How are you logging your wideband??? MMCD

[DrGonzo]

I currently have my AEM WB connected to the EGRT input on my stock ECU. When I run MMCD it is displaying the WB reading correctly and everything works great. The problem I am running into is when I export the file using MMCD Tools it shows EGRT in degrees and not WB readings??? EGRT is gone so I'm guessing is is converting the WB readings into degrees.

Anyone have any ideas why it would be doing this or how to fix this?

What other ways is everyone logging their WB? HHH??

Here is an example of my last log:

http://3s.gonzoinc.com/albums/userpi...-02-06_Run.xls

[RL7]

I use a formula to convert it in the spreadsheet. For me its =2*([cell]/51)+10. My wideband is 10-20. If yours is 8-22 (as MMCD 1.8 is set to display while running) it would be =2.75*([cell]/51)+8.

[DrGonzo]

That gives me the same WB readings as the formula I got from bboyalan on the other site. =SUM(([cell] * 0.03921569) + 10)

with either of those equations my WB is nowhere close to what my stock O2's are reading

Example:

O2-f     O2-R      WBO   TPS
0.70V   0.35V      16.8	  41.6%
0.88V   0.88V      16.1   48.2%
0.92V   0.94V      16.0   48.2%
0.94V   0.94V      15.8   47.8%
0.94V   0.94V      15.8   47.1%
0.96V   0.94V      15.6   47.1%
0.96V   0.94V      15.5   47.1%
0.96V   0.96V      15.0   46.3%
0.96V   0.96V      15.0   45.1%
0.96V   0.96V      15.1   44.3%

Narrow band O2's are reading rich but WB is a little lean

Here they are a little closer but still off!

O2-f           O2-R         WBO        TPS
0.90V	        0.90V	    15.3	27.8%
0.90V	        0.90V	    12.7	28.6%
0.92V	        0.92V	    11.6	29.0%
0.92V	        0.92V	    12.4	29.0%
0.92V	        0.92V	    13.8	27.8%
0.92V	        0.92V	    15.6	27.5%
0.94V	        0.96V	    14.8	20.8%
0.94V	        0.88V	    14.0	20.4%
0.88V	        0.60V	    14.0	20.4%
0.86V	        0.92V	    14.0	18.4%

AEM WB is located in the y collector of the DP.

Could it be due to the distance of the stock O2's in comparison to the WB or is the conversion not correct?

I'm also wondering if my front O2 is going bad considering the major differences between the front and rear banks at times. The rear was just replaced as it was bad.

[DrGonzo]

Ooops I was using the wrong equation. I used the one for 10-20 but should have used the one for 8-22.

Now the WB values are withing the correct range but they are still way off from what the narrowband is reading! WTF is going on.....

KNCK	INJP	O2-F	O2-R	WBO	TPS


7	16.90ms	0.84V	0.94V	15.4	57.6%
7	15.87ms	0.94V	0.96V	20.1	64.3%
7	14.85ms	0.94V	0.96V	20.1	55.3%
6	14.85ms	0.94V	0.96V	20.1	47.5%
6	15.36ms	0.96V	0.96V	20.1	42.0%
6	15.87ms	0.94V	0.96V	19.5	41.2%
5	16.38ms	0.96V	0.96V	16.9	40.8%
5	15.62ms	0.96V	0.96V	17.2	40.0%
5	16.13ms	0.96V	0.96V	13.1	40.4%

Maybe I am mis-understanding this but the higher the narrowband voltage the richer the fuel correct! So 0.94v RICH on the narrowband but 20.1 LEAN on the WB. Am I ass backwards on this???

Anyone have any ideas here?

[RL7]

Is this the trend everywhere? The narroband data may just be garbage when the car is running in open loop.

[DrGonzo]

Yeah it is pretty consistent across the board with the NB not matching up with the WB!

I'll have to take a better look at the logs and see how they look under load/acceleration VS cruising. I completely forgot about the whole Open/closed loop operation.

I would still figure even if the O2's are being ignored they should be about the same range as the WB seeing as they are still sending data to the logger. I mean 'rich is rich' and 'lean is lean' regardless of what the ECU is doing with the data. Right???

[RL7]

I would just richen the crap out of everything for a run and see what it does to the readings. If your wideband is reading in the 10-11s everywhere when you do that, then I would say it's working. You can also rough-test a wideband: remove the sensor, in open air it should read lean, spray a rag with brake cleaner and cover it and it should go rich. I don't know if the MMCD narrowband output is valid when the ecu is ignoring the narrowband signal. I mean, I don't know if it is the raw signal or the ecu's interpretation of the signal. I don't run narrowbands at all so my logs aren't too helpful with this. You could look at other peoples logs and see how the numbers correlate. A serious exhaust leak could mess with the readings.

[DrGonzo]

The wideband is brand new and this is the only time it has ever been used so it better be good...LOL

I don't want to run it pig rich as I can get knock running it to rich and I don't want to screw up the rings from running to rich.

I trust my WB more that my stock O2's So I think I am just going to tune by it. I need to log a few more runs to get a better idea of when the car is entering into open/closed loop. That way I can better determine when the fuel maps take over. I know a lot of the knock is coming from the solid mounts. Looks like the most knock I got was 7 counts which should still be in the safe zone as the ECU will pull time to compensate.

I want to get more results and crunch the data so that I can compare them and see if the 7 counts of knock are consistent enough to richen up the RPM band or not. I'm still going to replace the front O2 and probably the knock sensor as they are due. Once I check the plugs, replace the throttle body and double check things like timing and pressure test I'll do a few more logging sessions and see what I come up with.