[Diy_efi] The Hunt effect

[Adam Wade]

--- John Gross <jogross3 at hotmail.com> wrote:

> the flame front speed does NOT change with higher
> octane,

Does in pump gas, due to all the other restrictions
that must be met.  Race gas?  Big difference.

> if the engine has a high enough CR that it cannot
> attain MBT timing on lower octane, you would find a
> power increase with higher octane from the simple
> fact that the ECU can put full ignition timing in
> the motor.  This would be found ONLY under WOT
> conditions, not part throttle.

How so?  Unless the ignition system does not advance
the spark to try and achieve MBT under part-throttle
conditions, there would be an effect at any throttle opening.

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