Does an antiwrap bar need vertical ties? TMR's.

[Winchested]

Building an anti wrap bar from TMR.

I went 2" 250 wall for the lower link, using 120 wall for the upper link.

Do you need vertical tie ins?

Photo stolen courtesy of TMR

 

[chaplinfj60]

it needs two points on the axle is that what you are asking?

 

[mobil1syn]

put the shackle in tension and add the green at a min

 

[chaplinfj60]

and box the back and front at least i did that on mine i had one fail. the next one did not fail.

 

[Winchested]

put the shackle in tension and add the green at a min

My shackle will be above.

I will add one vertical. Like that.

 

[chaplinfj60]

the added benefit of it being lower is it could act as a skid hitting before the drive shaft does.

 

[Winchested]

the added benefit of it being lower is it could act as a skid hitting before the drive shaft does.

I've made mine so it will be inline with the drive shaft or just under it. My driveshaft is high enough up with pinion up at 16 degrees anyhow.

 

[rockota]

only comment would add is to make the top link adjustable at the axle end. it's a huge pita to have to rebuild a track bar because something changes in the suspension...

 

[Winchested]

Meh got lots of tube here.

Nothing is going to change other than maybe 2.5" wide leafs one day. But the front suspension is next.

 

[Winchested]

So here's the plan.

 

[Opiebennett]

only comment would add is to make the top link adjustable at the axle end. it's a huge pita to have to rebuild a track bar because something changes in the suspension...

That doesn't work, unless you change the spacing of the joint holes at the axle end too...

 

[rockota]

That doesn't work, unless you change the spacing of the joint holes at the axle end too...

Good point.

 

[Rangerrod]

I’d have the bar intersecting closer to the heim. I’ve bent .250 antiwrap bar before. Also brace the back of the axle end brackets. These things see some force.

 

[Grendel]

I've always made the antiwrap shackle the same length of the spring shackles. So they move the same way.

Fallacy?

 

[Winchested]

I've always made the antiwrap shackle the same length of the spring shackles. So they move the same way.

Fallacy?

Ya no room for a 5" shackle. Barely fit the 3" that's why it's off the side of the crossmember not the top.

 

[Winchested]

I’d have the bar intersecting closer to the heim. I’ve bent .250 antiwrap bar before. Also brace the back of the axle end brackets. These things see some force.

I don't know if I've got any 120 wall DOM left to make a longer top one. Got a bunch of 125 HREW.

Did it bend from wrap or from landing on it? And was it set up with a shackle?

I will be using some 3" flat bar to box the axle side bracket.

 

[Rangerrod]

I don't know if I've got any 120 wall DOM left to make a longer top one. Got a bunch of 125 HREW.

Did it bend from wrap or from landing on it? And was it set up with a shackle?

I will be using some 3" flat bar to box the axle side bracket.

I think it got dented and then started bending from force. I had a shackle. You could always run it. What’s the worst that will happen it bends you unbolt it and have no antiwrap bar the rest of the day.

 

[reptillikus]

I put two braces in mine

The lower bar is solid so it wouldn't get bent in the rocks.

 

[Winchested]

Solid round bar? Holy fucking heavy.

 

[reptillikus]

Sort of? Its not that bad. I guess I could have been more clear. It's built out of 1.25" x .120" wall DOM, but the lower bar is stuffed with 1" barstock

 

[Winchested]

Ah. The TMR uses a 1.25" heim... I guess with that tiny bar size you'd want it solid.

 

[rattle_snake]

put the shackle in tension and add the green at a min

Why the green bar? side load/twist? I struggle to see how it would help in a simple axle rotation loading

Why in tension? I can understand for a leaf spring, but why for traction bar?

Tension in general will raise the forward mount in relation to the axle, and degrades working angle, aka anti squat, and lifts front end more under acceleration

only comment would add is to make the top link adjustable at the axle end. it's a huge pita to have to rebuild a track bar because something changes in the suspension...

Having an adjustable upper allows you to set/force pinion angle. This is super helpful when changing suspension, and getting driveshaft angle perfect for high speed.

 

[rattle_snake]

To reduce front end lift and unloading of chassis, I extended shackle to 6". Significant improvement.

added a brace on the bracket.
More axle separation reduces loading on bushings.

 

[Winchested]

Here's what I ended up with, I need to get 90 degree grease fittings as I frigged up their position due to me boxing in the brackets

 

[Winchested]

 

[Winchested]

Completed will see in the spring how it holds up. Sits about 2" lower than my driveshaft. If I had more body lift I could have put the shackle above the crossmember rather than on the side.

But I think it will be good and protects the driveshaft pretty good.

I'm happy with it.

Thanks for the advice guys.

 

[the_ham_sami]

put the shackle in tension and add the green at a min

What's the advantage to tension vs compression?

 

[reptillikus]

I don't think it's about tension vs. compression in regards to eliminating axle wrap; rather I think it's just that having it in compression means you can probably build the bar with less of an angle on it, and then it won't create as much anti-squat. It'll be a rock anchor though.

Mine is set up in tension because I wanted both the end of the bar and the shackle up higher and protected from the rocks.

 

[Rangerrod]

Also tension allows the suspension to droop further. I had mine in compression at first and kept tearing stuff apart.

 

[the_ham_sami]

I don't think it's about tension vs. compression in regards to eliminating axle wrap; rather I think it's just that having it in compression means you can probably build the bar with less of an angle on it, and then it won't create as much anti-squat. It'll be a rock anchor though.

Mine is set up in tension because I wanted both the end of the bar and the shackle up higher and protected from the rocks.

I hear you on the ground clearance thing. I just built one in my Samurai, the shackle is in compression. The bar itself hangs roughly an inch lower than my driveshaft so I don't think its too bad. Fitting a crossmember for the shackle took priority. Transfer case output and driveshaft don't leave a lot of room so it was easier to run a tube over everything and hang the shackle from it.

I also connected the upper and lower tubes on mine.

On a side note, I followed some diagrams from the old forum to get an idea on AS and how Anti-Wraps will affect things. The angle on mine is supposed to produce a lower anti-squat, at least thats what I was shooting for anyway. I do feel more body lift under acceleration compared to before, so probably could use some fine tuning. I know my AS is high based on my leaf spring geometry to begin with so I'm sure its compounding.