2009-2013 Cadillac CTS-V Performance Mods Discussion, Stock boost pressure with Airaid in Cadillac CTS-V Series Forum - 2009-2013; What boost pressure are you guys seeing on stock cars with just an Airaid CAI? I saw 10 psi with ...
What boost pressure are you guys seeing on stock cars with just an Airaid CAI? I saw 10 psi with the Airaid Dry filter but after installing the Green filter (brand new) I'm only seeing 8.5 - 9 psi. Surprised to see this considering the fact that the green filter should flow more than the dry filter.
Boost pressure is actually a measurement of resistance: the blower is generally going to move a constant volume of air at a given RPM and air density (ie altitude, temp, humidity) under full throttle; with the boost pressure being determined by the efficiency of the blower and the cylinder heads (and cam timing, etc). What you see as "boost" is of course air stacking up inbetween the blower rotors and the cylinders - which is in reality a measurement of air resistance to flow: it is a handy reference point but is not specifically an indicator of power output, though people often make generalities associating the two in engine systems that share many of the same design parameters.
Changing the intake ducting alone should have zero bearing on Boost levels. Porting the blower, modifying pullies (ie the RPM of the blower), reworking the cylinder heads or changing a cam will all effect boost.
I'd wager that there is something else contributing to your perception of lower boost levels.