True Flex Fuel Tune

[junits15]

I have some good news for anyone with a flex tune without a sensor.

To keep this short and sweet I had a bad vacuum leak and my car locked onto the correct E%.

I tried several times to make it lock wrong but it always knew the correct %age.

The last test after fixing the leak, was at the pump I pulled the PCV hose and drove away. From what was in the tank and what I added I calculated the E should be 60% It locked in at 63%.

Ford's logic is better than I thought. This is on a gen 2 tuned with PCMtec software.

I’ve heard that it works well in gen2 motors, good to hear you’re having good results!

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[Grimreaper]

@K4fxd what else did you have to tune that wasnt obvious in hpt?

Nice results!

 

[K4fxd]

@Grimreaper

The gen 2 is set up from Ford better than the Gen 3. The Gen 2 has the fuel volume tables populated by Ford. I did tweak some fuel tables that are not available in HP tuners. I believe it would learn within a few percentage points without my tweaks. I just want it to lock in exactly which it does.

I was surprised, happily.

What started this was the car started having drivability problems. It would stall or try to at stop signs and other surging issues. I logged and found fuel trims NEG 25% Yes NEG pulling fuel. I was scratching my head as to what could cause this. A few longer logs showed it adding 10% at idle and pulling 28% at cruise then trending toward 0 as I added throttle. I never went WOT.

After a few days of head scratching I was ready to let a dealer look at it.

I decided to give the motor one more look see, I found a split vacuum line.

I have no idea why a vacuum leak would cause the pulling of fuel, I would think it would add fuel to cover the unmetered air.

Anyway if yours starts adding fuel at cruise look for a leak.

 

[engineermike]

Pcmtec has access to the fuel line volumes in gen3 that aren’t defaulted correctly. Pcmtec also gives you access to starting lost fuel FFV tables that hpt refuses to define.

The only issue with the gen2 flex is that there is no functionality to limit timing or load as a function of ethanol content.

 

[Mustang_tales]

Pcmtec has access to the fuel line volumes in gen3 that aren’t defaulted correctly. Pcmtec also gives you access to starting lost fuel FFV tables that hpt refuses to define.

The only issue with the gen2 flex is that there is no functionality to limit timing or load as a function of ethanol content.

Yes get flex (alt)fuel through pcmtech custom os and never look back.

 

[Rolls]

Not a Mustang but Adam from Tune Plus Inc showing off the user flex fuel (can bus available also) on a Focus RS

https://www.facebook.com/share/v/PcuuY4BX767eqTdo

CANBus flex is available across the board on essentially every 15+ gasoline Ford now.

 

[50BMG]

Not a Mustang but Adam from Tune Plus Inc showing off the user flex fuel (can bus available also) on a Focus RS

https://www.facebook.com/share/v/PcuuY4BX767eqTdo

CANBus flex is available across the board on essentially every 15+ gasoline Ford now.

WoW!
That's pretty cool!
So they have a program that will work for us 5.0L NA cousins now?..

 

[Rolls]

WoW!
That's pretty cool!
So they have a program that will work for us 5.0L NA cousins now?..

Yes CANBus flex fuel is available for all 15-23 Mustangs (with the exception of 15-17 roush calibrations) and 15-20 F150s

21+ F150 support is coming soon as well (multi tune and everything)

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