10-19-2011, 09:46 PM | #133 |
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In my car it comes and goes. I can nudge the gas a little and it will go away. It will stay away and then come back. Other times, It is always there and sometimes in never happens. It is very inconsistent. Every test drive is at least 20 miles to warm it up, then see if it will drone or not.
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10-20-2011, 06:45 PM | #134 | |
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Mine I just on all the time. |
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10-20-2011, 06:54 PM | #135 |
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I was picking up the new X3 yesterday and the old Service Manager was back helping out as one of their staff is away (he was promoted ). Had a chat to him and he's going to test drove with me. He said as it is in every gear in the same rev range at the same load, it is more than likely to be the exhaust. He is going to loosen everything up, run the car and re tighten everything to see if it solves the problem as that often does. I will keep you guys posted.
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10-25-2011, 11:31 AM | #137 |
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So, for those of you who did the insulation in the trunk, did it also deaden the normal "nice" sound in the other gears? Or did it selectively delete the higher-gear drone issue? I was just wondering this morning if the nice tone we hear going through the gears will be muffled away with that fix.
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10-25-2011, 08:05 PM | #138 | |
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10-25-2011, 08:08 PM | #139 | |
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10-26-2011, 09:21 AM | #140 | ||
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Unfortunately, they probably only have Germany's cruising speed in mind where there is no drone.
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10-26-2011, 09:50 AM | #141 |
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Reducing drone go get a 128i
I can hear what you guys are saying but its an ///M would you rather it be quiet SMH. I Cant wait for an exhaust on mine |
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10-26-2011, 11:17 AM | #142 | |
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Hopefully DINAN has a solution in the works!
I posted this in the 'Drone Poll' thread and I thought I would added it here, hope this gives some insight to the designing/developing approach to drone:
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10-26-2011, 12:29 PM | #143 | ||||||
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So we know what to work with, here ...
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By itself tightening the pipes might help, BTW, if it reduces amplitude (through making it more difficult for the materials to vibrate). Quote:
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Changing the size/materials/mounting/etc. is what controls the frequency of the resonance ("pitch") and amplitude ("volume"). TMI here, for sure. |
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10-26-2011, 05:22 PM | #144 |
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I rather it be louder. I also rather it had no drone.
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10-31-2011, 09:45 AM | #145 |
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new exhaust
The drone completely gone.
I’ve had my new exhaust on the car for a while now and it has settled in and sounding a bit deeper than at first. Maybe the best way to describe it is that it works the same way as the Akrapovic BMW X5M (mine is similar to the picture on their website) and probably the same as their 1M although I haven’t yet seen a picture of that. The difference in mine is that the valves are actuated by the turbo boost and not electronically. This means that when you put your foot down a bit the valves open and the exhaust flow by-passes the back box and exits straight out through the outer two tips and the noise is brilliant. Normally the flow goes through the rear box and actually is slightly quieter than standard but certainly deeper with wuffles and pops. The other difference in the system is the two secondary cats have been taken out and the centre silencer replaced by one slightly larger. Instead of a single pipe exit from this new centre box there’s now two pipes back to the rear. They said the size of this box is optional according to what noise levels you’re looking for. This was made by BCS Automotive who are based in St Helens and the four hour drive down there from Perth was certainly worthwhile. They've got a video www.bcsautomotive.co.uk My insurance people said ok and no extra premium and that was a surprise. Dealer knows and not bothered. So, relatively quiet when I want or WTF if I feel like it. All this and no drone - happy me. Great outcome. Last edited by johnsfb; 11-01-2011 at 05:13 AM.. |
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12-01-2011, 08:28 AM | #147 |
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BCS automotive will sell direct to US customers at a very good price for now. Set up includes throttle controlled valve.
Eager to try out. Also they are testing with a GIAC engine tune. |
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