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BigJimnyMeet (North) 2024 (12 Jan 2024)


BigJimnyMeet 2024

14th July 2024
Parkwood Nr. Leeds

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Comfort in Suspension lift question

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16 May 2020 09:44 #222315 by DAGZOOK

B3Hulk wrote:
Also, I do have a question about cross members being relocated. I relocated mine with the kit provided but I am not really sure on the reason. Can anyone give me a little insight?


Hulk, the front cross member drop kit is supplied because the front prop shaft clashes with the crossmember when the front axle is at full droop.

Supposedly, it's only required when you lift the vehicle more than 40mm... you may have gotten away without it for your install but some comprehensive kits seem to come with it (black raptor & tough dog). It's just a series of brackets to drop it right? rather than a new crossmember.

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16 May 2020 10:28 #222318 by B3Hulk
Replied by B3Hulk on topic Comfort in Suspension lift question

DAGZOOK wrote:

B3Hulk wrote:
Also, I do have a question about cross members being relocated. I relocated mine with the kit provided but I am not really sure on the reason. Can anyone give me a little insight?


Hulk, the front cross member drop kit is supplied because the front prop shaft clashes with the crossmember when the front axle is at full droop.

Supposedly, it's only required when you lift the vehicle more than 40mm... you may have gotten away without it for your install but some comprehensive kits seem to come with it (black raptor & tough dog). It's just a series of brackets to drop it right? rather than a new crossmember.


Yea it was just a set of brackets , spacers and new bolts n nuts.

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17 May 2020 11:15 #222392 by Busta

B3Hulk wrote:
Lambert - Lifting the car did increase the centre of gravity but the 40mm lift kit is very minimal. What helped with stability was the wider wheels that are 15" by 7" wide with a negative 13 offset which are a lot wider than the stock. I am sure if I still had the stock tyres with the stock offset, I am sure it would feel not as firm. The wider wheels and better shocks all helped with handling.


How does that work on a vehicle with live axles? The axle is ALWAYS parallel to the road surface. The body is mounted on the axles with springs, How would having a wider axle reduce the amount the body leans on the springs?
Same goes with claims that shocks can reduce body roll. They would have to be very stiff to damp such slow movement.
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17 May 2020 13:16 #222402 by Lambert
With a beam axle you have two options to reduce vehicle body roll. First is using the strength of the springs be they the road coils or the anti roll bar to overcome the bodies tendencies to lean but that will make the ride very hard. Or you can retain some ride comfort with softer springs placed further apart relative to the centre line of the vehicle. Hence the spring perches are spaced further apart on the back axle to improve stability instead of matching the front dimension.

When people say that they have a feeling of more stability with wider tyres what is actually being felt is the additional unsprung weight associated with the wider wheels and larger tyres. I have driven several other Jimny with big tyres and back to back with Dreadnaught on standard alloy wheels and tyre size and the difference is so pronounced and personally I don't like the feeling of the additional weight as it detracts from the delicacy of the steering.

Temeraire (2018 quasar grey automatic)
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17 May 2020 17:33 #222430 by Busta
I think more noticeable than the increase in weight is the increased scrub radius. The contact patch is moved outwards relative to the steering axis, so this will put more load on the steering and have a noticeable affect on how it feels. Is this better for stability? Not really, it just means the steering is a slightly heavier. But it does feel different, and many people automatically associate different with better.

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17 May 2020 17:46 #222432 by Lambert
I agree though often the increase in height can if matched carefully with offset, eliminate or at least mitigate the alteration in scrub radius. This is what happens when modification is applied without consideration of the consequences.

Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
ADOS Attention Deficit Ooooh Shiny!

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17 May 2020 17:54 #222434 by Busta
Yes that is the case if fitting taller tyres. It's not affected by the height of anything else though.

My problem is that when I consider the consequences of modification, I then don't bother making the modifications. It's almost as if Suzuki already thought things through! I read far too many claims that go completely against my basic understanding of physics. What I do know is shiny stuff that people have spent their own money on always get positive reviews.

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17 May 2020 18:08 #222436 by Grima
Replied by Grima on topic Comfort in Suspension lift question
Do Insurance "high street" companies cover suspension lifts? or do you need specialist insurance company.

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17 May 2020 19:02 #222443 by Soeley
I am with LV, the other week a phoned them and asked them about fitting a 40mm lift to the suspension. My renewal is due at the end of September and they said there would be no increase in premium.
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17 May 2020 19:09 #222444 by Grima
Replied by Grima on topic Comfort in Suspension lift question
Thanks Jack, A "bulldog" company costs me £234 for a new 69 Gen4 with BFG Ko2 tyres. Just wondering is it worth the cost of a lift kit / fitting & insurance jump, just for better looks? Arrrrr Yesss.

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17 May 2020 19:11 #222445 by sniper

Lambert wrote: With a beam axle you have two options to reduce vehicle body roll. First is using the strength of the springs be they the road coils or the anti roll bar to overcome the bodies tendencies to lean but that will make the ride very hard. Or you can retain some ride comfort with softer springs placed further apart relative to the centre line of the vehicle. Hence the spring perches are spaced further apart on the back axle to improve stability instead of matching the front dimension.

When people say that they have a feeling of more stability with wider tyres what is actually being felt is the additional unsprung weight associated with the wider wheels and larger tyres. I have driven several other Jimny with big tyres and back to back with Dreadnaught on standard alloy wheels and tyre size and the difference is so pronounced and personally I don't like the feeling of the additional weight as it detracts from the delicacy of the steering.


Very much agree, I would actively source tyres that performed well and were lighter.... Unsprung weight is a big negative. Your car is quicker off the mark than mine, noticeably so. Mine picks that up quite quickly but you would get 10ft on a standing start easily, at second gear...

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