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jimny front radius arms
http://auszookers.com/forum/viewtopic.php?f=5&t=45968
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Author:  Rustyray13 [ Wed Apr 23, 2014 8:58 am ]
Post subject:  jimny front radius arms

Ive been searching around for a decent priced set of dropped radius arms to suit a 3-4 in lift as my front springs are bent even with front castor bushes fitted so my question is is there any local shops making them other than snake racing i can see ora ones in uk does anyone know how much to get them here do they work out more than snake in the end cheers

Author:  Jezza86 [ Wed Apr 23, 2014 9:57 am ]
Post subject:  Re: jimny front radius arms

jimny bits ones work well, Shep has the ora things, but i dont think he was happy with the finish. they may have fixed that now

jb ones 433.92 to australis w/o bushes

Author:  Jim_Aus [ Wed Apr 23, 2014 12:42 pm ]
Post subject:  Re: jimny front radius arms

i got a quate for some from Thailand

JIMNY
Trailing Arms 1set
(4pcs) AU$799
Shipping Cost : AU$ 206 By EMS
Total : AU$ 1005
※ Shipping cost is included.
※ Validity: 2014.4.30
the fronts are a two piece arm though..... they look arlight

Author:  jimny_timmy [ Wed Apr 23, 2014 8:14 pm ]
Post subject:  Re: jimny front radius arms

Got a link to these?^^^^


Sent from my iPhone using Tapatalk

Author:  shep [ Wed Apr 23, 2014 8:25 pm ]
Post subject:  Re: jimny front radius arms

The ORA ones I have at the moment are pure shit. Crap welding, shit finish and the rears are too short. I have been winging
To ORA about them and they are sending me another set of their new design arms. Hopefully I will have them fitted in the next couple of weeks.

Author:  Jim_Aus [ Wed Apr 23, 2014 8:29 pm ]
Post subject:  Re: jimny front radius arms

I saw that on the Big jimny forum.... No good. I'll post the company tomorrow ;)

Author:  zukenutter [ Wed Apr 23, 2014 9:19 pm ]
Post subject:  Re: jimny front radius arms

Those new ORA arms look pretty good. I have ORA arms at the front and have been happy with them except for their poor ground clearance.

Timmy, these may be the ones Jim_Aus was quoted.
http://www.giz.com.tw/english/product_detail.php?pid=1&ppid=1&Id=16

Author:  Jim_Aus [ Wed Apr 23, 2014 11:48 pm ]
Post subject:  Re: jimny front radius arms

Yup that's the ones... Look alright to me. Still gotta get bushes for them.. Bit of a pain

Author:  greenzook89 [ Thu Apr 24, 2014 11:47 am ]
Post subject:  Re: jimny front radius arms

Call me paranoid but I dont like the idea of a two piece arm... but it would be cool if the small link was threaded to adjust castor.

Author:  jimny_timmy [ Thu Apr 24, 2014 11:51 am ]
Post subject:  Re: jimny front radius arms

I'd imagine 2 piece arms might be good off-road... That much play on road couldn't be a good thing?

Author:  zukenutter [ Thu Apr 24, 2014 12:23 pm ]
Post subject:  Re: jimny front radius arms

Their two piece arm is for the rear. The front is one piece.

Image

Author:  Jim_Aus [ Thu Apr 24, 2014 3:10 pm ]
Post subject:  Re: jimny front radius arms

yea thats what i was thinking....... im saving for a set now though.... (long process on my wages hahahahaha)

Author:  BertZook [ Thu Apr 24, 2014 10:06 pm ]
Post subject:  Re: jimny front radius arms

wondering how much gain in flex those arms would give

Author:  Jezza86 [ Thu Apr 24, 2014 11:42 pm ]
Post subject:  Re: jimny front radius arms

BertZook wrote:
wondering how much gain in flex those arms would give

probably enough to reduce the rear roll stiffness to a point that you'd put the stock arms in

Author:  zukenutter [ Fri Apr 25, 2014 6:29 am ]
Post subject:  Re: jimny front radius arms

They'd only help until the shocks ran out of travel. I think the main advantage would be the reduction of strain on the bushes

Author:  31zook [ Fri Apr 25, 2014 10:42 am ]
Post subject:  Re: jimny front radius arms

Is it a bolt and spacer in the rear arms? Or bushes? Would be interesting to see In person...

