AFR Gasoline - E10 Wide Band 02 sensor tuning using Lambda

[EagleMark]

Another bigger issue is a lot of gauges can't be set to Lambda or if your using E fuel which most of us are unless your going out of your way for Non Ethanol or race fuel is:

1. Did you set Stoich or desired AFR in calibration to 14.13?
2. Did you set up the Wide Band Controller to 14.13?
3. Did you get the correct voltages for AD outputs to do conversion in data logger/adx files? Not needed if your run Serial WB to EFI Live V2...

If everything is set to 14.7 and your using fuel that is 14.1? Then your off by .6! You won't know it though because the Wide Band controller is not a wide band controller, it's a Lambda controller. It converts Lambda to AFR because that's what humans want to see. If your in Closed Loop the narrow band O2 sensor is adjusting to Stoich of fuel, Lambda/WB controller is reading stoich/lambda, so the only thing off is your INT/STFT and BLM/LTFT... if you want to get fuel trims close to 0? You have to set everything up right from AFR in bin/calibration and WB/Lambda controller. There's nothing like doing a tune in Open Loop via WB, then going Closed Loop and fuel trims are way off!

[streetperf]

EagleMark,

thanks for all information on E10 and a wide band. I'll have to do some adjusting on my 98 vortec 383. As you stated in one of the threads you don't know the amount of ethanol in your fuel each fill up. Also you don't know where the sweet spot is for your combination.
Again thanks for the info

[delcowizzid]

i tune all fuels with my wideband set as per petrol its just easier.as said above it converts lamda to a/f ratio so the displayed ratio should remain correct.

[RobertISaar]

as long as you understand that 14.7:1 on the controller/display doesn't necessarily mean 14.7:1 to the engine, it's not really a problem. could run straight ethanol and have target AFRs in the 9s in the calibration and 14.7:1 on the display will still mean you're running stoich.

i would prefer for instrumentation to match reality, whenever possible to do so.

[EagleMark]

Lambda is always accurate with any fuel. Bonus to using Lambda data in history tables is it is your multiplier!

[EagleMark]

2014 LT1 Direct Injection Corvette is first GM to come from factory with 14.1 AFR as Stoich!

[RobertISaar]

is there an article from GM or something along the lines? or just someone took apart a factory BIN to find it?