E85 help
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This is a discussion on E85 help within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; About what size injectors are best to use, and about how much mpg do you lose for running e85?...

  1. #1
    Registered User
    Join Date
    Mar 2014

    E85 help

    About what size injectors are best to use, and about how much mpg do you lose for running e85?

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  3. #2
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Texas, United States
    I Support ClubWRX I Support ClubWRX
    Injector size is based on your turbo size and other modifications.. e85 takes roughly 1/3 more fuel, so.. 33% larger injectors than you would need for gasoline, and about 33% reduced mileage.. roughly.

  4. #3
    Registered User
    Join Date
    Mar 2012
    Pasadena, MD
    I Support ClubWRX
    If you're on the stock turbo I'd get Injector Dynamics 1000ccs, they are really smooth and most tuners I know love them because they're effortless to tune. They also generally cost the same as 850s depending on what brand you look at and it's always good to have overhead in case you want to throw on a bigger turbo in the future.

    I also see you didn't mention a fuel pump, that will be necessary as well, I went with the Walbro 255 but the DW65c would work as well, you could also go bigger here as well if you're thinking of future upgrades. Just things to think about.

    As far as mileage, I get 170-220ish a tank depending how I drive (2012 STi)...if I take it easy I can probably get 230 maybe a little more but with the extra power I have a hard time keeping my foot off the throttle.

  5. #4
    Registered User chutoyy's Avatar
    Join Date
    Sep 2012
    Sacramento/Orange County
    I'm running Injector Dynamics 1000 and a DW65c fuel pump...

    My car gets 36mpg ACN91 and 18mpg on E85... Freeway miles... Around the city, its about 27mpg/15mpg
    2013 WRX Plasma Blue Pearl

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