[betasniper]

In my opinion, 2/3 throttle is far to much throttle because that would almost always put you at atmospheric pressure. I have a vacuum gauge in the wagon and barely 1/4 throttle (estimated) would cause the vacuum reading to be 5"vac at low rpms and anything past 1/3 (estimated) results in 0"vac. The MAP is not linear with throttle position.

Edit: It would be interesting if you have a SG or UG to see both TPS and MAP on the same screen to see what the correlation is.