Ronn the whole reason for this thread is that I don't think that has been verified. If it has I couldn't find it on here in hours of searching last night.

Streetdrag if you got it dynoed and posted results you would be the man. I looked for a long time and could find anyone else on here who has.

 

270-290 range is probably what to expect with GMS1 and basic boltons. don't think you'll see 300+

 

Cool thread! When the car was purchased, and I decided on the GMS1 (fully knowing that if I want more than 300whp, I must go custom), my goal was 300whp. I believe it can be done, but you're probably capped at that if you go that route.

I of course set goals that once I've reached them, they no longer suit my lust for tire annihilation, so I can say what I want now, but I will most probably go custom tune when I'm done with the amateur stuff. Women have purses, we have turbos.

I'd love to see if anybody has some solid #'s regarding the GMS1 and a full bolt on list. And preferably #'s from a Mustang Dynamometer and not a DynoJet. If you know how to work one of those stupid things, you can convince someone that their K&N drop in gave them 43whp.

 

YouTube - 2009 Cobalt SS Dyno
299 335

 

YouTube - Cobalt SS turbo gmpp stage 1 dyno

286 311

 

YouTube - 09 Cobalt SS/TC on the dyno
296 318

 

299 and 335 with a warranty=there is hope haha.

 

Make sura dynos calibrated correctly.. But good job

 

I was waiting for you to post haha. Not me found those on youtube.

 

All three of those videos are GMS1 with mods.

 

I put the stats below them.

 

Yeah but gm wont warranty your car if theres aftermarket lol. And they could find out.

 

Here is a local guy that we did the gms tune, but he installed the sensors. As tthe posts says he fabbed up his own sri and he had a Badmab catless

https://www.cobaltss.net/forums/2-0l...k-dyno-242768/

Hope this helps you out

robk

 

I made 276 whp on GMS1 and 308 whp on Trifecta tune the same day on the Dyno last year this time.

 

Ok well I'm custom BYT tuned, last dyno I had issues with the car as in bad boost leak from BPV but I got 292whp. Well I'm getting the GMS1 sensors soon and getting them installed and then retune by BYT. Mods are all listed. BYT and I are estimating around 315-325whp, possibly more at 24psi!!

 

Seen dyno charts with gms1 alone getting 280hp seems like the dyno numbers on these gms1 kits are all over the map I have seen a 30hp variance, so I guess I won't know until I just get mine on a dyno when I get home.

 

But dont forrget that every dyno is different!! Different areas locations acn play on the car, and different setups and calibrations on the dyno its self can make some differences

robk

 

I found this:

...For example with the gm stage kit uping the power to 290hp that willl be the new learn down spot as opposed to the 260hp spot it's currently at...

https://www.cobaltss.net/forums/3744396-post1.html

And the original (can't link it here..blocked):
Hi all,

A customer who ordered our tune pointed me at this forum and suggested I join it.

Let me take a few moments and explain how this ECM works, and most of the questions here will probably be answered.

In the past, fueling, ignition timing, cam timing, and boost control (when controlled by the ECM) were all controlled by separate tables, and were independent of one another. If you wanted more boost, you changed the tables that controlled the boost solenoid. If you wanted to change the cam timing, you modified the cam timing tables.

With the LNF, it's actually much simpler. You just tell the ECM how much air you want to allow into the engine for a given throttle position, and the ECM adjusts turbo pressure, and cam timing to acheive this target.

This simplicity is also what causes the "learn down" feature. If you do something to the engine that increases air flow, the ECM will eventually discover it is not hitting its air targets any more and will reduce turbo pressure and/or modify cam timing to meet its target again.

Aftermarket tunes (and the GM stage tune) that increase boost do so by raising these air targets. So, the answer to whether "learn down" still exists after a tune is yes and no. Lol. No in the sense the original target 260HP does not exist any longer. Yes in the sense the "learn down" will still learn to the new air targets because "learn down" is how this ECM works. Think of an aftermarket tune as initiating a "learn up".

There has also been some questions raised lately about how adding a bunch of aftermarket parts after the tune has been installed might affect the power levels. I've heard of a couple things happening:

1) After installing some other mods, particularly short ram intakes, the car seemed to lose power, boost became peaky and inconsistent, and in one case started misfiring under load with a flashing CEL. The MAF on the LNF is the centerpeice to *everything*. If any modification causes airflow to change at the MAF it will have far reaching consequences because the ECM uses the MAF to determine if it is hitting its air target. Think of what might happen if there was turbulence at the MAF (varying frequency) - the ECM would see an increasing and decreasing airflow and would attempt to control it by speeding up and slowing down the turbo. Clear Image is still working on their short ram intake because we discovered these issues on the test car, also.

