DTM Brian Posted January 13, 2009 Report Share Posted January 13, 2009 (edited) 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 Edited January 13, 2009 by Mobile Chassis Dyno Quote Link to comment Share on other sites More sharing options...
THE BUCKET Posted January 13, 2009 Report Share Posted January 13, 2009 nice Quote Link to comment Share on other sites More sharing options...
AJ Posted January 13, 2009 Report Share Posted January 13, 2009 his name on here is BoostKing Quote Link to comment Share on other sites More sharing options...
Jizzle Juice Posted January 13, 2009 Report Share Posted January 13, 2009 Didnt kno those were out yet! Nice numbers Quote Link to comment Share on other sites More sharing options...
STEVE-O Posted January 13, 2009 Report Share Posted January 13, 2009 think there is one at mcdormans for a reasonable price. it was red and only like 26gs i think but dont quote me 1 Quote Link to comment Share on other sites More sharing options...
Ef8sirJunkie Posted January 13, 2009 Report Share Posted January 13, 2009 thats alot of PSI Quote Link to comment Share on other sites More sharing options...
Farkas Posted January 13, 2009 Report Share Posted January 13, 2009 thats alot of PSI My chipped VW makes 21? Quote Link to comment Share on other sites More sharing options...
Ef8sirJunkie Posted January 13, 2009 Report Share Posted January 13, 2009 My chipped VW makes 21? no i know alot of people with high boost cars, what is this cars psi stock at and stock base dyno run brian? its got good TQ but i would think at 24-25 psi it would have more HP figured mid 5's to 600 range. Quote Link to comment Share on other sites More sharing options...
Farkas Posted January 13, 2009 Report Share Posted January 13, 2009 no i know alot of people with high boost cars, what is this cars psi stock at and stock base dyno run brian? its got good TQ but i would think at 24-25 psi it would have more HP figured mid 5's to 600 range. Has a lot to do with how well the head flows and the manifolds.. they're not always the most efficient in design from factory. A change of manifolds, pistons and head work can make large improvements. Quote Link to comment Share on other sites More sharing options...
Ef8sirJunkie Posted January 13, 2009 Report Share Posted January 13, 2009 Has a lot to do with how well the head flows and the manifolds.. they're not always the most efficient in design from factory. A change of manifolds, pistons and head work can make large improvements. true but i thought it has a kit on it now so the exhaust manifold has been changed although a lil head work would do alot. im glad to hear that it holds 25psi on stock internals wonder how much these new motors can be pushed. Quote Link to comment Share on other sites More sharing options...
coltboostin Posted January 13, 2009 Report Share Posted January 13, 2009 no i know alot of people with high boost cars, what is this cars psi stock at and stock base dyno run brian? its got good TQ but i would think at 24-25 psi it would have more HP figured mid 5's to 600 range. You need to read up on pressure vs. flow boss. The "Psi" is all but irrelevant for how much power the car is making. For example. My Colt at 25psi on a 14b- 239whp. At 25 psi on a 60-1 441whp At 25psi on a GT42 659whp. According to your sig, your some kind of Honda tuner? As a tuner, I feel like I should not be explaining this too you. Quote Link to comment Share on other sites More sharing options...
boosted98gst Posted January 13, 2009 Report Share Posted January 13, 2009 cfm> psi Quote Link to comment Share on other sites More sharing options...
Ef8sirJunkie Posted January 13, 2009 Report Share Posted January 13, 2009 You need to read up on pressure vs. flow boss. The "Psi" is all but irrelevant for how much power the car is making. For example. My Colt at 25psi on a 14b- 239whp. At 25 psi on a 60-1 441whp At 25psi on a GT42 659whp. According to your sig, your some kind of Honda tuner? As a tuner, I feel like I should not be explaining this too you. completely understand but there is also an upgraded turbo on this car and no size was said. i didn't know you could push that much boost on a 14b without having problems with the wastegate actuator, actually thought that was a problem with all internal wastegates and weren't supposed to put to much pressure on them. Quote Link to comment Share on other sites More sharing options...
2 Sweet Posted January 13, 2009 Report Share Posted January 13, 2009 Aren't those PCM's ridiculously complex, and therefore very difficult to work with? The guy on here with the Saturn Sky knows a shit ton about them, hopefully he will chime in because I don't remember all the details, but it was discussed on here before. Very interesting stuff Quote Link to comment Share on other sites More sharing options...
