R1250RT Induction noise under heavy throttle - BMW Luxury Touring Community
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post #1 of 24 Old Mar 21st, 2019, 11:50 pm Thread Starter
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R1250RT Induction noise under heavy throttle

Hi All

Not having owned an RT before I was curious about how the my new 1250 engine sounds under acceleration. When using gentle to medium throttle the engine is very quiet even when using heavy throttle down low. But once the needle swings past 4000rpm it gives of quite a loud deep growl sounding like induction noise from under the tank area.
Is this common to Rt's or possibly the new ShiftCam taking over moving from the low to high lift on the cam.

Any other 1250/1200 riders notice this?
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post #2 of 24 Old Mar 22nd, 2019, 5:14 am
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Re: R1250RT Induction noise under heavy throttle

I can only spitball and say you are hearing the full sound of the exhaust as the exhaust flap opens fully at higher throttle position.

It is a little sound deterrent that is built into the exhaust to help quiet the bike and is closed semi closed at lower RPM/throttle position and fully open under WOT or higher throttle openings.

I'll take your problem sounds like it would be music to my ears
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post #3 of 24 Old Mar 22nd, 2019, 7:39 am
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Re: R1250RT Induction noise under heavy throttle

First-time 1250RT owner here too. I'm partially deaf so I might not notice it as much as you do, but ased on things I've read, the Shift Cam works its magic around 5000 RPM under normal loads. So if that's when the sound starts it might be related. I guess under hard acceleration you'd make it from 4K to 5K RPM pretty quickly, so you might be on to something. Otherwise, perhaps as LAF suggests, the changing exhaust port affects the resonance of the whole system.
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post #4 of 24 Old Mar 22nd, 2019, 9:32 am
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Re: R1250RT Induction noise under heavy throttle

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Originally Posted by nox273 View Post
Is this common to Rt's or possibly the new ShiftCam taking over moving from the low to high lift on the cam.

Any other 1250/1200 riders notice this?
I have ridden both and the noise is pretty much identical on both bikes all the way up to the endstops.

As LAF said, I am pretty sure you are not hearing induction noise, but the exhaust flap opening and you are hearing the engine sing from the back end.

2003 R1150RT & 2017 R1200RT
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post #5 of 24 Old Mar 22nd, 2019, 10:48 pm Thread Starter
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Re: R1250RT Induction noise under heavy throttle

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Originally Posted by LAF View Post
I can only spitball and say you are hearing the full sound of the exhaust as the exhaust flap opens fully at higher throttle position.

It is a little sound deterrent that is built into the exhaust to help quiet the bike and is closed semi closed at lower RPM/throttle position and fully open under WOT or higher throttle openings.

I'll take your problem sounds like it would be music to my ears
This sounds exactly what I am hearing. Scooter to a sports bike in a couple of seconds.
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post #6 of 24 Old Mar 22nd, 2019, 11:12 pm
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Re: R1250RT Induction noise under heavy throttle

Once your out of town, keeping you bike above or near 4K RPM is a good thing, don't lug it. You may be surprised what it does above 6K rpm.

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post #7 of 24 Old Mar 22nd, 2019, 11:13 pm
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Re: R1250RT Induction noise under heavy throttle

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Originally Posted by nox273 View Post
Hi All

Not having owned an RT before I was curious about how the my new 1250 engine sounds under acceleration. When using gentle to medium throttle the engine is very quiet even when using heavy throttle down low. But once the needle swings past 4000rpm it gives of quite a loud deep growl sounding like induction noise from under the tank area.
Is this common to Rt's or possibly the new ShiftCam taking over moving from the low to high lift on the cam.

Any other 1250/1200 riders notice this?
And the problem is...
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post #8 of 24 Old Mar 23rd, 2019, 6:06 am
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Re: R1250RT Induction noise under heavy throttle

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Originally Posted by Ponch View Post
And the problem is...
He has a 1250 and I don't?

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post #9 of 24 Old Mar 23rd, 2019, 7:53 am
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Re: R1250RT Induction noise under heavy throttle

Not a Certified Master BMW Technician however, feel quite safe in stating, "They all do that."


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post #10 of 24 Old Apr 1st, 2019, 5:36 pm
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Re: R1250RT Induction noise under heavy throttle

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Originally Posted by Motodan View Post
Not a Certified Master BMW Technician however, feel quite safe in stating, "They all do that."
Apologies for hijacking this thread

I have a problem at the other end of the scale, my 1250 has a high pitch rattle just as you roll on throttle, I took it back to the dealer almost immediately and got the 'they all do that' response

I mentioned in another thread that it sounds a lot like the old pre-ignition.

I can hear it even above the radio and to say it 'jangles my nerves' is an understatement, I have grown to hate the noise my bike makes, my 14 plate was much nicer.

