Originally Posted by randallsrt

Can't wait till the electronics are mass produced! Someone needs to be funding this.

Originally Posted by cdrinkh2o

Yes this is expected. You will have to enter the extrapolated gas and ethanol injector values because ast has changed the scaling to allow much greater definition (60 - 2500 cc/min with 1 cc/min increments).


BTW - I've figured out why my extrapolated injector values were wrong. It's because ast's code actually uses raw values to interpolate the flexfuel injector scaling value. That means you have to use the raw values in the extrapolation math that ast posted, and not the scaled values.


Let's say your tuned injector scaling value for gasoline (measured at E11) is 1271 cc/min, and for E78 (my measured E85 ethanol content), it's 812 cc/min. You first need to convert these scaled values to their raw values.


For E11, the raw value is calculated by 131*29241/1271=3014
(see InjectorScaling01Mult in the map definition for Ethanol Injector Scaling in the ROM)


For E78, the raw value is calculated by 131*29241/812=4717
(see InjectorScaling01Mult in the map definition for Gasoline Injector Scaling in the ROM)


Now extrapolate the E0 Gasoline RAW injector scaling value from your tuned RAW values:


gasoline_RAW = gas_scaling_RAW+ gasoline_eth_content * (gas_scaling_RAW - eth_scaling_RAW) / (E85_ethanol_content - gasoline_eth_content)


i.e. gasoline_RAW = 3014+11*(3014-4717)/(78-11) = 2734


and the scaled value is;


gasoline = 131*29241/2734 = 1401 cc/min <- this goes in the Gasoline Injector Scaling table


Now extrapolate the E100 Ethanol RAW injector scaling value from your tuned RAW values:


ethanol_RAW = eth_scaling_RAW - (100 - E85_ethanol_content) * (gas_scaling_RAW - eth_scaling_RAW) / (E85_ethanol_content - gasoline_eth_content)


i.e. ethanol_RAW = 4717 - (100-78)*(3014-4717)/(78-11) = 5276


and the scaled value is;


ethanol = 131*29241/5276 = 726 cc/min <- this goes in the Ethanol Injector Scaling table


Once I entered the "correct" extrapolated values and re-flashed 9653E706, my trims settled down to between 1-2%, and WOT pulls showed AFR at expected tuned values again. When using the scaled values to extrapolate the injector scalings I was running 10% or one full AFR too rich.

Originally Posted by ExViTermini

Just to be sure I understand this correctly....

Standard non FF patched rom tuned for pumpgas(that has E content of say 10%) has injector scaling of 1050. After you patch the rom, you cannot put 1050 in there for the scaling as the ecu is assuming the scaling is for 0% E, so you need to convert to raw, extrapolate the data, and find what the scaling would be for 0 E content based off of the 1050 number(and whatever the E scaling is to finish the equation/line plot). Then put that number in there with the E100 number on the other end, so that when running your pumpgas(again, of E10) the ecu interpolates back to the "1050". Sound right?

Originally Posted by FATDAT7

Hey Guys,
I converted over to E85 on the weekend so still have plenty more tuning to do, but the injector scaling is tuned. I have just got my ECA system installed and working. The one remaining thing is to wire it into the ECU (Need to find my ECU pins buried in the garage) Once I have done that I have everything I need to get this flex fuel patch working, I’m in Australia and running the 88580714 V7 ROM. Can anyone give me some pointers on how to go about porting this over to my ROM?

I saw a question about best location for mounting the sensor . See pics below of my setup. In this position I get an accurate reading straight away from start up when sitting overnight, so no issues there. I can take a video if anyone is interested. I also installed a 6 micron (fibreglass) fuelab filter right before the engine.

Attachment 219041

Attachment 219042

Attachment 219043

Also pic of my Zeitronix gauge mounted in the coin tray (RHD).

Attachment 219044

Attachment 219045

I have done a little bit of tuning and even less playing round with XML files, but I would imagine I basically have to find all the addresses for my ROM that the patch needs to reference? Having a system that can take any mix of ethanol sounds like an ideal setup and I'm really keen to get it working!

Originally Posted by ExViTermini

The fittings are pushlock style efi connectors. I would assume you *might* be able to find them at the help section at advance

Originally Posted by cdrinkh2o

I used a couple of these:
http://www.jegs.com/i/Russell/799/64...ductId=1329877

Plus the necessary elbows and adapters to connect to my existing return line.

Originally Posted by wreckleford

Hmm....I'm wondering if I can get something that doesn't require AN fittings. Maybe I will have to raid the used parts places.

EDIT:

ECM Link gave me an option:

http://www.ecmtuning.com/wiki/ethanolsensorparts

Originally Posted by wreckleford

Cheap and cheerful? You from the UK?

I would use rubber hose on the nylon fittings. I may take your advice all the same, it's not much to pay compared to the value of the car

Originally Posted by ExViTermini

Unrelated note, Im contemplating buidling an arduino powered lcd readout for the E content and such, would there be an appreciable effect on the signal to the ecu if I were to tap into it for the arduino?