I posted this on cobalt.com also, but I really want some info.

I want to find out more about the whole 'inhibited boost' issue in the 07's. My 07 will only hit 9.3 psi tops....and thats punching it in 1st, 2nd, and 3rd and having it floored til 6k. So its NOT me. A few guys on here said that the ECU doesn't allow full boost until 1400 miles...if any of you have some sort of proof of that, that would be great. I'm skeptical cause I've also heard a couple of 07 owners say they hit full boost the day they drove it home. I called a service tech for Chevy today and asked about it, and he said '8 psi sounded about right for those cars, and you have to take altitude and fuel quality into consideration'

So any of you 07 owners out there, I'd like to know how many miles are on your car, and what you are boosting.

 

I thought all the ss/sc's boosted around 12 stock no matter what year!

 

Well Im pretty sure my balt does way more then 9.3.... not exactly sure what it tops out at though

 

that is wierd. From day one i was getting full boost. i got my car with 39 miles on it

 

my balt when pushed hard does a little over 12

 

It took a little bit for mine to hit the full 12.5 lbs. Almost 5k miles to be exact. Now with my tune though, I hit 12.5 almost insantly in 2nd and third.

 

it should always hit 12 or 12.5 and if urs is only hitting 9.3(dont know how you came up with that number) then you should take it to ur dealer asap!!!maybe ur leaking boost or something or maybe it is a lemon lol!

 

I have already replaced 3 boost gauges for inop and inaccuracy! (on customers cars) The gauge in most likely defective.

 

im getting roughly over 12psi with 5500km on it

 

So are you saying that you didn't hit 12.5 til after you tuned it? What were you hitting before you got to full boost?

 

I came up with 9.3 cause I had to convert kpz to psi, and thats what it came up with, lol, sorry. Kinda weird

 

when I first got mine it only went up to 10psi, eventually it made it up to at least 12psi, guess it had to beak in.

 

has your car been boosting that the entire time you owned it?

 

What mileage were you at when you hit 12?

 

Is there any way that I can find out it its the gauge or not?

 

relax grasshopper the boost comes with time

great things come for those who are patient

 

You should be hitting right around 12-12.5psi @ full throttle, high rpm, in 2nd gear and up. If not the gauge is off. Also, when you turn on the ignition, without starting the engine, what is the reading on the gauge? It should be at 0. With the engine running at idle, the reading should be around 17-19inHg.

 

well i have 7000Km on my 07 and im boosting at about 80kpa or 11.6 psi. that is the max i can get it to. i am stock.

 

12.5 and i just hit 10k

 

There is no setting in the PCM that would control that. Unless there is something in the calibration we can't see with HPT.

 

I just heard that from a couple people on this site, so thats where I got that, I didn't know if it was true or not, but there were a few people that said it, not just one person.

 

Hey, it took a few thousand kilometers before I got full boost. Started at 60 kPh and now it's 80 kPh

 

thank you! I'm glad this happened with someone else....maybe its only with the cars made in Canada???

 

I'm like everybody else here I know my 05 hit atleast 12 pounds the day i drove it off the lot with 5 miles on it. Maybe there is a vaccum leak somewhere.

 

no slowly made its way up, started off around 9.5- 10 psi