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94 octane/e10 base map, e85 flex tuning

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Hi All,

I have an R33gtst with rb25det. My car performs double duty, it spends most of it's life on the streets and sees a track day every other month.

Recently I've been thinking about setting up the base map to run e10 (about 94 octane in Australia, our best pump fuel is 98 octane) with a flex sensor.

The idea being, I could run a 4 port boost solenoid and really low gate spring pressure, say 3 or 5 psi base. Then when the car is on e85, run full boost 20psi.

That way when I'm simply commuting to work for the week, the car would drive around essentially as an NA car making 3ish psi and I can trow e85 in it when I want to enjoy the drive.

My concerns are primarily around any risk of engine knock as I'm only running a Haltech Pro Plug in and I'm not happy with the knock control function of this ECU.

My main questions are, is this a crazy idea? should I not be a tight arse and run the base map on 98 octane like everyone else? (even though I'll just be cruising down the highway for my 100km round trip)

If this isn't a completely mad thought, any ideas on knock detection for the boat I'm in? Ideally I'd like to use the factory knock sensors.