|
|
|
09-18-2018, 07:21 PM | #23 | |
Enlisted Member
39
Rep 44
Posts |
Quote:
In my case, I do not believe that this is 100% tune related yet. If I do manage to resolve it, I will report back with my findings. |
|
Appreciate
1
atmosphericM517.50 |
09-18-2018, 08:53 PM | #24 |
Captain
641
Rep 695
Posts |
To clarify my earlier post that was quoted, my idle issue started the day I had headers installed, not the day I installed the tune. I thought the tune would fix it, but it didn’t make any difference with the idle. I replaced MAF, MAP, eccentric shaft sensor, coils, and the rear O2 sensors, cleaned and swapped VANOS solenoids, nothing worked. Unplugging an O2 sensor (front or rear) fixes it, as does resetting adaptations, so I know it’s sensor related.
I would expect that an N51 car with just a tune or MILVs + tune would not have idle issues since mine seem to be related to the headers. Last edited by rowsdower; 09-19-2018 at 06:29 AM.. |
Appreciate
2
atmosphericM517.50 MattF40738.50 |
09-18-2018, 08:55 PM | #25 | |
Captain
641
Rep 695
Posts |
Quote:
|
|
Appreciate
3
|
09-19-2018, 09:55 AM | #26 | |
Basic Bimmer
518
Rep 935
Posts
Drives: E92 328i 6MT ///M
Join Date: Sep 2017
Location: B'ham
|
Quote:
Question: I see that you removed your SAI (SAP?) system. That's super awesome to hear. That is exactly what I also wanted to do when getting the tune, but I've yet to reach out to BPC about the details. 1) What did you use to block off the port on the engine? I think I've found a few blocking plates on the web but wasn't 100% sure if they would work or not... and 2) Was BPC able to "code/tune out" the CEL that would normally result from the SAI system not being in place? Thanks in advance!
__________________
Black Sapphire 328i ///M Sport Coupé Save the Manuals! |
|
Appreciate
0
|
09-19-2018, 09:59 AM | #27 |
Basic Bimmer
518
Rep 935
Posts
Drives: E92 328i 6MT ///M
Join Date: Sep 2017
Location: B'ham
|
Hmm, sad to hear that most if not all are having issues with headers on an N51. I'd really like that additional 15 whp from headers on top of the MILVS. But perhaps just deleting the secondaries and keeping the OE headers might be the way to go. =/
That's interesting about unplugging the rear O2 sensors... IIRC they're only there to check that the cats are working properly. If one is running catless headers, I would assume that the appropriate tune would essentially negate those sensors' function. Then again, I'm no tuner and I have no idea exactly what the sensors or tune really do in entirety. hassmaschine is a genius when it comes to how these DME's work so I'm gonna try to bring him in here for a little insight. Maybe we can get Bob@BPC or Phil@BPC to chime in, too...
__________________
Black Sapphire 328i ///M Sport Coupé Save the Manuals! Last edited by atmosphericM; 09-19-2018 at 10:08 AM.. |
Appreciate
0
|
09-19-2018, 12:56 PM | #28 | |
Banned
2465
Rep 9,004
Posts |
Quote:
|
|
Appreciate
0
|
09-19-2018, 07:32 PM | #29 | |
Captain
641
Rep 695
Posts |
Quote:
Getting BPC’s attention on the forum is hard since Phil and Bob have @ in their names so you can’t tag them. Maybe PM them or like Taskmaster said, call them. |
|
Appreciate
1
cerealwars78.00 |
09-20-2018, 08:18 AM | #30 |
Lieutenant
465
Rep 489
Posts
Drives: E39 M5/ E30 325is
Join Date: Nov 2017
Location: Raleigh, NC
|
I would reach out to Bob directly on this one. He would be of more help than me sadly. He can be reached at webmaster@bimmerperformancecenter.com
|
Appreciate
1
atmosphericM517.50 |
09-22-2018, 09:13 AM | #31 |
Captain
641
Rep 695
Posts |
Here's the other thread where someone mentioned the bouncing idle and removing the postcat O2 sensors as a solution. This guy has an AA tune though, not BPC, further reinforcing my belief that the idle issue is due to headers and not the tune. However it would be excellent if BPC had a tune that would fix the idle. Let us know what you find out from Bob@BPC.
https://www.1addicts.com/forums/show....php?t=1194190 |
Appreciate
1
atmosphericM517.50 |
09-23-2018, 02:34 PM | #32 |
Enlisted Member
39
Rep 44
Posts |
atmosphericM
The N52 comes with a block off plate in place of the Secondary Air Pump (SAP or if you like Stupid A** Part). Here is the complete list of parts I used: 11127521169 – Studs – 2 11727511542 – Block-off plate – 1 11727506214 – Gasket – 1 07119905949 – Locking Nuts – 2 There is one electrical connection that will need to be removed and zip tied off in a good spot, and from my research: Fuse for SAP is F89 (I have not disconnected, but do have notes it is connected to SAP Relay K6304 which is controlled by DME Control Unit A6000). Since I chose to handle it myself, I am not 100% sure. I did talk to a member of BPC staff about this before my header install. In our conversation, I believe it was mentioned this is not something the tune would resolve and would need to be coded out. Reach out to them and see, but I would wager they can sort you out on this. |
Appreciate
1
atmosphericM517.50 |
09-28-2018, 11:25 AM | #33 | |
Basic Bimmer
518
Rep 935
Posts
Drives: E92 328i 6MT ///M
Join Date: Sep 2017
Location: B'ham
|
Quote:
Regarding the electronics, do you have a CEL that resulted from deleting the SAP? I don't want any CEL's which is why I wonder about tuning/coding out. On an older car I wired in a resistor at the connection, but I'd like something cleaner for the bimmer. I'll reach out to BPC for more info on the header surge as well as the SAP coding, but in full disclosure it might be a while before I do so because I don't plan on tackling these mods for another 6 months or so do to CPO warranty.
