K-Jet /PIC hybrid

[Orin]

> > My guess would be that the plate would be as high as it goes most of
> > the time at the Audi Q power levels and fuel would be controlled
> > by the pressure difference across the metering slit, not the size
> > of the slit - ie by the 'lambda' frequency valve (which incidently
> > is used in the UK quattros which _don't_ feature an O2 sensor).
> 
> > Note that K-lambda was used in Audi 5-cyl turbo engines up to
> > 1991 models at least (Canada and non-quattro US that I know of).
> 
> You're mostly correct, but not entirely. The WR and GV (147kW)
> engines produced from 1980 to 1987 didn't have the "frequency" valve
> at all.  The MB successor to those engines had an external fuel
> pressure regulator and damper bolted on the side (where you'd expect
> a frequency valve) with what looks like manifold-pressure sensing.
> Still no fuel injection electronics!

The MB, UK version at least is an MC without O2 sensor.  It uses 
the MAC12 ECU.  The MAC12 code is very similar to the MAC11, but
the frequency valve is driven by a table, rather than the lambda
code in the MAC11 ECU of the MC.

Orin.
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