[Gmecm] BPC

[Rob Handley]

Typical! I work this BPC stuff out for myself then find it on thirdgen.org.

Now trying to find confirmation that the standard Sunbird injectors are
rated at: 4.5 US liquid gallons / hour...

Rob

----- Original Message ----- 
From: "Rob Handley" <Robin at FuryWorld.fsnet.co.uk>
To: <gmecm at diy-efi.org>
Sent: 16 September 2007 11:34
Subject: [Gmecm] BPC


> 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?