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BigJimnyMeet (North) 2024 (12 Jan 2024)


BigJimnyMeet 2024

14th July 2024
Parkwood Nr. Leeds

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Lift and anti roll bar

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03 Jun 2020 13:04 #223218 by sniper
Replied by sniper on topic Lift and anti roll bar

Busta wrote:

sniper wrote: The angle of fitment is very important to effective anti roll bar operation, it's a spring designed to work on a set angle, change that angle and the forces in to / out of the spring, change.

It will still work and in the majority, little or no change will be felt. But if it was a car that was driven hard on tarmac, you would see a difference in performance. It is one of many suspension geometry points that rally teams work on when setting up a car, changing length from tarmac (short) to forest (long). If it didn't matter, I'm sure they would use service time on other things...

sniper


You're talking about adjustable anti roll bars which certainly are a thing in motorsport, A series of holes in the ends of the anti roll bar allow the drop link position to be altered, effectively altering the length of the spring (the spring being the arb itself), and therefore the strength of the anti roll effect.



Notice how drastically the drop link angle changes when the strength of the anti roll bar is adjusted, yet there is no counter-adjustment made to maintain a specific drop link angle, as this is not significant.

The Jimny does not have an adjustable anti roll bar. It's a fixed length spring. Adjusting the length of the drop links or changing the position of the anti roll bar is not the same thing as adjusting the stiffness of the roll bar itself. As long as both ends are parallel with each other when the vehicle is on level ground, and it is operating in a range where the droplinks will not invert, the angle of the roll bar itself does not matter.


Lambert wrote: Not on a Jimny but my old 90 was a pig for it on the back to the point that I had enough and removed it.


The rear anti roll bars on late model Defenders were a terrible afterthought and should all be removed and destroyed.


The anti roll bars were solid on the cars I worked with, non adjustable. The only change was in the drop link length, that changed because the suspension was taller in forest spec, exactly the same as a lift..... This was done to keep the angle of operation for the roll bar the same between set ups. Lowering the ARB mounts would have the same effect as lengthening the drop links.

sniper
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03 Jun 2020 15:21 #223225 by Busta
Replied by Busta on topic Lift and anti roll bar
Then I suspect they were doing it to prevent it fouling something or to stop the drop links inverting. This is fairly common practice when lowering cars. Neither are issues on the Jimny.

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03 Jun 2020 21:39 #223239 by crash486
Replied by crash486 on topic Re:Lift and anti roll bar
Does anyone know of a disconnect made for the jb74 or something adaptable?Unfortunately it is illegal to cut and re-weld the anti-roll bar in Australia.

crash486

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04 Jun 2020 06:28 #223244 by Riccy
Replied by Riccy on topic Re:Lift and anti roll bar

crash486 wrote: Does anyone know of a disconnect made for the jb74 or something adaptable?Unfortunately it is illegal to cut and re-weld the anti-roll bar in Australia.

crash486


Just undo one end of one of the droplinks and tie it out the way, does exactly the same thing ;-)

J999 MNY, ULYSSES M18 VVT with ITB's Dyno tested at 130hp

Pickup/tipper, R7me gearbox & 6.4 Rocklobster, 31" Toyo MT, 2x ARB air locker 3.9 diffs in braced axles, 6" total lift, Floating rear conversion, Raptor painted, CB, Recaro's, Caged, etc, etc...

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