Affordable Wideband ECUs - How to?

[Garfield Willis]

On Fri, 31 Mar 2000 15:33:57 -0500, Scott Knight <scott at scottknight.com>
wrote:

>Hey! Finally something I can contribute to here. I have had my FP box
>running on the racecar very happily with the wideband.  The sensor I
>have has stamped on the sheetmetal where the 5 wires go in:
>
>   L1H1
>NTK  JAPAN
>
>and on the wrench flat:
>
>6Y13

Moto bene!

Actually, they all say L1H1, whether the "normal" direct-from-NTK, or
the Honda-NTK sensor. The direct-NTK will have a "CSS0xxx" engraved on
the sensor cuff as well.

>and the part that goes into the exhaust stream has a single ring of 6
>holes plus 1 in the end.
>
>Does this do any good?

Ahh yup, that's almost certainly a Honda-NTK sensor! The NTK-direct
sensors have a set of two rings of staggered holes. Does yours have the
original grey plastic Honda connector on it perhaps, with the cal
resistor molded into the plug? If so, measuring the cal resistor will
tell you if you've got a sensor they bought from Honda. They've probably
removed the Honda connector, tho. Heh heh, I had suspected this, but
just wasn't sure. NTK themselves is reported to be about to obsolete
their older sensor and blue box, and come out with a *non-compatible*
newer sensor and box. I'm just wondering if they as well will roll over
to these later sensors, and in effect unify the entire NTK sensor line.

Just curious, for someone with a manual, do they spell out a free-air
calibration step for the sensor? Be sad if they haven't taken advantage
of that.

>From the software side, there is not much that you do to enable the
>wideband.  Basically, a checkbox turns it on.  The adjustments are High
>RPM, Low RPM, Cold and Hot Closed Loop Delay (in sec), Closed Loop Gain
>(%), Max Closed Loop Step (%), Min Temp (º).  Beyond that are only the
>A/F ratio table and some correction limits.

Great, now all we need is someone with a later one, and a manual, and
can also see any revs/changes they've done from the above nicely simple
setup to the current one (maybe still just the same; I'm not hinting at
something I know, I don't know squat about the FelPro box). Interesting
they control the slew-rate of the fuel servo via a max step size. That's
pretty conservative an approach.

That's a good start. Gives more credence and confidence to others that
given the wideband interface (EGOR or NTK or ??; but something cheap
please :), and a controller mangled or designed to use it, that
WOT-closed-loop control is suddenly about to become very affordable AND
prevalent, so we'll have many more experimenters discussing and
perfecting it. Interesting times.

Gar


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