Duty cycle?

I am starting to think my issue is the fact that both banks arent read seperately.  I keep looking through my logs and I see the banks trimming back and forth.  From the pattern I see, it appears one bank enriches, and the other bank leans out.  Sinec they both are getting their readings from the same sensor in the same spot, if one enriches, the richer mixture is also read by the input to the other bank and it leans out. Vice versa.  I have seen this battle go on until one bank is sometime +25% and the other -25%.


 I think my problems are because the enrich and lean out is bank specific, but where its reading from is reading the cummulative AFR. I either need to get my STFT dead on somehow, or figure out a way tell the ecm that its only reading from one sensor. I dont know If I am explaining my thoughts well.

Log from this morning.  Fifth gear, highway speeds.  I made a column that averaged the trims, and highlighted the load and rpm areas that *should*? need the correction.

  

I agree 100%.  What side affects are there not running LTFT?  how do you turn it off, other than in VCDS?

unplug your evap

Current state of tune.  Right now I am dialing in the STFT.  Boost comes on pretty good, still not sure of how to get the N75 to open the VGT open all the way to slow boost.  I actually need to see it in action to confirm.  Boost climbs really fast and does not stop.  I am still trying to figure out the PID.

what maps are you using for you STFT tuning?  whats your techinque for tuning?  please elaborate...

I am using the KFKHFM map to dial in my STFT.

I have been doing several pulls from a low rpm up to about 5500 rpms in several gears, trying to keep the load increasing as steadily as possible.  I also been doing constant rpm/load logs to help me dial it in for my daily commute.  I then take the readings for both banks in block 33, average them together and try to decipher them.  I look for areas that are rich or lean that spreads across a consistent stretch of rpm/load.  I then kind of tweak the highest out of spec cell, and slightly tweak a few surrounding cells to smooth it out.  "rinse and repeat"..

Am I on the right track?  Better way of doing it?  I did it this way when the car was stroker 4cyl with Maestro.  One thing I really miss about Maestro is the historgram.  It was really easy to dial in the fuel since it actually laid your log out over your map, and you can actually see how far off your map was versus how it was running. without having to look at a seperate log and try and trace the load/rpm/STFT.   

Yes the trims have gone down.  I can definately tell the difference in how the car runs.  At idle with the fueling getting dialed in, I have been able to lower the idle speed from ~940rpms back down to a stable 800rpms with minimal misfirin on the Deka 630cc injectors.  

Hard part for me is identifying what is happenning.  I try to do slow gradual pulls to a certain RPM becasue I have noticed that the STFT sometimes dont keep up if I accel to fast.  Usually they will show up as a ~ +10% add on the STFT.  I have to weed all that stuff out, or I will end up chasing my tail.

Also I have to remember to let off the gas completely when I need to decel while logging.  Otherwise the trims have been a bit off and show as a negative.  When I let off the gas all the way it shows up in the logs and sticks out.  

I will have to dig through my logs to show you about where I started, and where I am now STFT wise.  Right now I am dialing in areas that are about 7-9% out, I started with areas that where ~20% out. I am only getting the areas up to about 120 load done right now.  I dont really want to mess with the fueling much past that until I get the boost settled and can make a safe 23-24psi pull farther than 5500rpms.  If I am not careful I can easily peg the boost gage.  It happened last nite, and horrified the crap outta me when I saw the timing pull from that log.  I have since dialed the timing way down in the high load areas to help save my motor just in case.

The Log from last night: