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RCB RCB is offline
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Default 03-24-2016, 06:55 AM

Quote:
Originally Posted by DV135i
Something they check for when you get your car smogged.
Here in MA our cars would not be able to get an inspection sticker unless the rear O2 sensor monitor cleared (readiness test). If the RMV scan can tell that the DME has been tampered with the car is then flagged and can only be reinspected at a RMV inspection station. So it becomes a major issue if any of this isn't below the surface.
I would want to know without a doubt that coding out the rear O2 sensors would fly under the radar before I install *** and did this.


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(#27)
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Default 06-19-2016, 08:25 PM

DID WHAT DMAC SAID, WORKED PERFECT, THANK YOU


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konvikt21 konvikt21 is offline
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Default 07-05-2016, 10:27 AM

whats the easiest way to find these values in the hex? Any way to search? IJE0S..


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Default 10-23-2017, 08:06 AM

Quote:
Originally Posted by Dmac @ BMS/DMD
Been running with my rear O2s unplugged from the DME for awhile now on 32psi.

What I did:
Remove pins 19 and 20 on the small black subconnector
Code out 2C9E and 2C9F in the flash
I had previously did this procedure but I've since reconnected the rear o2 sensors and I'm not sure if I connected the pins right. Does this look correct?


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Default 12-30-2017, 05:00 PM

Quote:
Originally Posted by Dmac @ BMS/DMD
Been running with my rear O2s unplugged from the DME for awhile now on 32psi.

What I did:
Remove pins 19 and 20 on the small black subconnector
Code out 2C9E and 2C9F in the flash

These codes weren't available in the public XDFs so I had to add their definitions in myself. Let me know if you have any questions.
Is it necessary to remove the pins from the sub connector or can I just leave the sensors themselves unplugged?


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Default 01-03-2018, 03:14 PM

Bump for answer on if DMAC's solution will allow '02 readiness'.

also bump for answer on if you can just leave it this way full-time, and trims and bank-to-bank variance will not be negatively affected.


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Default 01-04-2018, 11:13 AM

Quote:
Originally Posted by LessIsMore
also bump for answer on if you can just leave it this way full-time, and trims and bank-to-bank variance will not be negatively affected.
+1

I've been running with them unplugged for about a week now and logs look clean


2008 e61 535xit: VTT GCs, Fuel-it PI, fuelab FPR w/ return line, stage 2 lpfp, fuelab "700" inline pump, RB external PCV, VRSF 7.5" race FMIC, Inlets, outlet, AR ***, 3" chargepiping, 3" exhaust, JB4, BMS PI controller
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Default 01-05-2018, 09:37 AM

Definitely interested in knowing if o2 readiness can be achieved after disabling the o2's.


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Puganator46 Puganator46 is offline
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Default 06-12-2018, 12:31 PM

Is it possible to do the flashing through the mhd BEF?



08 335xi-Jb4 with MHD backend flash. DOC precision 6266 single turbo. BMS charge pipe with Tial BOV. On3 performance 7" intercooler. Stage 3 fuel-it lpfp. New index 12 injectors. New OEM hpfp.NGK 97506 2-step colder plugs, RB external pvc system with duel occ.
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Default 06-12-2018, 04:28 PM

Quote:
Originally Posted by Puganator46
Is it possible to do the flashing through the mhd BEF?
Are you trying to disable O2 via flash through MHD?


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Puganator46 Puganator46 is offline
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Default 06-13-2018, 05:18 AM

Yes!!! Lol also some other engine codes. I'm not concerned about the o2 readiness either. I don't see where mhd is an open flash program. I have access to ncsexpert, bmw coding tool, winKP, ista, etc and have done coding just need to know how to access the engine codes. Thank for the reply!!!!!!!



08 335xi-Jb4 with MHD backend flash. DOC precision 6266 single turbo. BMS charge pipe with Tial BOV. On3 performance 7" intercooler. Stage 3 fuel-it lpfp. New index 12 injectors. New OEM hpfp.NGK 97506 2-step colder plugs, RB external pvc system with duel occ.
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Puganator46 Puganator46 is offline
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Default 06-18-2018, 09:03 AM

Quote:
Originally Posted by Payam @ BMS
Are you trying to disable O2 via flash through MHD?
<Bump>



08 335xi-Jb4 with MHD backend flash. DOC precision 6266 single turbo. BMS charge pipe with Tial BOV. On3 performance 7" intercooler. Stage 3 fuel-it lpfp. New index 12 injectors. New OEM hpfp.NGK 97506 2-step colder plugs, RB external pvc system with duel occ.
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Default 06-22-2018, 03:20 AM

Quote:
Originally Posted by Puganator46
Yes!!! Lol also some other engine codes. I'm not concerned about the o2 readiness either. I don't see where mhd is an open flash program. I have access to ncsexpert, bmw coding tool, winKP, ista, etc and have done coding just need to know how to access the engine codes. Thank for the reply!!!!!!!
Use tunerpro


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(#39)
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Puganator46 Puganator46 is offline
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Default 06-23-2018, 01:41 PM

Quote:
Originally Posted by Haynpunch
Use tunerpro
I've only done a little research on the tuner pro, is this going to take place of the mhd? Or can I just make the changes I want while my car has the mhd BEF on it



08 335xi-Jb4 with MHD backend flash. DOC precision 6266 single turbo. BMS charge pipe with Tial BOV. On3 performance 7" intercooler. Stage 3 fuel-it lpfp. New index 12 injectors. New OEM hpfp.NGK 97506 2-step colder plugs, RB external pvc system with duel occ.
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langsbr langsbr is offline
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Default 06-23-2018, 05:44 PM

This thread spans a few years worth of work. I know the XDF now has the ability to toggle codes - but what of pins 19 and 20 in the DME?

