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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Originally Posted by jsveb View Post
... Please tell me why switching the WUR is not a simple task?...
Swiching is, getting it to work may not be.

The WUR is basically a pressure regulator. As such they operate at a given pressure that works to offset the forces of air flow about the metering plate and how far and fast it opens.

If the 930 WUR operates at the same basic control pressures (except on boost) as the SC's it will run correctly. If not it may not run at all. This would require it to be made adjustable such that it could operate in the needed pressure ranges. Cold, hot, and on boost.

Someone needs to look up the specs of the SC and 930 WUR being used to see if they are even close. I forget but I think the 930's are significantly higher.

Another way to get enrichment with the SC WUR would be to bleed off control pressure using a frequency valve and an additional injector controller. It works quite well and makes the CIS very tunable by rpm and load. Or, there is an aftermarket tunable electronic WUR that sould be a great / best soulition.
Old 04-07-2013, 07:49 AM
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