__________________
Black Sapphire 328i ///M Sport Coupé Save the Manuals! |
|
Appreciate
0
|
09-28-2018, 12:16 PM | #34 |
Basic Bimmer
518
Rep 935
Posts
Drives: E92 328i 6MT ///M
Join Date: Sep 2017
Location: B'ham
|
Just did a little research and wanted to chime in a bit with what I found / thought. Looks like a CEL will definitely happen (eventually) after removing the SAP/SAI. I'm seeing P1415/2D06 as the code, but I'm not 100% sure on that.
After thinking, I remember reading that the BMW actually looks at the O2 sensors to determine SAP performance, so installing a resistor on the SAP's plug wouldn't help with CEL's at all. I read of one guy using an O2 'simulator' to simulate what the O2 sensors should send to the DME for the first 30 seconds after starting (when the SAP would be running).. but that's not really the way I'd like to go, either. Further, it looks as if many different potential problems with the engine can all result in the same fault code that the SAP failure (or removal) would throw, so perhaps simply removing that fault code from the DME tables (if that's even a thing) would not be a wise solution. I'm starting to think that the only way to really do this well is to somehow change the tables in the DME's software to reflect N52 values.. but it's starting to get way over my head since I know so little about how the computer monitors and evaluates the SAI system's performance. Hmm.. I wonder if this is an area of the DME software that could simply be removed, resulting in an N51/N52 DME software hybrid of sorts. .. just trying to understand all that I can before reaching out to the pros.
__________________
Black Sapphire 328i ///M Sport Coupé Save the Manuals! Last edited by atmosphericM; 09-28-2018 at 12:22 PM.. |
Appreciate
0
|
09-28-2018, 03:03 PM | #35 | |
Captain
641
Rep 695
Posts |
Quote:
|
|
Appreciate
0
|
09-28-2018, 03:22 PM | #36 |
Basic Bimmer
518
Rep 935
Posts
Drives: E92 328i 6MT ///M
Join Date: Sep 2017
Location: B'ham
|
^ Honestly I am not sure, but from what I've read on the interwebs, a different head is the cause for the slightly lower compression ratio, and supposedly the pistons are the same. Considering the SAP port being found on both heads though, I am starting to wonder, myself.
Some people also say that the N51's secondary cats are a higher cell count, thus being cleaner but also more restrictive - however I've never been able to find definitive info there, either. Of course other small changes exist, as well, such as slightly different radiator, the SAP/SAI system, variable length intake manifold, etc.
__________________
Black Sapphire 328i ///M Sport Coupé Save the Manuals! |
Appreciate
0
|
09-28-2018, 03:35 PM | #37 |
Basic Bimmer
518
Rep 935
Posts
Drives: E92 328i 6MT ///M
Join Date: Sep 2017
Location: B'ham
|
A quick trip to RealOEM.com gave me this, but I'm not sure what it's worth. Cyl. heads could be differently part numbered due to something as simple as whether or not that SAP block off plate is provided, I suppose. Perhaps N51 and N52 have different heads as well as pistons. At lest that's what the P/N's say...
11127591619 - N51 Cyl. Head 11257560131 - N51 Piston 11127591617 - N52 Cyl. Head 11257558528 - N52 Piston
__________________
Black Sapphire 328i ///M Sport Coupé Save the Manuals! Last edited by atmosphericM; 09-28-2018 at 03:41 PM.. |
Appreciate
0
|
09-29-2018, 06:32 AM | #39 | |
Captain
641
Rep 695
Posts |
Quote:
Curious - do you have an N51 or an N52? |
|
Appreciate
1
cerealwars78.00 |
09-29-2018, 10:00 AM | #40 | |
Banned
2465
Rep 9,004
Posts |
Quote:
|
|
Appreciate
0
|
09-29-2018, 11:26 AM | #41 |
Captain
641
Rep 695
Posts |
|
Appreciate
0
|
09-30-2018, 02:54 AM | #42 |
Banned
2465
Rep 9,004
Posts |
|
Appreciate
0
|
09-30-2018, 11:05 AM | #43 | |
Bowties r cool ▶:◀
1409
Rep 796
Posts
Drives: 09' 128i MT e88, 24'G05 X5 50e
Join Date: Apr 2014
Location: Chicago
|
I have had 2 N51 128's both have the idle issue, older coils amplify the issue but never removed it. in Dec 2012 BMW had a service bulletin SIB 12-09-12 for DME update to fix/minimize it. This started for N55 DCT and expanded to N51 in spring 13'. In Spring 14' new bulletin and DME update
Quote:
|
|
Appreciate
1
cerealwars78.00 |
Post Reply |
Bookmarks |
|
|