3/4 or 1/4 eliptic in the rear

[nicbeer]

Ok, I have searched.

What is involoved in doing a 3/4 or 1/4 eliptic in the rear of a SWB sierra? If possible using std zook springs. All SPUA. doing RUF front. What is the difference between the two. I have seen grimbos zook rear but only flex pics.

I have seen some tech somewhere but don't know where I found it.

Any disadvantages of this mod...


cheers

[DeWsE]

how well did you search?

Anyway this is a great thread, one of the better ones from this forum

http://www.outerlimits4x4.com/PHP_Modul ... +4+eliptic

[redzook]

1/4 eleptic sua

i think u better do 3/4 cos 1/4 involves links

the overkill buggy (aztec) runs 1/4 eleptic in the rear

[grimbo]

3/4 works well on a narrow track as the spring hangers are directly under the frame so ou have a nice level surface for the spring to sit. With a WT you have te problem of the spring perches being offset from the frame. SPUA and 3/4 is a good combination as it gives a nice controlled flex without any strange habits. If you go SPOA and 3/4 then you will find that you will have a very flexy but hard to control set of springs.

Similarily a 1/4 can give the same adverse flex if not done correctly. Alot of the old school desert race trucks used 1/4 to great effect bt you need to have well tought out and setup links to make them usable. If done incorrectly you end up wih something with oodles of uncontrolled rear flex that will tend to flex and flex and flex then fall over

[nicbeer]

Cool, I did a search on 3/4 and it did not pick that up,

Got me thinking now.

Any disadvatages of running a 3/4? thinking it will be pinned onroad.

any tech web links that people are hoarding would be super as well.

cheers

[DeWsE]

I forgot what thread it was in but grimbo posted some pics of his. easy to do just half spring connected to chassis with two U bolts. Then use another U bolt to pin back if required on road. check out the photo's on the SR20 LWB zook and you will see what I mean.

1/4 = to hard

[grimbo]

Cool, I did a search on 3/4 and it did not pick that up,

Got me thinking now.

Any disadvatages of running a 3/4? thinking it will be pinned onroad.

any tech web links that people are hoarding would be super as well.

cheers

I haven't experienced any negative handling or spring war issues. I have also never had the ubolts loosen in the 6-7 years I've been running this setup. They are also engineereable with a locking mechanism for on road.

[moose]

Cool, I did a search on 3/4 and it did not pick that up,

Got me thinking now.

Any disadvatages of running a 3/4? thinking it will be pinned onroad.

any tech web links that people are hoarding would be super as well.

cheers

I haven't experienced any negative handling or spring war issues. I have also never had the ubolts loosen in the 6-7 years ( LAST 3 IN THE GARAGE !!) I've been running this setup. They are also engineereable with a locking mechanism for on road.

[moose]

will have to modify fuel filler neck !!!
as it goes between chassis & spring !!! (stoopid designers !!)

if you have a body lift , get filler neck on tank , repositioned to the top of the tank !
then , runner filler between body & chassis !!!

[Patchy]

ok im going to ask the question at risk of sounding like an idiot. what do you mean by eleptic spring set ups

[suzi_on_46s]

so who is going to run any fo these for on and off road use

[RB zook]

ok im going to ask the question at risk of sounding like an idiot. what do you mean by eleptic spring set ups

a normal spring is 1/2 of an elipse

so 3/4 eliptic is a normal spring pluss half a spring = so 3/4 of an elipse

and 1/4 eliptic has half a spring but upside down + so its 1/4 of an elipse shape

[Patchy]

ah k thanx thats simple

[roc box]

3/4 works well on a narrow track as the spring hangers are directly under the frame so ou have a nice level surface for the spring to sit. With a WT you have te problem of the spring perches being offset from the frame. SPUA and 3/4 is a good combination as it gives a nice controlled flex without any strange habits. If you go SPOA and 3/4 then you will find that you will have a very flexy but hard to control set of springs.

Similarily a 1/4 can give the same adverse flex if not done correctly. Alot of the old school desert race trucks used 1/4 to great effect bt you need to have well tought out and setup links to make them usable. If done incorrectly you end up wih something with oodles of uncontrolled rear flex that will tend to flex and flex and flex then fall over

i have 3/4 and spoa doesnt exhibit any strange habits the flex is good and its not unstable at all not even on off camber climbs im very happy with it

[MY45]

Hey nicbeer, have a serious search on pirate as the have been though a major 3/4 elliptic stage in the last few years. They have some really good posts with great pics as well.

I dont give a crap about whingers saying not to say pirate, but thats where i found the best info for my 3/4 conversion.

Shoot me a pm if you want pics of my 3/4 setup.

[suzi_on_46s]

to right m8

[Red_Zook]

im intrested in 3/4 rear of a wt zook, has any one done it? i would be intrested in some pics eh?
Phil