Installing GMS1 next week - Cobalt SS Network



North Pacific WA and OR

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Old 10-21-2015, 06:13 PM   #1  
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Installing GMS1 next week

Yosh! Because I'm a poor bastard but work at a Dealership it was easier for me to AR a GMS1 kit instead of buying HP Tuners and finding someone in my area to tune it. So with that said next week sometime I'll be getting the GMS1 kit installed and the reflash done. I only have a K&N CIA on my car at the moment and the Catless Downpipe from ZZP sitting in my garage. What kind of power gains should I be expecting and what boost numbers do you think I would be putting out.

2009 Cobalt SS/TC || 74k Miles
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Old 10-21-2015, 08:59 PM   #2  
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This is very easily searched for but il throw you a bone.
Make sure you buy the adapter harness from crate engine depot so they don't have to cut your harness. It will save you allot of issues down the road! Plus you can always go back to stock without problems.

I put down 282whp torque figure was skewed but based on averages I should have put down about 310-320wtq

My mods were k&n Sri 3"catted dp and gms1 at the time.

Also make sure the dealer uses the correct o rings as the ones that come on the sensor need to be changed. And a tab needs to be cut off on the lower sensor.
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Old 10-21-2015, 09:01 PM   #3  
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Since no cars are on warranty any more I would just get the ZZP PCM tune and buy the sensors from crate engine depot. Better tune more power and you wouldn't need to buy hpt.
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Old 10-21-2015, 10:25 PM   #4  
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Why not just buy the sensors from zzp they only sell the plug and play gms1 sensors?
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Old 10-22-2015, 08:00 AM   #5  
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Or this
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Old 10-23-2015, 03:17 AM   #6  
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I put down 286whp and 308wtq on my Stg1 with K&N SRI. Everywhere in Wa, I pretty much get 20psi. Occasionally, if conditions are right, it'll jump to about 22-23psi, and once I saw about 25-26psi, but 99/100 times, it boosts 20. Unfortunately, mods don't really do anything for factory or GMS1, as they have the learn down.
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Old 10-23-2015, 07:21 AM   #7  
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Quote:
Originally Posted by HHRFrenchy View Post
I put down 286whp and 308wtq on my Stg1 with K&N SRI. Everywhere in Wa, I pretty much get 20psi. Occasionally, if conditions are right, it'll jump to about 22-23psi, and once I saw about 25-26psi, but 99/100 times, it boosts 20. Unfortunately, mods don't really do anything for factory or GMS1, as they have the learn down.
GMS1 removes the learn down fyi.
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Old 10-23-2015, 08:05 AM   #8  
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Or at least makes it a bit more lenient.

Gms1 cars with no bolt ons usually put down about 271-275whp 295-300wtq dp and k&n are usually good for about 10-15whp and wtq gain.
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Old 10-23-2015, 08:11 AM   #9  
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Huh, Everything I've read said that STG1 still had the learndown.
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Old 10-23-2015, 08:16 AM   #10  
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Originally Posted by HHRFrenchy View Post
Huh, Everything I've read said that STG1 still had the learndown.
Everything I read said it's removed.

Also, read this below:

http://www.crateenginedepot.com/1921...70-P17741.aspx

Last edited by Staged07SS; 10-23-2015 at 08:28 AM.
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Old 10-23-2015, 09:37 AM   #11  
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Quote:
Originally Posted by Staged07SS View Post
Everything I read said it's removed.

Also, read this below:

19212670 Cobalt, Solstice, HHR Stage Kit 19212670
I stand corrected...
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Old 10-23-2015, 10:30 AM   #12  
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It's not that the learn down is entirely not present the engine tuning doesn't work that way. It just allows more leniency on the desired hp output so it doesn't lock it down when it senses more flow. It will still cut it off at some point. It just won't cut boost as early to make up for additional airflow.
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