EFI Questions

[dzorde]

See what you mean.  In an OEM situations this actually seem like a very
valid explanation.  As my ecu is purely an aftermarket unit designed with
racing in mind it would then seem logical to not include this as the cars
would not have cats on them and hence this could very well be why I'm just
reading an initial lean on coast down until the engine requirements catch up
to what the ecu is feeding it.  Meaning that my system is actually
functioning correctly.

Dan     dzorde at soanar.com.au

-----Original Message-----
From:	ECMnut at aol.com [SMTP:ECMnut at aol.com]
Sent:	Friday, January 29, 1999 9:56 PM
To:	diy_efi at efi332.eng.ohio-state.edu
Subject:	Re: EFI Questions

Hi Dan,
 I believe most of the GM stuff shuts off the injectors for 
"coast down" conditions, but  they give a *blip* of max pulse 
width, once in a while, just to supply some fuel to keep the 
convertor lit.  
 I was recording dragstrip runs with a diacom, and could not 
figure out what was causing the injector pulse to spike from zero
 to 32ms(!) while coasting down at the end of the runs..
At 4000 rpm, that is something like 4 Revolutions of full
time injector spray.. I have a speed density 6cyl, 
where all of the injectors fire together....
I have a graph of a run at the bottom of the page, at
 http://www.enzoco.com/mike/syclone/monitor.htm
It is a tall page, so scroll downward if you are interested..
HTH
Mike V