[Gmecm] Injector sense - addendum

[Ryan Hess]

What kind of BPW are you running at idle?

Running smaller injectors that run static @ WOT would probably eliminate the need for it, but I think the rule of thumb is to have it run no more than 80% DC @ WOT...

Ryan

Dig <turbodig at yahoo.com> wrote: Personally, I'd recommend shutting it off entirely.  We've found that it's somewhat tough to transition in/out of quasi-mode and maintain consistent AFRs.

Depends on what injectors you use, but there's really no need for the every-other arrangement. It's possible that TBI injectors would be an exception to this.  We've run #65 high-z with no pulse-width problems.

Simpler is good, and it seems like the fewer moving parts that the $58/9 code has, the better it runs.

Dig


----- Original Message ----
From: Rob Handley 
To: gmecm at diy-efi.org
Sent: Monday, September 3, 2007 3:01:22 PM
Subject: Re: [Gmecm] Injector sense - addendum

Phew! That's great news. :-)

It looks like, for $58, it's address $036A 'KAPLL', and the standard Sunbird 
value is 0.793 ms.

Many thanks Ryan,

Robin

----- Original Message ----- 
From: "Ryan Hess" 
To: 
Sent: 03 September 2007 20:12
Subject: Re: [Gmecm] Injector sense - addendum


> That is correct.  It doubles up on the BPW and fires half as often, 
> because the injectors can't reliably and accurately meter fuel in such 
> short times.
>
> There are some values in ROM you can change to set what this switch point 
> is.  It's called the "minimum base pulse width" or some such...  I think 
> most binaries have it set to ~0.98ms
>
> Ryan
>
> Rob Handley  wrote: Just had another go with 
> the new 'scope.
>
> If I read it right, when the BPW is very short (e.g. sub 1 ms) the 
> injectors
> AREN'T fired every crank revolution, but ARE every 2 (as I thought I saw
> with the old 'scope). This makes sense. Does it stack up with anybody's
> understanding of the code?
>
> This conclusion is based on me changing the relevant contents of the VE
> table, with the engine idling, from 30% to 99%. The ALDL-reported BPW 
> jumps
> from just under 1 ms to about 2 ms.
>
> Interesting.
>
> Robin

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