Re: Injector Duty cycle calculations

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

> 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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