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Riccardo
Member Since: 20 Feb 2010
Location: Porto (was Kent)
Posts: 4123
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Spooky wrote:The rear air springs are a larger diameter than the fronts, meaning that (with an unloaded car) the pressure in the rear is lower. Because of this, the air from the reservoir will expand more when entering the rear springs then when entering the front, causing a quicker response.
You should find the car raises more evenly when loaded ...
Thanks
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 14th Apr 2010 7:11 am |
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PaulP
Member Since: 04 May 2007
Location: Barcelona
Posts: 4317
  
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Spooky wrote:Because of this, the air from the reservoir will expand more when entering the rear springs then when entering the front, causing a quicker response.
I'm not too sure that this is the reason Spooky....
Whilst it's true that the diameters are different, the front and rear valve blocks are also different in relation to the internal size of their valves. This is to account for the differences in the air spring sizes and loading on each axle that you mention.
Spooky wrote:You should find the car raises more evenly when loaded ...
I've tested this a few times (some time ago) with around 300+kg of weight in the boot and also with a trailer attached and the rear has always risen first and lowered last.
Saying that sometimes it is more apparent than others and the effect is less noticeable when loaded. 
I'm almost 100% sure that the assymetric raising/lowering is to prevent the headlamps from pointing upwards at any point....as we know the lighting regulations are very strict as far as levelling goes for HID light sources such as the bi-xenons and I'm sure it would have needed some type of strategy to avoid dazzling anyone on the road in order to get type approval.
2006 Discovery 3 TDV6 SE Auto Buckingham Blue
2007 Golf GT DSG
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| 14th Apr 2010 8:12 am |
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Riccardo
Member Since: 20 Feb 2010
Location: Porto (was Kent)
Posts: 4123
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So really a "safety" measure
I find just a little bit annoying the feeling you have when the back is higher than the front but if it is normal that is not an issue
Just wanted to be sure there was nothing wrong with the system in my car
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| 14th Apr 2010 9:19 am |
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dick dastardly
Member Since: 29 May 2007
Location: wiggleigh bottom
Posts: 1112
 
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theoretically in an open system, pressure differences will even out meaning that the larger volume at the back will take longer to fill so should come up last. This system however has valves and a controller and has been specifically designed for the rear to raise first because of what PaulP said and getting the lowest point of the car (rear diff / exhaust) off any grounding point first. There's one wheel on my wagon, but i'm still rollin' along, it's the cherokee, they're after me, but I'm singing a happy song
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| 14th Apr 2010 2:11 pm |
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