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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
Originally Posted by T77911S View Post
raising the system pressure would lean it out reducing the fuel at hi RPM,, and across the band.
That's correct because hydraulic control pressure pushing down on the top of control plunger against the mechanical force of the air flow meter pushing up on it from the bottom will also increase as system pressure is increased.

Unless you make adjustments to compensate...

That's why you need an adjustable control pressure regulator when raising system pressure.
Then you can adjust and lower boost control pressure in order to keep the AFR from leaning out as system pressure is raised.

Overall CIS is complicated but all the sub assemblies that are working together are relatively simple.
A bunch of mechanical fuel pressure regulators all working with and against each other...
Old 11-18-2014, 09:28 AM
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