RE: Injector Duty cycle calculations

[Mike Rolica <mrolica@meridian-mag.com>]

Mike Rolica
Plant A,
Magnesium Products Division
Strathroy

(519)-245-4040  Ext. 244



	-----Original Message-----
	From:	Bruce Plecan [SMTP:nacelp@bright.net]
	Sent:	Monday, July 24, 2000 10:34 AM
	To:	gmecm@diy-efi.org
	Subject:	Re: Injector Duty cycle calculations


	Jus curious, was this with mufflers?. 
	Yes...barely:-)

	and how wide of range did it run, a
	band of a couple hundred rpm or several thousand?.
	Usually 5500 to 7500

	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.
	 
	Yes and can change in less than an hour... seen where engine was
running  .39.. then set valve lash..
	Had storm fron coming in.. next pull it ran .45's.....john playe
with carb.. got it back down to .40~.41...

	Also, one of their targets are MPG, and a street strip car's not
gonna be
	able to live at them numbers, IMHO.

	I agree... seem they have problems with exaust valves:-)... run
really hot...

	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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