Air/fuel ratio monitors

[alan pritchard]

what a coincidence, id read that article on scirocco.org. and planned my own
a/f meter,  ive drawn up a housing, which incorporates the 10 leds in a 3/4
circle fashion, the brightness is controlled via a photoresistor.  under the
perspex front cover is another cover which gives access to some dipswitches,
each switch is assigned to an led, and if switched on, when that led is
active can switch a relay, to control another device (specifically the 6th
injector on cis). the unit is designed to mount through the dash, although i
may revise it, the electronics are fairly simple, based on a bar graph
driver.
this unit is being designed for my future modifications, but if there is
much call, i may be able to produce them for others, again, any suggestions
would be greatly appreciated.
also my next plan is to produce a digital boost gauge in an identical
housing, although i havent researched this yet.
ill find somewhere to post my assembly drawings/renderings, or if you want,
ill email them direct.
----- Original Message -----
From: "Andrew Buc" <abuc at attglobal.net>
To: "Quattro List" <quattro at audifans.com>
Sent: Saturday, November 10, 2001 3:16 AM
Subject: Air/fuel ratio monitors


> The following from the Peugeot listserver. (N9TE is a Peugeot-specific
> reference.)
>
> Those of you living on the edge with your Turbo etc. really need to
> monitor your Air/Fuel ratio (AFR). There are devices on the market for
> $50-2000. You can make your own for <$20. See:
>
> http://www.scirocco.org/tech/misc/afgauge/af.html
> http://www.autospeed.com/A_0828/page1.html
> http://www.altronics.com.au/cat.asp?cat=11&grp=430&id=K+4347
> http://www.jaycar.com.au/kitsgrown.htm
>
> The Jaycar is the best buy. As this is a simple voltage comparator/LED
> driver affair, you could do a lot more with it than AFR. You could make
> a digital boost meter (DBR) for example. The DBR could also be set up
> to trigger actions based upon boost level. One thought might be to fire
> the N9TE Cold Start injector at some high boost level.
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