True dual exhaust and O2 Sensors

[George M. Dailey]

At 11:14 AM 2/6/96 -0500, Nick Hagen  wrote:
>
>I'm exploring the possibility of changing from single to true dual exhaust on
>my late model Ford truck which appears to have the EEIV and MAF sensor
>(California). Do I need to install a second O2 sensor? Would this sensor be
>connected parallel to the original or does the EEIV have an input for a
>second sensor? I think many (most?) late model mustangs had true dual exhaust
>and the controllers are similar I would guess.
>
>
>
>I don't think you need a second o2 sensor because most V(8s or 6s) have the
sensor placed in only one manifold (from the factory). My '58 is V8 powered,
dual exhaust with crossover and one O2 vsensor. It's crossover is three feet
from the O2. True enough, your ecm will only correct for one side of the
motor. This does not seem to be a problem for the millions of Vs using a
single o2 sensor.  If you have a 'hurt me plenty' philosophy, you could
connect two sensors and send the AVERAGE voltage to the ecm. Don't even
think about wireing them together directly.  You will need some type of
analog circuit that will average the voltages. The circuit would need a very
high impedence since the 02 sensors generate low voltage at extremly low
currents.  There are other things to consider also. 

good luck.

GMD