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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N51 Secondary Air Pump Delete?



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      04-12-2018, 01:24 PM   #1
atmosphericM
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N51 Secondary Air Pump Delete?

Just did a quick search and I was surprised to not find anything. Granted, most of us are N52 which does not have the pump.

Has anyone seen this done? To you guys who know a lot about coding these cars and the ECU, would 'coding' be able to get rid of the inevitable CEL resulting from the pump being gone, or is that something that would have to be included as an option with a 'tune'? I am guessing it's the latter, unfortunately. When I deleted this ish off an older car of mine, I simply used resistors on the pump's harness to fool the car; however it appears that our ECU might actually look at the O2 sensors while 'testing' the pump to make sure air is indeed being injected. If the latter is necessary, any info on this from AA or BPC? Finally, does anyone know of a block-off plate offered? Think this one might work? https://www.ecstuning.com/b-genuine-...e/11121438086/ I'm not sure how similar the N51 opening is compared to the older motors.

Info on how SAP's generally work for those interested: http://www.pierburg-service.de/ximag...106_en_web.pdf

I'm looking into this because I enjoy messing with things, would like a cleaner engine bay, and losing the weight can't hurt. The endless pursuit of an N52... lol

TIA!
-aM
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      04-12-2018, 02:26 PM   #2
hassmaschine
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you can't "code" the DME.

I think you could probably flash it with a 328i based tune, which doesn't have the SAP. Not sure what other emissions monitors it would be missing.
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      04-12-2018, 05:29 PM   #3
atmosphericM
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Thanks for the reply. I'm trying to dissect it..

So one can 'code' our other computer modules because they are designed to work that way (so that different cars with different options can have the same module and software, while having different options set). That said, 'coding' is really just modifying a file with different parameters and then 'flashing' that file to the module, correct? I am guessing that the DME(ECU)'s software doesn't need to have 'options' built into it because every N52 328i in North America is the same, so they all have the EXACT same file flashed? And therefore BMW didn't set it up to easily change things within that software file as they did with the other modules? Makes sense. So that would mean the only option available is to have essentially a software/computer engineer tear into the code of the DME's software and change parameters the hard way, as they do with 'tunes' from BPC/AA? But are you saying that, while BPC can modify some parameters to make the car perform better, they are unable to change parameters involving the SAP, etc?

As far as flashing it with another 328i based tune (N52/N53), I don't see how. Wouldn't the tune need to be designed for the N51 and thus it would be looking for the SAP? Or are you saying flash it with a modified file from a tuner such as BPC/AA? I am under the impression that I can't flash my DME with the 330i file, for example, because the N51 motor is too different (apparently a different head, etc.)
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      04-12-2018, 05:52 PM   #4
hassmaschine
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No, coding is selecting an option that's already flashed inside the computer. You're not actually "flashing" the module - just telling the module to choose one value or another.

Technically, the DMEs are coded but that is locked after 10 hours, and is limited to a few things related to each chassis.

The N51 has it's own unique program but it's pretty much identical to the N52 (MSV80.1/MSV80). An "N52" file that you could flash doesn't exist, but it wouldn't be that hard to make one. Anyway, you'd only really need to make the changes related to SAP, not the whole calibration.
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