10-30-2019, 04:52 PM | #1 |
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high pitched whistle when accelerating lightly
Hi all
Mine's the 2.0 petrol turbo with only 6,000 km on the clock. is it normal to hear a high-pitched whistle (almost like the wastegate sound except without fluttering) while accelerating? I can hear this in underground carparks and even on the open road at low speed with window down. When I release the accelerator the sound stops , and then i hear the wastegate flutter... I never had this on other turbo cars, even on older BMW twin turbo E90. Could it be a problem or is that normal on the newer B48 engines? cheers
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10-31-2019, 04:10 PM | #3 |
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nowhere near as obvious as on the X2. Also it doesn't seem to make the sound when the engine's fully warmed up...
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10-31-2019, 08:04 PM | #4 |
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Hmm I'm not sure what to say if the sound goes away when it's warm.
On all my turbo cars as long as it's quiet enough and on places where it can echo (ie carparks.. tunnels, when driving beside concrete barriers). I can hear the spool very well. If it is also followed by a wastegate/BOV/BPV sound it's really all there is to say about it. The only other thing I could think of is simply the air sucking in the intake noise? It might sound louder when the car is colder because the air is more dense vs when the engine is warmed up it's not so much? Also the cold start increases idle and fuel mixture. |
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10-31-2019, 11:13 PM | #5 |
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I definitely agree with rr.
I could hear the hissing noise, but its only when the car hits the boost (around 3k rpm and above). Then it is followed by BOV once I let the throttle go at higher rpm range. That being said, the noise is consistent throughout the temperature doesn't matter if its cold or warm engine. |
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10-31-2019, 11:25 PM | #6 |
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I'll keep testing (I'm lucky to park at work in a large basement carpark).
But I'm sure I only hear the high pitched whistle on acceleration when cold, not hot. The BOV flutter I hear as soon as I release the throttle, regardless of engine temp. I'm just trying to see if this has any relation to my strong 'lag' when I accelerate from standstill. It's really bad until about 3000rpm then it kicks in with steering wheel tug, etc! Like a damn 1980s turbo. Even worse when AC is on. This problem is really only there after the engine is warm, esp if the car has been parked for a say 20 minutes when hot, and then redriven. Striped - is yours anything like that, or is the acceleration reasonably even from standstill? Even with AC on? cheers
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11-03-2019, 04:28 PM | #7 |
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Interesting, Im curious now since you mentioned about accelerating with and without AC.
Unfortunately, I haven't tested that, but I will let you know how it goes. As for the lag, yeah, not a single doubt. Hows your BMS Pedal Tuner though? Does it help? |
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11-03-2019, 05:49 PM | #8 |
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If it's the lag, it puzzles me why it's relatively okay when engine's cold, but not good when engine's hot. Seems like heat-soak I had in an older turbo car that had a top mount intercooler.
The BMS pedal tuner definetely helps with responsiveness and being able to 'throttle steer'... But doesn't help in the lag from takeoff. Still worth doing. cheers
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11-04-2019, 02:49 PM | #9 |
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Non M35i don’t have bov. It’s in the engine tech manual
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11-04-2019, 07:22 PM | #10 | |
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Speaking of the engine tech manual, I think this section explains the noise. It's a consequence of the design, to enable the catalytic converter to come up to operating temperature quickly, achieving the desired emissions certification.
I added some emphasis. Quote:
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11-04-2019, 09:45 PM | #11 |
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Can we find the Engine Tech Manual online? I'd love to reference it for other aspects. e.g. the difference between US Market 2.0 petrol turbo (169kw) and the rest of the world 2.0 petrol turbo (141kw).
thank you
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11-04-2019, 10:52 PM | #12 |
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I listened to my engine sound again, and perhaps it's more a high-pitched 'hiss' rather than a whistle, which is why I didn't think it was the turbo whine.
It definitely releases a 'flutter' noise when I lift off the throttle suddenly.
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11-05-2019, 05:08 AM | #13 |
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11-05-2019, 05:27 AM | #14 | |
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11-05-2019, 07:35 AM | #15 |
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11-05-2019, 07:40 AM | #16 | |
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Lifting off on the road is another matter. There, it's the wastegate opening, which changes the exhaust flow direction, and also the blowoff opening, which causes the boost to recirculate round'n'round until flushed through the engine. |
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11-06-2019, 06:16 PM | #17 |
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Many thanks Bill!
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11-06-2019, 06:21 PM | #18 | |
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I don't think the US has the B48C engine. Seems to be the rest of the world that has to put up with the lower power engine (141kW). I've been trying to research the physical differences between the US market 2.0 petrol turbo and the rest of the world version Beagler- were you able to find your engine number stamping on the actual engine block? I had a quick look under the hood but I think too much ducting blocks the view of that area... My paperwork quotes a totally different engine number. IIRC something beginning with W but ending in ...K041 cheers S
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11-06-2019, 07:14 PM | #19 | |
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hi TNT, I can accept the wastegate sound (though it's def louder than my old twin turbo 335i), but it's the high pitched 'hiss' when accelerating (before lifting off throttle) that's interesting. I can hear this when driving in the open as well (when my window's open)... cheers
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11-07-2019, 09:05 AM | #20 |
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Realoem calls our engine b48e
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11-10-2019, 07:03 PM | #21 |
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For the 141kW 2.0 petrol turbo (non US), realoem reports the engine type as B48C.
cheers
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