I have a 2006 WT non flex fuel. I filled up with e85 last night, only a few gallons of gasoline left in the tank, I changed the values in all cells stoich for e85. I had to take out 20% from the VE to get to lambda while driving . This morning the cold start was super lean too. I thought all fueling would be adjusted to the stoich change??

 

it could also be that you didnt get true e85. i know here in CA the law states that e85 can be as low as e70, which changes the stoich value considerably. if you are going to make a full time change to e85, i would put an ethanol gauge in the truck that will tell you your ethanol percentage.

depending on what ecu you have in your truck, you might be able to activate the flexfuel aspect of it and have the ecu adjust for ethanol content automatically.

 

I would have to agree with doc350 on the fact that the ethanol content very well may not be 85% but could very well be more like 70%. I have done a lot with "E85" here in my area, I do have an ethanol content test kit and I have yet to see here in my area anything much over the 70% mark when testing various different stations.

 

What did you change stoich to?

 

9.8

Man I'm confused... I may flash the gas tune with closed loop and trims on, right before I put some more gallons in it and drive it for a little while and see if it changes stoich itself, like it would do in a Virtual Flex Fuel Sensor flex-fuel truck. I doubt it, but it has me confused. It litterly seemed like changing the stoich table didn't really do anything.

 

I posted a thread on this forum with a spreadsheet you can use to calculate the stoich based on how much you put it and how much gas was left in the tank. It worked pretty well...

 

Why not put an OS from a virtual flex fuel truck in it?

 

Cause it wouldn't make a difference if he doesn't have the ethanol content sensor in the fuel system from the factory.

 

I already have a 2 bar OS and don't really feel like spending the credits. I looked at a '06 L59, all the same tables except, it would be neat if it was actually enabled on non flex OS's.

Starting sometime in '05 for the '06 models GM switched to virtual flex fuel sensor. There is no physical sensor, it's all in the PCM. It uses the fuel level sensor, purge vent, fuel trims, and probably some mystical crap to determine stoich haha.

 

Ok, let me get this strait... You changed stoich to 9.8 (which should have made you really rich since you're really only have probably E60-65 or so in it since you still had a couple gallons of gas in it. THEN you TOOK 20% OUT of the VE to lean it out and now your lean??? You should try putting your VE back to stock and then try 10.5-11 Stoich and adjusting it up or down till you can get your STFT and LTFT back in line. You will then have to re-adjust it down next time you fill up as you get closer to actual E85.

BTW, You can buy the Cadillac sensor and pig tail off Ebay for about $100 and enable the ethanol tables in your stock tune and have TRUE FF. I just did this with my Cruze. Worked AWESOME!