Nfamous60

iTrader: (11)

hey everyone been reading on here alot bout everyone running e85. are yall just filling up with e85 and getting tuned for it or are you putting half and half and just running the tune you already have stronger? maybe higher boost?. i ask becuz i dnt think our cars are flexfuel so is there any long term effects that running this could have on our cars?

07SSYellow

iTrader: (7)

u have to run the car literally out of gas with 91 then fill it with E85, tune the car then start it, you can't drive it without the tune it will not run correctly. the dudes who run E85/91 mix it to make E47

09CobaltSS1

Yeah an e47 blend is a sweet spot for the cars due to it being quite a bit less strain on the fueling system but has basically the same power potential as straight e85. Alot of guys don't really like messing with blends though simply because it's easier to just pull up to the pump and go. I personally prefer the blend but that's just my preference of course.

Which ever way you go, you MUST be tuned for either straight e85 or whatever blend you decide to go with. The fueling between e10/91octane, e85 and e47 is vastly different. Just dumping e85 in your tank without tuning for it will run the engine EXTREMELY lean and you will be quite the unhappy boy.

Nfamous60

iTrader: (11)

ok i like the E47 blend but do you run the tank empty so you can keep the consistency accurate? maybe im over thinking it a lil bit but i usually fill my car at a 1/4 tank so does that mean add another 1/4 tank e85 and another with 91? **** i might just get a tune for e85 just tryin to get a understanding on it right now .

09CobaltSS1

Basically yes. You really don't need to run the tank empty though. Just be sure to put equal parts of each fuel. It doesn't need to be absolutely accurate down to the ml, but it does need to at least be close.

If you have a 1/4 tank a 91 remaining in the tank just add another 3 gallons or so of 91 to bring your tank to halfway full. Now that you have a 1/2 tank of 91, now all you have to do is top the rest of the tank off with e85 and BOOM, you made yourself e47.

Unfortunately, here comes the sort of complicated part.... although it's still really not all the difficult to calculate.

Different times of the year gas statiosn cary different blends on fuel. I'm sure you've heard the term "winter blend". This holds especially true for e85. For example: right now the ethanol pump that I get my fuel from is currently carriying an e70 blend due to the time of the year. Now by mid-late next month they will be making a transition to e74ish, and then finally by june they should be on a e80-85 blend. Now luckily for you, you live in an area that doesn't swing the blend quite as much as us guys in the north due to the cold. During the winter months I have to do a 2:1 blend to get in my e47 blend range instead of 1:1.

I'll make a simple spread sheet for you (and anyone else who would like it) and post it showing the different blends throughout the country for the different times of the year.

Now that I made it complicated for you again. There ya have it.... lol

09CobaltSS1

Now that I finally figured out how to make a spread sheet work as an attachment on this site, here ya go....

Nfamous60

iTrader: (11)

you the man.

SSlobalt

If you have HPT, there is a configured input for "gals left to full." It tells you have many gallons left to fill up the tank. You just put in half of each to get the many gallons. Without HPT, it's a bit of a guessing game.

klloyd

iTrader: (3)

I always wondered the same thing. I don't have methanol around me but I was always confused on how you mix it compared to what you have left in the tank. I suck at math....

raver0789

Just 5th injector it and life is easy. I found mixing was a pita. Car was fast tho. Lol.

09CobaltSS1

I have HPT as well and I've never had to use it to calculate my mixtures. It's kind of more of a hastle to be honest, when I can just look at the fuel gauge and see that if I'm down to say a 1/4 tank. At that point I know I'll need 9 gallons total of fuel, at a 1/2 tank = 6 gallons, and at 3/4 tank = 3 gallons. That's always put me within a 1/4 gallon or so of where I need to be which is plenty close enough to not throw yours trims all out of whack. Not to mention you don't have to fill it to the absolute top if you don't want.

Not to be a dick but most people don't have access to HPT anyways so it's sort of a moog point though.. Know what I mean?

I'm going to assume you meant ethanol and not methanol.

It's honestly really easy man. The only complication is when they switch back and forth between their winter,spring and summer blends. But even then as long as you keep track of things really it's not a big deal.


The OP doesn't look to be doing a turbo build so the stock fuel system is fine. Doing something like an e47 mix gives you much more headroom for fueling so you never have to worry about pushing the stock fuel system to it's max on even something like a bnr 2871 and even a bit bigger like an efr 6758.