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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 10-28-2013, 09:40 AM   #341
ATLZHP6M
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Still having issues with my voltage curves so please ignore any other values other than what is posted as a known working curve.

Furthermore, for those of you with MS45, I found this PDF online that has some good information on Post Cat O2 sensor operation:

During the evaluation period, the signal of the
post cat. sensor must remain within a relatively
constant voltage range (700 - 800 mV)
. The
post cat. O2 voltage remains high with a very
slight fluctuation. This indicates a further lack of
oxygen when compared to the pre cat. sensor.
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Old 10-28-2013, 10:58 AM   #342
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Originally Posted by ATLZHP6M View Post
Still having issues with my voltage curves so please ignore any other values other than what is posted as a known working curve.

Furthermore, for those of you with MS45, I found this PDF online that has some good information on Post Cat O2 sensor operation:

During the evaluation period, the signal of the
post cat. sensor must remain within a relatively
constant voltage range (700 - 800 mV)
. The
post cat. O2 voltage remains high with a very
slight fluctuation. This indicates a further lack of
oxygen when compared to the pre cat. sensor.
but you still haven't found a known working curve for MS45 or do you think it may be isolated to just your setup? I have an MS45 and gen3 headers that I was going to install after my next inspection just to buy myself 2 years in case I had problems with the LC-1 setup.

what are the symptoms of your "issues"? are you triggering CEL? O2 missing readiness?
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Old 10-28-2013, 05:31 PM   #343
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About 200 miles after the clear and it looks like everything's ok...


What diag prog is this?
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Old 10-28-2013, 09:07 PM   #344
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Old 10-28-2013, 10:02 PM   #345
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The MS45 and MS43 systems should use the same voltage curve. It is just simulating the post-cat voltage of a good cat regardless of the operating system.
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Old 10-29-2013, 08:34 AM   #346
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The MS45 and MS43 systems should use the same voltage curve. It is just simulating the post-cat voltage of a good cat regardless of the operating system.
You are right.
For some reason, I was led to believe there could be a small variation on the voltages needed for MS45 sensors but they really don't change that much if at all.
My issues are not necessarily related to the voltage curve I'm using but more to either my pre-cat sensors going bad or the LC1 needing calibration again.
I'll keep you guys posted once I have time to address the above,

Will.
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Old 10-29-2013, 08:38 AM   #347
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but you still haven't found a known working curve for MS45 or do you think it may be isolated to just your setup? I have an MS45 and gen3 headers that I was going to install after my next inspection just to buy myself 2 years in case I had problems with the LC-1 setup.

what are the symptoms of your "issues"? are you triggering CEL? O2 missing readiness?
Triggering cel with codes that either indicate I'm running too lean and sometimes codes that indicate I'm running too rich. I think the cel was initially triggered because the LC1 needs to be calibrated every so often. However, in INPA I'm seeing my pre-cat sensors voltages being too high. so we'll have to wait and see.
Previously I ran without cats with LC1 for several months without any issues.
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Old 10-29-2013, 11:40 AM   #348
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Has anybody experience a p1093/p1092 after running the LC-1 for some time?

and I cleared the codes after the installation and they never came back

Ive had a few instances where the DME would store a Pending Cat deficiency code for bank 2 but then that would clear on its own
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Old 01-08-2014, 01:02 PM   #349
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BUMP:

does the 3 month calibration require me to take to sensor out the pipe (free air)?

EDIT:NVM
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Old 01-08-2014, 02:11 PM   #350
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That is correct.
I just did mine.

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Old 01-12-2014, 09:35 PM   #351
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Hey guys, I haven't checked the tread in a while. What is the issue that people are having with the MS45 DME? I know the voltage curve works for MS43.
I have found a different curve that also seems to mellow out the long term fuel mixtures too. These are .700V up to 19:1 and .050V from 20:1 on out. Make sure you have that 1/3 second delay setup in the other menu.
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Old 01-13-2014, 09:21 PM   #352
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Thank you!
I'll try that new curve next. I have new pre cat sensors on order as I'm pretty sure my old ones are not functioning like they used to. My LC-1 worked flawlessly for months and of course when i needed the most my car decided to throw a CEL for a rich condition on both banks. I haven't been able to pass emissions yet.
Hopefully after I replace my pre cat sensors OBD monitors will complete and allow me to pass emissions.

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Old 01-19-2014, 08:03 PM   #353
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Finally passed emissions.
My pre-cat o2 sensors were the culprit. I guess it was time to change them after 130k miles of service.
After I swapped them, my monitors completed rather quickly and the car passed the test.

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Old 05-14-2014, 09:00 PM   #354
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Nice work! I'm still glad I don't have to futz with any of this though....

How come you don't have to futz? You're in dfw; I would think that's major futzing.
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Old 05-14-2014, 09:10 PM   #355
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Okay, so I'm a wimp and don't want o do this and mess something up... Is there anyone in the NH area (willing to travel a bit) who has done this with SUCCESS, and would be willing to give me a hand with it?

