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Old 04-19-2016, 12:38 AM   #1
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Default Flex Fuel for MSM

Hey all, built MSM with an EFR6258 @20psi on it, makes 330 on 93, looking to add some extra, and hear E85 is a bit safer as well. I see FM sells the Continental Flex Fuel sensor, and my MS2e has the ability to run flex fuel as Rev told me, but I know there are a few possible limitations.

Walbro 255lph HP, will it be enough?
FIC 775cc Injectors, probably should step up to 1100cc
Fuel Lines, this is a biggie, do I need to replace them

I also see FM makes a Big Flex Fuel kit which I think has a bunch of things that I could do without like the big fuel rail, FPR.

So Miata friends, what is a basic (yet not ghetto), and relatively reliable way to do this for my situation?
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Old 04-19-2016, 10:21 AM   #2
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My NA was around 370whp and the Walbro 255 wasn't enough, at least with stock lines. It just couldn't hold fuel pressure up top. I upgraded to a DW300 and it worked great for me. You'll definitely need more fuel than 775's can flow as well.

I picked up an NB and have similar power goals to you. I just converted the NB to a return system. I pulled the fuel return hardline off my NA when I parted it out. The line popped right in place on my NB. Some people have done a return with the NB evap line but I wasn't comfortable with the tiny line. Once the hardline was in place it's just a matter of swapping a couple hoses at the tank and engine bay. That will give you the ability to raise fuel pressure if needed and use boost referenced fuel pressure.
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