Air/fuel ratio monitors

[Andrew Buc]

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.