Author:  BertZook [ Fri Apr 25, 2014 11:40 am ]
Post subject:  Re: jimny front radius arms

zukenutter wrote:
They'd only help until the shocks ran out of travel. I think the main advantage would be the reduction of strain on the bushes


longer shocks then ;)

I picture then as keeping the axle at the same parallel to the car while traveling up and down, so no roll or twist.

apart from keeping the coils and the shocks straight, donna what would be the main benefit form them, more travel or flex, what else?

only get to find those product photos, can't find any of the arms in action

Author:  dougies_tx5turbo [ Fri Apr 25, 2014 11:52 am ]
Post subject:  Re: jimny front radius arms

well ive got a pair of these with my suspension kit waiting to be put in. i just need to get them sprayed black.
there was another similar thread to this a year or so ago with alot more information and some similar front arms.

Image

Image

Author:  shep [ Fri Apr 25, 2014 1:24 pm ]
Post subject:  Re: jimny front radius arms

They don't look very strong, I reckon where the bend is will fail reasonably easy.

Author:  31zook [ Fri Apr 25, 2014 3:07 pm ]
Post subject:  Re: jimny front radius arms

They look strong enough. I just wonder how well the would control axle tramp. Considering slightly worn bushes would make it click/hit on the lower arm...

Author:  pezz [ Fri Apr 25, 2014 4:02 pm ]
Post subject:  Re: jimny front radius arms

Rubicon express use this design on long arms for thr front of tj and xj jeeps, seams to work in that application, not the best option, but for a bolt in long arm with the packaging issues the jeeps have in the front they get the job done

Author:  Gwagensteve [ Fri Apr 25, 2014 4:33 pm ]
Post subject:  Re: jimny front radius arms

zukenutter wrote:
They'd only help until the shocks ran out of travel. I think the main advantage would be the reduction of strain on the bushes


I'm not being a hater - please don't take offence ZN, but this isn't really correct. Roll stiffness is a completely different issue to outright wheel travel.

Here's an example - I see you unhook your front sway bar when off road. With the sway bar attached, I'm sure you have exactly the same amount of [img]vertical[/img]wheel travel as with it disconnected, but the car feels and flexes completely differently with the bar on and off - that's because the roll stiffness is affected by the sway bar, even though nothing else is.

Fitting those two piece rear radius arms would, as far as I can tell, significantly reduce the rear roll stiffness. I don't really know enough about jimny suspension behaviour to comment as to whether that's positive or not* (see below), but I can assure you they would have a noticeable effect on the cars handling, regardless of the shock travel.

*(This is just my opinion) My guess is that there's nothing wrong with the roll stiffness of the rear of a Jimny and you wouldn't want to lower it. They seem to have no problem flexing as far as any shocks that can be made to fit can allow. However, there must have been some point to designing these rear arms, and it might have to do with urethane bushes. Running urethane not only increases roll stiffness (to the point it can start to hurt travel, but it also looks to heavily load up the inadequate axle brackets. Fitting these arms with urethane bushes might/should/could reduce bushing bind and help the brackets live when using urethane bushes. Personally, I don't understand the use of urethane bushes in a radius arm suspension, but there you go. It wouldn't be the first time a product didn't make sense.

Author:  31zook [ Fri Apr 25, 2014 5:38 pm ]
Post subject:  Re: jimny front radius arms

Jimnys standard rear roll stiffness is fairly good in my books. Doesn't unload, doesn't try to walk under itself on a hill, and I have never seen a jimny that does.

With that said, if you could incrementally lower it and see where if feels best but it would suprise me if its much lower then where it is now.

If people want wheel travel from their Jimnys they need to work on the front.

Author:  Gwagensteve [ Fri Apr 25, 2014 5:44 pm ]
Post subject:  Re: jimny front radius arms

^ Much truth here.

It's always easier to make the back end work than the front, but the most gains are always had when the front end works hard. We rarely reverse up obstacles, and backing up obstacles to make it look like the front suspension can flex is strictly for patrol owners.....
Oh scrap that, that doesn't seem to work either :D

Image

Check the hektik front flex!

