08-03-2021, 11:30 AM | #1 |
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Exhaust pops and blurbs
Hi everyone,
Must say this is a great forum for finding out things about the car! Onto todays question.... Took delivery of my car (M235i) just over a month ago and as of yet I still haven't heard the exhaust pop and splutter on start up (Done the 1200 miles run in period too). Is there a preferred way to start the car so I hear it pop? Does it only do it when you rev over a certain amount? Although I'm now wondering if, because of EU regulations, that they have programed the ECU to stop doing this? Anyone any insight? |
08-03-2021, 02:22 PM | #3 |
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I take delivery of mine in 2 days... I see videos on YouTube etc where some are having a few burbles etc upon starting and some aren't. Same year of registration also...
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08-03-2021, 03:01 PM | #4 | |
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Im asking if BMW has changed the software so it doesn't pop and splutter, or if it does it in a certain start up sequence? Cheers |
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08-03-2021, 03:02 PM | #5 |
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Happy days for you coming up. Enjoy the car, 1200 miles in in mine and I'm still like a kid with a new toy
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08-03-2021, 03:15 PM | #6 |
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I think BMW online genius live chat are close to blocking me from asking for any updates. Only a couple of sleeps to go! Glad to see you're still enjoying yours!
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08-03-2021, 03:41 PM | #7 | |
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I came from an Audi S5 and was worried that it wouldn't be as fast (330bhp vs the 306 of the BMs) but I must say its actually quicker and it puts the power down in a way that blows the S5 out of the water. Turbo over supercharger any day of the week. Gear changes are fierce too. Do run the engine in though. My salesman tried to tell me it doesn't need it but I'm not gambling with a car that I plan to have for years to come. |
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08-03-2021, 03:48 PM | #8 | |
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08-03-2021, 03:59 PM | #9 | |
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I did stay below the 4000 rpm and no kickdown and didn't put the gearbox into sport mode either. Although I think one time the kickdown did catch me out. After about 800 miles I started to be a little heavier footed but certainly didn't plant the accelerator. Just slowly eased it up over the rpms. At 1000 miles I was driving it the way I wanted. Although still haven't used launch yet. For every person that says be gentle there is another that says don't be daft its run in at the factory. Which it is, but at the same time this is a mechanical engine. Everything needs eased in. Speakers, TVs, shoes! My advice. Yeah run it in, you'll fell better for it in the long run. Lets face it 1000 miles is easy. Took me less than a month. |
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08-03-2021, 04:05 PM | #10 | |
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08-03-2021, 09:04 PM | #11 | |
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08-03-2021, 09:09 PM | #12 |
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08-03-2021, 09:39 PM | #13 | |
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I'd say 90% of the time mine pops. |
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08-15-2021, 11:40 AM | #15 |
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https://www.youtube.com/watch?v=tT6hxP4CzEQ
Unplug the actuator/flap from the exhaust while your car is in sport mode. It will never close again and always be open when you start your car. You will hear the burbles more often then you don't. But it is not possible to predict any way to make the car burble. It depends on the temp of the car and primarily where the fuel is at in the system. If it just experienced some burbles and bangs before shutting down it probably won't on startup. If it didn't, it probably will. But rev it high enough when it's warm and it will do it every time. It's burning off fuel that was pumped into the system but then the RPMs dropped so the motor burns off the extra fuel that the fuel injector pumped in. That's why you never hear the sounds when you accelerate, only the opposite, and why you hear bangs between shifts. Starting the car does the same thing, fuel injectors pump in fuel at startup when the RPMs bump up, the car quickly idles back down and there's where the burbles happen. Last edited by Somnoboost; 08-15-2021 at 11:49 AM.. |
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08-15-2021, 05:47 PM | #16 | |
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08-15-2021, 11:17 PM | #17 |
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08-16-2021, 03:30 AM | #18 |
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If you mean in the car settings, from what I understand this only changes the artificial sound...
https://en.wikipedia.org/wiki/Active_sound_design |
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08-16-2021, 01:13 PM | #19 | |
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08-16-2021, 02:28 PM | #20 | ||
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08-16-2021, 05:57 PM | #21 |
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I know we already had this discussion, but for me, the ASD changes the valve. In fact, it's the only thing that does
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08-17-2021, 09:23 PM | #22 | ||||||
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