S63Tu Bank 1 and Bank 2 Boost

Six Pot · 03-30-2017, 12:53 PM

So I went a little mod crazy since I bought this car 3 weeks ago and should of did some more investigation. Now I am faced with a couple questions/concerns and hoping to find some answers.

As I continue to look at the logs I see that Bank 1 is producing 1-2 psi less on average compared to Bank 2. Is this something typical on this platform or is there something I should focus on?

Additionally, since I added the BCM and 2-step plugs I am now getting a error when the car first starts up and has a tad of rough idle. 118110 Mixture control 2, cross-bank: Fuel-air mixture too lean. Under operation I get no errors. Cleaned/swapped MAFs and still getting the same error, what should I try next? Coils?

Mods: JB4, BCM, BMS Intakes, CPs, NGK 2 step colder, RPI C*tL*ss D*wnpipes

ur20v · 03-31-2017, 01:56 AM

The variance / delta between banks is normal - they are seprate systems from intake through to turbos and then out the back.

ur20v · 03-31-2017, 01:57 AM

How long have you driven on the mods, car will take sometime/miles to adapt...

ur20v · 03-31-2017, 01:59 AM

Just spotted you are running DP's with out catalitic converters and doen't appear to have a flash tune to stop the monitoring... this will cause Cels.

Six Pot · 03-31-2017, 10:34 PM

The DP CELs are noticeable and can be cleared out via the JB4. I'm pretty sure there is something off one the passenger side bank, possibly a boost leak

DenverF10M5 · 03-31-2017, 10:56 PM

I never had identical boost on both banks. There was always a 1-2 psi difference.

momos750 · 04-01-2017, 12:43 AM

2 step colder plugs may cause some issues. Try stock to one step colder at most with your mods.

Six Pot · 04-01-2017, 02:59 PM

Quote:

Originally Posted by momos750

2 step colder plugs may cause some issues. Try stock to one step colder at most with your mods.

I went by the recommendations from Burger, 2-steps are fine but my stupidity is what caused it. The exchanger was not seated into the rear peg which pulled the lower boot off and ripped the fuel vent value pipe off the connecting lower tube. Moral of the story is take your time when doing the BCM install.

After fixing this its a monster again with no errors and hitting targets :-)

allmotor_2000 · 04-01-2017, 08:50 PM

Great you root caused it - sometimes those mixture issues are tough to debug

03-30-2017, 12:53 PM	#1
Six Pot Lieutenant 416 Rep 441 Posts Drives: 1M Join Date: Jun 2010 Location: Cincinnati iTrader: (3) Garage List 2008 135i [0.00] 2007 BMW M5 [0.00]	S63Tu Bank 1 and Bank 2 Boost So I went a little mod crazy since I bought this car 3 weeks ago and should of did some more investigation. Now I am faced with a couple questions/concerns and hoping to find some answers. As I continue to look at the logs I see that Bank 1 is producing 1-2 psi less on average compared to Bank 2. Is this something typical on this platform or is there something I should focus on? Additionally, since I added the BCM and 2-step plugs I am now getting a error when the car first starts up and has a tad of rough idle. 118110 Mixture control 2, cross-bank: Fuel-air mixture too lean. Under operation I get no errors. Cleaned/swapped MAFs and still getting the same error, what should I try next? Coils? Mods: JB4, BCM, BMS Intakes, CPs, NGK 2 step colder, RPI CtLss Dwnpipes __________________ 2011 BMW VO 1M (Currently in pieces for New Build!) ==OLD SETUP== ViE 3884 \| PR \| JB4 \| EOS Billet Fuel / Manifold \| Seibon Hood \| Spec Twin \| 900IC \| Slek Lip / Diffuser \| EC7 Wheels \| KW HAS \| Maddad + GTHaus \| P3 \| ViE Can Last edited by Six Pot; 03-30-2017 at 01:00 PM..*
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03-31-2017, 01:56 AM	#2
ur20v Captain 184 Rep 788 Posts Drives: F10 M5 Join Date: Apr 2016 Location: WA Australia iTrader: (0)	The variance / delta between banks is normal - they are seprate systems from intake through to turbos and then out the back.
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03-31-2017, 01:57 AM	#3
ur20v Captain 184 Rep 788 Posts Drives: F10 M5 Join Date: Apr 2016 Location: WA Australia iTrader: (0)	How long have you driven on the mods, car will take sometime/miles to adapt...
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03-31-2017, 01:59 AM	#4
ur20v Captain 184 Rep 788 Posts Drives: F10 M5 Join Date: Apr 2016 Location: WA Australia iTrader: (0)	Just spotted you are running DP's with out catalitic converters and doen't appear to have a flash tune to stop the monitoring... this will cause Cels.
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03-31-2017, 10:34 PM	#5
Six Pot Lieutenant 416 Rep 441 Posts Drives: 1M Join Date: Jun 2010 Location: Cincinnati iTrader: (3) Garage List 2008 135i [0.00] 2007 BMW M5 [0.00]	The DP CELs are noticeable and can be cleared out via the JB4. I'm pretty sure there is something off one the passenger side bank, possibly a boost leak __________________ 2011 BMW VO 1M (Currently in pieces for New Build!) ==OLD SETUP== ViE 3884 \| PR \| JB4 \| EOS Billet Fuel / Manifold \| Seibon Hood \| Spec Twin \| 900IC \| Slek Lip / Diffuser \| EC7 Wheels \| KW HAS \| Maddad + GTHaus \| P3 \| ViE Can
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03-31-2017, 10:56 PM	#6
DenverF10M5 Lieutenant 121 Rep 411 Posts Drives: 2014 F10 M5 CP Join Date: Sep 2016 Location: Denver iTrader: (0)	I never had identical boost on both banks. There was always a 1-2 psi difference.
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04-01-2017, 12:43 AM	#7
momos750 Captain 143 Rep 715 Posts Drives: 2015 M5, 2011 750Li Join Date: Jul 2015 Location: CA iTrader: (0)	2 step colder plugs may cause some issues. Try stock to one step colder at most with your mods. __________________ 2015 M5 - Singapore Grey Metallic - Silverstone Full Merino Interior - Executive Pack - Drivers Assist Pack -Comp Pack -
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04-01-2017, 08:50 PM	#9
allmotor_2000 F10 1/4 WR: 9.9s / 142.5mph 1/2 WR: 175.5mph 1087 Rep 1,968 Posts Drives: 2018 RS3, 991 Turbo Join Date: Jul 2014 Location: Westlake Village, CA iTrader: (0)	Great you root caused it - sometimes those mixture issues are tough to debug
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