GM STAGE 2 tune - Page 2 - Cobalt SS Network

2.0L LSJ Performance Tech 205hp Supercharged SS tuner version. 200 lb-ft of torque.

GM STAGE 2 tune

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Old 11-03-2017, 03:01 PM
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Originally Posted by Johnny Bliss View Post
It might make more power up top with a 2.9 pully but less torque down low I'm guessing

I'm also assuming the kncock sensor is taking timing out when the injectors max out causing a drop in power at high rpm. But honestly I don't feel the power fall off at all up to 7200 I've never watched the timing advance closely at the top of any gear. Might try that sometime when the roads are dry
I would at least get a wideband, I'm betting it's going lean up top. Using the butt dyno isn't the most reliable method for power loss. Timing will slowly decease with load and rpm.
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Old 11-03-2017, 03:09 PM
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with an aftermarket tune and a modded car, your driveability, NVH is never going to be perfect. Theres always going to be weird quirks or small things that happen. If you want perfect drivability and NVH you would need to buy a new car. Or spend days or weeks of seat time tweaking every piece of your tune, which is a waste of time IMO.
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Old 11-03-2017, 03:13 PM
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Originally Posted by Slowbalt2000 View Post
with an aftermarket tune and a modded car, your driveability, NVH is never going to be perfect. Theres always going to be weird quirks or small things that happen. If you want perfect drivability and NVH you would need to buy a new car. Or spend days or weeks of seat time tweaking every piece of your tune, which is a waste of time IMO.
Totally is worth the seat time to get it dialed in.
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Old 11-03-2017, 03:18 PM
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Totally agree... even more fun when you have an Auto to tune
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Old 11-03-2017, 03:28 PM
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Originally Posted by ECaulk View Post
Totally is worth the seat time to get it dialed in.
I always find my self wanting to do that but when I actually sit in the car, I spend a few hours ******* with the basics and it runs good enough so i generally just leave it.
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Old 11-03-2017, 03:39 PM
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Originally Posted by Slowbalt2000 View Post
I always find my self wanting to do that but when I actually sit in the car, I spend a few hours ******* with the basics and it runs good enough so i generally just leave it.
That's how it started for me, then I started logging my drive to and from work and making little tweeks, I usually make small adjustments every spring and fall in part to help with traction for winter and the idle load is different and the lnf is stupid for idle tuning, still have a little more to get it to hold timing perfect (still bounces 1-3degrees)
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Old 11-03-2017, 03:41 PM
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Originally Posted by Johnny Bliss View Post
Super lazy too.

Other platforms have free software, or carb tuning on other boosy projects... Or at least cheaper tuning software. Hptuners just has the market cornered with gm products I guess so the price is high
There is another tuning software but it's more expensive
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Old 11-03-2017, 03:51 PM
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hptuners is ridiculously cheap for what youre getting...

Oem level software costs $50k+
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Old 11-03-2017, 03:55 PM
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Originally Posted by ECaulk View Post
That's how it started for me, then I started logging my drive to and from work and making little tweeks, I usually make small adjustments every spring and fall in part to help with traction for winter and the idle load is different and the lnf is stupid for idle tuning, still have a little more to get it to hold timing perfect (still bounces 1-3degrees)
ive always wanted to do stuff with cam timing, playing with small things like that.

Calibration is literally a full time job, so doing it myself in my free time, it doesnt really get the attention that it would at the oem level. Thats why I say it will never be exactly perfect. We dont have the equipment available to us(mostly due to cost) to create a perfect aftermarket calibration.

Ive been looking into buying a cylinder pressure sensor but the analyzer is 8500 and the spark plug/pressure sensor is over $5000
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Old 11-03-2017, 04:13 PM
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Originally Posted by Slowbalt2000 View Post
ive always wanted to do stuff with cam timing, playing with small things like that.

Calibration is literally a full time job, so doing it myself in my free time, it doesnt really get the attention that it would at the oem level. Thats why I say it will never be exactly perfect. We dont have the equipment available to us(mostly due to cost) to create a perfect aftermarket calibration.

Ive been looking into buying a cylinder pressure sensor but the analyzer is 8500 and the spark plug/pressure sensor is over $5000
Not perfect but perfect for your driving style.

The spark plug/pressure sensor/thermocouple would be an amazing purchase for getting things dialed in for road track use.
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Old 11-12-2017, 08:31 PM
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I went out put a new maf sensor on and when I took the nut off the bracket the housing fell off... I forgot to tighten the hose clamp behind the maf....lol

I out the new maf sensor in anyways.


Seems to run really nice now. No more hesitation betweens shifts... For now
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Old 11-12-2017, 09:56 PM
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Something is def wrong with the car.
I tried to read the comments and seems like your an idiot. Just being brutally honest. Also some info is missing or deleted.
Either way a real GMS2 does not do all the stuff going on there. If memory serves. A real GMS2 tune was using stock header and stock downpipe. Anything added after that affects it. The pulley is a 77.9mm or a 3.0-3.1. Something like that. Reliability was high on that tune as well. I read somewhere header and eBay cat or some ****.
If your thinking HP Tuner is expensive I can only imagine how much you would complain to get a Baja tune or a SCT to load up a MPT tune
hptuners are sold left and right for 350$. 350$ barely buys a cold air intake nowadays.
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Old 11-12-2017, 10:26 PM
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Nothing is wrong with it it had a air leak in the intake behind the maf

Runs smooth now.
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Old 11-13-2017, 12:34 AM
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did you remember to refill your blinker fluid when it was all said n done

Last edited by bahoodle; 11-13-2017 at 12:55 AM.
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Old 11-13-2017, 11:59 AM
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No but I did change the muffler bearings when I did the top end. So it should be good for this winter at least
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Old 11-27-2017, 07:31 PM
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been looking at timing at WOT. with the 2.7 pulley i've seen it anywhere between 13-18. seems pretty conservative. but im ok with it esp w/ the pulley size
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