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Thread: Wide tyres

  1. #21
    Senior Member simpo3's Avatar
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    Interesting, thanks. I didn't realise XJs had air suspension, thought that was just some weird Citroen thing.

    So, how easy would it be to swap it over? Let me guess, not actually feasible?

  2. #22
    Senior Member payno's Avatar
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    Citroen suspension has nothing to do with air suspension it makes use of the cars hydraulics a accumulator sphere and nitrogen gas to raise and lower the car
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  3. #23
    Senior Member simpo3's Avatar
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    Yeah, I just drive 'em. In a way the best car I ever had was an 1990 XJ40 4.0 Sovereign. It made roads smooth, it was so quiet the loudest noise was the odd squeak of leather, and it did 50-70 faster than just about anything. Also had an instant mpg readout and some dials!

  4. #24
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    Quote Originally Posted by payno View Post
    Citroen suspension has nothing to do with air suspension it makes use of the cars hydraulics a accumulator sphere and nitrogen gas to raise and lower the car
    The Nitrogen is the springing medium

  5. #25
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    Quote Originally Posted by simpo3 View Post
    Interesting, thanks. I didn't realise XJs had air suspension, thought that was just some weird Citroen thing.

    So, how easy would it be to swap it over? Let me guess, not actually feasible?
    Physically, it should be very easy to fit - the chassis and suspension is pretty identical from X150 to X350. Where you'd fall down is the electronics in both communication and set-up. I don't know if the other ECUs in your car would accept the air suspension as a friend and be willing to play.

    My gut feel is that your X150 may be set up to be a touch softer than an X350 anyway

  6. #26
    Senior Member simpo3's Avatar
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    Don't need electronic bollocks, just springs and dampers that work

  7. #27
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    Quote Originally Posted by simpo3 View Post
    Don't need electronic bolloc.ks, just springs and dampers that work
    Disagree. The magic thing about the X150 and the reason I bought one (apart from the looks) is the computerised suspension and the way it instantly transforms from 'gentleman mode' to 'hooligan mode' - and back again - depending on how hard you drive it and/or switch it to 'sport' mode. I've never driven any other car like that.
    Jaguar 2007 4.2 litre XK (X150) convertible
    Maxzda 2007 MX-5 2.0 litre (non - 'Sport') roadster-coupe
    Skoda 2007 Octavia 2.0TDI 4WD (not a Scout) estate
    Reliant 1975 Scimitar GTE SE5a (off the road after 243,000 from new)

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  9. #28
    Senior Member simpo3's Avatar
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    If mine has a 'gentleman' mode I've never found it!

  10. #29
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    Quote Originally Posted by simpo3 View Post
    If mine has a 'gentleman' mode I've never found it!
    Then maybe your system's faulty? The ride (when driving gently) is beautifully smooth - at least as good as any luxury saloon I've travelled in. As I understand it, the system's default mode is rock hard, but the clever electronics can pull it into 'soft and gentle' mode when appropriate - similar to the way the flap valves on the XKR's exhaust back box are normally open ('loud') but can be pulled shut by the special vacuum pump when the electronics calls for 'quiet(er)' mode.

    No doubt people on here who are more clued-up than me can confirm whether this is correct or not.
    Jaguar 2007 4.2 litre XK (X150) convertible
    Maxzda 2007 MX-5 2.0 litre (non - 'Sport') roadster-coupe
    Skoda 2007 Octavia 2.0TDI 4WD (not a Scout) estate
    Reliant 1975 Scimitar GTE SE5a (off the road after 243,000 from new)

  11. #30
    Senior Member simpo3's Avatar
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    Apparently the car has CATS, but I don't see how 19" wheels with 35/45 profile tyres can begin to approach the ride of, say, 17" 235/60s just with electronics. Laws of physics and all that!

    Next time it goes in for a service I'll ask, but I think magic carpets are a thing of the past.

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