AFR calc from Diacom data... was RE: Adding another O2 sensor

[Bruce Plecan]

> Well, the fuel economy recently slightly decreased with the headers, but
the
> calc'd AFR at 12.5:1 is traceable to day 1.  Last night, on the 30 minute
> ride home, coolant temps were up over 180.  It was a little warmer here
> yesterday.  The computer reads the sensor in the front of the intake
> manifold, right? (TPI V-8)
> So, the enrichment mode setting at 175deg, is that the whole story behind
> the aftermarket chips and their 160 deg stat requirement?  Just to fool
the
> computer into richening the mixture?

By golly he's got it!.
Also, on some cals, a little more spark,
Some cals, defeats EGR.

> Need to get the high speed link going.  As anyone encountered wiring
> problems causing differing O2 readings?  I'm considering running a
dedicated
> ground from the O2 case to the ECM.  Bad idea?

Might just a 3 wire, and cover all bases at once.
The Bosch O2s had an internal geound problem for a while.


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