Sorry if it's a dumb question, but there's an e85 station right by my house, and my parent's Jeep is a new flexfuel model for that reason, so I've been looking into going the e85 route, but my EVO is my DD, and what would happen exactly if I had to fill up on 93 if I was on Empty with no e85 in sight?

Not that I wouldn't be careful, but I do drive my EVO out of town occasionally so I cant guarantee it wouldn't happen. How dangerous is this?

I imagine once you're tuned for e85, that's it...unless you take the inectors back off, and get it retuned for 93 correct?

 

Drive very cautious and don't go into boost, or get tuned for 93 and then re-flash your ECU with your laptop.

 

you would not have to take the injectors back off. if you had 2 maps, one for e85 and one for 93, you could put the 93 map back in and fill up with pump gas. The tune is not going to be perfect because there may still be a bit of e85 in there, but i would imagine its better than running pump gas on an e85 map. in the case of an emergency, it would be a better option. an e85 tune asks for ~30% more fuel than a pump gas tune. so when you fill up with pump gas on your e85 tune, the car is going to be taking in ~30% more pump gas than it normally does, which would be very rich.

 

well thanks for the replies, I just need to decide if it's worth the commitment of ALWAYS going to the only e85 pump in my area.

 

Map switching.

 

its definatly worth it. ive never had to go back to pump. its not my DD but i do take on some pretty far drives. the shop i go to is about a 60 mile round trip, and my e85 station is about 30 mile round trip. you just have to plan ahead for your drives. il never go back to pump gas. 100 wtq gain from the switch is too good to pass up.

 

flash your car to a gas map

 

Well said sir, you took the words right out of my mouth .

 

I would stay out of boost until you're able to get to some E85 or 93. Plus like everyone else has said, get two maps done.

 

but isn't the only way to switch maps, by having a laptop? thus my problem, I'm a mac guy, mac laptop only, not to mention wouldn't plan on having my laptop in an emergency

 

Click my map switching link above. You can wire up a physical switch into the car to switch between maps using Tephra's "altmap" implementation. No laptop required. And yes, I'm actually using that right now for E85/E10 switching (with sub 0F temps a week or so ago, the car really didn't want to start on E85, so I'm back on 93-octane for a while).

 

I didn't really understand what I was reading from my phone when I checked out your link before, but that's quite an invention! I'll for sure look into it now, thanks so much!

 

I am tuned on E85 and sometimes I have to grab some 92 to make it to the E85 station. I just stay out of boost until I fill up on E85 and I haven't had a problem. I am on AEM EMS and 1400cc injectors so this could be different for others but I wouldn't think so. Your adding more fuel for E85 so if you don't boost you should be fine!

 

Upgrade your stock ECU to the Tephra map switching functionality. This will allow you to run both a gasoline tune and an E85 tune, and simply switch between the two as needed. Here are two descriptive links: Link One and Link Two. And here is the Tephra mod info.

 

hmm good info. im thinking about switching to e85 and the evo is my DD so im contenplating it.