effect of CAT on WBO2 readings?

[Mos]

A lot (in certain circumstances).

"What the catalyst essentially ends up doing (the 3-way type) is taking
the leftover O2 from lean cycles (which may be present as free oxygen, or
as NOx), and combining it with leftover HC/CO from rich cycles. The net
result being CO2, N2 and H2O, none of which is considered an emissions
gas." - C.C.

In other words, after the cat, you'll get an average, where before the cat
you get the instantaneous.

HTH.
Mos.

On Fri, 1 Mar 2002, rob files wrote:

> Hi all,
> 
> How much (if at all) will a WB measurement change if the sensor is placed 
> post cat (tailpipe probe), as opposed to pre cat (header bung)?
> 
> Thanks,
> Rob

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