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09 cobalt making more boost

Old 10-15-2018, 11:19 PM
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09 cobalt making more boost

hey, I just bought a 2009 cobalt ss turbo which has a new engine in it and itís about half way threw break in, I did a small pull last night and noticed my boost gauge hit over 150 kpa, about 21psi roughly. Now I know they make about 15 stock but the person who I bought it said that itís completely stock other than a muffler. Is there any way to tell if my car has the gm stage 1 kit or if it has been tuned. Thanks for your time!
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Old 10-16-2018, 11:39 AM
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It has for sure been tuned if it has the blue sticker 3-bar map sensors. Otherwise, it's just likely since the boost pressure is that high.
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Old 10-16-2018, 11:48 AM
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If it spiked that may have been just a fluke. If you do a full pull and it holds at 20-21 you know its got either a tune or gms1 was installed. like ex said looking at the map sensors will tell you as well.
here is what the 3 bar sensor looks like

Here is where the upper one is at and what the factory black map sensor looks like



Last edited by Kolt; 10-16-2018 at 11:59 AM.
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Old 10-16-2018, 08:07 PM
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Originally Posted by Kolt View Post
If it spiked that may have been just a fluke. If you do a full pull and it holds at 20-21 you know its got either a tune or gms1 was installed. like ex said looking at the map sensors will tell you as well.
here is what the 3 bar sensor looks like

Here is where the upper one is at and what the factory black map sensor looks like
Iíll go check in a couple minutes, thanks
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Old 10-16-2018, 08:57 PM
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Originally Posted by [email protected] View Post

Iíll go check in a couple minutes, thanks

From the looks of it my sensor is stock? Are the gms1 sensors required to have a tune?
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Old 10-16-2018, 09:56 PM
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No but it's a tell tale sign that it does have a tune. It can still be tuned with stock sensors.
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Old 10-16-2018, 11:37 PM
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Originally Posted by exninja View Post
No but it's a tell tale sign that it does have a tune. It can still be tuned with stock sensors.
it wouldnít be overboosting or anything? Since the afr only goes to about 15.5:1 and holds 13-14:1 at 21psi
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