RE: Chris Harris video: Noble M600 and Atom V8
Discussion
monthefish said:
Another great video.
Chris is a really nice guy I thought. I was surprised more people didn't ask for a passenger lap. neilski said:
I met Chris in the Pistenklaus after the first day of filming and the following day he took me round in the Noble and it was every bit as good as he says it is and then some! Definitely a motoring highlight for me.
If you're reading this, thanks again Chris.
Lucky bugger!If you're reading this, thanks again Chris.
Video here of a passenger ride in the new orange M600, it sounds a lot better in this one than in Chris's vid. Really does sound great:
http://www.youtube.com/watch?v=Sl2T-oQ9KTk
http://www.youtube.com/watch?v=Sl2T-oQ9KTk
Japveesix said:
Video here of a passenger ride in the new orange M600, it sounds a lot better in this one than in Chris's vid. Really does sound great:
http://www.youtube.com/watch?v=Sl2T-oQ9KTk
Great clip!http://www.youtube.com/watch?v=Sl2T-oQ9KTk
Makes me wonder why M5 F10M can't sound about as nice...
Japveesix said:
Video here of a passenger ride in the new orange M600, it sounds a lot better in this one than in Chris's vid. Really does sound great:
http://www.youtube.com/watch?v=Sl2T-oQ9KTk
Love it. Sounds proper.http://www.youtube.com/watch?v=Sl2T-oQ9KTk
LandingSpot said:
The noise is commonly referred to as wastegate chatter, but it is in fact a myth. The sound is caused by the compressed air flowing backwards through the compressor wheel of the turbo as the throttle is closed. Partial or full closures produce differently pitched noises and it is impressive how loud it can get. The M600's air intake system is probably relatively shielded from the cabin and the sound is more in the background than it would be for a car with less sound deadening between the engine bay and the cabin. I don't know how much sound deadening separates the engine bay and the cabin, nor can I quantify the volume of the sound the Noble makes.
It is not unheard of for external wastegates (commonly seen on competition cars with large turbos, but also used in road applications also) to be audible, but it is not this sound.
For a turbo with the wastegate housed internally, any noise emitted by it clapping shut repeatedly would be muffled by the exhaust system. This clapping is apparently also possible as the turbo reaches the boost threshold, but thinking about the operation of this I cannot understand what would cause the actuator to act in this way.
The term "wastegate chatter" does sound cool though (even though it is not correct) which is perhaps why the term has stuck amongst motoring discussions.
Etided for speeling
The fact that wastegate chatter gets mentioned during reviews to large audiences also helps perpetuate the myth...
http://www.youtube.com/watch?v=ONVZ8QFTnb4
Whilst you have a lot more knowledge on the subject than me, are you sure that the noise on the vid is going to be caused by the compressed air flowing backwards through the compressor? I know a lot of 'boy racers' used to try to get this to happen to recreate the sound, but I doubt Noble allow it to happen, as that will stall the turbine and can actually cause serious damage to the vanes.It is not unheard of for external wastegates (commonly seen on competition cars with large turbos, but also used in road applications also) to be audible, but it is not this sound.
For a turbo with the wastegate housed internally, any noise emitted by it clapping shut repeatedly would be muffled by the exhaust system. This clapping is apparently also possible as the turbo reaches the boost threshold, but thinking about the operation of this I cannot understand what would cause the actuator to act in this way.
The term "wastegate chatter" does sound cool though (even though it is not correct) which is perhaps why the term has stuck amongst motoring discussions.
Etided for speeling
Edited by LandingSpot on Friday 20th April 13:53
The fact that wastegate chatter gets mentioned during reviews to large audiences also helps perpetuate the myth...
http://www.youtube.com/watch?v=ONVZ8QFTnb4
Edited by LandingSpot on Friday 20th April 20:15
In this case, I suspect that it is the wastegates, or the DV's blowing off boost to avoid stalling the compressor wheel.
AbarthChris said:
Whilst you have a lot more knowledge on the subject than me, are you sure that the noise on the vid is going to be caused by the compressed air flowing backwards through the compressor? I know a lot of 'boy racers' used to try to get this to happen to recreate the sound, but I doubt Noble allow it to happen, as that will stall the turbine and can actually cause serious damage to the vanes.
In this case, I suspect that it is the wastegates, or the DV's blowing off boost to avoid stalling the compressor wheel.
Recirculating BOV's fitted to the Noble, but a little of the compressed inducted charge air slips back through the turbos causing a slight stall and thus the noise you hear in the Vid.In this case, I suspect that it is the wastegates, or the DV's blowing off boost to avoid stalling the compressor wheel.
People will have you believe that this will destroy your turbo instantly. Bear in mind the environment that a turbo is designed to run in. Massive temperatures, extreme speeds and a few bits of dirt for good measure. A little bit of slow air isn't going to kill it.
Another urban myth. Hope that helps clear up the "wastgate" noise conundrum
JSquaredJim said:
Recirculating BOV's fitted to the Noble, but a little of the compressed inducted charge air slips back through the turbos causing a slight stall and thus the noise you hear in the Vid.
People will have you believe that this will destroy your turbo instantly. Bear in mind the environment that a turbo is designed to run in. Massive temperatures, extreme speeds and a few bits of dirt for good measure. A little bit of slow air isn't going to kill it.
Another urban myth. Hope that helps clear up the "wastgate" noise conundrum
Cheers Jim! always good to get more info People will have you believe that this will destroy your turbo instantly. Bear in mind the environment that a turbo is designed to run in. Massive temperatures, extreme speeds and a few bits of dirt for good measure. A little bit of slow air isn't going to kill it.
Another urban myth. Hope that helps clear up the "wastgate" noise conundrum
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