Team3S: 3000GT & Stealth Monday, October 14 2002 Volume 01 : Number 971

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Date: Sun, 13 Oct 2002 10:56:42 -0000
From: "Jeff Lucius" <jlucius@stealth316.com>
Subject: Re: Team3S: Why do many have low (11V) voltage at the fuel pump?

Well, until Mitsu or one of their engineers officially documents the internal
workings of the engine control module, we will never know for sure exactly how
the ECM performs its magic. However, widely available publications from
acknowledged authorities do give us some clues.

I have finally had a chance to briefly search through my library, and the
following two books were helpful.

Horst Bauer (editor-in-chief), 1999, Bosch Gasoline-Engine Management, 1st
ed.: SAE International, 370 p.

Charles O. Probst, 2001, Corvette Fuel Injection & Electronic Engine
Management: Bentley Publishers, 388 p.

The Bosch book (p. 279) re-affirms the Mitsu technical manual description of
how basic injector activation time is calculated: "The base injection timing
is calculated directly from the load signal and from the injector constants."

The "load signal" in our case is the calculated A/N values (basically air flow
per cylinder each revolution) and the "injector constants" are the stored
parameters concerning injector flow rates at idle differential pressure and
boost differential pressure (~34 psi and ~43 psi, respectively).

So Bosch and Mitsubishi have plainly stated it is a direct calculation. Other
ECM actions obviously and correctly use look-up tables (or maps). But I
believe this discussion started with how the *basic injector activation time*
was affected by fuel pressure or other factors.

Chapter 5 "Control Module - The Brain" in Probst's book makes interesting
reading also. While it is concerned with the control modules used in
Corvettes, the principles apply universally.

Date: Sun, 13 Oct 2002 12:16:13 -0500
From: "merritt@cedar-rapids.net" <merritt@cedar-rapids.net>
Subject: RE: Team3S: Spelling Master :)

>
>Original version 2:
> "has a small dent in the left front fender and busted
> lens but looks ok other than that, has new *tiars*"

Date: Mon, 14 Oct 2002 11:25:33 -0500
From: "Morice, Francis" <francis.morice@retek.com>
Subject: Team3S: Inj. Duty Cycle for 550's and DR650's....

Anyone know where I can find this info? I looked on www.stealth316.com, but couldn't find it.

End of Team3S: 3000GT & Stealth V1 #971
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