Proper tuning is also going to help out a great deal here. I'm running a 2.5" pulley on my car and have richened the upper rpms up a bit to accomodate for the increased heat and lean conditions. However i'm also running about every cooling mod available (check sig) and my IAT's on even a 90 degree day are about 165 or so. So far I havent had any issues with knock at all on this setup...

 

This thread has proven sum what interesting. I was planing maybe a year from now, Building up the 2.0 internals, and going turbo (Figuring sum how there is a good tune out ther for this setup) and this thread has kinda put me at ease with my idea. I realize at some point the eaton is just Blah, and can't do much more. Given the fact is pumping out alot of power and what not, I now realize Turbo will be the "Next Level" as far as the Cobalt is concerned.

I'm gunna go back and +1 rep for all U ppl I think contributed good info in this thread. (To many to name)

 

Yes I was right where you are when I started. I had only planned on doing the 300HP build from GM. I have gone through several plan changes to get to where I am.
First suggestion is always, decide where you want be HP wise.
Second suggestion is always over build.
Third suggestion is don't try to scrimp. You already have the right attitude of wanting to do it first not because, you blew your engine.
If you are staying around the 300whp level I would say, pistons, valvetrain, cams and head. Add to that stronger driveshafts and a clutch.
Beyond that powerlevel I would plan on not using the M62 and I would wait and see what other members have break when the put bigger power to their wheels. The transmission is a big question mark when it comes to drag racing and big power. Having a lot of whp and no means to deliver it will be disappointing. It was because of the lack of reasonable alternatives that I chose to go RWD.
I hope this helps a bit.
PS I am not a big fan of the small pulley.

 

Great advice for not only a cobalt build for any general build. +rep

 

Internals are not going to be enough. We do not recommend 2.5. I try to tell my customers not to go under a 2.7. The s-charger is just not efficient past that point. If they really want It we still do offer the 2.5 pulley. The gains from 2.7 to 2.5 are not worth the extra beating on the supercharger and the small hp change. As far as fueling goes you can convert your stock rail into a dual feed rail. This will help with some of the 4th cylinder starvation. However you should still look at running a additional pump and a controller for it. No matter how nice and expensive the pistons are that you put in your car they will eventually go just like the gm ones from running to lean in the last cyl unless you take the proper precautions.

 

With all this stuff tho, how is the Computer going to react to an extra fuel rail or a higher compression?? Like, how would tuning get done for this? A place with a dyno would be able to tune it up?

 

Ljavy17 and I have been running a 2.5" pulley for awhile now and no problems and he runs on meth and his car runs strong as hell...strong enough to hang with a ferrari and we only boost 18-19psi with the 2.5 bc of the full exhaust

 

im currently in the process of drawing up and building a dual feed rail. or split rail as some might call it.

 

I'd get one!

 

it's nice when your friends have metal lathes, and full blown million dollar cnc machines.

well his work does at least

 

You guys should build a #4 cylinder support kit with everything we need to build this duel feed rail, so we can protect our #4. run test and post your results. i bet thease would sell.

 

We are currently working with a company to provide you guys with a upgraded rail. Hopefully we will have something for you by mid summer. We are not going to sell or make a dual feed from the stock rail or a kit for one. I dont believe in selling hacked up oem stuff. Something such as feeding a rail in two locations is very easily done. However, Its not something personally im going to put on the shelves and sell. I would rather have a professionally built system available for you guys so you know you are getting a high quality product that has been flow tested and proven to provide more fuel and less drop then the stock rail.

 

that sounds awesome. I too would rather have a professionally designed replacement as opposed to a bandaid on the existing system.

 

Cobaltperformance that would be awesome. Thanks a ton for looking into some R&D for us here. I know I would personally buy a high flow rail in a heartbeat if one was offered.

 

if you build the rail. don't rape people on cost, charging 200 bucks for a 35 dollar part isn't what i would cost effective to us.

 

The cost will be determined by the company that is actually making them. We only have a very small markup. So hopefully they will come back to us with a nice low price. If not we will look into other places for you guys.

 

Ofcoarse thats what i meant sounds like you guys are on it keep us posted