AFR on the cobalt ss 08...holy sh*T!!

[Denny]

These are in LAMBDA readings

60% load 80% 90% 100%

1.00000 1.00000 1.00000 0.89063
1.00000 1.00000 1.00000 0.89063
1.00000 1.00000 1.00000 0.89063
1.00000 1.00000 1.00000 0.95313
1.00000 1.00000 1.00000 0.95313
1.00000 1.00000 1.00000 0.95313
1.00000 1.00000 1.00000 0.95313
1.00000 1.00000 1.00000 0.95313
1.00000 1.00000 1.00000 0.92969
1.00000 1.00000 1.00000 0.88281
1.00000 1.00000 1.00000 0.86719
1.00000 1.00000 1.00000 0.86719


So if I understandat 100% load which is full boost its running 0.95 - 0.86 LAMBDA which equals to

Examples:
LAMBDA = AFR
0.9375 13.78125
0.90625 13.321875
0.875 12.8625
0.859375 12.6328125
0.84375 12.403125
0.8125 11.94375
0.78125 11.484375

Thats crazy am about to increase boost from 15 PSI to 21 PSI... shouldnt I richen this up by a lot??

[Baldturbofreak.com]

NO! DI runs very differently in it's desired AFR. I run 0.82 @26psi. Any richer you jsut loose power and soot the rear end

[Denny]

NO! DI runs very differently in it's desired AFR. I run 0.82 @26psi. Any richer you jsut loose power and soot the rear end

Ah I see. So what is your recommendation if I want to limit boost at 21PSI?
I was thinking 100% load

0.89063
0.89063
0.89063
0.89063
0.89063
0.85938
0.85938
0.85938
0.85156
0.84375
0.84375
0.84375

[black06g85]

damnit I'm falling behind the times on these cars.... someone local needs to buy one for me to play with

[Denny]

damnit I'm falling behind the times on these cars.... someone local needs to buy one for me to play with

I have just finished tuning my GF 08 turbo SS and all I got to say is WOW... 80F IAT1 and 84F IAT2 at over 21PSI... Am working timing up bit by bit and fuel...so far my first version of my tune is rediculous....this car is going to KILL everything out there!!

[black06g85]

yeah just keep rubbin it in man lol.
Well I have yet to meet a cobalt that can take me out, so my car will stay as it is til that day lol. Then my secret weapon goes in and it's game over lol.

[Denny]

yeah just keep rubbin it in man lol.
Well I have yet to meet a cobalt that can take me out, so my car will stay as it is til that day lol. Then my secret weapon goes in and it's game over lol.

LOL..Paul dont worry the person laughing at the end is my GF ...its her car!! Me am still on my SS/SC pushing meth and a 2.6pulley running hotter then HELL itself.... screw the killer chiller Im going to run my A/C right trew those damn Laminova's and see what happens...if that doesnt cool it down nothing will... ...so yeah!! your the one with the powerfull car man

[boostking]

NO! DI runs very differently in it's desired AFR. I run 0.82 @26psi. Any richer you jsut loose power and soot the rear end

the first dyno run I did with mine was showing high 13's full load almost all the way to redline. I am now running 11.5.1-11.1.1 with 3 degress of timing and I produced the same numbers. my mid range even improved and the car ran 1.5-2lbs of less boost than stock to make the same power. believe me these cars like fuel even though they can run leaner doesn't mean thats the best way. I will be back on the dyno with 23lbs and still commanding about
.75-.79 on monday. will post results

[Denny]

the first dyno run I did with mine was showing high 13's full load almost all the way to redline. I am now running 11.5.1-11.1.1 with 3 degress of timing and I produced the same numbers. my mid range even improved and the car ran 1.5-2lbs of less boost than stock to make the same power. believe me these cars like fuel even though they can run leaner doesn't mean thats the best way. I will be back on the dyno with 23lbs and still commanding about
.75-.79 on monday. will post results

LOl..NICE!!

Me am running

modded it to this:

load 100%

0.92188
0.92188
0.92188
0.92188
0.89844
0.85938
0.84375
0.85938
0.88281
0.89844
0.90625
0.90625

with total 5 degree more of timing.
should be o.k at 21PSI for now.. I dont think my GF wants anymore power then this.

