aslright well just a couple nights ago me and a friend were just messing around with my car and before this i was running at like 8 lbs and whet we did for some reason raised it up to 13lbs peak it was kinda cool and i havent thrown a check engine light yet so its kinda cool.

 

stock is supposed to be 12.1 i think

maybe u had to break it in

 

how did you raise it?

 

WEll there is a little alan screw right by the wastegate and if you screw it out it will raise it up and i hit 13 lbs on my gauge so

 

we dont have a wastegate just a bypass valve

 

adjust it back to stock

it's not good for the car to have higher boost at lower load compared to stock......it creates KR due to the inadequate fueling

 

yes put it back or you will have a blown cobalt thread

 

stock boost is 12.5 and you are so post break the car in.

 

agreed with these guys turn it back to stock because i was only running like 10 when i broke the car in i spiked at 12.5....

 

My car has hit 12.5 from the first day I pulled it off the showroom. Same thing with my friends 07 ss/sc. 13psi doesnt sound too high. Maybe it was just really cold when he saw 13psi.?

Mike

 

It's just the adjustment for the bypass valve . If it wasn't adjusted right from the factory it will bleed boost while at WOT . As long as you didn't back the hex screw off so far that it binds the bypass valve in the port it won't cause any issues .

Check and see (with the car off ) that when you open the Bypass valve by hand it doesnt have a spot that sticks and that it opens up without any restriction.

 

How the hell do you open the by-pass valve by hand... I've had my car for a year and a half and never heard of such a thing!

 

Guys,

If you notice he lives in Colorado so more than likely he's at a much higher altitude, which explains the 8 lbs of boost. Sea level is 12 like some of you stated.

I don't understand how he could have raised your boost pressure when all the bypass valve does is open and close. Opening it would make you lose pressure, closing it would just allow you to create pressure above atmospheric pressure but it's all still relative the speed of your compressor and air molecules.

It's possible he did something to how your boost gauge is reading your manifold pressure though.

In short, put it back to normal.

 

agreed^^^^

 

If the adjustment was off, the bypass valve could be partly open all the time thus bleeding boost . If he adjusted that to let the butterfly completely close then it could explain why it did what it did . A couple of techs told to me to check mine as they have seen them out of adjustment from the factory on GTP's . How is that going to hurt anything? If it's backed off too far then yes the butterfly can stick because it starts to bind in the port. As long as it opens and closes freely he's good to go .

With the car off you can easily work the butterfly on the bypass ,it's controlled by a vacuum module when the car is running .

 

He's talking about this thing.....I've adjusted mine but my SC was out of the car at the time.

 

Adam is 100% right. At high altitude, yu're not supposed to boost 13 PSI from the stock 3.34" pulley ! I'm boosting 15 PSI at high altitude from a 2,6" one.

Maybe it's funny for the time being, but watch if your cat isn't clogged or something like that.

 

I was in Colorado springs........I think I was boostin like 10-10.5.....but the balt was new

 

wow guys everyone is telling me to put it back well i have had it done for a while now nothing is wrong and its all good i adjusted the hex bolt down some so its not all the way out and now im right at 12 lbs so pretty much all stock but nothing is hurt so its cool. PLUS my buddy is a know it all about superchargers so i will trust him over anyone so its all good you guys THINK you know but thanks

 

Yes, your buddy knows everything.

He's tuned countless Cobalt's, messed with every supercharger in the world, and can build one out of basic kitchen utensils.

Each car is different. One car will react differently to a change then another. That's why I wouldn't send my Saab to a 'turbo specialist', because they would mess everything up. I'd send it to a Saab specialist.

 

do i smell something?

 

If you trust him over anyone else, then why did you make this thread in the first place?

 

To brag of course, and tell everyone how simple it is to manually increase your boost. Dude, his friend knows EVERYTHING about superchargers. I'm heading out to the garage to do it right now!

 

ROFL of course

but honestly, he literally can't increase the amount of air pressure inside the manifold unless the supercharger is turning faster (hence, he'd need a new pulley that is smaller). His friend fucked with boost sensor reading. That's all.

 

::slams head into desk::