Anyone else experience anything like this, certainly the demo bike I had out didnt make this noise, I had hoped it would calm down with some mileage but it isnt going away.
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post #11 of 24 Old Apr 1st, 2019, 5:47 pm
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Re: R1250RT Induction noise under heavy throttle

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Originally Posted by heli_madken View Post
Apologies for hijacking this thread

I have a problem at the other end of the scale, my 1250 has a high pitch rattle just as you roll on throttle, I took it back to the dealer almost immediately and got the 'they all do that' response

I mentioned in another thread that it sounds a lot like the old pre-ignition.

I can hear it even above the radio and to say it 'jangles my nerves' is an understatement, I have grown to hate the noise my bike makes, my 14 plate was much nicer.

Anyone else experience anything like this, certainly the demo bike I had out didnt make this noise, I had hoped it would calm down with some mileage but it isnt going away.
I would keep filling it with 93 octane gas every chance I got a gallon at a time if I had to. I also would add a bottle of Techron fuel treatment.

Since I now understand they have added the knock sensor back to the 1250 motor it might be bad fuel.

You have to ask what kind and fuel and what octane your dealer is throwing into each bike it sells.

Lee
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post #12 of 24 Old Apr 2nd, 2019, 1:11 am
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Re: R1250RT Induction noise under heavy throttle

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Originally Posted by LAF View Post
I would keep filling it with 93 octane gas every chance I got a gallon at a time if I had to. I also would add a bottle of Techron fuel treatment.
.
Thanks for your help, yes last two tanks have been high octane, it doesn't seem to have made any difference, I will try the Techron though. I also feel that the bike is very 'buzzy' at motorway speeds and at idle the screen shakes more violently than my old bike although I am hoping these two elements are due to the engines low mileage.
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post #13 of 24 Old Apr 2nd, 2019, 3:59 am
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Re: R1250RT Induction noise under heavy throttle

Quote:
Originally Posted by heli_madken View Post
Apologies for hijacking this thread

I have a problem at the other end of the scale, my 1250 has a high pitch rattle just as you roll on throttle, I took it back to the dealer almost immediately and got the 'they all do that' response

I mentioned in another thread that it sounds a lot like the old pre-ignition.

I can hear it even above the radio and to say it 'jangles my nerves' is an understatement, I have grown to hate the noise my bike makes, my 14 plate was much nicer.

Anyone else experience anything like this, certainly the demo bike I had out didnt make this noise, I had hoped it would calm down with some mileage but it isnt going away.
If the dealer's demo bike didn't make the noise, then clearly their response "they all do that" is unacceptable. I would be taking the demo bike out again to confirm things, then take a much harder line with the dealer. It's a pretty sad state of affairs that you say you have grown to hate the noise your bike makes. A new (and expensive) bike should make you happy - or what's the point..

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post #14 of 24 Old Apr 2nd, 2019, 5:38 am Thread Starter
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Re: R1250RT Induction noise under heavy throttle

Quote:
Originally Posted by heli_madken View Post
Thanks for your help, yes last two tanks have been high octane, it doesn't seem to have made any difference, I will try the Techron though. I also feel that the bike is very 'buzzy' at motorway speeds and at idle the screen shakes more violently than my old bike although I am hoping these two elements are due to the engines low mileage.

My 1250 engine is very quiet with no high pitch rattles etc. (I only detect a change in engine tone when the exhaust fan fully opens around 4000 rpm) It is also very smooth at highway speeds. I only get a little shaking of the screen when the bike is idling and the screen is fully up, but I wouldn't call it violent.

Take your bike in and demand they take a look at it and at least compare it to another bike or demo unit.
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post #15 of 24 Old Apr 10th, 2019, 3:16 pm
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Re: R1250RT Induction noise under heavy throttle

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... It is a little sound deterrent that is built into the exhaust to help quiet the bike and is closed semi closed at lower RPM/throttle position and fully open under WOT or higher throttle openings...
It is my understanding that the primary purpose of the flap is to improve the engine power output by adjusting exhaust backpressure as needed. Freer/freest flowing above 4-5k and partially restricted to increase backpressure below 4k to improve low-end torque.
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post #16 of 24 Old Apr 10th, 2019, 4:14 pm
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Re: R1250RT Induction noise under heavy throttle

I think that is the primary purpose, but it does help with noise abatement around town.

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post #17 of 24 Old Apr 11th, 2019, 9:56 am
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Re: R1250RT Induction noise under heavy throttle

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It is my understanding that the primary purpose of the flap is to improve the engine power output by adjusting exhaust backpressure as needed. Freer/freest flowing above 4-5k and partially restricted to increase backpressure below 4k to improve low-end torque.
Having had two of these flaps replaced (new headers), the tech told me, its purely for emissions and noise, and doesn't do anything for performance or torque. He said if it was stuck open, there would be no issues whatsoever with the bike apart from it throws a code as its tested during initial switch on, so the mothership knows if it's stuck. I experienced no change to how the bike performed when mine was stuck open. But that is obviously seat of the pants and not measured technically
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post #18 of 24 Old Apr 14th, 2019, 10:35 am
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Re: R1250RT Induction noise under heavy throttle

Quote:
Originally Posted by heli_madken View Post
Apologies for hijacking this thread

I have a problem at the other end of the scale, my 1250 has a high pitch rattle just as you roll on throttle, I took it back to the dealer almost immediately and got the 'they all do that' response

I mentioned in another thread that it sounds a lot like the old pre-ignition.