[shabby]

There must be a reason why gm runs it this lean and yet gives you a 5 year warranty on the engine.
Some concrete info on Direct Injection would be nice.

Btw why did you lean it out at the top Denny? If boostking was reading high 13's on the dyno it must of been an inaccurate wideband, because the stock afr is 12.8 and it always runs that no matter what.

[Baldturbofreak.com]

Shabby look at the lambda torque model. GM tells you what AFR best power is made. .9 lamda.

[Chris@HPTuners]

remember more heat is the by product of leaner running. Although these engines make good power a little leaner than traditional (GDI is targetted at lean burning applications), please remember that the PCM also includes complex modelling of exhaust and component temperatures that will richen the fuel if needed to keep things cool. If you disable that feature then beware of sustained high loads melting or weakening something.

If you are getting the same power at a richer mixture then i know what i would choose.

[Baldturbofreak.com]

It is my opinion that it isnt actually running leaner. It's just what data is percieved as. THe DI system waits till the exhaust valve is shut to inject (from what Ive read) even when operation in homogenous charge mode.

the WB is an OXYGEN sensor. If .2L of fresh air goes across the motor during valve overlap and then we burn 1L in a cyl at 12-1 afr can you see how in the exhuast stream it would appear much leaner than what is actually happening in the chamber?

perhaps folks still runnign the stock wheezer should'nt run as lean as I do, I have no CAT and a nice INconel turbine to abuse.

Someone teach me how to do a screenshot and I'll post what's in my latest PE table.

[Bill@HPTuners]

Someone teach me how to do a screenshot and I'll post what's in my latest PE table.

Ask, and yee shall receive Taking a screenshot

[boostking]

It is my opinion that it isnt actually running leaner. It's just what data is percieved as. THe DI system waits till the exhaust valve is shut to inject (from what Ive read) even when operation in homogenous charge mode.

the WB is an OXYGEN sensor. If .2L of fresh air goes across the motor during valve overlap and then we burn 1L in a cyl at 12-1 afr can you see how in the exhuast stream it would appear much leaner than what is actually happening in the chamber?

perhaps folks still runnign the stock wheezer should'nt run as lean as I do, I have no CAT and a nice INconel turbine to abuse.

Someone teach me how to do a screenshot and I'll post what's in my latest PE table.

though your opinion may be correct why run leaner when the car likes a richer a/f. I produced the same power with a richer a/f and less boost. its no question the car wants more fuel.

[Area47]

if i can get someone to send me a damn base file for the ss/t cars id love ya long time


:: pokes denny ::

[PSYKOSTEVO]

These are in LAMBDA readings

60% load 80% 90% 100%

1.00000 1.00000 1.00000 0.89063
1.00000 1.00000 1.00000 0.89063
1.00000 1.00000 1.00000 0.89063
1.00000 1.00000 1.00000 0.95313
1.00000 1.00000 1.00000 0.95313
1.00000 1.00000 1.00000 0.95313
1.00000 1.00000 1.00000 0.95313
1.00000 1.00000 1.00000 0.95313
1.00000 1.00000 1.00000 0.92969
1.00000 1.00000 1.00000 0.88281
1.00000 1.00000 1.00000 0.86719
1.00000 1.00000 1.00000 0.86719


So if I understandat 100% load which is full boost its running 0.95 - 0.86 LAMBDA which equals to

Examples:
LAMBDA = AFR
0.9375 13.78125
0.90625 13.321875
0.875 12.8625
0.859375 12.6328125
0.84375 12.403125
0.8125 11.94375
0.78125 11.484375

Thats crazy am about to increase boost from 15 PSI to 21 PSI... shouldnt I richen this up by a lot??

Ah so these GM guys are finally starting to write code like fords with a Lamda

[PSYKOSTEVO]

if i can get someone to send me a damn base file for the ss/t cars id love ya long time


:: pokes denny ::

You don't have patience do you. I don't have net at home to email it to you right away.

[shabby]

if i can get someone to send me a damn base file for the ss/t cars id love ya long time


:: pokes denny ::

Here you go.

[Chris@HPTuners]

actually this ECM is a german in GM clothing, made by Bosch