A4Quattro said:
You clearly do care otherwise you'd not bother replying
Let me spell it out for you. I do not give a toss about how my wiper systems work nor do I give a toss about your understanding of wiper systems. What I do give a toss about is arrogant people such as yourself telling me that I'm posting "####". It was this that prompted my response.
as for my understanding of wipers, I have had several different car's wiper systems to pieces so I think I have a good understanding. Have you ever held a spanner in your hand other than to feel good about yourself at halfords?
Any point to this utter irrelevance? As I said, your knowledge of wiper systems in modern cars is obviously lacking as you claim that things I have
witnessed with my own eyes are impossible.
This thread never mentioned automatic wipers anywhere, I understood it to be about wipers in general, hence my post.
I only mentioned automatic wipers to emphasise that, when operating in this mode, the speed can be modulated by the onboard systems with a finer degree of control than is available via the stalk (i.e. slow/fast). The actual motors and control mechanisms will be the same regardless of whether you have automatic (i.e. rain-sensing) wipers, the latter is just an additional mechanism whereby the car can sense the water and activate the wipers itself. The computer would obviously still have the same ability to modulate the speed of the wipers without the rain-sensors, it's just that the user controls (i.e. the stalk) doesn't permit such finesse.
nor do the wipers move any slower on the last wipe. Do I have a special car then?
The wipers on my last car did not perform the last downstroke at a slower speed, instead they performed an additional wipe a few seconds after the initial wash-wipe sweeps (although I believe this was a programmable setting). I believe both systems were intended to prevent splashing of water on the screen after a wash-wipe cycle. The old system tried to achieve this by leaving it a few seconds and then performing a final wipe whereas they've now decided that a slower final downstroke does a better job. Depending on when this was changed, this could explain why your car doesn't have the slower final downstroke. Of course it could be that this feature is only present on A3s, I have no idea. All I know is that it's real and I've witnessed it.
How does a wiper on a glass screen cause splashing? especially as it wipes twice after the washers have stopped.
So every time you use the wash-wipe, there is no water left on the screen
at all, even when travelling at high speed? If so then you do indeed have a miraculous car as every car I've ever had tends to leave a few little splashes here and there after a wash-wipe cycle, especially at speed. The water tends to get onto the wipers themselves and then gets blown off onto the screen as droplets and splashes. As this water is falling behind the sweeping wiper blade, it doesn't get cleaned up.
