MHD - No Exhaust Burble?

squeedle

Lurker
May 29, 2017
19
4
0
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?
 

Clean WHP

Corporal
Apr 24, 2017
173
136
0
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
 

doublespaces

Administrator
Oct 18, 2016
9,135
4,171
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AZ
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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
 
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squeedle

Lurker
May 29, 2017
19
4
0
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?
 

1and1

Specialist
Dec 28, 2016
60
34
0
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.
 

[email protected]

Lieutenant
Nov 14, 2016
655
261
0
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?
 
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doublespaces

Administrator
Oct 18, 2016
9,135
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AZ
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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.
 
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[email protected]

Lieutenant
Nov 14, 2016
655
261
0
North Wilkesboro
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.
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
 

Bmac

Specialist
Nov 8, 2016
78
34
0
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.
 

08_335i

Sergeant
Nov 3, 2016
372
217
0
28
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.
 

squeedle

Lurker
May 29, 2017
19
4
0
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.
 
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Duplicities

Lurker
Jun 1, 2017
24
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0
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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.
 

BMWE92_Harry

Specialist
Apr 28, 2017
62
15
0
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.