andrew97

Does anyone have the GM Stage 2 kit with the Cobalt addiction 2.79" pulley on it? If so what kind of numbers are you guys running?

ReMz

no numbers, but it pulls like a banshee.

be careful about a 2.8" with GM Stg2... it maxes out the 42lb injectors at sea level. it's safer to run 60's.

braddddddd991

that pulley = no good with just stgII get a 2.9

BLKblurr06

what if you are considerably above sea level?

Johnboy12358

Get a wideband, or go to the Dyno and watch your o2 that way, the pulley isnt that expensive(dont loose much if you have to take it back off), and this is the only way to know exactly how it will make your motor run.

burntorange

Hey, I live in San Antonio, Texas and ALL I have is the GM Stage 2 with the Cobalt Addiction 2.79" pulley and I pulled a 13.9 second pass @ 101 with too much spinning in first! I ABSOLUTELY LOVE THE SET UP!!!!! And I still get a little over 30mpg! I have a 3" CAI coming in the mail too!!!! I also have some brand new drag radials and a dampner on their way!!!! My goal for the next few months is to brake into the 12's! can't wait! Totally get the setup though man!

kwest

hey man thats the way i was thinking of going...so does the injectors,stage 2 belt, and tune work good with that 2.79in?? what you think about going down to a 2.7in???

hatrickstu

iTrader: (1)

that tells us absolutely nothing

do not run a 2.8 pulley you are overtaxing the injectors

burntorange

well, I have had this set up for 13K and NOT ONE PROBLEM and I have driven the **** out of it since I bought it. I wouldn't go down to the 2.7 though, without throwing in bigger injectors. Yeah, hatrickstu is on the right track though, but the 2.79 is on the line of too much. I want a 2.6" with a ported and polished M62 blower, 60 pounders, and other supporting mods. So, if you go smaller, upgrade the injectors man.


Oh, and when you say that I am over taxing the injectors, it is universally excepted that the stage 2 tune runs a little richer, so evening it out is just fine. Plus, not everyone floors it everywhere they go, if you don't use all 17.5 -18 psi then the injectors aren't working as hard. Plus, this setup is being used by a good majority of Cobalt owners and has been proven to be the ****, but in the end, it is up to you man....it is your car.

ItalianJoe1

iTrader: (10)

The only real problem with this setup is it does not use all the power the car could have. The stage 2 tune is already dumping fuel, and now the car is trying even harder to flood the car, due to the extra air. I never dynoed with the 2.8, but it feels a bit stronger than the 3". Before I do anything else the car will be getting a wideband and a tune, then most likely larger injectors and a 2.6, but only time will tell...

Maxim_X

There are hundreds of Posts on this subject. Use the search button.

Cliff notes= If your going below a 2.9 w/ stage 2 you better get a good tune or just move up the the 60's w/ a tune.

QuikSilverSS

I dyno'd last week at sea level on a nice cold day and put down 257whp and 232 tq, my buddy with stage 2, GMPP Touring exhaust, Injen Intake and a 2.9" put down 245whp with his 16" winters and then switched to the 18's and got 231whp. The a/f ratio isnt the problem with your injectors its the injector duty cycle, they are running well over 100% at redline which could cause issues down the road. I have been running my setup now for like 7 months and have had NOT ONE PROBLEM!