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kellcats521 kellcats521 is offline
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Join Date: Feb 2005
Location: Atlanta Metro
Posts: 219
Originally Posted by h20cooled7 View Post
is this used just for controling detonation under boost?
If you've worked on CIS VW motors, you're familiar with the warm up regulator (WUR). It is generally still called a WUR on the 930, but that really is a misnomer - it IS a control pressure regulator on the 930, as it works during NORMAL operation of the CIS system in the 930, not only during warm up.

To answer your question - Yes - sort of. The beauty of the 930 WUR is that it responds DIRECTLY to boost and it has some (limited) variability in controlling fuel. As boost rises, the pressure activates a control in the WUR which impedes fuel return - this increases pressure in the fuel system and thereby increases the amount of fuel delivered to the motor. The limited variability is this - the WUR control is basically an on-off switch - it has a 'bit' of 'slightly on' control, but for the most part, once it sees enough boost it effectively opens the floodgate. Modifying the WUR to make it adjustable allows for the ability to control how big the floodgate is (also limited by the fuel head, lines, injectors, pumps), and a delay control was also developed (by B. Lasek) to allow the floodgate to open later.

The Andial kit controls the same system - fuel RETURN. I really haven't jumped into the actual control circuitry, but it appears to only use RPM as a trigger to limit fuel return. I'm pretty sure it is not tapped into the boost sending unit, which is the only way it could use boost as a trigger.

Pat K
87 930
Old 02-05-2008, 09:19 AM
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