MAJORAHOLE

i'm gonna want to run e85 in my car, but ive heard different things about the tuning.
i did a google and found a few people that still tuned to 12.0-11.5:1 with e85? whats up with that? they said just the lambda changed??

Birdley42008

bump, someday I am going to distill my own 100% ethanol! I need to educate myself!

98vtec

tune to the same AFR as gasoline.

MAJORAHOLE

ive also heard from reputable sources that you tune to 8.7 or some ----

Hitchhikkr

No, the stoich of E85 is around 9.0:1. Your lambda sensor reads oxygen in the exhaust. Two different things.

Tune it simlar to 93oct, if anything it will want to be a bit leaner in the peak torque range than gas.

MAJORAHOLE

thats pretty close to 8.7

t_cel_t

you gotta realize that all the sensor does is sit in the exhaust and when an oxygen molecule hits it an electrical charge is sent to the controller which plots it on a graph/gauge. the gauge you have will be ideal for gasoline but the amount of oxygen you want in the exhaust is the same.

Hitchhikkr

^^^this is what I was trying to say, sorry. :P

MAJORAHOLE

so your saying tune it to 12:1 in boost just like 93? i'll just have to add fuel from my stock map right?

98vtec

yes.

it will take approx 30-40% more fuel to meet the same AFR as gasoline so far as I have been told from a couple tuners