying the F31M looked-up 
value via ALDL. Is there another place in the code where MAT is used, that 
I've missed?