A friend of mine came into the shop tonight with his Cobalt. He wanted to make some pulls on the car and see if I could help figure out why the car was going into limp mode under boost. To make a long story short, this car has a ETC vs RPM vs Airflow table that is different then anything I have ever seen before in the GM PCM's The car has a manual boost controller on it. Lets just say I learned a lot tonight on how these pcm's work.
The factory turbo, intercooler, and plumbing is all gone. It now has a prototype turbo kit that was done by a shop here in Ohio using a newly designed turbo and intercooler from precision. This car maintains the factory fuel system. What is even more impressive is the exhaust is totally stock from the factory down pipe to the back. It still retains the factory cats. The car is coming back in two weeks with a 3 inch down pipe and a cut-out. It will be interesting to see how the power increases along with the spooling of the turbo.
Pump Gas
24-25 PSI
18 degrees of timing
0 Knock
Coolant temps were 210 degrees during the pulls.
A/F still needs some attention
http://75.180.27.125:50001/Dyno%20Graphs%20and%20Pictures./Dyno%20Graphs/2009%20Cobalt%20SS%20Turbo.jpg