Sooo. ive had my SS for 2 weeks now and i have over 1200 miles on it.. i drive wayy to much. Im new to american cars...well tuner style american cars. i have a 1969 corvette stingray that ive nearly restored... enough about that.

i know about flowmaster, magnaflow, k&n, and some other brands but im not to informed on parts. i want to mod my ca and i need some opinions so can some1 fill me in please.

 

Well there is not too much out there as of now with the SS Cobalts.....

This is what I plan on doing: Cold Air intake, Header, High-flow cat, 3" exhaust all the way back with a borla muffler....Gm Plans on a pulley kit and ECU upgrade ill go for that one...but there will be more parts than you can imagine (figuratively saying) in the next year just give it time they'll be out there!

 

ya i know their are going to be many many parts coming out, maybe not as much as the tuner market (japs) but enough to please me

 

If The Other Guys start making the headers for these cars, that will be the best hp move you could make...that and a pulley swap

 

Kinda new to the aftermarket upgrade thing myself, but can anyone tell me if there is anything coming out of GM that won't void my warranty? For my uses, since I mostly got it as a weekend car, it is plenty fast enough for me as is. Especially after past experiences, I really don't want to go without a warranty. I was just wondering if there was anything, other than a K&N air filter swap, that I can do that won't void anything.

 

You can buy a pulley from these guys for more power. If you want to play it safe until the aftermarket pics up just buy the 2lb pulley. But I am sure most people will be running even more boost when they figure out how to properly tune their cars.


www.southfloridapulleyhq.com

 

Don't these cars have a active bypass set at 12 or 12.5 psi?

If they do a pulley will do nothing but make extra heat from spinning the S/C faster.

 

Thats what I thought too.. we need to teach the wastegate to stay shut first

 

GM's new site http://www.gm.com/company/gmtunersource/html/home.htm

They list a cat-back performance exhaust system and a performance air-box.
No info on pricing or availability, but I'm sure that these will not void your warranty.

Hopefully they will eventually come out with the ECU and pulley upgrade.

I think I would do all of the above and slap a set of The Other Guys headers on there, and I'd be a happy man.

 

if you drop a pulley size itll bring on the boost sooner in the power band, but thats it since the PCM is programmed to open the BBV at 12 psi

 

Boost from a supercharger (blower) is a function of RPM.
I have built many V-8's with 6 & 8-71 superchargers and
never have I installed a blowoff (wastegate) valve.
We used a blowback plate on the manifold, which did not
bleed off pressure but was there in case of a backfire into
the blower. Which blew the plate and saved the blower, usualy.

Turbos need a wastegate because they function off the exhaust
and do not decelerate as the engine does.

Since it has been awhile since I was in the business, I searched
through the LSJ part numbers and the part numbers for the
supercharger kit and there is no listing for a by-pass/bleedoff/
wastegate or any other pressure bleeding device in the parts lists.

Therefore I believe there is no bleedoff of the boost on the SS.

Also, if you read the GM Sport Compact Performance Book,
GM went from the stock 84mm pulley to a 77.9mm pulley and
did nothing to the PCM or the injectors. However it did not specify
what the boost increase was.

Everyone should read this, it will answer alot of questions that I see
constantly in these threads.

If anyone knows of a bleedoff valve of some sort on the SS, please
post the part number.

 

nice post redrocket...

as for the warranty... I have a close friend that is "Mr. Goodwrench" he said that putting an catback on will only void your exuast warranty... putting a CAI will only void your intake warranty... putting rims on void your wheels... ect.

As long as its a safe upgrade it wont void anything except itself

Obviously GM will not cover an AEM intake but if your motor blows and everything was a safe and done right upgrade than yoru fine

 

Where can I find this book?

 

Thanks dude.
Everyone on this site should read the new Compact Performance Book.
I learned more about my Cobalt in this book than anywhere else I've looked.
It is loaded with parts, suppliers, instructions and a wealth of pics all done on
Cobalts.

Happy Reading

 

Look above at VooDoosoup's post, he has a link there, just click it.
Go to the top of the page and click Race Shop.
Look in the Sport Compact Drag Racing feild.
There is a link to the GM Sport Compact Performance Book.
You can download it in Acrobat format or read online.

Take a look, they have really done there homework.
I hope to see more.

 

There is a boost bypass valve thats part of the blower itself. It does have a way to bleed off excessive boost, it's not a blow off valve.

I blow off valve is designed to vent the excess boost after the throttle plate is closed. Since the throttle is before the blower in the scheme of things when the throttle is close the blower stops getting air and hence the pressure drops accordingly.

The bypass valve helps vent excess boost being made by the blower when the throttle is open.

I would say the bypass valve is analogious to the waste gate on the turbo controlling the boost levels, a blow off valve doesn't control boost levels. I blow off valve vents boost that has no where to go since the throttle is closed.

 

Thanks Zinner, I'll look for it.