Re: Injector Duty cycle calculations

[Scot Sealander <Sealand@clarityconnect.com>]

timsiford@hushmail.com wrote:

> Yes - this is exactly what I am thinking too.  Let me ask you a quick 
> question:  When the 730ECM reports injector on-time (pulse width), is 
> this the amount of time the injector is on for ONE off-on-off session 
> or the amount of time spend in a double-batch fire (off-on-off-on-off) 
> session?

The time for one batch fire injection.  off-on-off



> Its just hard
> to believe that Diacom is reporting 8.3-8.5ms at 6000+ RPMs.  That would
> mean that my injectors are actually on for 16.5 to 17.0ms per 4 strokes.
>  That's A LOT of fuel.  Does that sound correct?  Furthermore, when you
> consider the fact that my 24lb injectors are operating like 28lb injectors
> (due to the greater Fuel pressure) it makes 17.0ms of on-time seem like
> a A LOT for a naturally aspirated 350 for one 4-stroke rotation.  Any thoughts
> on this?  What does your EFI experience say?

That PW suggests about 400 HP or so.  What times are you turning?


> When did GM switch to SEFI?

Wide open question!  Do you mean when did the Camaros switch to SEFI?
That happened in the LT-1s in 1994, if I remember it correctly.

Scot Sealander

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