boost gauge source

One must be gauge pressure and the other absolute pressure, which will be different by 1 bar.

so oem shows relatively pressure ?

You have to select the one you want and based on my 2009 Cobb choices, I have "Manifold Absolute Pressure" and "Manifold Relative Pressure (Sea Level)," but I have seen it presented in many different ways.

ok thx

kholdstare said:

so oem shows relatively pressure ?

Click to expand...

It allows you to log both

hm i'm still unsure if i got it right.

both gauges shows 0 without engine running, in idle around -0.7bar.

so the r35 has around 2bar absolute pressure and 1bar relative to athmosperic pressure? as for my understanding that would mean without engine running the oem gauge should show 1bar while the DEFI gauge is zero.

Post a log at idle and snap a picture of the gauge at idle