Do I have to empty out my gas tank to fill it up with e85?
Oh okay I just got a Wrx 17 and I'm all new to this stuff ..That depends on your tune. If you're running a true flex fuel setup then you can run any mixture of gasoline/ethanol you want. If you're running multiple tunes then you will want to empty your tank as much as possible before filling up and switching maps. You could talk to your tuner about how much you will really need to empty the tank before switching fuel types.
You have to do substantial modifications to run it.
To your average person, that isn't a simple undertaking. You are also forgetting the flex fuel sensor you'll want to have because the quality of e85 in some places is very suspect.
Did you read the hpfp warning at the bottom? That's my only concern on the fa20f because there isn't aftermarket options.
lol.. your sig matches this post perfectlyThe 17 WRX can't at all. The high pressure fuel pump is not e85 comparable and will melt down. There is not an aftermarket unit, and from what I've been reading there likely won't be.
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Yeah the 40-50% seems to be the tipping point for it.It's definitely a concern to take into account. A fuel pump failure could take the engine out along with it.. but at the same time I haven't seen any reported failures from people running <60%.
Depending on the modification level of the modern FA20 WRX, it seems that the fuel system does become an issue when running full 85% ethanol. From what I've read, that's the reason most tuners prefer to use E30 to E60 to power the DI cars.Just curious after reading this thread. We have multiple stations with E85 locally, and I'm wondering if they list the ethanol percentage of the E85 on the pump? I've never really had a reason to read the fine print on E85 pumps. It sounds like 50%-60% is where you want to be if running the WRX on E85, and you probably end up mixing it with 93 to get the correct %?