BigJimnyMeet (North) 2024 (12 Jan 2024)
14th July 2024
Parkwood Nr. Leeds
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Gen4 shocks replaced
Maybe Lambert can give us some science as to why the Gen4 is so uncomfortable and difficult to tame?
I have a theory, look at the ratio of un-sprung weight to sprung body mass. There is just not enough mass in the vehicle to absorb all that kinetic energy! Unless we use a fluid or air to soak it up, it will always bounce and/or be uncomfortable. I look back at Citroen and the Hydro-pneumatic suspension, Mini and the hydrolastic suspension, even some Range Rovers have air suspension, and I see a better solution.
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Grima wrote: Thanks Soeley, renewing in Nov. LV here i come.
Any idea on fitting a 30mm chain gun & hell fire missiles?
I have been recommended BRENTACRE by someone I know, they allow any modification at all as long as it doesn't increase BHP apparently without raising the premium. I will get a quote off them when mine is due for renewal. They might be dearer for a standard car, but might work out cheaper if your insurance charges for each mod.
LV didn't even charge an admin fee each time I rang them.
Black 2019 Jimny SZ5
www.bigjimny.com/index.php/forum/8-my-ji...ley-s-2019-black-sz5
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GeorgeC wrote: Which shockies to fit? Lots of suggestions but they all seem to be longer and lift orientated.
Maybe Lambert can give us some science as to why the Gen4 is so uncomfortable and difficult to tame?
I have a theory, look at the ratio of un-sprung weight to sprung body mass. There is just not enough mass in the vehicle to absorb all that kinetic energy! Unless we use a fluid or air to soak it up, it will always bounce and/or be uncomfortable. I look back at Citroen and the Hydro-pneumatic suspension, Mini and the hydrolastic suspension, even some Range Rovers have air suspension, and I see a better solution.
I am extremely happy with my trailmaster sport dampers. For my exact use they are only ever going to be beaten by an adjustable damper. They offer a nice range of firm damping when the car is loaded with work supplies or when I have a trailer on the back, the pitch control is especially good. Yet in the solo and empty state the same dampers with road springs are perfectly smooth on all but the most severe irregularities and yet they don't make it feel unstable in corners. Get to the circuit and swap the road springs to the track ones and the same dampers now allow for almost flat cornering at silly speed much to the general amazement of my track day friends.
It's also worth remembering that the dampers work in conjunction with the springs. While the effects of a stiffer damper will noticeable its not going to be as much of a change as alterations to the spring rate as its the springs that actually absorb the energy and the dampers control how that energy is dissipated in both compression and rebound. It is also worth mentioning that a good road damper is not necessarily a good one for off road. Tuning suspension is a very precise art and there's no one size fits all solution, it's why so much development is being done on adaptive systems that react in real time to the exact conditions.
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!
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GeorgeC wrote: Which shockies to fit? Lots of suggestions but they all seem to be longer and lift orientated.
Maybe Lambert can give us some science as to why the Gen4 is so uncomfortable and difficult to tame?
I have a theory, look at the ratio of un-sprung weight to sprung body mass. There is just not enough mass in the vehicle to absorb all that kinetic energy! Unless we use a fluid or air to soak it up, it will always bounce and/or be uncomfortable. I look back at Citroen and the Hydro-pneumatic suspension, Mini and the hydrolastic suspension, even some Range Rovers have air suspension, and I see a better solution.
Correct. The high unsprung mass (around 20%) due to big tyres and live axles is the root cause of many of the Jimny's handling quirks, and there is no perfect solution. This is why the Jimny is so sensitive to tyre pressures. Even with the best dampers in the world, a Jimny will never be able to handle speed bumps like a Citroen, simply because so much of the car's mass is displaced by each impact.
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