Converting FFV truck into Non-FFV? - TundraTalk.net - Toyota Tundra Discussion Forum
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post #1 of 10 (permalink) Old 03-18-2017, 03:54 PM Thread Starter
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Converting FFV truck into Non-FFV?

Has anyone converted an FFV truck to Non-FFV by swapping any parts related to increasing fuel consumption? I know the parts should be spec'd to resist the effects of E85 and those parts wouldn't be a concern. I read somewhere about the fuel pump being able to supply more pressure, higher flow injectors and different programming in the ECU based on an ethanol sensor. Could the pump be changed to a non-FFV pump? Injectors to standard? Maybe disable the ethanol sensor somehow? I ask because I am annoyed with the fuel economy on my new truck (2016 DC SR5 2WD 5.7L FFV) compared to my old one (2012 DC TRD off-road 2WD 5.7L Non-FFV). Most of the specs between the two trucks are the same (tire size, tow package, etc...), but I'm getting 10%+ lower fuel economy everywhere in the newer truck.

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post #2 of 10 (permalink) Old 03-18-2017, 03:59 PM
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sell it and get a non-ffv


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post #3 of 10 (permalink) Old 03-19-2017, 12:06 PM Thread Starter
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If I sold it I'd probably get something else. I like the Tundra but it is more truck than I really need. My truck previous to the Tundras was a Silverado 1500 double cab with the 4.8L engine and that was plenty. That truck regularly got over 20mpg on the highway. I was able to hit 20mpg with the 2012 Tundra while hauling my KTM 990 Adventure to Colorado a couple years ago. That's hand calculated mpg, not based on the computer. That was even in a couple sections with significant hills. I doubt this 2016 FFV truck could do that based on what I'm seeing in the fuel economy calcs so far, though I haven't had the opportunity to try yet. I still appreciate the bigger tank in the new truck as well as a few of the other changes. I just didn't know the FFV would get different fuel economy on regular fuel. And now I'm surprised that nobody has figured out how to disable the FFV stuff in these trucks.

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post #4 of 10 (permalink) Old 03-19-2017, 12:56 PM
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ffv mileage is not that significantly different than non ffv.
the gen3 trucks do seem to get less mpg than gen2 with less performance to boot!
i have a feeling the new sheetmetal is not as aerodynamic also.
but even a non ffv will not get anywhere near 20mpg at hwy speeds.if you stick to 55 to 65mph maybe.
converting is too involved as ecu,fuel pump,injectors,some wiring harness etc need to be changed.
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post #5 of 10 (permalink) Old 03-19-2017, 01:03 PM
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My 2014 5.7 non-FFV has never got over 15 MPG on the highway..
It averages between 13.6 and 14.2 as my daily driver..

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post #6 of 10 (permalink) Old 03-19-2017, 01:07 PM Thread Starter
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I have definitely noticed that this one seems more rev-happy. The 2012 would keep up with traffic accelerating from a light while keeping the revs down around 2200 rpm. This one seems to like getting up to 2500-3000 rpm. It feels like I'm in a towing mode where it wants to hold a gear rather than shift up to the next higher. It also doesn't seem to lock up the transmission as early.

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post #7 of 10 (permalink) Old 03-19-2017, 05:29 PM
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Converting FFV truck into Non-FFV?

Push the tow hall mode. It changes it dramatically

Last edited by flighht2k5; 03-19-2017 at 05:32 PM.
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post #8 of 10 (permalink) Old 03-19-2017, 05:31 PM Thread Starter
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I have done that. It seems to change the throttle curve. Also seems to hold a gear even longer that way.

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post #9 of 10 (permalink) Old 03-19-2017, 05:32 PM
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Originally Posted by Yardstick View Post
I have done that. It seems to change the throttle curve. Also seems to hold a gear even longer that way.


It livens up the truck a whole lot
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post #10 of 10 (permalink) Old 03-19-2017, 05:53 PM
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There should be a fuel composition sensor that tells the system whether its e85 or non ethanol. Swapping to non ffv parts should not affect mpg.
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