air-fuel and knock

[Robert Deis]

Aftermarket Air-fuel gauges are generally not precise enough.  You're 
really only interested in a narrow range of voltage (.7-.9, and most 
importantly .82-.89) coming out of hte sensor, but most of the 
blinky-light gauges read in from 0-1 in .1v increments.

I find mine useful as a general indicator of what the ECU is thinking, 
but wouldn't trust it to set a mixture.

In general, most stock O2 sensors aren't precise enough either-- the ECU 
has trim settings it uses to learn and deal with variances in the 
sensors.  To really tune with an o2 sensor you want a wide-band sensor 
and digital volt meter.

There is a knock monitor product out there that conditions the signal 
into something human-readable- I forget the name, but I think it was 
made by one of hte aftermarket ECU companies. Try searching the 
archives- I may have found out about it here.

On Wednesday, August 11, 2004, at 12:56 PM, Nick Lawrence wrote:

> Intended vehicle is 5cyl Audi, either NA or turbo.
>
> Does anyone have any experience with add on air-fuel ratio gauges, such 
> as autometer, edelbrock, s-w?
> Are they accurate enough to be safe?
>
> Is there any way to monitor knock sensor activity? Besides waiting for 
> a stored code.
>
> Nick
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