homemade air/fuel gauge...

[Eric]

I built a DIY-WB from
http://www.techedge.com.au/vehicle/wbo2/default.htm last year.  They
have gotten more advanced since then with data logging and the board
layout is easier.  Plus you can get it prebuilt if you want.  I have
mine installed on my EFI race rabbit and it work great.  It takes about
20 seconds before it heats up, but then works great.  My only complaint
which has already been fixed with the latest ones is that you have to
run an alternator because it is not very happy below 13.5 volts.  Of
course that is not a problem for street cars.

The guy that runs it is very helpful and also has forums if you have
questions.  All prices are in AU$ which when I got mine made it very
affordable.  I think shipping was $10 and took about 10 business days.

In short I love it and it will reside in my 4kq as soon as the KH is in
it so I can keep an eye on things.

Eric Sanborn



Richard J Lebens wrote:

>Take a look at http://www.diy-wb.com/info.htm .  It uses a two cell
>sensor.  Build it and tell us if it works ok.  They says it will work
>from 20:1 to 10:1.
>
>
>--- JShadzi at aol.com wrote:
>
>
>>Ti, I agree, an O2 gauge is a very good tuning device, not as
>>accurate as say a WB sensor, but any standard O2 will give you a very
>>accurate reference to Stoich.  Typically I can get a/f ratio on an
>>034efi unit to within 5% of ideal using a standard O2, then fine tune
>>it up with a WB, especially WOT where 12:1 to 13:1 mixtures are not
>>as accurate with a standard O2.
>>
>>Luke, Ti is right, you can get a nice O2 gauge from Summit for under
>>$30, why use a multimeter?  Multimeters don't react quickly enough to
>>the rapidly changing voltage signal, its just not going to give you
>>any useful information, even if its free.
>>
>>HTH,
>>Javad
>>
>>
>>>The white wires are for the heating element.  The black wire is
>>>the output of the sensor.  The ground is the engine block.
>>>Having said that, using a multimeter as a fuel/air gauge during
>>>closed loop operation is going to be useless.  The signal varies
>>>much too fast for most meters to register a correct reading.
>>>
>>>-Ti
>>>2003 A4 1.8T multitronic
>>>2001 S4 biturbo 6-sp
>>>1984 5000S turbo
>>>1980 4000 2.0 5-sp
>>>--
>>>   ///  Ti Kan                Vorsprung durch Technik
>>>  ///   AMB Laboratories, Sunnyvale, CA. USA
>>> ///    ti at amb.org
>>>//////  http://www.amb.org/ti/
>>>///
>>>
>>>
>>>
>>>
>
>
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