Data Logs! Post them here.

[steve99]

Originally Posted by DocWalt

True, but considering it was pretty lean at WOT (leaner than I am NA anyway) well before it got to 11.8...

true

if your on oft tune shiv rescales 02 sensor down o 11.25, and wayno tunes rescale it down to 10.2 from memory

shivs tunes tend to run on the rich side, especially lower rpm wot as the stage2 load limits are are to about 1.6 across the whole range. on usa roms C\D, but not on other roms like G

[Wepeel]

Okay, here's something I've been noticing. Posted a thread on it but not many responses there. OFH, OFT 93 Stage 2, Berk catted FP, everything else stock. I notice that during highway cruise my car starts closed loop, commanded AFR/measured AFR starts creeping down and eventually everything goes open loop. You can see in the log where short term fuel trim flatlines at zero and commanded AFR jumps to 15.
http://www.datazap.me/u/wepeel/75-mp...a=1-4-7-8-9-14

Steady cruise at 74 mph. Any ideas?

[steve99]

Originally Posted by Wepeel

Okay, here's something I've been noticing. Posted a thread on it but not many responses there. OFH, OFT 93 Stage 2, Berk catted FP, everything else stock. I notice that during highway cruise my car starts closed loop, commanded AFR/measured AFR starts creeping down and eventually everything goes open loop. You can see in the log where short term fuel trim flatlines at zero and commanded AFR jumps to 15.
http://www.datazap.me/u/wepeel/75-mp...a=1-4-7-8-9-14

Steady cruise at 74 mph. Any ideas?

Have you made any edits on the tune, that rearly weird behaviour
either the car has a hardware problem, or something rearly weird is going on like weird tune corruption.

I would try running a stock rom and see if it does same thing, you will get cel code p0420 ( you culd disable it in stock tune but no need for test) , car wont blow up with catless header on stock tune.
if stock tune is ok then that eliminated problem with car\sensors


the rear o2 sensor is used forcruise fueling adjustment i believe, maybe lg parameter "wideband 02" as that is rear sensor and see it looksok comaed to front sensor, it will be ddifferent as scaling isff but should show if sensor is stuffed.

[Wepeel]

Originally Posted by steve99

Have you made any edits on the tune, that rearly weird behaviour
either the car has a hardware problem, or something rearly weird is going on like weird tune corruption.

I would try running a stock rom and see if it does same thing, you will get cel code p0420 ( you culd disable it in stock tune but no need for test) , car wont blow up with catless header on stock tune.
if stock tune is ok then that eliminated problem with car\sensors


the rear o2 sensor is used forcruise fueling adjustment i believe, maybe lg parameter "wideband 02" as that is rear sensor and see it looksok comaed to front sensor, it will be ddifferent as scaling isff but should show if sensor is stuffed.

Thanks for the response. Yes, weird indeed. I haven't edited the tune in anyway, just the OTS OFT offering.

I will add 'wideband o2' to the log to see what that shows. I will give the stock tune a shot to see what it does. The strange thing is, if I pull over and stop/start the car, the AFR goes back to being normal.

[solidONE]

Originally Posted by Wepeel

Thanks for the response. Yes, weird indeed. I haven't edited the tune in anyway, just the OTS OFT offering.

I will add 'wideband o2' to the log to see what that shows. I will give the stock tune a shot to see what it does. The strange thing is, if I pull over and stop/start the car, the AFR goes back to being normal.

Is it possible you have a faulty O2? Wasnt there a way to log the temperature from the O2 sensor? See if this is happening once the O2 gets heated beyond a certain temperature.

edit: I recall after changing my secondary post cat O2 to a NTK brand part I had more fluctuation in the commanded AFR vs the factory O2 (Denso?). Not sure why it does this exactly as I'd assume commanded AFR is controlled by load and rpm.

[steve99]

Originally Posted by solidONE

Is it possible you have a faulty O2? Wasnt there a way to log the temperature from the O2 sensor? See if this is happening once the O2 gets heated beyond a certain temperature.

edit: I recall after changing my secondary post cat O2 to a NTK brand part I had more fluctuation in the commanded AFR vs the factory O2 (Denso?). Not sure why it does this exactly as I'd assume commanded AFR is controlled by load and rpm.

