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?

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.

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???

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.

see attached...

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

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.

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