2) Lowered boost levels after intake, boost tubing kit and exhaust components installed. We have not seen this phenomenon either on the dyno or in a datalog yet, but I suspect the modifications are freeing up the engine so it doesn't have to create as much boost to make its air target. This means it is reaching the same amount of power with less boost, which is a really good thing. The bigger question that remains is whether we can make even more power by raising the air targets further. The other possibility is that these parts increased the volume of the intake system after the turbo sufficiently that the turbo is too small to create the same boost pressures as it was able to with the stock components. I suspect it is the former, though. It could be an inaccurate gauge, too. Lol. A recent customer wanted to know why they were hitting less boost than others on CSS - I had him send a datalog, he was hitting precisely 21.9psi despite his gauge saying it was lower.

I'll also add I heard yesterday from a CSS member that one of our Cobalt SS/TC customers did a bunch of dyno testing recently, they hit 294HP corrected with our tune (which is more than what *we* got - Lol), and then 352 HP (SAE correction) with our tune combined with an SRI, boost tubing, and exhaust upgrades. So in this case, the no tune changes were required. We also saw this on the dyno with our test car - we hit an extra 20 HP on the same tune with some exhaust mods.


Comment: With HPT/Trifecta, the tables are moved so far out that the learn down is out of the picture. However,, It still remains to some degree with GM.

 

That is good info. I have read similar write ups. After finally finding several dynos of gms plus mods there is still quite a variance. I think the only way I will know what I am putting out will be to go to the dyno myself when I get home. I would say due to how much money I just spent in parts I will probably get an aftermarket tune to maximize my parts. I was mostly interested in finding what GMS1 maximum capabilities were. It has been shown 299whp is possible with GMS1, so everyone saying it maxes out at 280hp or whatever is simply incorrect. In fact I believe GMS1 has lifted parameters on learn down just like an aftermarket tune. You just aren't maximizing your parts by not tuning specifically. My catless DP could make 5-7hp GMS1 or 20hp aftermarket for example. While I think people underestimate GMS1 obviously aftermarket is the way to go. Now just need to save up some MORE money and buy a pcm to switch out haha. Once you get started with this stuff the money just keeps flowing.

 

I have GMS1, K&N drop in, hahn catted DP, I willing to bet I have about 275 whp, Have not been on a dyno yet. That is th number I have been hearing.

 

How much psi is your gms1 putting out? I would say 275 should be the lowest you would expect. I can't wait to dyno mine and see what it's at. Unfortunately I don't get home until June. If you go to a dyno post your results would love to see them.

 

I still don't understand why some people are so hung up on dyno numbers. They're not accurate and don't reflect your driving capabilities in any way shape or form. As long as you get a baseline and continue to go to the same dyno, you can accurately follow your car's improvements.

 

It's just a measurement. It's exactly like you said stick with the same dyno every time.

 

I was just pointing out that it doesn't matter if it puts down 270 or 290 or gets to that magical 300. Some dynos are optimistic, some are stingy. There's a story I love to tell that applies to how important dyno numbers are.

Last summer, after I had put my car back to stock, I went to the track for some runs. I'm by no means a good at launching this car, but the first run of the night I was paired up against a very loud LS2 GTO. I figured I would get smoked, of course. The tree goes green and I bog my launch a bit, only to notice him spinning wildly. He lets of, gets back on it and proceeds to spin some more. I left him behind and ran a measly 14.3 with a 2.32 60ft. He ran a 14.6. He can over to me after the run and asked what I had done. I told him it was bone stock. He was a bit surprised but didn't seem interested. So of course I asked him what he had done and it was immediately obvious that he had either bought the car as it was or just got done paying someone to do it. He rattled his mod list off (with all the brand names of course) and proceded to tell me it put down 465 at the wheels. He was extremely cocky with the way he described his car and boasted his numbers. I told him his numbers were very impressive, I immediately followed that line up with "my car makes more than 200 less at the wheels than that. Guess we could both work on our driving a bit?" He quickly realized that he was beaten by a substantially less powerful car and told me he needed to work on his driving. His best run of the night was a 13.9 and he lost to a bone stock '06 Mustang GT. But at least his numbers were impressive

PS. With the mods he listed, there's no way in **** he made 465. It wasn't cammed, and no nitrous or boost of any kind.

 

Sweetsandman, yeah that guy was full of it!