Hey guys I got a 2010 evo x. The car has full bolt ons, all ams parts- intake, intercooler, hot pipe, downpipe, high flow cat and an ETS v2 3" cat back exhaust with a cobb stage 2 93 octane tune off an acessport. I was wondering if I want to tune for e85 what supporting mods do I need- injectors, injector lines, pump etc? And what are the pros and cons for tuning for flex fuel?
Thanks guys

 

alright, so yes you need your bigger injectors, fuel pump, fuel relay, and fuel rail (as far as im concerned).

now..

Pros: you get a lot more power from running flex fuel
the price of e85 is cheaper than pump gas
burns colder so its better for your engine

Cons: MPG goes to the floor
with lower MPG ^^^..you have to fill up more often
not many flex fuel pumps around (depending where you live)

 

I would recommend a surge tank.. there are alot of issues with E-85 and the EVO X mine drops fuel pressure when i get below a 1/4 tank.

 

Injectors and a pump and you are good. Only time i ever got fuel pressure loss was at the track with 0 bars left on fuel gauge making a hard left hand turn

Mileage will go down because you will not be able to keep your foot from hitting the floor because the fun factor goes through the roof on e85. Otherwise its not to bad. Pro's outweigh the cons by far

 

Sorta kinda old thread, but not really. So for the OP and others who may have this question in the future.

I agree with most of what everyone else has said, but I want to elaborate and give my opinion on a few things.

In my opinion, the minimum you'll need is injectors (1000+ cc), fuel pump (255+ lph) and obviously a tune from an EXPERIENCED tuner.

I'd definitely recommend you look into the Blaqops kit.
It includes a fuel pump (they give you a few options), a pump bracket if needed, "E85 safe" replacement pump assembly fuel lines, a synthetic sock filter and an in-line filter that replaces your fuel line under the hood.
It pretty much covers all of the bases and is your "safest" option in my opinion.

Pros:
-Moar powahhhhh!
-No soot on the back of your car
-Smells good
-Moar powahhhhh!
-Cheaper per gallon (most likely not cheaper in the long run though)
-Supposedly better for the environment
-Moar powahhhhh!
Plus a whole bunch of other sciencey stuff that I won't bore you with.

Cons:
-Upfront cost ($800 ish + a tune)
-Your MPG will drop by at least 30%, or more if you're lead footed (hence the debatable long term savings)
-Cold weather start up and low coolant temp driveability (depending on how good your tuner is).
-E85 availability in some areas

I really don't think you need a surge tank, unless you track your car a lot.
If your pump is installed correctly and you drill out the fuel pump assembly return line to the right size, depending on which pump you get, you shouldn't have any siphoning issues when you run low.
I've personally installed 5 of these in the last month and no one has issues.
They can run it until there are no bars left.

You also don't really "need" a fuel rail.
I would probably recommend it if you go bigger than 300lph on your fuel pump, get a surge tank or fuel cell, and are pushing massive injectors.
Then I'd recommend an aftermarket FPR and maybe a fuel rail.

You should already gave a fuel pressure gauge if you're adding bigger pumps and bigger injectors.

 

this thread covered a lot of information i was looking for but i was curious about if i run out of gas and cant find e85 will the tune be able to run on 93 pump or would i need maybe a separate tune on my cobb for emergencies like that?

 

There are two options...
1. Carry a gas can with you
2. Get a dual map tune on your COBB AP

I got a dual map for just that reason... but you need to make sure like you are on the bare minimum... you don;t want to mix 93 with the E85 b/c maybe the car will freak out and not start it will be like E70 or E60 ... So What i do is let my gas lvl indicator go all the way till the blue line disappears then i get gas.