Pages: [1] 2
Author Topic: Wideband logging using rear O2 sensor inputs?  (Read 27130 times)
Jason
Hero Member
*****

Karma: +38/-0
Offline Offline

Posts: 500


Breaks everything!


« on: May 22, 2011, 10:55:23 AM »

One thing that I've found irritating is that I have no way to log my LC-1's against RPM.

Thinking out loud here but I am wondering if this is possible by wiring the analog outs from my Innovate LC-1's...  Basically disable heater diagnosis, disable secondary correction, and then include the rear O2 voltages (read: wideband analog out) in my logging?

Am I wrong in thinking that the rear O2 inputs are 0-5v?

Logged
julex
Hero Member
*****

Karma: +78/-4
Offline Offline

Posts: 923


« Reply #1 on: May 22, 2011, 05:05:13 PM »

One thing that I've found irritating is that I have no way to log my LC-1's against RPM.

Thinking out loud here but I am wondering if this is possible by wiring the analog outs from my Innovate LC-1's...  Basically disable heater diagnosis, disable secondary correction, and then include the rear O2 voltages (read: wideband analog out) in my logging?

Am I wrong in thinking that the rear O2 inputs are 0-5v?



I don't know about innovative (since I filed is as crap after reading specs and stuff needed for me to get wat I need) but zeitronix can be wired directly to tach input and log RPMs.....
Logged
Jason
Hero Member
*****

Karma: +38/-0
Offline Offline

Posts: 500


Breaks everything!


« Reply #2 on: May 22, 2011, 07:17:11 PM »

It can...  but I have to buy yet another box.  And my under-dash already looks like a Rube Goldberg disaster so I'm hoping to avoid adding more wiring.

Today I ran a wire from the LC1 analog out to the post cat O2 harness, and used an old sensor plug.  I observed that the ECU isn't capable of sensing anything > 1v.

So, I set the LC-1 to output .05v for lambda .5 -> 1.5... ECU sees .049v
I then set the LC-1 to output 1v for lambda .5 -> 1.5... ECU sees .96v

Then I set the LC-1 to output .05v for lambda .5 and 1v for lambda 1.5

So, assuming the LC-1 is linear as people say, I decided I can just use a linear interpolation function for excel when I look at my logs to give AFR reference.

I measured the following voltages in the ECU when the LC-1 read the following AFR's:

AFR: Voltage
18.9 .770v
18.4 .740v
14.3 .485v
11.1 .285v


Using linear interpolation, I interpolated the AFR by measured voltage


AFR: Voltage Interpolated AFR
18.9 .770v 18.98
18.4 .740v 18.49
14.3 .485v 14.37
11.1 .285v 11.14

I am not going to use it as gospel, but it's interesting how it seems to be pretty close.
Logged
Rick
Hero Member
*****

Karma: +62/-4
Offline Offline

Posts: 704


« Reply #3 on: May 23, 2011, 03:13:19 PM »

I use the zeitronix to log RPM, AFR and boost as the ECU is no good with its 1.5 bar boost limit.  I log at the same time as ECUx Smiley
Logged
Jason
Hero Member
*****

Karma: +38/-0
Offline Offline

Posts: 500


Breaks everything!


« Reply #4 on: May 23, 2011, 03:31:51 PM »

I had an interesting thing happen this morning... I was datalogging, and the car fell on its face after shifting to third gear.  Hard.  It was rich to 8:1 or so.

I looked at the log, and it definitely went pig rich.  CF's also went through the roof, which I thought was weird since it wasn't pinging.

Interestingly enough the AFR log from the wideband input looks exactly like KFLBTS_0_A at full load.  So I'm wondering if the wideband input is triggering component protection via TABGBTS? 

Here is the AFR log and KFLBTS_0_A

"calculated" is the default ECUx parameter logged in the "typical" egp floating around.  "Actual" is the wideband logged over the B1S2 input, converted to lambda using linear interpolation.





I'm wondering if I missed a codeword somewhere?  Can the post cat O2 even be used to trigger component protection???
Logged
nyet
Administrator
Hero Member
*****

Karma: +604/-166
Offline Offline

Posts: 12232


WWW
« Reply #5 on: May 23, 2011, 03:37:02 PM »

Simplest explanation is dying EGT.

