I'm sorry i didn't know your words were the Gospel.

I'm a smart ass and i cant turn it off.
This is a forum, your words will be questioned thats how discussions happen ..ill try to be less abrasive form this point.

yes less timing will mean more boost,but more heat doesn't necessarily mean more boost (that is were my confusing came from)
My IC has failed on me twice each time i didn't notice a significant increase of boost ...not 6.5psi Worth anyway.

Id have to imagine the car would feel like a turd if that was the case. my car loss 4-5mph in the trap when my IC died a difference that can defiantly be felt in the but dyno.


Op. was that stage 2 Just added ? or have you had SII

 

yeah i wasnt meaing thay hot air is denser lol. I understand about being a smart ass i am one myself lol.

 

check the lines on your bypass valve. i switchwed mine one day and it ran like that. it would peg the boost gauge but run like crap. switched em and bam problem fixed. sounds like you have em backwards.

 

If he's on the stage tune, and it was high IAT2s from a dead pump, the car would be pulling boost (as a safety measure).

 

Whether the pump is working or not doesn't solve his issue. It's a restriction somewhere in the exhaust system, I would guess the muffler if that is the only thing on the car besides open piping. Simply take the muffler off, or the entire section near the axle and run it real quick. Yes the car will be stupid loud but I doubt you will see much over 15lbs. If that is the case, simply buy a new muffler. My vote is for the dynomax super turbo.

 

ok MY POINT ( If he is tuned by say me or some one else i raise the iat2s up to 217 and make the iat2 percentage boost rate 50% so therefore it will lose boost but in alot of cases heat soak wil do this. In the instance of the car having to much boost, it can be what i said beforfe, restriction, timing issue from heat, ect, its all unknown because we need to see a vid of it, and the OP needs to diag himself for us to help.))))))

 

update....i checked my compresstion
cly1-180
cly2-170
cly3-170
cly4-170

narrow band voltage was between .87-.9 at wot.....so i thinkn im just pig rich

 

yeah its rich but for wut reason, tune is off, its running to hot iat2s, kr, ect, there could be alot of reasons, even a restriction can do this.

 

Stage 2 is pig rich...

 

This. 3" pulley that peaks around 14psi on a 5*F day.

 

yea its the stock gm stage 2 pully though...

 

you need to diag the car, weve given you are thoughts, take your catback off and see if the boost goes away if so you have a restriction, if it stays there then make sure your gauge is not bad. and ect.

 

I rode in his car the other day. It just feels like its not pulling and just falling on its face. I've ran him and pulled a car on him, im pretty sure that it should be the other way around.

 

Be careful about doing this because there is nothing left to brace the down pipe (DP) but where it's connected to the header. If you still had a stock DP (which you don't Chevycobaltss3) but for other member's who may try this, your DP will bust and cause a leak at the flex-pipe.

Believe me you don't have to go far to do this either. I went a total of 2 miles one day before my flex-pipe broke and almost left half of my DP laying in the road. Good thing I had planned on buying a new DP anyway. It sure sounded like a wide open race car going down the highway though. Not cool, sounded like crap for a Cobalt. Anyways I'm quite happy now with my Hahn's shorty header, DP and 3" cat-back exhaust system.

Good luck in finding the obstruction or current problem that's messing up your boost. If it was any other tune besides GM I'd say you needed to talk to the tuner again and see what adjustments they made but GM doesn't normally let it boost that high even with a Stage 2 tune.

 

Definitely sounds like a clog somewhere in the exhaust system...

 

Well im hoping OP doesnt drive the car like that more then a few mins, i mean really you had to make a post that had MY name in it!!!!!! I AM BY FAR A VERY VERY VERY GOOD DIAG TECH, and have along history of fixing cars no one could figure out . With him taking the catback off and running the car for a couple mins letting him get into boost this would tell him if he had a clog somewhere in the exaust.Also he is catless so this will tell him if the obstruction is in the catback. But also he could be pullling a ton of timing and making him so retarted that bost has no where to go... An i am meaning your car OP not you lol

 

Sorry man I wasn't trying to say anything bad about you as a tech or what you had suggested that he do to diagnose the problem. I was just hoping that he wouldn't get the wrong idea and try driving around with the cat-back off. I know that you didn't suggest for him to do this but I wanted to make sure he as well as others know that driving around with the cat-back off is not something good to do.

Sorry for the misunderstanding

 

Removing the catback will do zero harm to the car. I would crack a window and turn the HVAC on for good measure, though.

 

U r fine bro..... Sorry for misunderstanding bro lol

 

Check the flex pipe on the down pipe.it may have collapsed.

 

OK, then remove your catback and drive around for a while, but don't come crying on the forum when your DP busts at the cheaply made flex-pipe section (if you still have your stock DP on). Your trying to tell a person who knows this from experience. I only drove less than a mile to the parts store and straight back to the house and because their is nothing bracing the DP (it's just bolted to the header) it started to crack at one of the seams. Then I had a leak of course that made a horrible noise even worse than having no muffler while driving around until my new DP was delivered.

Now do you want to say removing the catback will do zero harm? Yes, removing it will not harm anything but revving the engine and driving it with no catback attached will do some harm.

I think even Charlie Sheen would gladly give you a Face Palm for making that statement...

 

I think ops cars a catless down pipe so it wont have the issue as the stock flexpipe would but what he should do is only drive the car for a min of 5 min just because of. The issue of sucking cooler air in the combustion chamber on a decel because it can cause a burnt valve and valve warpage.

 

Ohhh.. maybe you got one of the zzp downpipes/flexes that collapsed... (anybody else remember the pictures of that, where the flex collapsed down to about 1" in diameter on the inside?)

 

yeah but i hope this guy got the revised one lol

 

Then you're an idiot for leaving the pipe hanging from the flex joint and not using a wire hanger to support the section like any moron with half a brain would have done.

And again, revving the engine with no catback will do nothing but make a lot of racket and **** off everyone around you.