I'm not asking theory, you stated you tried it, I'm asking for the results. Because some gauges are strictly going off of lambda and converting to afr, so if it was showing 14.7 with nothing but e85 that means it worked.
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Hmm. I wonder why my stock tune for a 200 GTP with a return style fuel system sloped with manifold vacuum.
There are a couple theory's behind that.
-Gm didnt wire the car with heavy enough fuel pump wiring so they compensate for the weak pump in the tune (I don't honestly see this one considering people regularly add 50+ horsepower without the pump sagging)
-The bosch regulator isnt perfectly linear
I have tried sloped and flat line with my setup. Much better results with it flatlined *shrugs*