system/control pressure function?
 

hmm, have some screws in brain today...

Fuel heads lower chamber pressure ( control pressure)
regulates system pressure to injectors.
Rising control pressure leans out mixture?

why I ask:
2 buddys with 930s, using them on track
told me they took out the WUR completly.
Would that rise control pressure and result
in lean mixture?

or is it proportionally?


Falk

Less control pressure more fuel, more control pressure less fuel. Without a WUR the on boost enrichment will not work causing a lean condition.

Dan

Falk, are the two guys you refer to using some other method to enrich the mixture while under boost? They must be, otherwise I can't imagine running without the WUR.

Removing WUR would raise "control pressure" to the fuel head's supply pressure, stock being 6.5 bar for most year models.
Mixture would be so lean, the engine would not start.
One can eliminate the WUR only if alternate means of varying control pressure to the CIS is applied.

hello,

thanks for help. I wstill drive.as wondering how their cars
I remember now, they have a manual fuel pressure regulator.
I took me so much time to at least one of them let buy a wbo2.

Falk