True Flex Fuel Tune

[K4fxd]

@engineermike

Have you played with the fuel volume settings?

I put all the learning parameters back to stock and raised the amount of fuel used to trigger a learn and am now getting very consistent learns.

Gen 2 though

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[engineermike]

I have one trial using the fuel volume parameter. The rest of the tune was using stock f150 values except max learn rate and how I manage the borderline timing adder. What I found was that it still starts learning immediately upon refuel even though there’s no way the fuel volume has been used at that time. I suspect that the volume parameter just delays it from locking in/maturing. This actually makes more sense now that I think about it. Don’t prevent it from learning as soon as it can, just prevent it from maturing. What I did notice is that the alcohol % didn’t budge for the first 2 minutes after refuel.

I’m excited about these new parameters because I have an idea for flex tuning that I believe is ultimately safe but offers all the power of e85. I have once test to run to verify it will work though.

 

[K4fxd]

What I found was that it still starts learning immediately upon refuel even though there’s no way the fuel volume has been used at that time. I suspect that the volume parameter just delays it from locking in/maturing.

This is what I think it is designed to do. It learns the lambda as the fuel mixes in the rails then when the fuel in the rail is 100% the same as the tank triggers a lock.

On the Gen 2 these are populated stock. Fuel line capacity is .5 Lb and volume to mature is 1.5lbs. I raised the fuel line to 1 and volume to mature I set at 2.5. So far it has learned accurately, however I have not torture tested yet.

The other Flex settings I have copied from a 17 F150

 

[mejohn50]

This is what I think it is designed to do. It learns the lambda as the fuel mixes in the rails then when the fuel in the rail is 100% the same as the tank triggers a lock.

On the Gen 2 these are populated stock. Fuel line capacity is .5 Lb and volume to mature is 1.5lbs. I raised the fuel line to 1 and volume to mature I set at 2.5. So far it has learned accurately, however I have not torture tested yet.

The other Flex settings I have copied from a 17 F150

What Mustang strategy has them populated?

 

[K4fxd]

FSGS05A

 

[mejohn50]

FSGS05A

Ah I see. It has a different set of parameters that do the same thing it seems.

auF28820 Flex fuel line capacity
auF28819 Flex fuel meas quantity for AFR update

 

[K4fxd]

Someone asked to see a screenshot of a high learned percent.

Best tank I have got so far this summer.

 

[Rolls]

What Mustang strategy has them populated?

If you post about this on our forum I'll do an export of those parameters from every single stock file we have as csv.

You could then use Excel power query to query them.

 

[ZXMustang]

Someone asked to see a screenshot of a high learned percent.

Best tank I have got so far this summer.

My highest ever on tested e85, shows E77.8. I could never get it higher.

 

[CXRs]

Can someone please explain this like I'm dumb? If I'm understanding correctly, this software(when coupled with a tuner and their flex kit) will enable the ECU to register ethanol content as a value that can be used to reference other tables, correct?

 

[K4fxd]

Can someone please explain this

This software has tables we need to make the flex work on the mustang. Nothing else required.

HP software has missing flex tables that are needed for accurate alcohol learning.

 

[CXRs]

This software has tables we need to make the flex work on the mustang. Nothing else required.

HP software has missing flex tables that are needed for accurate alcohol learning.

Sweet, so no sensor is needed at all?

 

[Rolls]

Sweet, so no sensor is needed at all?

You can use a sensor for a more accurate solution. Or user adjustable, or wait for feedback on how well the oem flex works with the new parameters that are available.

 

[CXRs]

You can use a sensor for a more accurate solution. Or user adjustable, or wait for feedback on how well the oem flex works with the new parameters that are available.

The plan down the road is boost, so a sensor is probably the best way to go with that.

 

[Rolls]

The plan down the road is boost, so a sensor is probably the best way to go with that.

The sensor or user adjustable is the safest, it will lock and run exactly what you tell it to. You can unplug the sensor from the OBD port if you want to be 100% that there is no way it can change.

Benefit of this is you don't have to wait for it to add timing, its instant.

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