Cyberdyne A/F meter

[Jim Pearl]

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I don't mean to sound skeptical of your results but if the Cyberdyne =
gauge is using a standard sensor it's nearly impossible for it to do the =
things you've described. The readout from the "standard" sensor(s) is =
NOT linear and they operate more like a light switch than any sort of =
A/F sensor (so I've been told many times). Just out of curiosity - did =
you ever compare the readouts given by the gauge with a true A/F meter =
such as a Horiba? If they compared closely I'd believe it otherwise I'm =
more inclined to believe that the Cyberdyne gauge is nothing different =
than the Edelbrock one. BTW - ever ask Cyberdyne what happened to their =
digital A/F gauge? This was advertised awhile back and I'd seen pictures =
of it. I called Cyberdyne and talked to an engineer about it - he told =
me they never could get an ACCURATE reading from it, it used the same =
sensor as your $30 model. Sorry...

Bottom line - O2 sensors the manufacturers use in cars are meant really =
only to give the computer an indication when it's either below, above, =
or right on stoichmetric (sp?). Since the computer is either attempting =
to hit 14.7:1 or ignoring the sensor the manufacturers saved a few =
pennies and used a sensor that's not very sensitive to other ratios. If =
you search the net (DIY page?) you'll find a very detailed account on O2 =
sensors that explains much of this and even an article where someone =
disassembled the Edelbrock unit and had few nice things to say about =
it's design. Perhaps the Honda O2 will hold promise down the road?

----------
>From: 	SRavet at bangate.compaq.com[SMTP:SRavet at bangate.compaq.com]
Sent: 	Thursday, January 18, 1996 7:04 PM
To: 	diy_efi at coulomb.eng.ohio-state.edu
Subject: 	Cyberdyne A/F meter

This was posted to the monte carlo list.  Can anyone comment on the=20
accuracy of the Cyberdyne A/F meter?  This thing apparently costs about=20
$30...

-------------------

Steve- I too am amazes at my next statement, but the Cyberdyne *can* =
tell
the aproximate a/f ratio with their 10 segment meter!! With the meter =
came
a sheet that has the meaning of eack segment of the gauge. It gives the
a/f mixture for gas, propane & alcohol! The most rich is 12:1 and the =
most
lean was (is) 17:1. I could even see the O2 sensor heating up when I did
a cold start. The lites would lite up one by one till I had about 12:1
a/f mixture and in a few more minutes, the engine would go into closed
loop and the gauge would start bouncing up and down to achieve the =
stoich
mixture. I'm telling you, this little baby worked real good. At wot, w/o
the larger fuel pump, I would drop the lites (lean out) at about 16 lbs
of boost and 6500 rpm, with the larger pump, I could hold 20 psi till =
7500
rpm. This gauge saved my ass a few times.

Frank

-------------------

Steve Ravet
sravet at bangate.compaq.com
Baby you're a genius when it comes to cooking up some chili sauce...



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