Didn't see if you logged it...
Logged

ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
Jason
Hero Member
*****

Karma: +38/-0
Offline Offline

Posts: 500


Breaks everything!


« Reply #6 on: May 23, 2011, 03:47:41 PM »

I did... they are 1733 the entire time...

Knock voltages were lower than normal.

Correction factors usually around 3, went up to 9.

Overall timing fell....  and of course engine load was not matching specified load.
Logged
nyet
Administrator
Hero Member
*****

Karma: +604/-166
Offline Offline

Posts: 12232


WWW
« Reply #7 on: May 23, 2011, 03:51:40 PM »

Post up the log, i'll take a look.
Logged

ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
Jason
Hero Member
*****

Karma: +38/-0
Offline Offline

Posts: 500


Breaks everything!


« Reply #8 on: May 23, 2011, 03:57:09 PM »

see attached...

Logged
nyet
Administrator
Hero Member
*****

Karma: +604/-166
Offline Offline

Posts: 12232


WWW
« Reply #9 on: May 23, 2011, 05:13:08 PM »

see attached...
Please send an exported csv so I can view it in ecuxplot Smiley

Not a fan of .xls, I can't parse it into anything useful.
Logged

ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
Jason
Hero Member
*****

Karma: +38/-0
Offline Offline

Posts: 500


Breaks everything!


« Reply #10 on: May 23, 2011, 05:14:24 PM »

I will post up when I get home since my datalogging laptop is in the car Smiley
Logged
Jason
Hero Member
*****

Karma: +38/-0
Offline Offline

Posts: 500


Breaks everything!


« Reply #11 on: May 23, 2011, 05:22:02 PM »

I will post up when I get home since my datalogging laptop is in the car Smiley

Actually, try this, I parsed it back over.  I use excel because I leave the log running and use conditional formatting to identify where I've been WOT.

Logged
nyet
Administrator
Hero Member
*****

Karma: +604/-166
Offline Offline

Posts: 12232


WWW
« Reply #12 on: May 23, 2011, 05:36:24 PM »

Wow. You're right. The only explanation I can see is your wideband input is confusing the ECU, even though it is only on the rears.

Your actual AFR does seem to be following the req. pretty well. Like you said, something is making the ECU want to dump fuel, but I can't figure WHAT except for your rear O2 reading.

I'm guessing it thinks that bank is running super lean .. i forget the posters name, but he said the ECU would do that if it saw lambda > 1 on the narrow bands. I guess it also does it due to the REARS.
« Last Edit: May 23, 2011, 05:46:27 PM by nyet » Logged

ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
Jason
Hero Member
*****

Karma: +38/-0
Offline Offline

Posts: 500


Breaks everything!


« Reply #13 on: May 23, 2011, 06:35:37 PM »

I unplugged the LC-1 and plugged the old sensor back in before I left the office.  I cleared the DTC's to reset the ltft's and whatnot.

Fuel dump went away.  It's about 105 degrees out so these logs are kind of funny.  I attached one with some pretty neato IAT's after sitting in stop and go for a while without any air over the IC's.

nowb.csv shows a third gear pull

loliat.csv shows a 2-3 pull with IAT's hitting 150+

This file is the same file I posted in the tuned files section (tony's Stage 3 + no lift shift antilag) with stock idle torque reserve and stock injector latencies, with KRKTE set to .0650.


edit:  I guess that lends the question, in order to get this to work, do I have to completely disable secondary correction?
« Last Edit: May 23, 2011, 06:37:09 PM by Jason » Logged
nyet
Administrator
Hero Member
*****

Karma: +604/-166
Offline Offline

Posts: 12232


WWW
« Reply #14 on: May 23, 2011, 06:39:16 PM »

do I have to completely disable secondary correction?

My magic 8-ball says "most likely" at this point...
Logged

ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience.
Pages: [1] 2
  Print  
 
Jump to:  

Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Page created in 0.025 seconds with 17 queries. (Pretty URLs adds 0s, 0q)