Nother thought

[Squash]

On the subject of high DC's for long periods...

I don't know what your idea of a long period is, but I routinely run 9-10.5ms at 5800-6200 rpms
for periods of around 10-15 seconds, sometimes as much as 30 seconds.  I haven't *noticed* any
degredation in performance of the injectors.

Not a street car, but it gets driven hundreds of miles to the "race" so-to-speak.

Squash

--- "Dave Zug." <dzug at delanet.com> wrote:
> 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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