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Join Date: Dec 2006
Location: Germany
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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
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Old 12-16-2008, 12:13 PM
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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
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Old 12-16-2008, 05:32 PM
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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.
Old 12-16-2008, 06:24 PM
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Quote:
Originally Posted by Falk930 View Post
. . .2 buddys with 930s, using them on track told me they took out the WUR completely.
Would that rise control pressure and result in lean mixture?
or is it proportionally?
Falk
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.
Old 12-16-2008, 07:46 PM
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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
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Old 12-16-2008, 09:08 PM
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