Who adjusts thier tune for the 10% or up to 10% ethanol at the pump these days...
#11
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Another part to it as well which can get people is well for starters a Lambda value = 1.00 is stoich for any fuel straight gas, E10, E85 or whatever and what happens is alot of widebands out their will still report 14.7 as stoich on the gauge no matter what fuel you are running at a Lambda = 1.00 because that is how it gets converted and displayed. Follow me?
#12
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You can reprogram the output voltage of the LC1 to read correct for different stioch number.
Once I get my serial to usb adapter I will be doing this so I can log in efi live
Once I get my serial to usb adapter I will be doing this so I can log in efi live
#13
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What I have been doing for quite awhile now is to setup for my scanning and tune is first of all go into the tune of course and set stoich to 14.13, etc... for E10 or whatever fuel and then I setup Lambda in the scanner by defining whatever afr I am using in the tune as a Lambda = 1.00 and then log away and not have to worry about the numbers game using AFR. The nice thing about Lambda is it is very cut and dry meaning that for ANY fuel a Lambda = 1.00 is stoich and also an enrichment value of say Lambda 0.86 for example a naturally aspirated engine is just that 0.86 enrichment and holds true to that number whether you are running straight gas or pure ethanol. See where it really simplifies things?
Last edited by KLUG'S SS; 07-27-2010 at 08:29 PM.
#14
ok, it makes alot of sense but i got another question, why 14.15 or 14.21 or 14.05, when they say it "can" contain up to 10% ethanol, doesn't necessary mean it does... Would it be best to setup the stioch value in the tune for 5% ethanol and let the trims take care of the +/- 5%?
#15
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Bingo! You will here of and see alot of guys just split the difference with an AFR stoich value of around 14.3-14.4. Then you have me on the other hand who is **** and a bit of a perfectionist so I went and actually purchased an ethanol test kit and tested the fuel at many different stations in my area and have seen on average around 5%-7% ethanol in the fuel which works out perfect for a stoichiometric value of around 14.3-14.4.
I havent tested any fuel in my area yet that has actually 10% ethanol in it, it's always been right around the 5-7 percent range.
I havent tested any fuel in my area yet that has actually 10% ethanol in it, it's always been right around the 5-7 percent range.
#18
Bingo! You will here of and see alot of guys just split the difference with an AFR stoich value of around 14.3-14.4. Then you have me on the other hand who is **** and a bit of a perfectionist so I went and actually purchased an ethanol test kit and tested the fuel at many different stations in my area and have seen on average around 5%-7% ethanol in the fuel which works out perfect for a stoichiometric value of around 14.3-14.4.
I havent tested any fuel in my area yet that has actually 10% ethanol in it, it's always been right around the 5-7 percent range.
I havent tested any fuel in my area yet that has actually 10% ethanol in it, it's always been right around the 5-7 percent range.
#19
Ok, some good info in here, i am planning on going back threw my tune (again) using lambda/eqratio to see the affects... I will figure out what stioch value works best afterwards... no i just gotta create a PID that calculates actual vs commanded EQratio...
EDIT: wait, i gotta pick a stioch value to use the GM.EQRATIO PID...
EDIT: wait, i gotta pick a stioch value to use the GM.EQRATIO PID...
Last edited by BlackGMC; 07-27-2010 at 09:13 PM.