DTM Brian Posted January 13, 2009 Author Report Share Posted January 13, 2009 Aren't those PCM's ridiculously complex, and therefore very difficult to work with? The guy on here with the Saturn Sky knows a shit ton about them, hopefully he will chime in because I don't remember all the details, but it was discussed on here before. Very interesting stuff The ecm is different. Like I said I learned alot. As far as the size of the turbo. I am told it is good for 500 whp. The stock turbo would make over 20 pounds under 3000 rpm's Quote Link to comment Share on other sites More sharing options...
DTM Brian Posted January 13, 2009 Author Report Share Posted January 13, 2009 Here is a graph of what the car made in 100% Stock Form http://75.180.27.125:50001/Dyno%20Graphs%20and%20Pictures./Dyno%20Graphs/2009%20Cobalt%20SS%20Stock.jpg Here is a graph of Stock vs Modified http://75.180.27.125:50001/Dyno%20Graphs%20and%20Pictures./Dyno%20Graphs/2009%20Cobalt%20Stock%20vs%20Precision%20Turbo.jpg Quote Link to comment Share on other sites More sharing options...
coltboostin Posted January 13, 2009 Report Share Posted January 13, 2009 completely understand but there is also an upgraded turbo on this car and no size was said. i didn't know you could push that much boost on a 14b without having problems with the wastegate actuator, actually thought that was a problem with all internal wastegates and weren't supposed to put to much pressure on them. But it could have been upgraded to a say GT28, or V-trim, both of which are not even capable of the HP numbers you quoted. Again, just get that PSI number out of your mind. (unless we had more information) You can run 30+ on a 14b. No signal to the gate=party time. People have gone 10's on a 14b. Ideal? No. But you can do it. Quote Link to comment Share on other sites More sharing options...
DTM Brian Posted January 13, 2009 Author Report Share Posted January 13, 2009 no i know alot of people with high boost cars, what is this cars psi stock at and stock base dyno run brian? its got good TQ but i would think at 24-25 psi it would have more HP figured mid 5's to 600 range. Remember this car does not rev like a Honda with VTEC. Also keep in mind the exhaust is only 2 1/2" and both CATS are still in place. Just wait for the 3" down pipe and cut out Quote Link to comment Share on other sites More sharing options...
Ef8sirJunkie Posted January 13, 2009 Report Share Posted January 13, 2009 But it could have been upgraded to a say GT28, or V-trim, both of which are not even capable of the HP numbers you quoted. Again, just get that PSI number out of your mind. (unless we had more information) You can run 30+ on a 14b. No signal to the gate=party time. People have gone 10's on a 14b. Ideal? No. But you can do it. Hmm makes me look at internal gated turbos in a whole new light thanks. was always known of the waste gate arms breaking so naturaly didnt think they could handle to much pressure. the numbers on this car is solid and its a great gain over stock. Quote Link to comment Share on other sites More sharing options...
ruinms Posted January 13, 2009 Report Share Posted January 13, 2009 vernon told me he was gonna go out there in a few weeks and make some pulls. ill have to congrat him next time i see him. wasnt this on hp tuners Quote Link to comment Share on other sites More sharing options...
Zach1647545520 Posted January 13, 2009 Report Share Posted January 13, 2009 Holy Shit Quote Link to comment Share on other sites More sharing options...
Putty Posted January 13, 2009 Report Share Posted January 13, 2009 That's impressive Quote Link to comment Share on other sites More sharing options...
kenny Posted January 13, 2009 Report Share Posted January 13, 2009 completely understand but there is also an upgraded turbo on this car and no size was said. i didn't know you could push that much boost on a 14b without having problems with the wastegate actuator, actually thought that was a problem with all internal wastegates and weren't supposed to put to much pressure on them. Your posts are making my head hurt more and more as I read them. Problems with an internal gate? Do you have a clue what you're talking about? Quote Link to comment Share on other sites More sharing options...
kenny Posted January 13, 2009 Report Share Posted January 13, 2009 On topic: those are some seriously impressive numbers. Call a brother when he comes back in, I'd like to see that. Quote Link to comment Share on other sites More sharing options...
DTM Brian Posted January 13, 2009 Author Report Share Posted January 13, 2009 On topic: those are some seriously impressive numbers. Call a brother when he comes back in, I'd like to see that. Making myself a note to call you. I am guessing two weeks. Quote Link to comment Share on other sites More sharing options...
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