Lund e85 vs Lund Flex Fuel

[Agent_Kay]

So, other than the obvious difference of being able to use a mix of different pump fuels for the flex fuel, what's the difference of the two? Do you gain more from the e85 only? If no, why do they offer both if the performance is the same?

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[beefcake]

same tune, but with the ability to adapt fuels ,and add more timing , for more power

let me know if we can help

 

[Agent_Kay]

Ok that's what I thought. I was just curious as to why they even had an option for the two if the flex fuel had more benefits with none of the performance loss. Beefcake, you are just the one I had in mind when pulling the trigger on the nGauge in a couple days

 

[lwnslw]

same tune, but with the ability to adapt fuels ,and add more timing , for more power

let me know if we can help

So the computer will do all of the above with the Flex Fuel tune ?
Im interested in the Flex Fuel but still not sure how it really works on the S550 of being able to go back and forth on different fuels.

On my previous sports car the aftermarket computer needed an E85 sensor to pull that function off.

All info greatly appreciated..

L8R

 

[sicks550]

[MENTION=10926]beefcake[/MENTION] so the bundle you offer with the stage one fore fuel system, ID 1000 injectors and Lund e85 tune makes the same power as the Lund flex fuel tune alone? Or did I miss understand something. I'm looking to get that package and wondering what power gains I would be looking at for the 2,600$ price tag.

 

[cbrtrx]

An e85 tune can offer more gains over a flex tune however the flex tune has obvious advantages as well.

 

[beefcake]

[MENTION=10926]beefcake[/MENTION] so the bundle you offer with the stage one fore fuel system, ID 1000 injectors and Lund e85 tune makes the same power as the Lund flex fuel tune alone? Or did I miss understand something. I'm looking to get that package and wondering what power gains I would be looking at for the 2,600$ price tag.

that package is for supercharged cars

you don't need a fuel system for an n/a car

 

[Jn2]

An e85 tune can offer more gains over a flex tune however the flex tune has obvious advantages as well.

There are ethanol multiplier and modifier tables in the tune that are use when flex fuel is enabled. You can, if everything is written correctly, get the same amount of spark advance and lambda that you would on a e85 tune using a flex fuel tune.

If you are debating on which one to go with, go flex fuel.

 

[cbrtrx]

There are ethanol multiplier and modifier tables in the tune that are use when flex fuel is enabled. You can, if everything is written correctly, get the same amount of spark advance and lambda that you would on a e85 tune using a flex fuel tune.

If you are debating on which one to go with, go flex fuel.

I'm very familiar with the strategy used to determine ethanol content on these cars, it is actually lacking in ways. A true e85 tune could offer more consistent timing under the curve resulting in better gains.

 

[Jn2]

I'm very familiar with the strategy used to determine ethanol content on these cars, it is actually lacking in ways. A true e85 tune could offer more consistent timing under the curve resulting in better gains.

The problem is when you are pushing the limits on a e85 tune, getting it spot on and then on your next fill up you get a e60 fill instead of e85. That's the drawback to a true e85 tune, you must continue to measure the percentage at the pump to make sure you are getting e85.

(Same example as above) With flex fuel you will prob get less spark and lower lambda due to the e60 in the tank compared to what you have for e85, but if you data log at each percentage interval you define, the ECM will run the appropriate spark and lambda value to make max power for that ethanol percentage.

Assuming you always get e85 all the time no questions asked then yeah, a standalone e85 tune would work better Fuel trims will just adjust for the variance in percentage and you may get some KR with lower percentages, you may not, only logging will tell.

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