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MHD - No Exhaust Burble?

Discussion in 'N54' started by squeedle, Aug 15, 2017.

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  1. squeedle

    squeedle Lurker

    Messages:
    19
    Location:
    SF Bay Area
    Ride:
    2009 135i AT MSport Coupe
    Just flashed my N54 AT 135i with MHD for the first time. I used the Stage1 91oct map. In the options, I selected catted downpipes (which I have) and exhaust burble to 1sec/1sec and "soft". Didn't hear any burble. Upped it to 1sec/1sec "hard", still nothing.

    Is this a feature that only works with catless downpipes or something?
     
  2. Clean WHP

    Clean WHP Corporal

    Messages:
    145
    Ride:
    2010 135i Msport 6MT
    not sure, but I know an aftermarket / louder exhaust exaggerates the burbles. My car is on 1 sec soft with a BMR 3.5" full exhaust and VRSF catless downpipes so it definately is a loud exhaust, and the burbles are pretty loud even just on soft
     
  3. squeedle

    squeedle Lurker

    Messages:
    19
    Location:
    SF Bay Area
    Ride:
    2009 135i AT MSport Coupe
    Yeah I watched your vid. Sounded great. But no burbles here. :(
     
  4. doublespaces

    doublespaces Administrator

    Messages:
    5,937
    Location:
    AZ
    Ride:
    2009 E93 335i
    How high do you take the RPMs? Got a vid?
     
  5. squeedle

    squeedle Lurker

    Messages:
    19
    Location:
    SF Bay Area
    Ride:
    2009 135i AT MSport Coupe
    I tried everything from 2k to almost redline. No vid, sorry. Kinda baffled.
     
  6. doublespaces

    doublespaces Administrator

    Messages:
    5,937
    Location:
    AZ
    Ride:
    2009 E93 335i
    I've never played with those settings and I'm catless so I can't really help you out there, sorry. Your cats may just be doing a good job. I'd tell you to turn it up more if you can but I don't want to be the reason you blow your cats out, lol
     
  7. squeedle

    squeedle Lurker

    Messages:
    19
    Location:
    SF Bay Area
    Ride:
    2009 135i AT MSport Coupe
    I tried it at "soft" (2nd lowest setting) and "hard" (highest setting). So there's nowhere more to turn it up. :) I disabled it at the end because it was doing nothing and I'd rather not waste fuel or risk anything funky happening until I figure this out. Does MHD offer any support?
     
  8. doublespaces

    doublespaces Administrator

    Messages:
    5,937
    Location:
    AZ
    Ride:
    2009 E93 335i
  9. 1and1

    1and1 Private

    Messages:
    41
    Location:
    Tally, FL
    The sound is barely audible with the stock exhaust. I ran a berk street axleback on my '09 135 with an AT and the burble was very noticeable. When I switched back to the stock muffler the sound was so hidden I finally just switched off the burble option.
     
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  10. Derek@MoorePerformance

    [email protected] Lieutenant Vendor

    Messages:
    653
    Location:
    North Wilkesboro
    Often for the first couple drive cycles after flashing a new map, it will not do any burbles on mine as well. What I would do is re-flash the map, do a complete drive cycle and then see if you can get some burbles when letting the revs idle down from like 3500 - 4k.

    Also, whenever you do check for codes or anything like that is your Evap completing?
     
  11. squeedle

    squeedle Lurker

    Messages:
    19
    Location:
    SF Bay Area
    Ride:
    2009 135i AT MSport Coupe
    sorry what's "Evap completing"?
     
  12. Derek@MoorePerformance

    [email protected] Lieutenant Vendor

    Messages:
    653
    Location:
    North Wilkesboro
    It's a readiness check but, could possibly interfere with the burbles.
     
  13. doublespaces

    doublespaces Administrator

    Messages:
    5,937
    Location:
    AZ
    Ride:
    2009 E93 335i
    Evap, if I remember correctly, is a picky one. You have to drive a wide variety of speeds and distance in order to get it to click over to ready.
     
  14. Derek@MoorePerformance

    [email protected] Lieutenant Vendor

    Messages:
    653
    Location:
    North Wilkesboro
    It is a touchy one but, I would highly suggest just driving like normal but, don't pass the 3k RPM mark for about 10-20miles. Find a nice long low-traffic road and play your favorite album :D
     
  15. Bmac

    Bmac Specialist

    Messages:
    71
    Location:
    Great White North
    I'm catless and no burble here as well. No matter what I tried it didn't sound any different than stock so I ended up just disabling it as well. When it was released there were 1 or 2 other people in the same boat. I don't think anyone ever understood why.
     
  16. 08_335i

    08_335i Sergeant

    Messages:
    371
    Ride:
    2008 ST 335i
    I've found on mine anything under the most aggressive and at least 2 seconds I don't get anything out of it.
     
  17. squeedle

    squeedle Lurker

    Messages:
    19
    Location:
    SF Bay Area
    Ride:
    2009 135i AT MSport Coupe
    Interesting, I'll probably just leave it off then. That's too bad, because I do love the sound, but I don't want to go catless or buy an exhaust which will do nothing except for possibly sound louder.
     
  18. Duplicities

    Duplicities Lurker

    Messages:
    24
    Ride:
    E90 335i FBO w/ Inlets (soon)
    Just go catless, you wont regret it. Although I truly only started hearing the burble after cutting out my mufflers and replacing them with a 2.5" pipe.
     
  19. squeedle

    squeedle Lurker

    Messages:
    19
    Location:
    SF Bay Area
    Ride:
    2009 135i AT MSport Coupe
    Nah, no catless for me. The car is wicked fast already, I'm happy. :)
     
  20. BMWE92_Harry

    BMWE92_Harry Specialist

    Messages:
    61
    Ride:
    N54 E92
    I flashed mine and took coupe drive cycle for it to become very noticeable. I have it set to the second to the highest setting, but i am going to tune it down a bit, it gets annoying on deceleration after awhile.
    -BMW performance exhaust, VRSF catless DP, MMP turbos.
     
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