does any mod...

[Orin Eman]

> Now the ECU takes info from the O2 sensor and adjusts the mixture really 
> thru the air-flow sensor plate. This is done by the CIS freq. valve 
> adjusting the fuel pressure which sits on the plunger which is attached to 
> the air-flow sensor plate. This adjustment of pressure atop the plunger 
> adjusts how easily the air-flow sensor plate is able to move. If you take 

Please read Probst's "Bosch Fuel Injection and Engine Management"
section 5.2.  The pressure on top of the plunger is controlled
by the 'control pressure regulator', aka warmup regulator.
The frequency valve controls pressure difference across the
metering slit.

> whatever is metered by the air-flow through the sensor. So the ECU will not 
> limit the movement of the air-flow sensor plate beyond 1.4 bar, it will 
> continue to compare to the o2 sensor readings and shoot for the stoich A/F 

The ECU doesn't care about o2 sensor readings for manifold pressure
above around 1.1 bar (RPM dependent).  It goes open loop regardless
of the WOT switch.  (Loss of performance due to the WOT switch
failing is due to the ECU not controlling boost, not fuel issues,
unless you are below the 1.1 bar or so level.)

> In a modified vehicle, at 1.4 or 1.6 bar the A/F ratio should still shoot 
> for the stoich 14.7:1 ratio. The WOT switch allows for a richer mixture not 

Not.  See above.

Orin.