----- Original Message -----
From: "Shane Moseley" <smoseley@ix.netcom.com>
Subject: Re: DML: IAS Sensor Relocation..Attn: Bernd
> > During cruise conditions, the TPS, IAT, MAP, O2, CTS (Coolant Temp
Sensor),
> > and other "variables" come into play as well since there is never a
> > consistent load on the engine.
>
> Any time you change the TPS by a large amount - you go into an enrichment
mode.
> Either positive enrichment or negative enrichment. This means more gas or
less
> gas corresponding to more throttle or less throttle. You can watch the
result
> of this behavior on an A/F gauge. During enrichment modes - IAT, MAP, and
CTS
> are indeed referenced. If the delta-TPS is stable for even a few
seconds - the
> computer "closes the loop" and uses NOTHING but the O2 sensor to determine
fuel
> delivery strategy.
On daily driving...the load changes too often to consistently be in a static
"Closed Loop" as you described it. Stop and Go, passing, highway driving,
all of those will change the results.
> On your scanner "Engine Load" is the MAP and fuel-trim% is this enrichment
I am
> referring to (short term FT that is). Yes - scanners are cool. I have
one
> also. I am in the process of writing my own. ISO-9141-2 to RS232
hardware is
> getting cheaper everyday (less than $50). If you would like to know what
all is
> involved in building a scan tool from scratch - or what procedures you can
use
> to diagnose problems with yours - check HS-3000 (a book) from sae.org -
around
> $79. I'm not assuming you are having problems or anything - just thought
you
> might be interested.
>
Cool...let me know what you come up with.
>
> Latr,
>
> Shane
>
> --
> '96 IndyRam-HisIndy-MPI/TB/Pulleys/Coil/Wires/CompTAs
> '96 IndyRam-HerIndy-numbered(#142)"Track Truck"
> '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle
> '68 Black Corvette Convertible 427 (For Sale)
>
>
>
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 11:50:36 EDT