Re: Injector Duty cycle calculations

["Bruce Plecan" <nacelp@bright.net>]

Jus curious, was this with mufflers?. and how wide of range did it run, a
band of a couple hundred rpm or several thousand?.
The 2 barrel guys are really doing some odd stuff, and while they can get
these numbers for racing, a season's racing is barely a weeks worth of
normal street driving.
Also, one of their targets are MPG, and a street strip car's not gonna be
able to live at them numbers, IMHO.
I'm not saying impossible, just that it's a major effort
Grumpy

> Ya .3* bsfc is hard.....really hard..
> I was running roughly .476......
> Seen some 2bl carbs for cascar series street stock at .39~.41...
> That was allot of time and r&D.......
> Mike Rolica
> Plant A,
> Magnesium Products Division
> Strathroy
>
> (519)-245-4040  Ext. 244
>
>
>
> -----Original Message-----
> From: Bruce Plecan [SMTP:nacelp@bright.net]
> Sent: Sunday, July 23, 2000 11:44 PM
> To: gmecm@diy-efi.org
> Subject: Re: Injector Duty cycle calculations
>
>
> > I believe (if I remember right) having a run from a 94+ LT1 where
> it
> > changed from SEFI operation to batch fire at a certain RPM and
> TPS.
> > It was all in the same run, and appeared to change, and knowing
> diacom
> > it may be rigged to report it always as batch fire, and his
> injectors
> > may just be permanently open at those kind of rpms, I don't think
> he
> > could be getting by with only 10-11 ms out of 20.   The motor as
> > described would have somewhere around 410hp at the rear wheels,
> and
> > probably about 450hp at the motor.
> >
> > 450 / 8 = 56.25 lb of fuel per injector.
>
> No that's HP / cyl.  or about 28 lbs per hr at .5
>
> > 24 / 56.25 = 0.42 BSFC (which is dooable).
>
> Not really.  .45 alot takes work
>
> > (24 * .9) / 56.25 = .384 (which is probably also dooable).
>
> Only .38s I seen accurately reported were bikes DOHC 4 valve per
> cyl..  And
> again by the best tuners
>
> > Given that after I leaned mine out, my motor got a bit hot when
> > running WOT for long periods of time (RR, 20 minute sessions), I
> > almost believe GM is running things excessively rich to offset not
> > having enough cooling system.
>
> Nope,  bet ya it's about having enough correction with out major BL
> ? Int
> numbers to go for the EPA testing.  Last thing they'd so is risk
> motors over
> radiators.  Also, richer is alot cheaper warranty wise then lean.
> Grumpy
>
>   Mine was not lean enough to be
> > knocking, but it was a huge amount leaner than stock.
> >
> > Roger
> >
> >
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