Okay I would like this thread to help some people out, including myself. I would like those of us with pulleys, tunes etc to post our boost #s with our combinations to answer alot of the "What do you get for boost." I suggest we post our maximum boost at whatever point you shift at. Also, if you know your elevation, lets throw that in there too.
I guess I will start.

Pulley: 2.9
Max Boost: 15psi @ 6800rpm; Shows just over 100KPA on gauge.
Elevation: 1640 ft.
Stage 2, Injen and HPT tuning.

 

pulley: 2.85
max boost : 16psi at 7k
stage 1 and air box mod

 

stage 2 w/ 2.9
exhaust
CAI
Boost PSI: 15-16
Boost KPa: 105-115

 

12.5

 

2.8
17.5 @ 7200
1.16 kpa.

 

20@6500rpm

 

What is done to your car!? I almost want to call bs...

 

2.6
18@7000
close to sea level
mods in sig

 

o yea...

15 psi

 

2.6'' pulley and just cat-back
switching back to stage 3 pcm and 2.9'' pulley tomorrow, then 17.5psi @7000rpm

 

and thats not near redline

 

Okay, I don't know why my car is boosting so high, maybe the stock guage is off. I know some of you will want to call bs on it, but I take it out and try get my friend to take a pic of the guage when am driving.

I'm running, Stg 2, KN Intake, GMPP Exhaust.
4th gear I have seen it between 115 - 120 kpa...

110 kpa = almost 16 psi
115 kpa = 16.7 psi
120 kpa = 17.4 psi

Don't ask me, I swear this is what I have been seeing though.

 

2.7 and 17 psi

7200 @sea level(ish)

 

This is really good, keep'em coming, dont forget your RPM and altitude if you know it.

 

Stock pulley and injectors. AEM cold Air intake and am hitting the line right before 15 lbs (13.75?) at about 6000-6500 rpm. Elevation in Fl...10ft above seal level.

 

I have seen quite difference depending on what the outside air temps have been. Here are some of the readings I have seen since buying the car in July 2006.

Stage 1 installed in the fall, and Stage 2 upgrade this spring.

All at redline or there abouts, and about 2-3 hundred feet above sea level...

Bone stock 12-12.5 psi
Stage 1 stock pulley 15ish psi (around 5* out)
Stage 2 pulley (3.06") 16 psi+ temps around 35*
Stage 2 pulley 15 psi mabye a touch more, most of the summer
Stage 3 pulley (2.99") 16+/- psi yesterday temps in the 60's

 

Was using a 2.85" which when I put it on last december was good for 18 psi.....but this summer (99 degrees outside) put out around 14 psi.....now that I'm back to stage 2 pulley right now 12 psi when winter rolls back around I expect 15 psi which I had last fall and winter.....

 

stage 3 pulley
16.75psi @ 6800ish
elevation around 800ft

 

22psi normally (2.5", CAI, full exhaust)
18psi lately (2.8". CAI, full exhaust)

 

15psi @7500 rpms
Mods in sig

 

8lbs of vacuum lol not

ryan.

 

I'd be scared for my car to put out 22 pounds on the Eaton. Seen and heard too many bad stories.

Also, is your car the SS that is on youtube "Cobalt SS on 20's??" If not sure as hell looks like it. :

 

12.5@5000
2.9
stg 2
4600ft

 

I hear you...22psi had me shittin my pants. I turned the boost down after I noticed it. I have a 2.8 on there now.
That is my car....

 

I figured. lol.

Yea, I'm just gonna go with 2.9 and 42.5 lb injectors. I don't want to risk anything plus I'm not looking to be one of those guys who has a car that puts out huge amounts of boost anyway. Makes things not so fun cause there is no competition.