Pcmlogger and Flex Fuel

They go by many names, P01, P59, VPW, '0411 etc. Also covering E38 and newer here.
bubba2533
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Re: Pcmlogger and Flex Fuel

Post by bubba2533 »

joukoy wrote:
bubba2533 wrote:Have you changed the delay/transition volume values? They slow down the changing of the flex percent significantly.
All flexfuel tables are direct copy from -04 L59 PCM.
I doubt there is so long delays, they have effect after consumed 36 liters gas?
Yeah, that's not an issue. But some people think they put a little fuel in and cycle the pump to change the flex percent. That will work if you zero the delays out, but if you don't run the engine it will change very slowly.

"All the tables" depends on which XDF you are using. It would probably be better to start with a flex fuel enabled tune that was known working.
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joukoy
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Re: Pcmlogger and Flex Fuel

Post by joukoy »

bubba2533 wrote: It would probably be better to start with a flex fuel enabled tune that was known working.

Maybe this is best method.
Do you know better starting point than this:
http://www.gearhead-efi.com/Fuel-Inject ... 1361631331
For LQ9 + 4l60e 2wd?
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04 Chevy 1500 4x4 MPV L59 12587603.bin
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bubba2533
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Re: Pcmlogger and Flex Fuel

Post by bubba2533 »

I'm not able to open that link, but any factory flex fuel tune should be a good starting point.

You might have a decent amount of work getting everything else where it needs to be, but then you shouldn't have to worry about that part.
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In-Tech
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Re: Pcmlogger and Flex Fuel

Post by In-Tech »

Hiya guys,
Sorry to butt in but am curious about the flex fuel stuff. I have the same concern as bubba. I have a couple guys that would like me to set their vehicles up for flex and am working on it. I changed all the parameters in the calibration and according to the efilive scanner everything seems to work. However, my concern is what if the OS doesn't make it happen? I haven't dyno'd or verified with a wide band YET and am very open to any help or anything I should be watching.
bubba2533
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Re: Pcmlogger and Flex Fuel

Post by bubba2533 »

In-Tech wrote:Hiya guys,
Sorry to butt in but am curious about the flex fuel stuff. I have the same concern as bubba. I have a couple guys that would like me to set their vehicles up for flex and am working on it. I changed all the parameters in the calibration and according to the efilive scanner everything seems to work. However, my concern is what if the OS doesn't make it happen? I haven't dyno'd or verified with a wide band YET and am very open to any help or anything I should be watching.
I have looked at the OS and there are dozens of places that uses flex percent to do a table lookup that HPTuners and EFI Live do not have defined. It would take quite a long time to determine what each one of them does, so it really isn't worth the time when you can start with a tune that already had Flex Fuel enabled.

Sadly my application (V6) never came with flex fuel enabled, so I've enabled it myself. But my vehicle is not my daily driver, so I can deal with some issues until I can figure out what tables need modified.
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In-Tech
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Re: Pcmlogger and Flex Fuel

Post by In-Tech »

bubba, thanks for the reply and all the hard work you have done on this new boost OS. I haven't had a chance to play with it yet but I am looking forward to it.
Over the next few weeks I will be digging deeper into the flex stuff and I will keep you all apprised of what I find. Like you say, it's definitely easier to start with a flex file. As you noted though, sometimes we might want to take an existing file and add flex to it.
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joukoy
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Re: Pcmlogger and Flex Fuel

Post by joukoy »

Found one important table not copied yet:
"B3601 - Ratio of Air to Fuel for Stoichiometry" or "Stoichiometric_Fuel_Air*1mb" in Universal Patcher

I have included patch in latest UniversalPatcher for this, it have currently 30 tables.
https://universalpatcher.net/fill-value ... el-tables/
Will continue testing some day...
In-Tech
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Re: Pcmlogger and Flex Fuel

Post by In-Tech »

Here is a report file from one of the flex fuel files I have via TunerCat. It shows all of the parameters I can change. I don't have the .bin file handy so if you would like that I will "burn" a 'puter and suck it out.
2002_5.3_flexfuel_12116125_Info.txt
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Stokes1114
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Re: Pcmlogger and Flex Fuel

Post by Stokes1114 »

The 6125 os has the exact same flex fuel tables as the 7603 flex fuel. The only one I haven't looked into is a table that has something to do with the cat conv.
In-Tech
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Re: Pcmlogger and Flex Fuel

Post by In-Tech »

Shoot, was just looking through my 7603 files and I don't have a flex fuel file. Can you post this?
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