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      01-08-2013, 03:54 AM   #45
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Quote:
Originally Posted by zofinger View Post
Couple of thoughts 1) if it helps you can adjust the volume of the PDCs so they're not quite so 'overbearing' and 2) this if the first time i've had PDC's so have no experience to lean on, but the manual does note the sensors functionality could be impacted if they are dirty? Wonder if this was part blame for not seeing that huge post...
I think you may be on to something! As you can see from the pictures, my car was pretty dirty.

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, 04:39 AM   #46
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My rear sensors 'dance' when they're spotlessly clean
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      01-08-2013, 07:38 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, 09:43 AM   #48
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Originally Posted by rich1068 View Post
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.
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, 06:59 AM   #49
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Quote:
Originally Posted by zofinger View Post
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.
Yep me too... Usually very good at judging distances etc..
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      01-10-2013, 09:39 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, 10:07 AM   #51
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You sound like you know what you're talking about. That's good enough for me!
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      01-10-2013, 10:27 AM   #52
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Quote:
Originally Posted by Signpost View Post
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!!
Ah 'Stealth Post fools BMW Technology'... I think you may be on to something! Good analysis!

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Standing by to be shot down by experts!!
You'll be OK if you hide behind a post..
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      02-03-2013, 01:14 PM   #53
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I added the rear camera, for a little extra reassurance.
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      02-03-2013, 06:32 PM   #54
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The sensors on my F30 hire car are ok.. seem reasonably accurate.
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      02-03-2013, 07:17 PM   #55
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Quote:
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I added the rear camera, for a little extra reassurance.
"added" as in retrofit? Do tell us more, please.
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      02-04-2013, 02:56 AM   #56
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Quote:
Originally Posted by claykin View Post
"added" as in retrofit? Do tell us more, please.
Here's one option - http://www.bimmer-tech.net/shop/bmw-...sist-retrofits
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      02-04-2013, 02:59 AM   #57
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Quote:
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"added" as in retrofit? Do tell us more, please.
Sorry it was a factory fitted option.
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      02-04-2013, 02:05 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)

Damn bmw
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