Nother thought

[Dave Zug.]

To clarify, What Pulse width (in Ms) are you calling 100% DC  at 4500 RPM?

Were your PW's constantly INCREASING as RPM went up?

My 383 CI (360hp thereabouts, almost same cam as yours- less flow above 5500
though, stock lower intake) uses stock 22# and stock FP almost, hits 85%
static for a BRIEF moment after the shifts. o2's still on the rich side
according to GM sensor (093) , and plug condition backs it up.

This is not meant as evidence contrary to your observations - just more info
to add to the collection.,.. mine and yours.

----- Original Message -----
From: <timsiford at hushmail.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, October 05, 2000 9:49 AM
Subject: Re: Nother thought


> I was running the stock 22lb injectors on my IROC (218cam, AFR heads,
MiniRam)
> for about 3000 miles before swapping to 30lb injectors.  At WOT I would
> reach 100% DC by 4500rpms.  I would continue to shift at 6500.  This is
>  great example of how the stock O2 cannot be used for tuning.  The O2
volts
> were approx 830mV and greater throughout the entire RPM range even though
> I was hitting 100% DC.  After switching to 30's I noticed significant
improvement.
>  The stock 22lb injectors never falterered and still function great.
>
> Tim
>
> At Wed, 4 Oct 2000 23:22:33 -0400, "Bruce Plecan" <nacelp at bright.net>
wrote:
>
> >
> >Anybody have any info., about the extended effects of running really
> >high
> >DCs on injector drivers?.
> >Just thinking, out loud.
> >Just with all the hours of running stuff here, I can't find any real
> >reason
> >for for the 85% DC, as applied to a street car.
> >Just maybe do to worry about a worse case thermal situation, and
portecting
> >the devices?.
> >Or maybe just a ol wifes tale....
> >Bruce
> >
> >
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