What is the peak boost the car will hit with just a stage 1 tune?

No aftermarket boost control
no manual boost controller
no electronic boost controller


just what is included in the stage 1 kit for the LNF cobalt.

How much boost?

 

https://www.cobaltss.net/forums/4667903-post1.html

Is this true?

23psi?

 

Yes sir 23psi. But gms1 is a waste seeing as you pay that much for sensors and a flash to ECM and get the normal gms1 numbers. It's better off to get a dp and have someone tune the car for the price of gms1. It'll make more power and the car will show it.

 

Oh. I'm trying to find a tune that stays at stock boost.

 

That sounds about right with hard pipes. Only issue is ive read that tune has terrible knock. Not a dialed in tune it seems. Guess GM didnt want to spend to much time on something that isnt a V8. That or elevation effects the tune.

 

Any good tuner can do that but you aren't going to make any more power.

What are you trying to accomplish?

 

I can make more power without increasing the boost.

spark advance, turning off power limiters like this fabled "learn down mode," etc.

The stock tune will have a certain level of balance between emissions control, power, fuel economy, and safety. You can tilt that towards power by sacrificing little bits of all the others.

 

An aftermarket tune@ 22 psi will be better than gms1 and the peak boost would be no different. Plus your fuel trims would be much better which is safer also. I went with Gms1 first and I wouldn't do it again looking back on it.

 

gms1 is already out of the question because it doesn't run stock boost.

 

Why do you want to run stock boost? Increasing timing may give you a slight power increase, but jumping the boost is where its at.

 

Because this is for spec racing and the spec doesn't allow modification of boost control.

 

ha 23psi, mine gets 25psi. and theres nothing done to it besides minor things. and it rips enough for me, trifecta tune was to much power not enough grip

 

Is that exact rules? GMS1 is a dealer installed item and is warrantied.

 

rules dont say anything about dealer installs or warranties. they say no modification of the boost control

 

GMS1 is a great tune. it keeps your warranty, won't blow anything up and isn't THAT expensive. it makes enough power. my buddy ran a 13.6 with GMS1 intake and DP. hell i ran a 14.1 @ 104mph with a really crapy 60ft and i have GMS1 only no other mods. yes it's a bit more expensive than a custom tune and won't make as much power but that's the price you pay to keep your warranty and avoid problems later with the increased power going past the cars mechanical limits.

i'm not sure how they'd know? the boost pressure varies with elevation, air pressure and humidity so there is no set level? some people make 260hp on 19psi and the other guy at a higher elevation on a hot day makes 260hp at 21psi on the same tune.

 

I...I dont know what to say to that.

Just no.

 

no what? this topic has been beaten to death. the fact is the tune is supposed to make a certain amount of power at a certain psi. but it can vary depending on the climate. yes anyone who knows what the stock boost levels are will see your boost noticeably higher than the stock levels... i get that but is there going to be a guy riding along with you to check? i'm assuming it's an honor system?

you can keep stock boost levels with a custom tune and have it adjusted to make a bit more power... but as others have stated, the best way to make more power is to make more boost. goodluck!

as for your comment about no modifications of boost control, that would mean any type of modifications to a tune since the tune controls the boost levels no?

 

no to the idea of hiding the amount of boost you are running.

 

IIRC boost levels for GMS1 are around 20.5 psi. but can go anywhere between 19-21 and as high as 23psi with a spike.

hope that answers your question.

 

With GMS1, there is no modification to the boost control. Boost control is still modulated by the stock ECM and waste gate duty cycle. If you want an honest opinion from someone who really knows his ****, PM Wangspeed.

 

modification of the wastegate duty cycle table in the ECM is considered modification of the boost control.

It may not be mechanical modification but it is software modification.

 

I don't agree with that. GMS1 is a GM product. It should fall under what it considered stock and should not put you in the esp category.

 

well sorry but it really doesn't matter what you think of it. it matters what the rules say.

It doesn't matter that its a GM product. TRD superchargers are a toyota product, dealer installed, but if you have on on your Scion TC its street mod.

 

If you're willing to run full e85 you can basically double your timing advance and run a bit leaner, there might be some gains from cam timing but not much.

 

You are 100% correct. E85 is the way to go for ST class. Its the way to go for any class its allowed in.