ox sensor on sequential efi,high overlap cam.... a bit lo

[Tom Sharpe]

Jemison Richard wrote:

> The WWII FI birds (which often had some pretty wild camming to get the power
> required) and supercharging, EGT was the indicator of choice for mixture
> control but no one worried about it til you got up and pretty well
> stabilized in cruise (or for the multiengine planes with a flight engineer,
> had the engine up in the power range).   The wild cam basically says the
> designer (and the user) don't really care about low end quality and are
> willing to sacrifice it for upper rpm maximization of HP!
>
> Lets try to little mental game playing here.  First assume it is possible to
> control mixture with high overlap and low rpm.
> If the engine is really setup well and the cam isn't too wild, you can
> usually get them to idle fairly well.  The secret to getting efi to really
> control A/F under these circumstances would be to at least get the engine to
> stumble and blow raw fuel into the exhaust fairly consistently.  If the
> anomalies approaches any type of periodicity, then you can predict the next
> event with a definable level of certainty (and write code to correct for
> it).
>

My Edelbrock idles well when the idle adjustment process is turned off. It
obviously has the wrong code and processor. When tuned by the book, the "blower
roll" will spin the tires (against the breaks) and then stall.  Regards  Tom