[Diy_efi] WBO2 and AFR

[Jay Wallace]

At 04:54 PM 06-07-05, you wrote:
>What happens in this scenario when you add a turbo upstream of the WB02
>sensor?  Does the turbo muck up the partial pressures at all, or are
>they pretty constant pre- and post-turbo?

This seems to be very interesting and important question - if the exhaust 
backpressure at the sensor goes up by, say, a factor of 2 then the oxygen 
partial pressure would also increase by a factor of 2 without ANY other 
combustion changes occurring. The obvious way to correct for this is to 
simultaneously measure the exhaust pressure at the WBO2 sensor and divide 
the oxygen partial pressure by the total pressure, giving you the fraction 
of oxygen (pressure basis) in the exhaust stream. Or am I missing something 
obvious here?

Jay