I'll be picking up an 04 M3 in a week or two and it has headers and occasionally throws an efficiency code (high flow cats). NH state inspection requires all monitors to be "Ready".
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Old 05-14-2014, 10:17 PM   #356
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Okay, so I'm a wimp and don't want o do this and mess something up... Is there anyone in the NH area (willing to travel a bit) who has done this with SUCCESS, and would be willing to give me a hand with it?

I'll be picking up an 04 M3 in a week or two and it has headers and occasionally throws an efficiency code (high flow cats). NH state inspection requires all monitors to be "Ready".
Don't be a wimp, it's not that hard. You don't have to go crazy with the heater circuit resistors. I have used 50ohm 10watt ceramic resistors on M3's with success and there not bigger then a chapstick.
The new LC-2 works really well and doesn't seem to need a recalibrate as often. The wiring isn't that hard and it's only your post-cat O2's, if you screw it up then just unplug them and drive. You only need your pre-cat O2's for closed loop mixture control. The most I have learned about cars came from working on my own cars, modifying them, screwing it up and learning what I did wrong.
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Old 07-05-2014, 10:28 AM   #357
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Don't be a wimp, it's not that hard. You don't have to go crazy with the heater circuit resistors. I have used 50ohm 10watt ceramic resistors on M3's with success and there not bigger then a chapstick.
The new LC-2 works really well and doesn't seem to need a recalibrate as often. The wiring isn't that hard and it's only your post-cat O2's, if you screw it up then just unplug them and drive. You only need your pre-cat O2's for closed loop mixture control. The most I have learned about cars came from working on my own cars, modifying them, screwing it up and learning what I did wrong.

Bumping this awesome thread. I have BB headers installed and Eurocharged software...but keep throwing a P0041 code...bank 1 sensor 2 and bank 2 sensor 2 swapped. I have swapped the sensors up top and also verified below that they were in the correct bank, and still get the code...so know I also can't pass the readiness check to get an inspection sticker. Im pretty sure the Eurocharged software turned off the post cat sensors so Im not sure why they're still being read as mixed up. My question is if I install the Lc2 do I need to have them turn my post cat sensors back on for this to work? Has anyone had experience with the LC-2 controller? I saw the diagram many pages back about the setup and wiring...but can anyone post updated pics or schematics with how this should be set up...Thanks
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Old 07-05-2014, 07:19 PM   #358
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Bumping this awesome thread. I have BB headers installed and Eurocharged software...but keep throwing a P0041 code...bank 1 sensor 2 and bank 2 sensor 2 swapped. I have swapped the sensors up top and also verified below that they were in the correct bank, and still get the code...so know I also can't pass the readiness check to get an inspection sticker. Im pretty sure the Eurocharged software turned off the post cat sensors so Im not sure why they're still being read as mixed up. My question is if I install the Lc2 do I need to have them turn my post cat sensors back on for this to work? Has anyone had experience with the LC-2 controller? I saw the diagram many pages back about the setup and wiring...but can anyone post updated pics or schematics with how this should be set up...Thanks
I have BB headers as well, no euro tune and I get the standard cat efficiency codes plus the P0041 sensor swap code. I suspect its because all 4 cat readings are so similar because there's no cats that it gets confused easily with these tiny variations from pre to post.

That in mind, if you go with the wideband solution and go back to the non-euro tune, that SHOULD be all you need. So whether you need the euro tune or not, the wideband fix should cover you. My gut says you would need the non-euro tune to let the ecu report on the post cat, but the fact that you get the P0041 error while on euro tune puzzles me.

Please post back whatever you end up doing.

Last edited by jamex; 07-05-2014 at 07:22 PM.
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Old 07-06-2014, 02:30 PM   #359
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I have BB headers as well, no euro tune and I get the standard cat efficiency codes plus the P0041 sensor swap code. I suspect its because all 4 cat readings are so similar because there's no cats that it gets confused easily with these tiny variations from pre to post.

That in mind, if you go with the wideband solution and go back to the non-euro tune, that SHOULD be all you need. So whether you need the euro tune or not, the wideband fix should cover you. My gut says you would need the non-euro tune to let the ecu report on the post cat, but the fact that you get the P0041 error while on euro tune puzzles me.

Please post back whatever you end up doing.
Yes. I am very puzzled myself. Will talk to my Tuner on Monday and see what he has to say about all of this...
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Old 07-15-2014, 09:11 PM   #360
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When people use the existing post cat sensors as the heaters instead of using the resistors, are ya'll just taping into the signal (black wire), and the ground (grey wire) of the wires after the OEM connections? Just wanting to clarify this. Would it be better to do this method or will the sensors eventually fail and need replacing, where the resistors should not fail? Thanks for all the help. I will be using the LC2 since it is the updated module.
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