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Old 24 May 2012, 04:19   #21
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Why's that? The air strut itself doesn't control the geometry, just the springing medium and the damping.
I imagine it's because all the energy it's transferred straight to the tyres and none is taken up in the spring.

My Defender 90 Td5 original tyres lasted 70k, and still had tread on when I changed them. Bit of a difference...
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Old 24 May 2012, 09:12   #22
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I imagine it's because all the energy it's transferred straight to the tyres and none is taken up in the spring
Don't understand...a spring is a spring
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Old 24 May 2012, 10:22   #23
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Don't understand...a spring is a spring
Not if it's active or an air spring etc.
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Old 24 May 2012, 11:12   #24
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Not if it's active or an air spring etc.
A spring not a spring if it's "active" or "air"?. I think you're confusung the "spring" with the ride levelling function and the integral bur functionally seperate damper
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Old 24 May 2012, 12:21   #25
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A spring not a spring if it's "active" or "air"?. I think you're confusung the "spring" with the ride levelling function and the integral bur functionally seperate damper
Not all cars have springs, some have air bags, some also have a self levelling function, like Active cornering, which means the body of the car doesn't roll as much, so all that energy is transferred through the system straight to the tyres, so they wear quicker.
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Old 24 May 2012, 13:02   #26
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Not all cars have springs, some have air bags, some also have a self levelling function
Like I said, you're confusing springs, levelling and damping.

A 'spring' doesn't have to be made of steel coils: those are just one type of 'spring'...a spring can be an oil 'spring' - like in a hydraulic Citroen, a rubber 'spring' as in early non-BMW Mini's, or an air 'spring' such as in LR's, Jaguar's, MB's and trucks.

In all air sprung cars, the air provides the springing and directly replaces the steel coil springs of other cars. The air also - but separately - provides a hydraulic mechanism for the levelling function you talk of. This allows the level of a vehicle to be controlled - via an ECU - whether cornering, or under sharp braking or when heavily loaded. This keeps the contact patch of the tyre consistent with the road regardless of speed, braking or load. This managing of the tyre contact patch, through the air springing and levelling medium, is, in fact, an aid to reduced tyre wear not a mechanism that accelerates it.

If you're comparing, say, Disco 3/4 with a Defender for tyre wear, then factors like vehicle weight, vehicle performance potential, vehicle usage profile - whether it's the type of vehicle likely to be driven quicker or slower - tyre aspect ratio, tyre rubber mix, tyre design brief etc etc would be more significant than whether it was on air springs or not
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Old 24 May 2012, 13:26   #27
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Fair enough, I agree with alot of what you said, others bits I don't.

Your missing my point though about the energy transfer through the car, if a car rolls, some energy is going into making the car roll, if it's level, the energy goes straight through the suspension into the tyres.

Obviously it's nicer to drive through the corners, but that's not what we are talking about. It's about tyre wear.
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Old 24 May 2012, 14:06   #28
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Fair enough, I agree with alot of what you said, others bits I don't.

Your missing my point though about the energy transfer through the car, if a car rolls, some energy is going into making the car roll, if it's level, the energy goes straight through the suspension into the tyres.

Obviously it's nicer to drive through the corners, but that's not what we are talking about. It's about tyre wear.
It's about action and reaction and weight transfer and the effects on tyre geometry and thus tyre wear...but, OK, I officially give up
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Old 24 May 2012, 14:15   #29
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It's about action and reaction and weight transfer and the effects on tyre geometry and thus tyre wear...but, OK, I officially give up
I give up as well. Let's call it quits...
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Old 24 May 2012, 14:27   #30
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Fank fuk for dat

Too growen nobburs argyewin bowl sprinngs Woz starting too gett tyresum an woz creaytin a bitt ov tenshun
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