I can hear it even above the radio and to say it 'jangles my nerves' is an understatement, I have grown to hate the noise my bike makes, my 14 plate was much nicer.

Anyone else experience anything like this, certainly the demo bike I had out didnt make this noise, I had hoped it would calm down with some mileage but it isnt going away.
My bike has done 75 miles, and I think I have the same noise your talking about. On light throttle it sounds like the engine in pinning, slight rattle, but as you accelerate it goes away. I'll keep an eye on it, but don't think its anything to worry about, just sound different
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post #19 of 24 Old Apr 14th, 2019, 11:19 am
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Re: R1250RT Induction noise under heavy throttle

Also I have just realised, I didn't hear the noise when I picked my bike up, it had the sport windscreen on it. Once I got home, I put a Werks screen back on and then I heard the rattle. So I assume as the windscreen makes for a quieter ride, I'm now hearing more of the engine/transmission or whatever. I let my mate ride it yesterday for 40 miles, he rides a F800 and didn't notice anything, so I think its just a different noise to the 1200
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post #20 of 24 Old Apr 14th, 2019, 11:32 am
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Re: R1250RT Induction noise under heavy throttle

Thanks Casbar,

Yes the first 1/4" of throttle in any gear just as the engine takes up load, light rattle which goes away as the revs pick up

My bike went in for its first service on Friday so I took the opportunity to talk to the service head again, he heard the noise himself the last time I asked about it on his test run but the mechanic who took it out this time could hear nothing. So needless to say I didnt get anywhere, both stated the bike is perfect.

I have ridden two other 1250's that dont make the same noise, perhaps our bikes are Friday afternoon jobs on the production line

I am sure mechanically there is nothing wrong with our bikes its just the particular noise it makes annoys me.
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post #21 of 24 Old Apr 14th, 2019, 11:41 am
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Re: R1250RT Induction noise under heavy throttle

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Originally Posted by heli_madken View Post
Thanks Casbar,

Yes the first 1/4" of throttle in any gear just as the engine takes up load, light rattle which goes away as the revs pick up

My bike went in for its first service on Friday so I took the opportunity to talk to the service head again, he heard the noise himself the last time I asked about it on his test run but the mechanic who took it out this time could hear nothing. So needless to say I didnt get anywhere, both stated the bike is perfect.

I have ridden two other 1250's that dont make the same noise, perhaps our bikes are Friday afternoon jobs on the production line

I am sure mechanically there is nothing wrong with our bikes its just the particular noise it makes annoys me.
I'm not worried, I'll see how it goes, love the bike and the engine
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post #22 of 24 Old Yesterday, 9:56 am
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Re: R1250RT Induction noise under heavy throttle

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Originally Posted by heli_madken View Post
Thanks Casbar,

Yes the first 1/4" of throttle in any gear just as the engine takes up load, light rattle which goes away as the revs pick up

My bike went in for its first service on Friday so I took the opportunity to talk to the service head again, he heard the noise himself the last time I asked about it on his test run but the mechanic who took it out this time could hear nothing. So needless to say I didnt get anywhere, both stated the bike is perfect.

I have ridden two other 1250's that dont make the same noise, perhaps our bikes are Friday afternoon jobs on the production line

I am sure mechanically there is nothing wrong with our bikes its just the particular noise it makes annoys me.
Have you got the standard can on it? I just realised why I didn't hear anything when I rode the bike home, I had my ear plugs in and when I did hear it yesterday I was riding without plugs Thats obviously the answer, wear my ear plugs
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post #23 of 24 Old Today, 1:03 pm
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Re: R1250RT Induction noise under heavy throttle

Yes standard can, the noise to me comes from the front of the engine and is separate to the normal mechanical noise.

As suggested by LAF I tried some Techron yesterday, could be my imagination but it does seem to have eased the noise a little.

Earplugs!, My own current solution is to listen to music perhaps a little louder than I used to
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post #24 of 24 Old Today, 1:13 pm
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Re: R1250RT Induction noise under heavy throttle

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Originally Posted by heli_madken View Post
Yes standard can, the noise to me comes from the front of the engine and is separate to the normal mechanical noise.

As suggested by LAF I tried some Techron yesterday, could be my imagination but it does seem to have eased the noise a little.

Earplugs!, My own current solution is to listen to music perhaps a little louder than I used to
I am hearing the same thing, but went out yesterday and did another 50 or so miles and it appeared to not be as bad, or I'm getting used to it. It almost sounds to me like the pads rumbling in the front calliper, a kind of rattle. But as I said its getting less and less, so I'll wait and see what happens. I've got an Akra can on mine, so I was wondering if that was having an impact, but its not
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