bought 2007 ss sc - Cobalt SS Network

2.0L LSJ Performance Tech 205hp Supercharged SS tuner version. 200 lb-ft of torque.

bought 2007 ss sc

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Old 07-24-2017, 01:16 PM
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bought 2007 ss sc

It has the 71.9mm pulley. and the injectors have black tops and grey body? they don't look shiny like the ones i googled for gm stage 2.

how can i tell if the computer is tuned? i'm trying to figure out what exactly is on the car.

its boosting about 15psi via the gauge

the injectors look just like this except the bodys are dull silver not shiny lol. i wanna make sure the computer is tuned somehow.

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Old 07-24-2017, 01:51 PM
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Does the pully bolts look blue n only 4?
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Old 07-24-2017, 01:52 PM
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stock injectors have a bright green top, so you have aftermarket injectors for sure. if the connector is the same as the ones pictured they are likely the same injectors, and those are 42lb/hr. the ecm would have had to be tuned for them or it would idle very rich and throw codes.

the pulley is on the extreme side for those injectors. does the pulley have the 4 blue bolts holding it on? are there are distinct markings on it? with the diameter you gave id assume the previous owner installed a gm stage 2 kit and then put the stage 3 pulley on.
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Old 07-24-2017, 02:00 PM
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Thx for the replies.

The pulley has four blue bolts. It says 71.9mm on it. Nothing else.

The only wierdness with the car is it doesn't like to be lugged at all. It seems to be getting better the more I drive it. The idle bounced a little the first time I drove it but it doesn't do it anymore. There is just slight hesitation at low rpms.
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Old 07-24-2017, 02:01 PM
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It has the stock airbox. Not sure if it has the mod or not. But the supercharger is fairly audible. I bought a cheap intake for it to test out I was hoping with the stage 2 tune it wouldn't throw a code with it.
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Old 07-24-2017, 02:28 PM
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Sounds like a GM stage 2 kit. Your fine. If there is no CEL. Don't worry about it. That tune runs rich but it's def awesome!
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Old 07-24-2017, 04:04 PM
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Old 07-24-2017, 06:09 PM
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nice car - was that the one listed on ebay for awhile?
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Old 07-24-2017, 07:10 PM
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Nice!
i have an arm rest that would fit in there perfect just sayin
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Old 07-25-2017, 05:46 PM
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not sure if the car was on ebay or anything. i bought it from a dealership.

with the gm stage 2 running a bit rich, would adding a mid length header take up the slack or am i going to need to get it tuned?

i do not like the loud muffler and i plan on putting something like a turbo thrush muffler on it. i don't care how much top end it loses i can't take the sound. when i want to hear the s/c i have to dip into it enough that the exhaust is blasting. i dont want to draw unneeded attention
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Old 07-25-2017, 05:56 PM
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oh another thing. could you choose which spoiler you want when you bought them? most of the SS SC i see have the bigger spoiler. just curious i don't mind this one or the other one for that matter
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Old 07-25-2017, 05:58 PM
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also, i do not have to DEQ where i live and if i go without the cat will the gm stage 2 tune throw a code?
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Old 07-25-2017, 06:05 PM
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You will be fine with an intake and full exhaust. Even a cat less downpipe. Word of advice. If you can run my old exhaust. It be great.
I ran a Bad Mab header. Zzp downpipe with high flow cat. Corsa touring cat back. Sounded so goooooooood
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Old 07-25-2017, 06:09 PM
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i havent' gotten under the car to look and see what exhaust is even on there. i did look in the engine bad and see that it still has the stock exhaust manifold and downpipe. not sure what muffler is on there now and if it even has a cat or resonator.

i had a turbo thrush muffler on a acura integra i turbocharged a long time ago and it killed the HP but it was not loud lol
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Old 07-25-2017, 06:11 PM
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Old 07-26-2017, 07:03 PM
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Make sure you get a good intake from Zzp or ottp those eBay ones are junk or the air box mod is great also
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Old 07-26-2017, 11:47 PM
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No way I'd spend that much one a couple pieces of bent pipe. I'm too cheap.
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Old 07-27-2017, 02:09 PM
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i looked under the car the exhaust all looks stock except it has this little muffler that says "PRO SPEED" on it.
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Old 07-27-2017, 02:45 PM
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Oh man. Got another cheapo! Spend twice and complain. All aboard the cheap train cheap cheappppp!!!
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Old 07-27-2017, 06:06 PM
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Originally Posted by Johnny Bliss View Post
No way I'd spend that much one a couple pieces of bent pipe. I'm too cheap.
Yeah well if you don't get the maf position right it ain't gonna run right
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Old 07-27-2017, 08:22 PM
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Originally Posted by 06blackbalt View Post
Yeah well if you don't get the maf position right it ain't gonna run right
positioned right as in?

it has two screws and it could be put in backwards. it looks like it should be sitting the same way
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Old 07-28-2017, 12:33 AM
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As predicted the eBay intake as it comes didn't work right. It fit fine and looks good but the angle of the maf must be messing things up. It ran fine but had no power past like 4k rpms. I'm going to cut it up and use the existing hard plastic piece of the pipe and there was already a metal piece at the end with a aem filter on it.

Sucks the Cobalt are so sensitive with the maf
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Old 07-28-2017, 10:09 AM
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Get rid of the maf lol
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Old 07-28-2017, 04:43 PM
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I like map only better but mafs what it's got.

I took the intake off and cleaned the maf. It feels like it lost power? What's the deal. I put it back how it was.

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Old 07-28-2017, 06:56 PM
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the vacuum lines going to and from the boost bypass valve were really cracked and shitty. it didn't seem like they were leaking just from me plugging it and blowing into it. but i put a new vacuum line on from the supercharger to the valve, and i bought two vacuum plugs and blocked off the route from the solenoid to the bypass valve.

i have gm stage 2 ecm so im not seeing any more boost. (i see 14-15psi). but it does put out a lot of boost part throttle which i like for cruising around... but it probably doesn't do much but use more gas lol
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