: 9 psi

2012 CTS-V
04-25-12, 10:20 PM
Hey guys so my V sedan is fairly new (2 months old) and when I usually drive fast I look at the speedomter or the rpm gauge. Today, for the first time I looked at the boost gauge and it read 9 psi as I was at full throttle. It is 50 degrees Fahrenheit outside. Would you guys say 9 psi is normal, good, or bad for a stock V?

04-25-12, 10:43 PM
Good reading as long as the gauge isn't wrong.

04-25-12, 11:31 PM
How many miles? And 9 psi is correct. With a pulley, you'll hit 12 psi on the gauge.

04-26-12, 01:25 AM
Mine reads where I marked the red line. So it's marked by increments of 3. I guess 9 psi is normal then.


04-26-12, 01:45 AM
As I understand it, 9psi is factory normal. Smaller pullies = higher PSI. Your car is spot on. :bouncy:

2012 CTS-V
04-26-12, 07:22 AM
Glad to hear. 3k

04-29-12, 07:13 PM
Ok, so I was out zipping around a little today and I'm hitting about 8 psi. Dammit, if I'm short a pound, I want it! Any need for taking it in for this or does location matter? Central Florida isn't known for the best air for cars. Ideas guys?

04-29-12, 07:21 PM
I wouldn't put that much faith in the gauge :) I actually lost boost when I put headers on....but then the pulley helped get that back!

04-29-12, 08:15 PM
It's a gauge not an "instrument"....

04-29-12, 08:45 PM
Yeah, as is sometimes the case, I guess but I'd feel better if it was at 9!

04-29-12, 09:59 PM
I haven't really beaten on my V yet, at least enough to see the psi gauge at full throttle, but I wouldn't worry about minor variations in the reading. My Z was showing around 9ish psi on the gauge and I was stressing out, but it was hot out. But when it cooled off early one morning I went on a full throttle 2-4 gear run on a perfect stretch of deserted road and it was showing a solid 10.5psi (stock on ZR1) and possibly a touch over that. So, it seems ambient temperatures and other atmospheric conditions can 'slightly' affect the reading.