View Single Post
911st 911st is offline
Registered User
Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Sorry if I implied 9/1 is ok. Nor would I run 9/1. That is way to rich.

However, many well running modified 930's do often dip into the 9's (high 9's). It is not desirable but even an adjustable WUR or Andial Fueler can only do so much.

It takes a D-WUR or modified WUR with rpm delayed boost clamp (the first done by Brent930 some 7 years ago at my suggestion) to try to over come this issue on a 930 that is flowing much, much more air than originally designed to.

Going to rich to fast is a function of where the metering plate sits in the metering cone. The metering plate moves quicker relative to changes in air flow at earlier rpm's. Lowering control pressure in an effort to get more fuel up top only exaggerates this.

I do think someone can build a 500chp CIS motor with mechanical WUR and stay in the 11's to red line with out a boost clamp but it will take some work to the metering assembly.

Last edited by 911st; 03-27-2010 at 05:31 PM..
Old 03-27-2010, 05:26 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #15 (permalink)