View Full Version : E85 without a tune?

04-14-2012, 11:22 PM
Ok, so I've been reading the E85 stuff all day and would like to convert over. can I run it if I don't get a tune for say 1,000 miles? I know the ses light will throw a code and I don't really get into the throttle more than 1/2 at any given time. I mostly drive highway but would like to see how it goes. I alternated tanks in my bird for about 60k miles and put 155k on that engine and still runnng strong. I will get a tune eventually just not possible right now. Also planning other bolt ons so would like to wait till I have those completed for a tune.


04-14-2012, 11:44 PM
it will not run with out a tune it will be to takes 30% more e85 than gas to run.i doubt it would even start

04-15-2012, 12:14 AM
wont work for shit, I run E85 in mine and gas, it wont even make it out of the gas station if I dont load the E85 setup in

04-15-2012, 08:31 AM
Alrighty then, I'll line up a tune first. Thanks gang

04-15-2012, 08:49 AM
I hope your desire to run E85 is a performance advantage and not as a daily driver to "save gas". I have absolutely no experience with fbodies on E85, but I can say that I ran a tank full of E85 in a "flex-fuel" Silverado I once had while on a trip .... the average mileage dropped by 5 mpg for the tankfull via the trip computer on the highway!

I realize it is 104 octane, so those that do run it on occasion, do you have dyno comparisons. I am curious how much more power you can get out it of a "dual-tune" without a build specific to E85.

04-15-2012, 11:43 AM
I wonder if a flex-fuel vehicle increases the timing when you are running the e-85?

04-15-2012, 12:42 PM
i believe they do since it usually takes more timing to burn e85 correctly

04-16-2012, 10:22 PM
I am looking for the performance increase. As opposed to flex fuel vehicles that may not have the high compression we do, milage suffers more. I'd like to get a set of heads that will give a tad higher compression with the ability to add some boost down the line. Not to mention a cleaner fuel and +1 for American made to boot. In all it just seems to be a better choice for my preference. And of couse if we're going to switch, I'd like to get on it to watch the performance from square one per say....

04-16-2012, 10:36 PM
yeah e85 is nice with boost but mpg not so much,im getting 11 city 15.2 highway