[T3] Giving up Stock FI

[Keith Park]

Good location for the WB in stock exhaust is a problem, Im running the
reccomended Ernst with the sensor on the left end,
Probably best but I didn't want to put it in the tailpipe and cause an
obstruction,  Ray claims the "lean spot" may just be
A red herring from the WB, but it also misses in this spot if too lean, but
adjusting the timing of the injectors does help with that, so cam timing and
FI timing is also a factor.

So much to consider, but at least with the closed loop system you can make
adjustments for these issues.  Problem is that with ME,
I might never stop staring at gauges, laptop graphs etc. and tweaking
things!

Keith
 


Topnotch Restorations
topnotch at nycap.rr.com
http://www.topnotchresto.com
71 Squareback  "Hothe"
65 Notchback  "El Baja Rojo"
93 RX7  "Redstur"
95 Chrysler Cirrus Lxi "Cirfogsalot"
"hanging out at the tail end of the bell
curve, and loving every minute of it!" 

-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of Max Welton
Sent: Tuesday, December 25, 2018 8:21 PM
To: type3 at vwtype3.org
Subject: Re: [T3] Giving up Stock FI

Ah. Copy all.

It seems to me that if you can get the 02 sensor located in your exhaust
where it can give you a true reading (see note 1), going MS would allow you
to draw up any target AFR surface (see note 2) you like and get the
closed-loop learning feature adjust the fuel map accordingly. After a bit of
driving and looking at logs and a little artistic "painting" of
under-sampled cells you will have a fuel map that will run perfectly fine
even without the WB input.

Still don't know what to tell you about on-the-road availability of a
replacement ECU should you need one. A failure on the board is something I
couldn't deal with. Although if I could get my hands on an equivalently
modded MS, I could refresh all the control tables from my tablet. My hope is
that a much more likely failure would be in my own wiring harness ...
which I could trace out and fix. And I try to make that all as solid as I
can so even that doesn't happen. Prevention first.

1) I am running an ISP Over the Top exhaust (not stock type-3) which
provides a nice place for the 02 sensor at the collector.

2) Note that I'm calling it a surface and not a curve. Each cell is indexed
to RPM and MAP. Same with the ignition. It's kind of a pet peeve with me.
An SVDA does not produce advance that follows a curve, it follows a surface.
An 009 follows a curve.

Max
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