I remembered seeing something about issues with accuracy on RPD once GMS1 is installed but couldnt find it again. Those with these two options, have you had any errors? A big reason I bought this car over another SS was the RPD and if GMS1 renders it inaccurate that would be quite upsetting.

 

Mine is good. No errors at all.

 

power reads a little low, thats it. i've had stage 1 since may, no probs with the rpd.

 

same here no issues with my RPD at all. works as advertised.

 

Dumb question but what's RPD?

 

Great to hear. Thanks.

 

Reconfigurable Performance Display

 

I'm a nub whats a GMS1?

 

It's a GM sanctioned (keep your warranty) tune in combination with two new map sensors. Adds ~60HP and ~80 lb-ft

 

So I just take it to a chevy dealer and tell them I want a GMS1 tune and the warranty will cover it?
I just bought my cobalt 3 days ago... What is a map sensor lol...

 

Lol. So much 1 off information :p

GMS1 adds 20hp and 60 tq. Going from stock 260/260 -> 280/320.

Being warrantiable means that they will still honour original warranty even with the new upgraded GMS1. You will still have to pay for GMS1 and it's insallation. Installation includes a computer flash and a new sensor(Mass Air Pressure) Cost widely varies between region/dealer.

 

You want to tell them you want the turbo upgrade for your cobalt.
Here is a link to what it is. 19212670 Cobalt, Solstice, HHR Stage Kit 19212670
And yes it is backed by warranty. It is a GM tune. As for map sensor, someone else will have to tell you exactly what that is. As for the power claims posted, that is defiantly not what GM claims.

Edit:^Beat me to it. Guess I'm not quick enough on my phone.