Chevy Cobalt Question

[vancitydsm]

Sorry for posting about a car other then a dsm, but my buddy needs help and i cant find shit on the net for it. He has a 07 chevy cobalt , he works at a GM dealership and he got some GM mods done to it so that he stays within warranty. He has intake pipe, exhaust system supposedly bigger pump, and injectors.. oh and an undersized pulley to promote more pressure. He is getting top end rev fuel cut. Boosting at around 18 pounds and close to red line. He tells me the dealership punched in some code to his ecu with a special computer or something. I'm sure they tryed flashing the computer with different parameters or something. My question is, is there anything available after market for cobalts and keep it stockish without having to chop factory wires? just like a plug and play system? sorry again for posting this here im sure its not gonna go well with the moderators, but hes my buddy and ill take the chance.

 

[Car_guy_09]

Well im a big cobalt fan so il see if i can help, The lsj's (the ss/sc motor) dont get fuel cut that im aware of. It sounds like he has GM performance stage 2 kit, Which is bigger injectors, Smaller pulley on the supercharger and a ECU reflash. Now the stage 2 tune is pretty rich so allot of guys take a throw a even smaller pulley on there to lean it out and make more power. Ask you buddy what size pulley he has, As far as i know i dont think i bigger fuel pump is needed till after you max out the factory supercharger so i doubt he has that. Il read up to refresh my memory but off the top of my head 18psi sounds high for a stage 2 tune.

 

[absolute_DSM]

And he works at the dealership. This gives high confidence into my GM dealerships and its techs.

 

[vancitydsm]

hahah ya but i gotta say, that cobalt is one powerful vehicle. I can't really blame the tech's because they aren't tuners and they don't have a dyno... It's weird he tells me around 2500 - 3500 he's also getting it, at WOT that is. I dunno , like from what he describes it seems like fuel cut. They remapped it like you said or flashed it whatever its called. He supposedly has the stage 2 kit he tells me all stage 3 is , is nitrous.. I can't figure out what would cause it personally. He said the dealer has changed his pump 2 times and flashed his ECU like 2-3 times. There is such limited advise on SS/SC on the net you guys seem to know more bout cars then many.. I went to some cobalt forum and i shit you not, there was a guy with a wiseman title or something more then newbie.. the guy told another dude to put a " bigger " pulley on the car to increase the boost.. i was like wtf i dont know shit about SC's and i know its a smaller pulley. The next post underneath his was a newbie which corrected him, that was pretty sad if you ask me. Makes me appreciate dsmtuners more now.

 

[absolute_DSM]

Wow, even more confidence in GM.

You need to log the way the engine is running. Dealership wise, using a scope, or tuner wise using a laptop with appropriate software that can log the fuel and timing issues.

Using a bigger pulley would decrease the boost band-aid ' in the problem.

 

[vancitydsm]

i think you miss understood me haha.. no the dealership didnt put a bigger pulley in, i was on a cobalt forum , and some guy i guess which was equivalent to the proven member status we have here said " if you want more power then just get a bigger pulley for more boost, more boost = more power " and some guy with new member status said " dude smaller pulleys create more boost not bigger ones " it was a forum not the dealer. Dealership guys are usually not the best of techs. you are right about that one. By the way dude, i gotta say your dsm if FING HAWT.. it looks soo damn mean grats on that beautiful FING car man really

 

[absolute_DSM]

Thanks for the compliments. Ive never posted this but drinkin and bad times... MySpace.com - Eric - 23 - Male - www.myspace.com/randomtuner

Im glad youre keeping this civil.

Smaller pulley will give more boost. BUT without proper fuel and tuning, YES you will hit problems. On the DSMtuners forums we call it fuel cut cause our turbo computers will give us a warning. His ECU may not give that problem.

He needs to grab up a cheap logger to check his issues.

Then he can just throw in a smaller pulley, some bigger injectors, pump, and AFPR, grab a tuning device and start hurtings some "import's feelings".