MHD - No Exhaust Burble?

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

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  1. squeedle

    squeedle Lurker

    19
    SF Bay Area
    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 Private

    49
    2008 135i fully loaded
    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

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

    doublespaces Administrator

    AZ
    2009 E93 335i
    How high do you take the RPMs? Got a vid?
     
  5. squeedle

    squeedle Lurker

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

    doublespaces Administrator

    AZ
    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

    19
    SF Bay Area
    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

    AZ
    2009 E93 335i
  9. 1and1

    1and1 Private

    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. 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

    19
    SF Bay Area
    2009 135i AT MSport Coupe
    sorry what's "Evap completing"?
     
  12. It's a readiness check but, could possibly interfere with the burbles.
     
  13. doublespaces

    doublespaces Administrator

    AZ
    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. 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. 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

    305
    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

    19
    SF Bay Area
    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

    23
    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

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

    BMWE92_Harry Private

    42
    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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