My guess is that less advance is possible with 85 before knock detection backs off the timing as needed? I don't know exactly the inner workings of the PCM'* logic, I just try to figure it out based on my observations.

The MAF'* findings are an aspect of the PCM'* decisions on fueling, I get that, but engine loading and timing advance etc. are variable outside of just MAF readings. I think of it the same as a lot of performance engines today that advertise X horsepower on premium but they run fine on lower grades of fuel, just with less power.

My timing advance observations were at the same altitude, car, speed, RPM, time of day, and almost the same temperature with the difference being the fuel. Not just 91 then 85 but 91 then 85 then 91 again then 85 again. I couldn't think of a better way to confirm it (except to cycle a few more times but it snowed about then, changing speed, time of day, and temperature).

I think in your case all you need is a 50 HP shot of N02.
That'* only activated at full throttle.
Run 91 with is and only use it when you really need it.
Get a couple big bottles tie them together
And with a remote bottle opener.
Here comes the fast and furious Buick LeSabre

Bye bye trans

That would kill the trans in no time, I think he was joking though.

LOL I'd probably get two or three shots before pieces come out on the ground.

Yes take * few shots like two or three with a beer chaser.

My car never mixes its drinks.

NO E85 for the car just a few shots of JACK and COKE ?

Only when I want to clean the injectors.

So seriously, moving somewhat back on course:

- Suggestions on what kind of turbo would I use to have this engine make 400HP or somesuch?

- Then can I set it to wastegate at 14.7PSI total pressure, therefore zero boost at sea level and just enough boost at higher altitudes to keep my engine at sea level?

400HP turbo only tasked with keeping me at sea level computes as a turbo that will last forever in my book.