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2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning Unusually loud backfires, pops, and gurgles

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      06-06-2018, 02:07 PM   #1
Rony316
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Unusually loud backfires, pops, and gurgles

Hello N55ers. Not a frequent occurrence but has occurred more than once for me to notice.

Been getting unusually loud crackles and burbles from my car. Currently running catless and JB4 (map 1).

My questions are:

Is anyone with same/similar mods experiencing this?
Does this have to do with JB4 perhaps giving wrong signals (too much fuel?)?

Any ideas or comments?
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      06-06-2018, 02:16 PM   #2
Dynamic_m235
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That’s the downpipe my friend, nothing unusual.. just beautiful burbles haha
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      06-06-2018, 02:19 PM   #3
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Quote:
Originally Posted by Dynamic_m235 View Post
That's the downpipe my friend, nothing unusual.. just beautiful burbles haha
Have had the downpipe for well over a year. But on a few occasions (like 3 separate times) I get these insane pops and burbles. I would say about double the volume. People on the sidewalk were frightened.

Sounds beastly. Almost wish it was always that loud, but I'm wondering if somehow the car is running too rich on those rare occasions.
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      06-06-2018, 03:11 PM   #4
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Quote:
Originally Posted by Rony316 View Post
Have had the downpipe for well over a year. But on a few occasions (like 3 separate times) I get these insane pops and burbles. I would say about double the volume. People on the sidewalk were frightened.

Sounds beastly. Almost wish it was always that loud, but I'm wondering if somehow the car is running too rich on those rare occasions.
I noticed that there was a sweet spot for this condition . Usually when the car is warning up.

If I manually downshift like 5-7 minutes after the car started I'd get a couple loud pops, but then it would be warmed up after that.
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      06-06-2018, 04:10 PM   #5
Questofthetune
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I downshift when I’m coming up to a light and keep the rpms above 5k until I get to 2nd and then I’ll let it drop below 5’amd around 4500 I’ll give a tiny blip and I’ll get gunshots. Best way to start the day.
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      06-22-2018, 07:53 AM   #6
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Quote:
Originally Posted by Rony316 View Post
Have had the downpipe for well over a year. But on a few occasions (like 3 separate times) I get these insane pops and burbles. I would say about double the volume. People on the sidewalk were frightened.

Sounds beastly. Almost wish it was always that loud, but I'm wondering if somehow the car is running too rich on those rare occasions.
Check valvetronic. Mine had this too and shaky idle, due to valvetronic sensor not working the car goes rich on idle but it wont pop until you drive it. Its hard to notice.

Do you have fuel smell on idle and when on light cruise?
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      06-23-2018, 01:46 AM   #7
f32alex
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This doesnt sound abnormal to me, I am full straight pipe and it has insane burbles always but every once in a while maybe once a month I will get a super loud one that sounds gun shot-ish
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      06-23-2018, 03:21 PM   #8
Dylan86
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If you blip the throttle while decelerating and burbling, you'll get the loud backfires..
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      06-26-2018, 08:20 AM   #9
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To chime in on the other comments, I've found that my car will make gunshot noises if I'm engine braking down a hill between 2.5/4k rpm and tap the throttle. Once or twice these pops have been so shockingly loud I could feel it in my chest.

I'm all stock except for a straight axle back post resonator.
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      06-26-2018, 10:17 AM   #10
x3user45
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If you drive in Sport Mode with the shifter to the left in manual mode, you will get a lot more burble and noise in general, mine with resonator delete and MPE can really produce some lovely sounds when driving in this mode.
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      06-26-2018, 03:12 PM   #11
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In sport mode, usually when warming up or on cold days, I would also get loud burbles and pops; but always at lower rpms, but also goes away after warmup.

I do have the MPE tho.
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