An alternative to tuning (if you don't know how or don't have anyone that knows how to tune) is the Jet Performance Module. They have stage 1 and stage 2 modules for the 2.2L and 2.4L. I purchased a 2.4L stage 1 module from JEGS ($239) and installed it yesterday. The install instructions are just a generic GM module install and leads you to think the module attaches to the bottom connector -- it goes in the middle of the three connectors. The C1 connector is the smaller top connector, C2 is the middle connector (use this one), and the C3 connector is on the bottom. The C2 and C3 connectors are 73 pin each. One major advantage of the module is that you can take it off and resell it if you trade in or sell your Cobalt -- can't do that with a "tune". "IF" you can find someone that is truly able to tune your Cobalt that probably is the best, the Jet Performance module makes the "average" owner a "tuner".
After install I noticed right away that it runs richer -- can smell it -- and the throttle response out-of-gear (auto) is quicker. Driving the car I get more off-the-line wheel spin then before and the acceleration feels better at part throttle for sure. It seems to go through the gears quicker but I can't prove that yet. Fuel economy hasn't suffered -- my DIC is recording better MPG then before (27.1 Vs 26.9 in-town stop and go driving).
Anyway, for those of you like me -- tuning impaired -- this Jet performance module could be your answer.
http://www.yourcobalt.com/photoplog/index.php?n=313
After install I noticed right away that it runs richer -- can smell it -- and the throttle response out-of-gear (auto) is quicker. Driving the car I get more off-the-line wheel spin then before and the acceleration feels better at part throttle for sure. It seems to go through the gears quicker but I can't prove that yet. Fuel economy hasn't suffered -- my DIC is recording better MPG then before (27.1 Vs 26.9 in-town stop and go driving).
Anyway, for those of you like me -- tuning impaired -- this Jet performance module could be your answer.
http://www.yourcobalt.com/photoplog/index.php?n=313