I've read where it's been stated that the secondary O2s are needed to keep fuel trims correct, but Dmac said he removed them and all was good. Is that still the case, or has more been learned regarding DME behavior?
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Puganator46 Puganator46 is offline
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Default 06-23-2018, 06:52 PM

Quote:
Originally Posted by langsbr
This thread spans a few years worth of work. I know the XDF now has the ability to toggle codes - but what of pins 19 and 20 in the DME?

I've read where it's been stated that the secondary O2s are needed to keep fuel trims correct, but Dmac said he removed them and all was good. Is that still the case, or has more been learned regarding DME behavior?
Yes this has definitely been an on going topic lol, from the research I've found the rear o2 are only for c_a_t performance. So without c_a_t_s the rear sensors can cause the fronts to get out of calabration but besides that it's just an annoying CEL and from my experience a occasional rough idle until I clear the catalytic converter check/trimming codes.



08 335xi-Jb4 with MHD backend flash. DOC precision 6266 single turbo. BMS charge pipe with Tial BOV. On3 performance 7" intercooler. Stage 3 fuel-it lpfp. New index 12 injectors. New OEM hpfp.NGK 97506 2-step colder plugs, RB external pvc system with duel occ.
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335iE91 335iE91 is offline
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Default 06-24-2018, 09:54 AM

I’ve also been told that the rear sensors are used to calibrate the fronts. Seemed strange you can run the same ots maps with or without c@t$. Then again, if you’re Not running the rear sensors, how would the front sensors be calibrated? And are the rear sensors also still enabled in the single turbo ots maps?


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Puganator46 Puganator46 is offline
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Default 06-26-2018, 07:28 AM

Quote:
Originally Posted by 335iE91
Iíve also been told that the rear sensors are used to calibrate the fronts. Seemed strange you can run the same ots maps with or without c@t$. Then again, if youíre Not running the rear sensors, how would the front sensors be calibrated? And are the rear sensors also still enabled in the single turbo ots maps?
I would think the sensors calibrate on there own and basically the car makes adjustments between the two readings I presume that without c_a_t_s the fluctuations can get them out of calabration. You can run the maps with or without c_a_t_s because the rear sensors only pertain to the *** performance which "shouldnt" affect the cars performance. And yes they are enabled in ST maps



08 335xi-Jb4 with MHD backend flash. DOC precision 6266 single turbo. BMS charge pipe with Tial BOV. On3 performance 7" intercooler. Stage 3 fuel-it lpfp. New index 12 injectors. New OEM hpfp.NGK 97506 2-step colder plugs, RB external pvc system with duel occ.
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Default 06-30-2018, 09:59 PM

Agreed. But then the rear sensors should be switched off with open *** (ots map or not) to prevent the front sensors getting out of calibration, right?


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Puganator46 Puganator46 is offline
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Default 07-03-2018, 11:43 AM

Ya that's what I was hoping for as well but the ST map doesn't seem to be that way. I'm just trying to figure out if I can use an open flash tuner to delete them without having to change from the mhd BEF that I've already paid for!!!



08 335xi-Jb4 with MHD backend flash. DOC precision 6266 single turbo. BMS charge pipe with Tial BOV. On3 performance 7" intercooler. Stage 3 fuel-it lpfp. New index 12 injectors. New OEM hpfp.NGK 97506 2-step colder plugs, RB external pvc system with duel occ.
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Default 07-03-2018, 12:05 PM

Seach on YouTube for: ‘Single turbo 335i vs. emissions testing’


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Default 07-04-2018, 04:41 AM

For those of you who are not running rear o2 sensors:
Has anyone ever measured their afrís with an actual probe (on the dyno), and compared those numbers to a log of the same run? Twins or single


'08 e91 335i Auto
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Puganator46 Puganator46 is offline
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Default 07-05-2018, 05:32 AM

Quote:
Originally Posted by 335iE91
For those of you who are not running rear o2 sensors:
Has anyone ever measured their afrís with an actual probe (on the dyno), and compared those numbers to a log of the same run? Twins or single
I would think you could see this on logs



08 335xi-Jb4 with MHD backend flash. DOC precision 6266 single turbo. BMS charge pipe with Tial BOV. On3 performance 7" intercooler. Stage 3 fuel-it lpfp. New index 12 injectors. New OEM hpfp.NGK 97506 2-step colder plugs, RB external pvc system with duel occ.
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