So i just purchased a 07 cobat and well like the fuel econ over my trans am. 8 miles to the gal on the highway. hee hee. But I just found out i'm having problem with it. I took it to the dealership cause at high rpms it would lose fuel pressure and misfire. I have to come to find out that it has a larger pulley ( 272 i think ), cold air intake, exhaust, and the possibility of larger injectors. Now the dealerships states that it needs a tune but i don't know where in oklahoma or dallas to get a tune. Or is there a couple of smaller items that i need to add real quick before i do the tune. Also where can i find out the injector size that it has in it and what is the stock boost on these puppies??

Oh by the way my name is tony. Thanks guys

 

first try and find out what size pully it is exactly..should say on the pully , i have no idea what 272 is and find out what size injectors, compare to how the stage 2 ones from gm look or post a pic see if any one recognizes them oh and welcome

 

okay give me a couple of min. and i'll have pics for ya.

okay the pulley is a zz performance 2.7, and the injectors are edge products with 2 different # moo200 and 6051q00218

 

what are you running on a trans am to get 8mpg hwy? that thing must be a monster

 

that would be a 60# injector...seems as though you have yourself a quick lil 'balt if you can get it tuned, and stock boost on them is ~11-12 psi

 

holy crap the gauge is showin close to 20 pounds at open throttle till it fuel cuts.

it's okay. but it sure shakes the ground when it idles. But there are new plans here soon for it. that motor is going in a rx-7 and i'm tring to decide on waiting for the ls-9 or building a twin turbo ls-7 with nitro. figure on about 1400hp should do it.

 

yeah i would highly consider finding someone in your area with HPT to toon your **** b4 something detrimental happens

 

fap fap fap. oh sorry. tt'd ls7 is my dream engine.

 

see i don't know if there are any. There is a place here that does ls v8's but they won't touch the cobalt, and there is a place they said they would do it for 600$ but damn my ls6 doesn't cost that much to tune. Does anybody know where i can find a place near oklahoma???

and do you guys recommend the zzp tunes???

 

no canned tunes are crap, ask some members on teh regional section on the forum that are near u where to get tuned..with a 2.7 and 60# injectors u hsoul dbe pretty damn quick as long as its tuned right, thats the main thing..good tune = u pretty damn zippy

 

^^^agreed canned tunes=doody there has to be someone who will help you out otherwise spend a lil extra cash and go a state or two away and get one of the good guys to do it still may be lookin at 300-400 bucks but it will be worth it

 

Yeah...you can't get a dealership tune so don't bother. Find a place that dynotunes...there should be a bunch in texas maybe some scattered in oklahoma.

 

x2 going over a state possibly 2 and getting one of the good guys is ideal...when i need a tune after warranty is over i'll be driving down into washington from good ol canada lol

 

with the current mods that i know on the car, what should i be looking at quarter and hp wise???

 

mid- high 13's really depends on ur tune though, hp wise..its just a number some dyno low and have awesome 1/4 miles it really depends on the dyno so its just to brag really doesn't mean much so don't raelly worry about it

 

well yeah i figured. I've been in the v-8 world to long.

 

I feel ya bro, i came from the V-8 world and thought oh hp is all that matters those are the big numbers but i have noticed nobody around here really cares about those numbers they want to know if you can put that number to the ground and drive the damn thing so take it to the track some night and let us know how she works for ya...AFTER TUNING IT

 

okay so i tried the hp tuners and well it didn't work. no surging now, but still get misfires at open throttle. Any other suggestions guys?????

 

How can you try hptuners and it not work..you need a tune..HPtuners is the way. It "wont" work if you dont buy credits and unlock your car lol

 

could be spark blow out...shrug.....test a couple different gaps

 

Okay i did buy credits. and did a some what of a canned tune. It stoped misfiring at low rpms BUT as soon as it warms up she misfires at full open throttle. I guess i need to check the spark plugs to see if one didn't

 

If you are having a problem with dilevering enough fuel at high rpms,

have you checked the fuel filter? It could be reducing the pressure available to the engine... Since your car is modified, it will need more fuel pressure than a stock one, and might jsut be enough to cause your problem.

 

is there a aftermarket high flow one?????

 

Wow, okay, you have a lot of stuff going on here that it seems the cars previous owner stuck you with. What you need to do is get the car to a tuning shop. Let them inventory the aftermarket modifications done to the car and then have them write a custom tune for you. That would be the best course of action.

 

yeah but don't have the cash at the moment.