For any of you guys that are 2bar, actually even 1bar. When tuning what MAP reading do you get with the engine off? This reading should very with elevation as does pressure. I am just trying to figure something out, I seem to usually see 96-97kpa. I would like to assume that sea level would read 101.3kpa but need your help to confirm. How about you guys in CO or anywhere else higher up? Elevation at my house is about 1200ft.

So- 1200ft/96kpa

 

Found this, it backs up what I am finding and thinking.

Atmospheric Pressure (kPa) = 101.56 – (0.0113 * Elevation (m))
From the above formula you can see that as a rule of thumb, the
atmospheric pressure decreases by approximately 1 kPa for each 100
meters of elevation rise above sea level.


The reason is that my boost gauge reads about .5lb more then my scanner in HPT. However, lets say I have a max KPA of 170 after a wide open pull. 170kpa = 9.98psi however my boost gauge will show 10.5psi (Roughly, hard to tell exactly) Anyway off of the above formula for my elevation I would subtract 4.1kpa from my start point. My 0 is not 101.3 but rather 97.2kpa. This means my actual MAP if I want to find out boost based on my scanner is 170+2.8= 172.8kpa or 10.4psi