Tune specific for "flex fuel"?

[ecko04]

Do you do look at the E85 sensor input in the jb4? Or is it purely for logging purposes?

I believe I answered this question previously.

As of July, @Terry@BMS was working on auto tuning for E85. It’s not currently available for the consumer versions of the JB4 firmware for the Stinger platform.

By virtue of the modifications I’ve done, I’ve been running v11 of the JB4 firmware since July 24th.

On 8/3, Terry posted on N54 asking if any owners with the Fuel-It Flex Fuel sensor and access to E85 to drop him an email for experimental values to be entered into the JB4 software to allow for auto tuning.

This was something that was only for those with the Flex Fuel sensor and E85, and not for those, like myself that have WMI and the Flex Fuel sensor, as the auto tuning would’ve been way too conservative for WMI (per the email received from Terry).

Autotuning has been something Terry has been working on, but it hasn’t been rolled out yet and therefore, the answer to your inquiry, is that presently the Flex-Fuel sensor does not allow for auto tuning based on the values it generates — unless you reach out to Terry for the experimental values for the JB4, but it’s not automatically available for everyone. At some point I’d imagine this to change, in particular, with CPI, and perhaps WMI as Terry continues to work on the integration.

 

[ecko04]

@Bigjohnb20 what is it that you disagree with?

 

[Bigjohnb20]

It was the part where you said ethanol flows at a higher rate than gas. Maybe just an issue with terminology but they both "flow" at the same rate, it's that ethanol contains lower energy per volume and therefore more is need to make equivalent power. Running high mixtures, especially at higher power will require significant volume demand and over tax the hpfp (as you've accurately stated).
The first time I read through I thought you had made some other comments that weren't correct but reading now not sure what I saw. Carry on

 

[ecko04]

It was the part where you said ethanol flows at a higher rate than gas. Maybe just an issue with terminology but they both "flow" at the same rate, it's that ethanol contains lower energy per volume and therefore more is need to make equivalent power. Running high mixtures, especially at higher power will require significant volume demand and over tax the hpfp (as you've accurately stated).
The first time I read through I thought you had made some other comments that weren't correct but reading now not sure what I saw. Carry on

Correct. Ethanol is about 33% less energy dense compared gasoline and would require larger injectors, and an improved HPFP to run higher ethanol content (without CPI) to deliver more of it to the engine, which still results in the same situation that I described.