04-30-2024, 09:51 AM | #67 | |
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04-30-2024, 10:02 AM | #68 | |
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The pressure/volume relationship of a gas in an adiabatic process is: P2/P1 = (V1/V2)^n where P1 and V1 is the pressure and volume of the gas in the air spring at the static ride height, P2 and V2 the pressure and volume of the air spring deflected. n is the adiabatic gas constant which for air is 1.4. Adiabatic is applicable here because the duration of the process, suspension deflection, is short enough to provide for minimal heat transfer of the gas to its surroundings. Using this relationship with dimensions found for the X5's suspension and gas struts, the pressure ratio from the static condition at the normal ride height for various suspension deflections in compression is: Compression Deflection - mm Pressure deflected/pressure static 10.....................................1.08 20.....................................1.16 30.....................................1.26 The same calculation starting from the sport level ride height, 20 mm lower than the normal level ride height, is: Compression Deflection - mm Pressure deflected/pressure static 10.....................................1.26 20.....................................1.37 30.....................................1.50 Two things to observe here; 1) The greater pressure rise for the same suspension compression, therefore, a high spring rate, and, 2) The pressure ratio increases with the degree of compression resulting in a corresponding increasing force, or a variable spring rate. To further clarify this last point, an increasing force with increasing deflection is not spring rate, spring rate being define as the change in force per unit deflection. So for the above examples, a deflection from 20mm to 30mm produces a greater pressure (force) increase than the change in deflection from 10mm to 20mm - a variable spring rate. By comparison, the common coil spring of constant wire diameter, coil diameter and coil angle and pitch produces a force proportional to deflection; i.e. compress the spring 10% and the force increases 10%, compress the spring 20% and the force increases 20%, that is, a constant change in force per unit deflection - a constant spring rate. |
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04-30-2024, 10:25 AM | #69 | |
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Selecting "Sport" suspension on my 45e makes a big difference. I wouldn't want more stiff. It think is just right in terms of stiffness and harshness |
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04-30-2024, 10:38 AM | #70 |
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Drives: 2024 X5 M60i | 2024 M440i GC
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I have the m60i with air suspensions, paired with 20” wheels for max comfort.
No regets whatsoever.
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04-30-2024, 10:39 AM | #71 | |
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now read MotoWPK post above about the physics involved, though I don’t expect you to understand it one bit. you’ve yet to prove your “understanding” with anything but non-applicable articles and “it just doesn’t work that way.” may the good lord help you |
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04-30-2024, 11:22 AM | #72 | |
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Thanks for doing the calculations. Let's hope some persons can understand the concept that air inside a container needs more force to be compressed from 2 to 3 bars than from 1 to 2. Last edited by JoeAyalaM; 04-30-2024 at 11:41 AM.. |
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04-30-2024, 11:43 AM | #73 |
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Good, I believe you won't be dissapointed, may be some buyer's remorse can set it, but that'll be it.
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04-30-2024, 11:50 AM | #74 | |
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Can somebody imagine how much more comfy the X5 could be with the Air Suspension? |
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04-30-2024, 12:05 PM | #75 |
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Drives: '24 X5 M60i
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04-30-2024, 12:27 PM | #76 |
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Not sure i care much about all this science behind it but I come from 4 years of an X5 M50d with Sport seats and msport suspensions and 22” wheels. Hardly used the suspensions in their sport setting as they are far too hard especially in combo with the sport seats. After 500Km trips you really start feeling quite uncomfortable so it’s mainly custom sport mode with suspensions in their comfort setting. This time round I opted for the X5 M60i with Comfort seats and Air suspensions. Most of the time i want an Suv to be comfortable. Very few times do I need it to be a bit more sporty and that usually happens when on the Gerrman autobahn. I’m pretty sure the air suspensions in their lowered sport mode will be fine, if not better than the standard msport ones, even when travelling at 190km/h-200km/h.
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04-30-2024, 12:51 PM | #77 |
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I have the 50e and I set my individual preferences to sport mode. Agree with other posters here that its a nice ride, firm enough but not floaty as normal setting. I can't stand the normal setting. I have other SUVs with air suspension and the X5 is just superior with the ride dynamics.
When I really want a sporty ride, I take my wagon with ohlins |
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04-30-2024, 02:19 PM | #78 | ||
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Steel suspensions start 'failing' as soon as you leave the dealership. Quote:
I'm literally 'money ahead' to drive cars with air suspensions at this point because they're a 'potential' replacement instead of a 'scheduled' replacement item.
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05-01-2024, 01:52 PM | #79 | |
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How do I feel float that doesn’t exist… Your point?
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05-01-2024, 01:55 PM | #80 | |
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05-01-2024, 02:20 PM | #81 |
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I haven't read through the entire thread but responding the OPs questions - I have air suspension and wouldn't have the X5 without it. For an SUV/SAV, the X5 with air suspension is stiff enough, especially when in (lower) sports mode without sacrificing luxury.
If I wanted any more sportiness I would have opted for an M Sedan. With the air suspension, I can have my cake and eat it too Unless you plan to track your X5 - you should consider air suspension. Last edited by starlights; 05-01-2024 at 02:25 PM.. |
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05-01-2024, 06:09 PM | #82 |
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In forums like this -- and particularly car forums -- ignore can be your best friend and make your time here more enjoyable. I quickly put him on ignore and it has made all the difference.
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05-01-2024, 06:39 PM | #83 |
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Just ignore him. He was just lashing out and trying to make fun/be sarcastic in regards to the air suspension. He likely was a little embarrassed by his total misunderstanding of how the system works and trying, unsuccessfully, to save some face. I'm certain he was not saying anything against you or seriously questioning anything you said.
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05-01-2024, 10:57 PM | #84 | |
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05-01-2024, 11:04 PM | #85 | |
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05-02-2024, 10:19 AM | #87 |
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