08-10 SS Turbocharged General Discussion Discuss the 2008 - 2009 Chevy Cobalt SS Turbocharged. On sale since the second quarter of 2008.

E10 and 0.87 Lambda

Old Jul 12, 2010 | 02:45 PM
  #76  
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Is any of this even relevant since our cars have factory widebands? They measure for lambda, not AFR.
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Old Jul 12, 2010 | 05:19 PM
  #77  
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So changing the lambda doesn't change the AFR? lol...

Tested out the .83 on the way home.

23psi @ .88 lambda got me ~4.5 seconds from 60-100
23psi @ .83 lambda was 4.7 seconds on the nose 60-100.

This doesn't mean anything one way or another, and I didn't change a thing other then the Lamba value and then adjust the trims for it. The car will vary slightly on the 60-100 times depending on weather and maybe even just the day LOL! So Im going to run it like this for the week taking times and see what the best I can do is on .83.

Last edited by BYT*SS*TURBO; Jul 12, 2010 at 05:19 PM. Reason: Automerged Doublepost
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Old Jul 12, 2010 | 05:35 PM
  #78  
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From: newburgh,ny
Originally Posted by BYT*SS*TURBO
So changing the lambda doesn't change the AFR? lol...

Tested out the .83 on the way home.

23psi @ .88 lambda got me ~4.5 seconds from 60-100
23psi @ .83 lambda was 4.7 seconds on the nose 60-100.

This doesn't mean anything one way or another, and I didn't change a thing other then the Lamba value and then adjust the trims for it. The car will vary slightly on the 60-100 times depending on weather and maybe even just the day LOL! So Im going to run it like this for the week taking times and see what the best I can do is on .83.
interesting good to see you're doing the test from the other side of the crowd..
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Old Jul 12, 2010 | 05:37 PM
  #79  
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Originally Posted by BYT*SS*TURBO
So changing the lambda doesn't change the AFR? lol...

Tested out the .83 on the way home.

23psi @ .88 lambda got me ~4.5 seconds from 60-100
23psi @ .83 lambda was 4.7 seconds on the nose 60-100.

This doesn't mean anything one way or another, and I didn't change a thing other then the Lamba value and then adjust the trims for it. The car will vary slightly on the 60-100 times depending on weather and maybe even just the day LOL! So Im going to run it like this for the week taking times and see what the best I can do is on .83.
Ok..pretty close. I wouldn't expect more power with lower AFR at WOT anyway...BUT..could be safer for sure. It would be nice to see what EGTs were.
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Old Jul 12, 2010 | 05:50 PM
  #80  
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From: Tejas
Originally Posted by Wangspeed
Is any of this even relevant since our cars have factory widebands? They measure for lambda, not AFR.
AFR is Lambda, just expressed differently.

https://www.cobaltss.net/forums/show...3&postcount=58
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Old Jul 12, 2010 | 06:25 PM
  #81  
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From: Dark side of the Moon
Originally Posted by ronn
Ok..pretty close. I wouldn't expect more power with lower AFR at WOT anyway...BUT..could be safer for sure. It would be nice to see what EGTs were.
Our EGT's are calculated estimates so I doubt it would mean much.

Last edited by Iam Broke; Jul 13, 2010 at 05:55 AM.
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Old Jul 13, 2010 | 12:05 AM
  #82  
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From: O Fallon, MO
I am running a .87 ~ .88 on my car currently and it seems to run best around there. I haven't had time to perfect my timing yet, but I am running 12~13 up top currently with no problems.
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Old Jul 13, 2010 | 12:10 AM
  #83  
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From: Still fixing others mistakes.
Originally Posted by peachpuff
Im sure gm took into account e10 when deciding on the afr for the lnf, its not like e10 just came out.
people need to read this. they do take it into account.
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Old Jul 13, 2010 | 12:21 AM
  #84  
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From: Fond Du Lac, WI
Originally Posted by Stamina
I wonder if he's running that Cali E15 mix that LS1fbody mentioned.





Y'all got me wondering:

Ethanol also allows for more timing by nature, so I wonder how much more timing can be realistically gained by running E10 vs straight 91/93 Octane gas.
Careful, the ethanol is used to raise octane, more timing is not warranted because there is more ethanol, you'll ping just the same as you would otherwise at the same octane.
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Old Jul 13, 2010 | 01:30 AM
  #85  
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From: Tejas
Originally Posted by army_greywolf
Careful, the ethanol is used to raise octane, more timing is not warranted because there is more ethanol, you'll ping just the same as you would otherwise at the same octane.
ah ok
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