Author:  Rustyray13 [ Fri Apr 25, 2014 10:16 pm ]
Post subject:  Re: jimny front radius arms

Well cheers for the info guys aus jim thanks for your efforts on pricing fom thailand. they look ok anyone successfully passed an engineers cert with that type. has anyone got pics of old ora frony arms and their updated style and rough prices to aus cheers.

Author:  Rustyray13 [ Fri Apr 25, 2014 10:18 pm ]
Post subject:  Re: jimny front radius arms

Oh sorry to jezza86 just saw your.post there of jb ones ill
check those out cheers

Author:  zukenutter [ Mon Apr 28, 2014 7:45 am ]
Post subject:  Re: jimny front radius arms

Gwagensteve wrote:
zukenutter wrote:
They'd only help until the shocks ran out of travel. I think the main advantage would be the reduction of strain on the bushes


I'm not being a hater - please don't take offence ZN, but this isn't really correct. Roll stiffness is a completely different issue to outright wheel travel.

Here's an example - I see you unhook your front sway bar when off road. With the sway bar attached, I'm sure you have exactly the same amount of [img]vertical[/img]wheel travel as with it disconnected, but the car feels and flexes completely differently with the bar on and off - that's because the roll stiffness is affected by the sway bar, even though nothing else is.

Fitting those two piece rear radius arms would, as far as I can tell, significantly reduce the rear roll stiffness. I don't really know enough about jimny suspension behaviour to comment as to whether that's positive or not* (see below), but I can assure you they would have a noticeable effect on the cars handling, regardless of the shock travel.

*(This is just my opinion) My guess is that there's nothing wrong with the roll stiffness of the rear of a Jimny and you wouldn't want to lower it. They seem to have no problem flexing as far as any shocks that can be made to fit can allow. However, there must have been some point to designing these rear arms, and it might have to do with urethane bushes. Running urethane not only increases roll stiffness (to the point it can start to hurt travel, but it also looks to heavily load up the inadequate axle brackets. Fitting these arms with urethane bushes might/should/could reduce bushing bind and help the brackets live when using urethane bushes. Personally, I don't understand the use of urethane bushes in a radius arm suspension, but there you go. It wouldn't be the first time a product didn't make sense.



No offence taken Steve, and I agree. I was actually meaning that the Jimny rear already works, stiffness is not an issue in the rear at all. I've actually been considering a rear sway bar due to my long hauls and towing duties (keep in mind my Jimny sees multiple dd duties). The only limit to travel is bump stops and shock extension and compression lengths.


31zook wrote:
Jimnys standard rear roll stiffness is fairly good in my books. Doesn't unload, doesn't try to walk under itself on a hill, and I have never seen a jimny that does.

With that said, if you could incrementally lower it and see where if feels best but it would suprise me if its much lower then where it is now.

If people want wheel travel from their Jimnys they need to work on the front.



Agree with all of this

Author:  Jezza86 [ Mon Apr 28, 2014 9:13 am ]
Post subject:  Re: jimny front radius arms

zukenutter wrote:
I've actually been considering a rear sway bar due to my long hauls and towing duties (keep in mind my Jimny sees multiple dd duties). The only limit to travel is bump stops and shock extension and compression lengths.


this is what i was contemplating here viewtopic.php?f=37&t=45261&p=808109&hilit=+roll#p808109
i figgured the risk was going 3 wheeler style round corners the way a evo will on a track, however being rear wheel drive thats less likely, but also not ideal.

Author:  Gwagensteve [ Mon Apr 28, 2014 9:29 am ]
Post subject:  Re: jimny front radius arms

Mike57 and I were going over this at the Club's tech day yesterday.

I think there is some merit in increasing roll stiffness in the rear of a Jimny, especially when the car is heavily loaded. I think Mike's car is typical of many Jimnies equipped for camping and runs at GVM (or over) pretty much all the time. In this case, I think that the rear bushing stiffness is inadequate for a car right on or over GVM, and that's where the looseness and sway is coming from. Swapping to stiffer bushes isn't a good option as it leads to bracket failure, and increasing shock and spring rates is a poor solution as the rear shocks and springs are inboard too far - in order to arrest sway the ride on vertical travel (i.e corrugations) will become excessively harsh.

Most other 4WD's run a rear sway bar, It might well be the answer for the Jimny.

Steve.

Author:  zukenutter [ Mon Apr 28, 2014 12:15 pm ]
Post subject:  Re: jimny front radius arms

Yes to all of that

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