My Lib is at 230klm, its probably due for new front and rear exhaust sensors.
No cels, just old age, my LV's are not exactly what I'd call stable...
Occasional FLKC and > -5% AF1 corrections...
Staying on top of the relaibility equation, I recently replaced the inlet pipe, TB hose and cyl3 coilpack, leaving new stock plugs and checking exhaust sensors on the to-do soon list.
These are available as genuine items from the dealer for megabucks, from Partsouq for somewhat less, or very affordably via Amazon using the generic Denso part #...
The latter being somewhat of an unkown quantity as regards compatibilty with the postFL EJ255...
This is what I found on Amazon: front a/f 234-9120 rear o2: 234-4732
Its all good swapping parts but I want to be sure of the whats and why's so I asked for some advice on LGT.
I was advised to log the following parameters:
AFR
A/F Learn #1 Fuel Learn LTFT
A/F Correct #1 Fuel Correct STFT
A/F Learn #3
A/F Correct #3
Rear O2 voltage
Rear O2 heater voltage
Rear O2 heater current
CL Fueling Target
All good and I even added these to my btssm using ecu specific custom fields.
However the resulting data is still fairly obscure to me, even after lots of googling.
So instead I used my Tactrix to log a similar spec car with almost similar mods and more importantly the same similar tune, a Throttlehappy 3 boost level SI drive controlled drivability/reliability tune... Dom's 100klm MY08 tbSTi wag.
I'm in the process of dissecting the logs we made, but heres a composite of both cars doing 100kph on the freeway, Doms is iirc on the left, mine on the right.
I'll post links to the full image and logs, and dissect some areas for greater clarity, eg warmup, hitting boost and freeway.
Here's my log, warmup, suburban, freeway:
https://www.dropbox.com/s/bwtlr8ygpsx6w ... 5.csv?dl=0
And Dom's with a similar drive cycle:
https://www.dropbox.com/s/8q2690i97b9l7 ... 7.csv?dl=0
So far I think my sensors may be ok, any advice is most welcome.
In the meantime I'll continue looking for boost/vac leaks and get the new plugs in, before seeking a retune.
Heres a side by side screenshot on the freeway, we're both at 100kph.
https://www.dropbox.com/s/2qqelu9oiz3lf ... y.jpg?dl=0
I forgot to log closed loop fuelling target, so I may reboot the process with that parameter...
Also MegaLogViewer has automatic graph rescaling so a far more accurate view will be gained from editing the logs, which is the next step.
For example I need to remove warmup from Doms log to get like for like scaling of eg AF1 resistance.