Akrapovic silencer and tune

Discussion in 'GS Boxers' started by DDPRider, Jul 31, 2020.

  1. DDPRider

    DDPRider Adventurer

    Joined:
    Jun 9, 2020
    Oddometer:
    14
    Location:
    California
    I recently installed the Akrapovic slip-on silencer on my 2020 R1250 GSA .

    The bike is running lean. Are there tunes out there for this application?

    Thanks in advance
    #1
  2. Lead Wrist

    Lead Wrist Mehr Gelände Weniger Straße

    Joined:
    May 26, 2007
    Oddometer:
    7,102
    Location:
    Zer0-Zer0-Zer0-Zer0
    By changing the slip-on to Akrapovic from OE, you haven't changed how the bike runs. If it is lean now, it was lean before... :deal

    There are tunes (ECU flash-ones) but having them may void your warranty - should look into that a bit further (ie. Brentuning - spelling?)...

    There's also fuel enricher/controller of sorts called AF-X... something something which may help in your situation... Some say it does help so it actually may help you too...

    Many of us have changed the slip-on without changing anything in the fuel/map management of our bikes - ymmv... :deal
    #2
  3. ragtoplvr

    ragtoplvr Long timer

    Joined:
    Oct 18, 2007
    Oddometer:
    11,193
    Location:
    central USA
    The bike CAN NOT run lean or rich as long as the ecm and sensors are functioning. There is a mixture sensor on the exhaust pipe. It compensates.

    This is fake knowledge that has circulated for years because of deceleration backfire which can be reduced by overfueling. There is high vacuum and a very thin cylinder filling, not enough to combust. Making it richer gains you nothing real. You should have a deceration fuel cutoff as long as you return the grip to idle on decel and you will not have popping above about 2K RPM.


    Overfueling does reduce temps a little, Boxers do not have overheating problems. All it does is waste fuel and pollute the air.


    Stand by for all kinds of comments about how I am wrong.


    Rod
    #3
    lewisjr1, Dorian and m931a2 like this.
  4. Lead Wrist

    Lead Wrist Mehr Gelände Weniger Straße

    Joined:
    May 26, 2007
    Oddometer:
    7,102
    Location:
    Zer0-Zer0-Zer0-Zer0
    On a slip-on? Hmmm... My '16 didn't have that... :hmmmmm
    #4
  5. srv256ss

    srv256ss Been here awhile

    Joined:
    Mar 22, 2015
    Oddometer:
    134
    Location:
    ATL, GA
    The 1250 has 3 O2 sensors, one after the cat.
    #5
    SidewinderX likes this.
  6. Lead Wrist

    Lead Wrist Mehr Gelände Weniger Straße

    Joined:
    May 26, 2007
    Oddometer:
    7,102
    Location:
    Zer0-Zer0-Zer0-Zer0
    ^^ Yes it does but on the headers not on slip-on? The previous poster mentioned "exhaust pipe" as in slip-on pipe?? :dunno
    #6
  7. Matsgs

    Matsgs Adventurer

    Joined:
    Oct 2, 2019
    Oddometer:
    46
    Location:
    Germany
    folks the 1250 runs two wideband sensors and compensates automatically you can run without exhaust it does not matter and the third probe is not yet active this is intented for Euro5 to detect if someone has altered the target lambda values and throw an engine fault.
    #7
  8. third eye

    third eye back road loon Supporter

    Joined:
    Sep 2, 2010
    Oddometer:
    417
    Location:
    Concord, CA
    ^^^^ so the third probe is not activated for U.S market?
    #8
  9. Matsgs

    Matsgs Adventurer

    Joined:
    Oct 2, 2019
    Oddometer:
    46
    Location:
    Germany
    not yet ... Current software ignores the signal
    #9
  10. third eye

    third eye back road loon Supporter

    Joined:
    Sep 2, 2010
    Oddometer:
    417
    Location:
    Concord, CA
    I have changed exhausts and tuning on several other bikes that I have owned but my 1250 runs really well bone stock. I may keep it that way
    #10
    Bluetooth Tuner likes this.
  11. ragtoplvr

    ragtoplvr Long timer

    Joined:
    Oct 18, 2007
    Oddometer:
    11,193
    Location:
    central USA
    NO a slip on is a slip on, it attaches to the existing exhaust pipes. Makes more noise, maybe a slight change in power, can be + or -. Those existing exhaust pipes have one or more mixture sensors, there are several types. Unplugging them generates a ECU fault.
    Rod
    #11
  12. Lead Wrist

    Lead Wrist Mehr Gelände Weniger Straße

    Joined:
    May 26, 2007
    Oddometer:
    7,102
    Location:
    Zer0-Zer0-Zer0-Zer0
    Got it - by exhaust pipes you mean headers which do have 2+1 O2 sensors on R1250...
    #12
  13. m931a2

    m931a2 Been here awhile Supporter

    Joined:
    Oct 2, 2014
    Oddometer:
    412
    Location:
    Austin, Texas
    If you have a need to fix something look in to getting a AFXied for your bike. Make it richer and not pop as much.

    Chat here sales here and here
    #13
    Rockred likes this.
  14. DDPRider

    DDPRider Adventurer

    Joined:
    Jun 9, 2020
    Oddometer:
    14
    Location:
    California
    Thanks for all the comments. Interesting read.
    #14
  15. leafman60

    leafman60 Long timer

    Joined:
    Aug 14, 2005
    Oddometer:
    3,976
    2016 bikes were EURO 3 and not as strict about such items.

    Since then, we've had EURO 4 and now EURO 5. These standards have an application day for new models and usually a year's delay for existing models. If I recall correctly, EURO 5 was mandated at the beginning of 2020 for new models but delayed another year for existing models.

    .
    #15
  16. luca9277

    luca9277 Been here awhile

    Joined:
    Feb 25, 2012
    Oddometer:
    329
    Location:
    Singapore
    +1 for the AF-Xied. Best add-on my GS.
    I have de-cat headers, Akra slip-on and K&N filter
    It makes the bike run like a dream
    #16
    Rockred likes this.
  17. Matsgs

    Matsgs Adventurer

    Joined:
    Oct 2, 2019
    Oddometer:
    46
    Location:
    Germany
    All new 1250 build after August i believe will be Euro 5.
    #17
  18. Bluetooth Tuner

    Bluetooth Tuner Adventurer

    Joined:
    Sep 10, 2019
    Oddometer:
    63
    Location:
    London
    AF-xied is great for the 1200 wethead, not available yet for the 1250, but IMHO leave the 1250 alone it has a brain and after a few tanks of gas will adapt to the new pipe, and certainly do not believe that some imaginary tune from the UK or Australia that BMW cannot see will fix your bike, not naming names as to not pollute the thread.
    #18
    Rockred likes this.
  19. ragtoplvr

    ragtoplvr Long timer

    Joined:
    Oct 18, 2007
    Oddometer:
    11,193
    Location:
    central USA
    Dyno sheet for power increase or seat of the pants.
    #19
  20. side-burn

    side-burn Long timer

    Joined:
    Apr 28, 2019
    Oddometer:
    1,254
    Location:
    Colorado
    Odd. My Akra slip on was fine after riding about 60 minutes for the ECU to tweak the AFR.
    #20