Lund flex fuel tune - how reliable is it?

[Bluemustang]

Strongly considering a Lund FF tune. Only have a JLT and a catback. My question is- how reliable is it? How often do you have to datalog? I want a tune that's just plug and play. Do you usually have to datalog it or do they usually come good to go?

How easily can you switch back from 93 and E85? Any problem running E85 in cold weather? So many questions lol.

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[GSLSE20B]

the flex maps are great . you can run any combination of e85 and gasoline you want . in the really cold season you will probably run more gasoline than ethanol .

 

[DarkestHour]

You can switch but don't pound on it until learning process finishes adjusting for your alcohol content.

 

[TheDivaDanielle]

datalog once and you're done. you can freely mix fuels just like you can mix 87 octane and 93. To your hearts content.

 

[UPRSteve]

A rock solid tune. I swap back and forth in my personal 15 all the time. Always good to check with the a log and with the ngauge, its really easy to do it. Takes no time.

 

[MaskedRacerX]

Let me ask about my use case:

Not a daily driver, finding 93 in Florida is zero issue, however, most of my travels (my operating radius is about 10 miles ) don't take me near any E85, but I might occasionally go get some.

1) Is there any downside other than cost (if I'm reading correctly the Flex option is an additional $150) - or point for that matter - to having a tune that accommodates E85 if you rarely use it?

2) Does a "standard", non-Flex tune accommodate moving between gasoline octanes, i.e., 87, 89 and 93? (this is more for the occasional road trip out of Florida)

Thanks!

 

[TheDivaDanielle]

1) No, it just gives you more options and availability to make more power

2) Yes and No. you're gonna wanna stick with 91 octane minimum here. it is after all, a performance tune, not a catch all, even weak gas tune.

 

[GSLSE20B]

Let me ask about my use case:

Not a daily driver, finding 93 in Florida is zero issue, however, most of my travels (my operating radius is about 10 miles ) don't take me near any E85, but I might occasionally go get some.

1) Is there any downside other than cost (if I'm reading correctly the Flex option is an additional $150) - or point for that matter - to having a tune that accommodates E85 if you rarely use it?

2) Does a "standard", non-Flex tune accommodate moving between gasoline octanes, i.e., 87, 89 and 93? (this is more for the occasional road trip out of Florida)

Thanks!

If you get the flextune , ask for a 91 base file . Then if you get some "bad gas" your car will run fine . The tune will always add timing when it can .

 

[MaskedRacerX]

Awesome, thanks folks, I thought that was the case, but figured I'd ask in this [relevant] thread.

Getting ready for a _tune_!

 

[Sasuketr]

If you get the flextune , ask for a 91 base file . Then if you get some "bad gas" your car will run fine . The tune will always add timing when it can .

I received this tune but havent had a chance to load it. There was no base octane rating in the order options. Is this a separate request? Wouldn't the base come in as 87 octane since thats what the manual and ford says to use.

 

[stoli]

The flex tune is good for basically any fuel though you should stick to 91 and up. You can have the nGauge display when it has 'learned' the new fuel after each fill-up or just assume 5-10 minutes of driving if you don't want the gauge plugged in all the time.

 

[Bluemustang]

I'd be interested to understand how it actually works. If this adaptive fuel logic is already in the stock ECU, then why are there 87, 91, and 93 specific tunes? It must be something in the tune that unlocks this capability to adjust timing and other things based what fuel is being used. I know that the stock ECU has adaptive learning but I don't quite understand how that actually works. I wonder what would happen if you put E85 in a bone stock car? What would happen? I would never try this but just curious to know more.

 

[Terminator2]

I'd be interested to understand how it actually works. If this adaptive fuel logic is already in the stock ECU, then why are there 87, 91, and 93 specific tunes? It must be something in the tune that unlocks this capability to adjust timing and other things based what fuel is being used. I know that the stock ECU has adaptive learning but I don't quite understand how that actually works. I wonder what would happen if you put E85 in a bone stock car? What would happen? I would never try this but just curious to know more.

Flex fuel logic is not enabled in the stock tune although it is coded into the ECM. You turn it on via tuning and it allows adaptive learning of ethanol content and adjusts stoich a/f and timing based of ethanol content.

 

[Sasuketr]

I'd be interested to understand how it actually works. If this adaptive fuel logic is already in the stock ECU, then why are there 87, 91, and 93 specific tunes? It must be something in the tune that unlocks this capability to adjust timing and other things based what fuel is being used. I know that the stock ECU has adaptive learning but I don't quite understand how that actually works. I wonder what would happen if you put E85 in a bone stock car? What would happen? I would never try this but just curious to know more.

What my understanding is that the stock ecu programming logic may not have the adjusted interval for the ethanol content. So if the concentration does not fall in that interval, the car may crank at first which would take some time and then it will shut off due to a safety protocol written in the programming logic. The flex fuel tune overrites the interval and extends it to a certain limit. It will adjust the timing for whatever type of fuel you have in the system. Its like the stock ecu adaptation for different fuel types but this time you have more fuel options. Also keep in mind that the lund tune is more aggressive than the stock tune even on 87, 91, and 93 octane.

Simpe thinking would be you have lets say 7 poly functions loaded in the logic and saved versus 3. And each function is programmed to give you advance timing with the met requirements.

 

[Bluemustang]

Thanks guys. I think I'm going for it. Does Lund still work with SCT?

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