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05-28-2009, 07:20 PM | #23 | |
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Yourself and a few other members seem to agree with one point. That being the beam adjusts according to the suspension (correct me if i assume wrong). Therefore going by your argument: Loading up the back will lower the rear end and a 'normal' cars lights will go up as it is fixed. Now what has been said on here is that the beam will dip and 'correct' itself so as not to blind oncoming traffic. Therefore the same principle would apply to a hill. Your above argument is flawed as going up a hill the rear end is lower than the front ( as with the loading of people argument) therefore a xenon light should therefore LOWER its beam so as not to blind oncoming traffic - your argument says it will go up. And vice versa will also happen going downhill eg as you say with the braking/hard braking - the front of the car dips - the lights move up. Down a hill the front end is lower than the back - lights go up. If you think about it for a sec or even get out a toy car and think about the height of the beam according to front and rear height of the car you will see that indeed what ive said makes sense. So yes I agree with the braking accelerating and front/rear suspension affecting the beam height - but this argument will also ring true for a hill. Think of it in the same was as a self levelling rear supension. No matter how much you load into the rear the car will still be at a pre determined height. The same applies for the xenon lights. There is a self levelling mechanism so that it always points at a predetermined level from the flat (within the mechanical limitations of how far the lens can actually move). Therefore the lights are indeed self levelling. I hope you guys can understand my ramblings!!! |
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05-28-2009, 07:57 PM | #24 | |
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This is where you're going wrong. On a hill, the road is going up, the car is pointing up, and the lights are still on the same plane as they would be under normal driving conditions. There's no reason whatsoever for the headlights to react to a hill, up or down. The cars driving on the road are seeing the lights in exactly the same way as they would be on flat ground, because they're on the same plane as the road. The angle of the chassis doesn't change (significantly) when you're on a hill. |
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05-28-2009, 07:59 PM | #25 | |
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It does NOT keep parallel to the changing road surface - it is only parallel to the initial flat piece of road that BMW have set it to. Think of it in terms of a spirit level. The spirit level has to be calibrated to a reference point. So from this spirit level analogy it is from the reference level that the car knows what the suspension and gradients are doing, therefore adjusting correctly and keeping the 'spirit level' (beam height) parallel to the reference flat ground. |
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05-28-2009, 08:09 PM | #26 | |
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The suspension doesn't change when you're going up a hill. If you take a flat surface with the car sitting on it, and tilt it upwards, the lights are still parrallel to the surface, which is the goal of the lighting system. "Level" has nothing to do with it. If the road is at an angle, the car is at an angle, and the lights are at the same angle. If you stomp the brakes, the angle of the car changes, and the lights adjust to compensate for it. There's no reason for the lights to adjust on a hill. |
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05-28-2009, 08:20 PM | #27 | |
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You argue that if you tilt the car up the lights are still parallel to the ground - so what has the lights done in reference to the plane of the car? it has tilted its lights down yes? in order to keep it parallel to the ground. Now replace the air between the ground and however much you have tilted the front of the car up by ? and what do you get? indeed the light has tilted down from the plane of the car. Look at the diagrams and you can see what I mean hopefully |
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05-28-2009, 08:25 PM | #28 |
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So as you can see from the diagrams you are contradicting yourself.
You explain that diagram 1 + 2 is what happens but then you say that diagram 3 does not happen and therefore it is contradicting diagram 2. anyone else wanna chime in here? In the hill argument if it is parallel to the road then how can diagram 2 be?? The lights therefore are moving according to a REFERENCE point. |
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05-28-2009, 08:26 PM | #29 | |
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The last figure is COMPLETELY wrong. You left out the wheels! The car simply doesn't do that. The last few seconds of the video I posted early was taken on a 13% grade. Did it look like the lights were aiming straight at the road? No, they're not, and they're also not on cars that don't have adaptive headlights. |
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05-29-2009, 01:05 AM | #30 | |
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So far I have given you reasons and why. You have only offered: it is this way and it is NOT that way. Where is your reasoning? Can you not see that your argument is flawed when you break down the principles you are applying it all on? Someone help me out here I would be more interested in your reasoning rather than just it doesnt work that way. |
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05-29-2009, 07:22 AM | #31 | |
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I've explained it to you several times. The plane of the headlights compared to the road DOES NOT CHANGE when you are on a hill, so why would the adaptive system adjust? The hill points up, the road points up, and the car points up, with the headlights staying at exactly the same parrallel to the road as they were on level ground. It's been explained several times already, you refuse to accept it. Last edited by jeremyc74; 05-29-2009 at 08:23 AM.. |
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05-29-2009, 08:06 AM | #32 | |
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Perhaps BMW has a different leveling system in Australia?? Tom |
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05-29-2009, 09:16 AM | #33 | |
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The pics on the link worked at home and I've found the screw. simple fix! thanks all. 'let there be light!' |
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05-29-2009, 12:11 PM | #34 | |
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The reason is the "reference" of what is "level". In your first pic, the car is level with the road, in the 2nd pic the car is still level with the road, the 3rd shows the car level with the road, and the lights are NOT level at all. "Level" does not mean level with the horizon. It means, level with the road. So, going up a hill you are still level with the road, the road is simply at a 5% grade, or whatever grade the hill is. Also, the suspension, going up or down a hill, is still 'level' with the road surface. The lights need to be level with the road surface, not the horizon. There is no use for headlights to dip down if you are going uphill. What benefit is there to that? There isn't. In fact, it makes things worse because now the lights will not light up the road as they should. Just like if you are going downhill, what good is it for the headlight to now point upward? The road is not being illuminated and you're pointing your lights more towards the oncoming drivers eyes. A good question is; how does the system decide what is "level". Is it using horizon, or is it using the suspension relative to the road surface, regardless of it's incline or decline to the horizon. Maybe older systems dipped or raised the lights because they were calibrated to horizon level. And, the new system is more sophisticated in that it knows what is "level" in relation to the car on the road. So, if the lightsf are going up and down according to road level grade, that would be counterproductive in my view, meaning it's not a smart design. In my A4 I do not notice the lights going up or down with hills. Accel and decel will cause them to level, as will bigger bumps and such. The greatest effect is of course their ability to turn left and right along with your steering wheel. At first I thought this is simply overkill and novelty. In practice, I can say that it's actually a bit helpful. I could live without it for sure, but it does offer some extra lighting in turns. If I had to pay extra for the xenons to do that, I wouldn't. But, that's how come as a package. |
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05-29-2009, 12:17 PM | #35 | |
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The 135i has sensors mounted to the front and rear suspension to sense the overall angle of the car relative to the road. |
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05-29-2009, 12:35 PM | #36 |
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