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Old 06-11-2015, 11:19 PM   #1
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E85 conversion

What do I need to swap out to run on flex fuel? I want to be able to run both e85 and 91. It would be nice to be eco friendly in a v8 😄
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Old 06-11-2015, 11:28 PM   #2
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47 lb injectors and a tune for E85. You will have to swap tunes each time you go from 91 to E85, or vice versa.
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Old 06-12-2015, 12:16 AM   #3
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47 lb injectors and a tune for E85. You will have to swap tunes each time you go from 91 to E85, or vice versa.

There's no need to change the fuel pump?
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Old 06-12-2015, 10:58 AM   #4
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Fuel pump is fine. All you need is 47 lb injectors and a tune. Obviously, you'll need a tuner/programer if you don't already have one.

You will also need to perform a couple of data logs so you're tuner can get the tune customized for your particular car.

Good luck!

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Old 06-12-2015, 12:02 PM   #5
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Fuel pump is fine. All you need is 47 lb injectors and a tune. Obviously, you'll need a tuner/programer if you don't already have one.

You will also need to perform a couple of data logs so you're tuner can get the tune customized for your particular car.

Good luck!

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Sick! I thought I would need to change fuel lines as well. Thanks!
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Old 06-12-2015, 12:26 PM   #6
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Anyone have any recommendations on 47lb injectors?
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Old 06-13-2015, 02:22 AM   #7
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Ford racing. Inexpensive and work great.

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Old 06-13-2015, 04:31 PM   #8
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Ford racing. Inexpensive and work great.

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Yeah I'm gonna go with FRPP lu47s. Is e85 corrosive though? Would it cause any other problems like to my lines or plugs?
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Old 06-13-2015, 05:02 PM   #9
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Yeah I'm gonna go with FRPP lu47s. Is e85 corrosive though? Would it cause any other problems like to my lines or plugs?
Nope, you're safe! Just make sure you're running good quality E85, that's all.

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Old 06-13-2015, 05:12 PM   #10
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Lucky y'all. VA only has 1 E85 station... and it's out in Charlottesville.
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Old 06-13-2015, 05:47 PM   #11
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Just don't let your car sit for a long period of time with e85 in the tank. 2+ months.

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Old 06-16-2015, 08:55 PM   #12
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Make sure not to mix the fuels when filling up. You'll need to empty the tank every time you want to change fuels.
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Old 06-16-2015, 11:31 PM   #13
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Sounds good! Thank you everyone for the feedback
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Old 06-20-2015, 01:51 AM   #14
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Any specific benefit to swapping over?


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Old 06-20-2015, 01:57 AM   #15
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Any specific benefit to swapping over?


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Engine runs cooler
Allows for more timing to be added

In a sports car the pros outweigh the cons. Only thing is you use about 30% more so mpg goes down and it's hard to find in some areas.


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Old 06-21-2015, 02:43 PM   #16
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How much more power can you make with a tune over a tune for 91-93?
It seems like if it's that easy replacing the injectors might be worth it.

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Old 06-21-2015, 03:52 PM   #17
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I didn't dyno mine so can't say for sure. Your tuner should be able to look at your datalogs and take a good guess.

Regardless, my exhaust doesn't smell stinky anymore. ...

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Old 06-21-2015, 04:47 PM   #18
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I guess I'm wondering if it's worth the coast of changing the injectors over.
I "eventually" plan on FI so then I know it'd be worth it but what about in the mean time?

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Old 06-21-2015, 04:57 PM   #19
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If e85 is readily available in your area, then switching isn't a big deal.

Most tuners will give you a 93 or 91 octane tune with your e85 tune. So if you're not happy with the corn stuff just switch tunes.

Used 47lb injectors are always on Craigslist. ..I believe they are OEM on GT 500s.


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