[Diy_efi] idle control strategy for SD systems w/o bypass

[socrace at ameritech.net]

    There's another method that I've been using for awhile that stabilizes 
idle rpm pretty well with or without an air motor.
    The method can be simply stated as follows: as idle rpm drops, richen 
the mixture in direct proportion to the rpm drop. As rpm rises, lean the 
mixture by the same rule.
    This works because an idling motor is (usually) pulling air at Mach 1 
through the throttle system. This means that air mass entering the manifold 
per unit of time cannot change, so the mixture changes with rpm.
    I believe this is the main reason that an idling engine will stall so 
easily with a sudden load change, as the rpm drops it just runs leaner and 
leaner.
    I used this method to stabilize the idle on my Edelbrock Pro-Flo, a 
typical heat soak "blower roll" idler.
Bob D

On Mon, 26 Aug 2002 07:45:41, you wrote:
 >Vary the ignition timing.
 >If man built it, man can crack it.
 >BobR. 


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