Does anyone have any information on the Stock RX-8 Intake system?
(6 Port Engine).Such as when the valves that vary the length of
the intake system open or close and how these are controlled, I
am assuming the computer normally does this just how it does it,
eg pulsed signal or simply powers them on,  In my application I
do not need to replace the intake system, we have sufficient
space, however I'm using one of Tracy's EC-3 and EM-3 Computer
systems, it would be nice to be able to control the valves to
some extent to maybe optimize the intake air flow to something
that would provide better power & fuel economy based on the
engine RPM.

I thought that maybe a simple trigger system might be a fair
compromise to do this using the approximate points that Mazda
uses to vary the manifold length in a similar way that they do.

Any thoughts on doing this?

Regards David

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Yes I do David. Here it is. This is for the six port high power version.
I do not have anything for the four port low power version.
Most valves are controlled by vacuum except the sleeve valves inside
the end housings are controlled by an electric motor.

Paul Lamar