Yes, this. I must have been on crack last night. Tune the VE/MAF correctly, and then change the stoich value. You can buy a $15 dollar ethanol content tester from jegs/summit so you know exactly how much ethanol is in the tank.

 

I have the VE tables tuned in very well...for gasoline. So it'll be a good starting point

 

change the stoich to 10.463
adjust trims as needed.

 

Will do! Thanks

 

thats on a tank of pump e85 btw. not a mixture.

 

OK well the mixture came out to about %81 ethanol. But I have a problem. With Stoich set to 10.4 the fuel trims are dead on. I opened injector pulse by 4% also. Power is definitely there, but my EGT's are HOT. Cruising at 60-65 they're running 1300 and wot it has hit 1550 but I have quit there in fear of it climbing much higher. Normal gas tune runs about 1150-1200 cruising and only see 1500 towing heavy loads. What is causing the heat?? I was under the impression ethanol burnt colder. Thanks guys

 

Are you turbo'd or still n/a?

Also, get a wideband. With narrowbands you have absolutely no idea what your AFR is at WOT. Just changing stoich isn't adequate, ethanol likes to be significantly richer at WOT than gas (i.e. .78 lambda vs .85 lambda)

 

Also, the ethanol should be cooler. My underhood temps went way down after switching to E85 from gasoline.

 

The truck is back to n/a. Has been for quite a while. I should've updated my SIG, sorry. Anyway the local Dyno has a "tailpipe" wideband that's reading 10.8 cruising, but how accurate are these things that far back in the exhaust?

 

10.8 on the gas or ethanol scale?