Incorrect AFR at WOT Help!!

K

kskrew4life

New member
Has anyone else with the unleashed 93 octane 3 bar tune have issues with the AFR readings? I dont have  a CEL or anything else that makes me want to question the condition of my car, but after some data logging Torrie pointed out that there might be a problem with the 02 sensor at bank 2. he said the AFR values at WOT are incorrect. Im not sure what to look for in solving this issue as i see no noticeable difference with the car.

mods
3 bar
motorcraft sp534 gapped at 0.030
 
Edit: I'm running the same tune.


My ltft and stft is always lower on bank 2 for some reason. Never noticed AFR. I'll have to check.
 
Thanks for the response, seems like this will be a PITA to find out. Im not sure how to read these values or what they should be but here is a copy of the log file attached
 
I do see some fuel pressure dropout during WOT, happened twice during the 2 extended WOT sessions, datapoints 16,000 and 25,800 or so.  From 15 at max to around 12 at lowest during WOT.

Interesting the battery voltage never goes above 14V.
 
SHOdded said:
I do see some fuel pressure dropout during WOT, happened twice during the 2 extended WOT sessions, datapoints 16,000 and 25,800 or so.  From 15 at max to around 12 at lowest during WOT.

Interesting the battery voltage never goes above 14V.
Click to expand...



hmmm thanks for pointing that out.. It seems the injectors has the capacity to flow more than the fuel pump can maintain..... probably would cause me to run lean , higher combustion temperature or heat soak. perhaps there is too much boost with this tune. i saw a max of 19 psi... what are others seeing?
 
If those are spikes, you should be OK, better to run under 14-15 psi most times though.  You can have Torrie dial it back.

FRP drop could be just what the tune does before a 2-3 shift, haven't seen that behavior for other gearshifts (from the few logs I have seen).  Could be that the LPFP (intank) fuel pump is an issue here.  Sometimes it is the HPFP (engine bay) fuel pump.  Or it could be the LPFP control module.  OR it could actually be a faulty injector.

Continuing to look through the data ... 
 
kskrew4life said:
SHOdded said:
Excellent idea!  Wait till you feel the SHO has settled back into the stock tune, then datalog.
Click to expand...
One "driving cycle"... About 45 min with varying speeds, etc


How long do you think the ECU takes to relearn after a flash?
Click to expand...
One "drive cycle"... About 45 min surface and freeway mix.
 
Ford puts out a yearly guide that tells you what the drive cycle should be.  I have linked it before on the forum.  Let me see if I can find it.
 
Not sure if this helps, but this is what was posted some time ago here.
9420403cb23d39000e90a62346622ab3.jpg
 
glock-coma said:
Not sure if this helps, but this is what was posted some time ago here.
9420403cb23d39000e90a62346622ab3.jpg
Click to expand...


GREAT Thanks! this will definitely help.. it seems if all steps arnt completed in the same session it gets interrupted and starts over.. i was logging some data earlier.. this probly explains why it looks so screwy.
 
FoMoCoSHO said:
The torque obd drive cycle widget will tell you when its complete iirc....
Click to expand...


I have the Torque OBD app, didnt know there was a drive cycle widget. I will  look that up, that could come in handy whenever i flash a new tune.
 
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