Axle wrap bar and anti squat ???s

[FLYINGLOW]

If the axle wrap bar is pointed higher or lower will it effect anti squat? I am basing my design on Woody's write up in tech, but can the shackle point up from the cross member instead of down without any changes in handling? I ask this because on a 4 link, if the links point higher, then the anti squat increases. Should I worry about it?

BTW, I did a search, it came up with LOTS of hits, without much info.

 

[woody]

the wrap bar will effect antisquat values, and while it controls wrap well, can increase the chance of wheelhop.

I would expect increased ill-effects by placing the shackle above the crossmember, but honestly, I'm not sure why I believe that...

mmmm.....2nd guessing this, many wrap bar designs follow the angle my design did, but tie into a lower crossbar under/at the frame, like the topside of the skid plate. Lowering that leverage point would, IMO, be a good idea....

anyone else? talking outta my butt here....lol

 

[TxCruzr]

I would think that the more parallel the wrap bar is to the ground, the less effect on wheel hop it would have. So the higher the shackel mount is the more wheel hop

 

[Radd Cruisers]

Sounds like a mad rush to get ready for the Moab, wish I were going.

Oh and about the wrap bar, I put the shackle below on Toms HZJ 60 although not yet test driven?


You got the engine done now get that wrap bar in and come get me, I will show you the trails up on Dumont that the BC 4X4 association ran a couple weeks ago.

 

[FLYINGLOW]

OK, thanks guys. I think I will mount it below the cross member.

And ya Radd, it is a mad rush for Moab. I go to work tommorow for a week but hopefully I will get the 3rd back in today. I just finished fighting with that damn copper air line for the ARB. I have the bracket welded to the axle housing for the bar as well. All this working on diffs is a good practice for Moab, but hopefully I won't need it once I get a traction bar installed.

 

[Mace]

Mind you, it is easy to bash rocks if it is below the xmember.


But it will not effect AS values as much.

 

[woody]

one plus to below the cross member, or (like mine) having the pivot centered on the backside of the crossmember, is the bottom edge of the V design will be an additional slide point along with the driveshaft, and perhaps help save that a bit...

 

[Radd Cruisers]

one plus to below the cross member, or (like mine) having the pivot centered on the backside of the crossmember, is the bottom edge of the V design will be an additional slide point along with the driveshaft, and perhaps help save that a bit...

Never thought of it that way.

Still cannot figure out how the wrap bar would increase wheel hop, I thought wheel hop on leafs was the issue of the spring flexing under power?

You have first hand expierence though, so I guess we must trust the master.

 

[woody]

basically, instead of rotating the axle and causing wrap, the wrap bar makes upwards leverage on the crossmember, creating different antisquat characteristics than a normal non-bar suspension.

IMO, wheel hop on a leaf spring rig is more the result of the released force from the wrap of the springs, not the compression of the springs.

Either way, quality gas charged shocks mounted as vertically as possible can help mitigate the issue, particularly if they have a high rebound value (my Bilsteins are IIRC 70 compression and 255 rebound, or something like that) I was never a believer until I switchef rom DT3000's angled inwards to the 5150's mounted near-verticle....significant difference in my 4-link.

 

[FLYINGLOW]

Mind you, it is easy to bash rocks if it is below the xmember.
But it will not effect AS values as much.

Thats what I'm looking for. I believe a more neutral AS value will be best.

 

[Jonathan_Ferguson]

Can a standard Hilux get Axle Wrap, with Leaf Springs that appear to be in good condition, but have about 2.5" to the Bump Stops?
Could this couse the Centre Bearing to wear out rather quickly?
Would I be able to feel Axle Wrap, when I immediately step on the Clutch after Reversing? - Or could this be an indication the Centre Bearing is about to break?

I had the Centre Bearing Rubber break up, whilst on the Highway doin' 'bout 120km/h on my way to a day of Wheelin'. Still got to go Wheeling, but I rode in Dad's FZJ80.

What are the Advantages/Disadvantages for the Torque Rod's that connect from each Chassis Rail to below the Axle Housing on the U-Bolt Plate?

 

[woody]

those torque rods tend to limit travel moreso than a single center mounted unit. LOTS of minitruck guys run wrap bars, usually situated on a reinforced tower above the pumpkin (centered).

A quick check at 4x4wire.com outta net you a few ideas and images, their minitruck section is pretty active.

 

[Tools R Us]

Good Runner/truck info at Yota Tech also.

http://www.yotatech.com/

 

[woody]

d'oh...forgot about that one, more active than 4x4wire too...