ahendrickson

So I just installed the AEM Tru-Boost gauge in my X. I plugged in my AP and went to the live monitor setting just to compare the results to the gauge. When the car is ideling, the Cobb reads -9 psi or so, while the gauge is reading -17 or so. Also, when I go full throttle, the Cobb always seems to read a little bit higher boost than the gauge. Which on is more accurate?

The way I ran the AEM is I T'ed off the line running from the manifold which then turns into a hardline and runs back to the firewall. Did I install it in a bad place? Thanks in advance.

Kracka

iTrader: (49)

The AP reads directly from the ECU which gets it's data from the 3.3 bar MAP sensor mounted directly to the intake manifold, this is the boost number I trust. They are reading vacuum differently though (your gauge reads it in in/Hg) so that's a fine # to look at even though it really doesn't mean anything for you.

ahendrickson

Ahh, makes sense. So should I use the AP when tunning the EBC portion of the AEM, or is the gauge fine to use, you think?

Kracka

iTrader: (49)

Never hurts to go by whichever reads higher just as a little safety margin.