01-08-2013, 02:54 AM | #45 | |
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It could also be a factor in why the front sensors work better than the rears... I should
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01-08-2013, 03:39 AM | #46 |
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My rear sensors 'dance' when they're spotlessly clean
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01-08-2013, 06:38 AM | #47 |
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Slightly off topic but I find the front sensors very handy. I don't know what is with this car but I find the front very difficult to judge. Without the sensors I think I'm right up against something and I'm miles off.
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01-08-2013, 08:43 AM | #48 |
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Agreed - only done 800 miles so it's all still new to me but the front feels closer to the obstacle than it actually is.
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01-09-2013, 05:59 AM | #49 |
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Yep me too... Usually very good at judging distances etc..
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01-10-2013, 08:39 AM | #50 |
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Having looked at the photograph of the offending wooden post and the advice contained on Page 118 of the Owner`s Handbook, warning of the limits of ultrasound measurement, including a thin or wedge shaped objects, the following thought may be relevant.
Could it be that almost all of the Ultrasound beam was reflected away from and not received back by the relevant sensor, due to the shape of the post. That would mean that on its own, the thin leading edge of the post was borderline in respect of the signal strength received back by the sensor. I am not sure how Ultrasound works compared with Radar but assuming similarites, military Stealth Aircraft and Ships produce a very small radar return, partly based on the the special angled shape of the bodywork. This may or may not help to support the above theory. Standing by to be shot down by experts!! |
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01-10-2013, 09:27 AM | #52 | |
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You'll be OK if you hide behind a post..
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02-03-2013, 05:32 PM | #54 |
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The sensors on my F30 hire car are ok.. seem reasonably accurate.
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02-04-2013, 01:56 AM | #56 |
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Here's one option - http://www.bimmer-tech.net/shop/bmw-...sist-retrofits
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02-04-2013, 01:05 PM | #58 |
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Just a note. Its sometimes 0C sometime -10C and rear sensors are acting damn strange . Even with clean car , with no ice or snow or dirt on them. Sometimes 1 or all together show full coverage (as something is fully in contact)
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