KLUG'S SS

iTrader: (6)

No not at all, see the thing with widebands and alot of people don't know this is they all use Lambda and it just gets converted into units of AFR for gasoline which can vary from wb to wb but is usually 14.7 but you would have to check with the brand of wideband to make certain.

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?

Black'Rado

iTrader: (8)

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

KLUG'S SS

iTrader: (6)

Their ya go, wasnt aware that you can do that with the LC1 as I am not too familiar with that wideband but doing that should clear up that confusion.


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?

BlackGMC

iTrader: (31)

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%?

KLUG'S SS

iTrader: (6)

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.

dlt76028

iTrader: (13)

Thats some good info Klug. FWIW, most the gas pumps where i'm from just flat out says "contains 10% ethanol".

Black'Rado

iTrader: (8)

Wow that's good info.

So mine is set to 14.12. Would I benifit from changing it? I doubt our stations have a full 10%

Avalanche2002

Holy crap, man, you're more **** than I am! And as far as I'm concerned, that's a good thing.

BlackGMC

iTrader: (31)

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...

dc_justin

iTrader: (13)

Lambda BEN Factor equation using serial input: GM.EQIVRATIO * EXT.WO2LAM1