Lund flex fuel programming?

[BlackGT]

I have been reading about the NA cars having a tune from Lund for E85, how long will it be before it makes it over to the SC cars? Another question, will the flex fuel tune be as aggressive as a dedicated E85 tune?

Just questions in my head.

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[sonic]

Lund has been tuning E85 forced induction for a while now .. That's nothing new

 

[evo8904]

The flex fuel tune seems like a cool idea. I like being able to run whatever fuel you want and the computer being able to adjust. I think that we will definitely see a flex fuel tune for FI in the next few months.

 

[BlackGT]

Lund has been tuning E85 forced induction for a while now .. That's nothing new

I'm aware of the dedicated E85 turns, it is the flex tunes I was asking about. I wouldn't want to run E85 all the time, too many fill ups.

 

[sonic]

Flex fuel =E85 as far as I understood? Am I wrong?

 

[Jewishthunder]

Flex fuel =E85 as far as I understood? Am I wrong?

Differences are that with what everyone is calling flexfuel, you can either run 91/93 or e85 and the ecu will adapt. Lund right now has a straight e85 tune for blown cars, or at least they've done that tune before.

The tunes people are talking about are the "new" flex fuel tunes that allow you to run a mix of gasses or one or the other and the ecu will sense and adapt timing to safely run it.

The problem you run into with flex fuel on boosted cars is that the demand for fuel is so much higher under 10+psi than a stock car, that you need quite a bit more fuel pressure/volume. You usually would want to run a bigger/double pump and return system, plus much bigger injectors. Seeing how that would run on 91/93 would be interesting. I love the idea of flex fuel, since I have two e85 pumps close to me, but it's gotta be really dialed in for boosted cars.

 

[BlackGT]

^^^ This is exactly my concerns. I figured the programming would be much different because of the fuel demands.

 

[Process]

This is how it works, if you are running straight E85, it will be just like the normal E85 tune. If you are running straight 93, it will just be like the normal 93 tune.

There is a strategy in the PCM, that is native to the F150. The F150 also uses the coyote engine and tricor PCM. These tables inside the strategy in the pcm are disabled for the Mustang, but some of the aftermarket software companies have re-enabled this strategy,

Essentially today you have a myriad of fueling and timing tables, but it is only modeled to one fuel type. In this flex fuel strategy you also add a set of fueling and timing tables for alcohol. When the widebands see a swing in trims, they will adapt and average the stoich value, and find an average for fueling. It will do the same thing between your gasoline and alcohol tables for timing.

Essentially the values will be set to assume 100% ethanol, and 100% gasoline, and your actual result will be the average of the content % of what is in your gas tank.

 

[sonic]

Thanks for the information ^ so is it safe to assume that's it's best to run separate tunes for real performance ?

 

[Process]

Thanks for the information ^ so is it safe to assume that's it's best to run separate tunes for real performance ?

Thats not what I said at all. It's the same performance.

 

[sonic]

Ok I understand now thank you..

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