You can log cat temp with torque or tactrix if you have the ram address ,it uses o2 heater current\voltage to estimate temps think it uses primary o2 sensor though.

I believe the rear 02 is used to adjust cruise fueling , heard it a few times from moto mike and tdd etc, not sure of the excat amount or tables though.

[solidONE]

Originally Posted by steve99

You can log cat temp with torque or tactrix if you have the ram address ,it uses o2 heater current\voltage to estimate temps think it uses primary o2 sensor though.

I believe the rear 02 is used to adjust cruise fueling , heard it a few times from moto mike and tdd etc, not sure of the excat amount or tables though.

That would make sense. I asked the NGK tech at SEMA show about this issue I was having he looked at me like I was crazy... "I swear it has an effect on cruising AFR's"

[Wepeel]

I've monitored Cat temps in torque before, "CatB1S1". Dunno exactly what it was but I know it trended way lower going to a catless UEL from stock (couple hundred degreesF on average).

The Rear O2 going bad seems to make sense... I would think there would be some logic in the ECU that would cause it to 'safe' itself into open loop if it somehow determined an erratic or unreliable rear o2 signal. I will try and check it all out soon - I only take the car out about once a week in the winter. I will definitely report back with my findings.

[solidONE]

Originally Posted by Wepeel

I've monitored Cat temps in torque before, "CatB1S1". Dunno exactly what it was but I know it trended way lower going to a catless UEL from stock (couple hundred degreesF on average).

The Rear O2 going bad seems to make sense... I would think there would be some logic in the ECU that would cause it to 'safe' itself into open loop if it somehow determined an erratic or unreliable rear o2 signal. I will try and check it all out soon - I only take the car out about once a week in the winter. I will definitely report back with my findings.

Since there is nothing there to absorb and radiate heat next to the O2 sensor when you delete the cat, it should be quite normal that its picking up leass heat at the O2.

I was observing my commanded afr numbers just now, and yup it still jumps around at cruising speeds (NTK O2). With the stock post cat O2 the Commanded AFR values would hold steady under steady throttle and load IIRC. I would order a stock O2, but after looking at the price tag compared to the $50 some odd dollars I paid for the NTK part... nah. lol

[Jonathanlim]

Hey guys i'm new to all this. I recently added e85 to my tank and was wondering if this log looked fine to you. Thanks.
http://datazap.me/u/jlim7/local-driv...1?log=0&data=1
http://datazap.me/u/jlim7/highway-cr...1?log=0&data=1

[steve99]

Originally Posted by Jonathanlim

Hey guys i'm new to all this. I recently added e85 to my tank and was wondering if this log looked fine to you. Thanks.
http://datazap.me/u/jlim7/local-driv...1?log=0&data=1
http://datazap.me/u/jlim7/highway-cr...1?log=0&data=1

Looks ok,

Theirs a bit of knock in the highway log. It might just be due to residual petrol in tank if its your first tank of E85, its caused the IAM to drop a little

[steve99]

Originally Posted by Jonathanlim

Might sound like a noob question, but how can you tell if there is knock by looking at the chart?


Sent from my iPhone using Tapatalk

Have a read of the "ECU Logging" link below

Knock Corr (is FBKC Knock Correction)
IAM is ignition advance mulriplier and should be 1, if its less than one you had some knock previously

you should also log FLKC - Fine Learning Knock correction in your logs maybe leave out Short Term fuel trim STFT

[Jonathanlim]

Just curious why would there be knock on the highway and not local? I logged one highway and got off the highway and did another log.

[solidONE]

Originally Posted by Jonathanlim

Just curious why would there be knock on the highway and not local? I logged one highway and got off the highway and did another log.

This engine is prone to knock at engine loads of .6~.8 during low RPM operation.

http://datazap.me/u/jlim7/highway-cr...2194-2390-2742

Look carefully at the data and you will start seeing patterns. Once you recognize these negative patterns you'll learn where you want to make adjustments to try to minimize them. You also want to log FLKC numbers for knock. You're probably getting much more knock correction than you realize since FLKC is not being logged here.