Does Flex Fuel make a difference
Elder User
Joined: Feb 2007
Posts: 866
Likes: 1
From: Michigan
Im not sure if the tuners would be the same. I mean I might be wrong but I have heard that E85 robs you of gas mileage and hp so if you put a normal tuner in there its usually set for a certain temp and stuff right? I would think you would need a tuner made for E85 unless you run gas all the time. But Im probably wrong cause Im no mechanic by any means at all.
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,598
Likes: 145
From: SE Georgia
they are the same physically
The only real difference is the fuel filter...but all later 06-08 trucks have it also
Tuning wise, DO NOT RUN E-85 WITH AFTERMARKET TUNES. You'll be okay running tunes as long as you stick with 87/89/91/93 octanes...running E-85 will cause the PCM to shift feul maps and might blow the motor
But yeah, you can run everything on a FFV
Btw, look at you VIN. In the 5th position you'll see either a "5" or a "V".
5=regular 5.4
V=Flex Fuel
The only real difference is the fuel filter...but all later 06-08 trucks have it also
Tuning wise, DO NOT RUN E-85 WITH AFTERMARKET TUNES. You'll be okay running tunes as long as you stick with 87/89/91/93 octanes...running E-85 will cause the PCM to shift feul maps and might blow the motor
But yeah, you can run everything on a FFV
Btw, look at you VIN. In the 5th position you'll see either a "5" or a "V".
5=regular 5.4
V=Flex Fuel
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,598
Likes: 145
From: SE Georgia
I've heard of guys running custom written E-85 tunes though. But I personally would be very leery of that
Give it a try and let us know...but don't be surprised if you get a burnt piston or 2
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Post Fiend
Joined: Nov 2001
Posts: 7,698
Likes: 4
From: Neenah, Wisconsin
Nah...i'm quite happy with my stock 300 hp......it keeps my very very very pricey tires intact better......LOL
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Sick 'n Tired
Joined: May 2006
Posts: 2,969
Likes: 47
From: League City, TX
I've run E85 with my Edge. All the performance of level 3 at a fraction of the unleaded gas efficiency. Other than the crappy mileage I don't have any problems. Given that ETOH is an excellent solvent running a tank every now and then helps keep things clean.
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Senior User
Joined: Mar 2008
Posts: 210
Likes: 0
From: New Orleans, LA
i wasnt planning on running any of the tunes with the flex.
I also read on Wiki that the 5.4 with flex actually had more torque and horse with the stock tunes. I know Wiki can be made up but i was just curious if anyone had the numbers of whether this was true or not. Seems like it makes sense if the computer componsates for the higher octane that Ethanol has.
I also read on Wiki that the 5.4 with flex actually had more torque and horse with the stock tunes. I know Wiki can be made up but i was just curious if anyone had the numbers of whether this was true or not. Seems like it makes sense if the computer componsates for the higher octane that Ethanol has.
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Senior User
Joined: Mar 2008
Posts: 210
Likes: 0
From: New Orleans, LA
ok thats prob what i read
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