daily doubler build

[Bray D]

On a side note, your not too far off my weight there Bray. Loaded with gear I was 4800lbs (no doubler) with the same axles and wheel/tire setup.

I'm sure I'd be right around that fully loaded with "Adventure gear". Running my tube doors will strip a lot of weight though, so hopefully I would still be around the mid 4k's.

 

[wahlstrom1]

Loaded for UA with passenger.... I was hitting 6k lbs, it sucked to wheel loaded and they make ya do it just so ya know!

 

[Bray D]

Loaded for UA with passenger.... I was hitting 6k lbs

Holy chit.

 

[Bray D]

I ran across another scale. 4500lbs on the nose with a full tank (gas station less than a block away) and full tool box. Driver inside.

I solved the tire balance issues I was having with new wheels and tires (yeah, they were wobbling after I got them balance the first time). Since they didn't smooth out after being 'balanced', I put some thought to it.

Without going in depth, think about what happens when you apply a balance weight to the wheel - but that balance weight isn't in the same plane as the center of mass of the tire/wheel assembly. It creates a pure moment that will try and turn your steering wheel if installed on the front.

Static balance isn't enough. Tires MUST be dynamically balanced to counteract the moment I just described.

I did a sample calculation using a 50lb tire/wheel assy with its center of mass having a radial eccentricity of .125" located in a plane that is 1" forward of the wheel mounting surface. For my conditions, it took 11.75oz to statically balance it, but ANOTHER 28+oz to dynamically balance it.

If you're having tire wobble troubles, do some serious research on dynamic balancing. Some tire techs know what it is and how to do it, others are clueless. I haven't found one yet that truly understands what they're doing. They just do what the machine tells them to.

Anyways, I got it figured out. It took 2hrs of spinning tires on their machine, but the truck rides like a Caddy again.

Makin progress on the sliders. Still need to skin them and build the supports running to the frame. Picking up material for the supports tomorrow after work.

old vs new. Slightly wider main wing with a 2.5" kicker.

 

[4.0B2]

LOVE the sliders... i wanna build some like that for my b2.

 

[escort_gts]

I know exactly what you mean....discount tire doesn't know how to balance tires. That's why I keep going back every few weeks to get one tire balanced, and why it has 13oz on it.

Sent from my PC36100 using Tapatalk 2

 

[Josh40601]

How are you planning on skinning them? Thin sheet dimple dyed? Cuz that would be hawt

 

[Bray D]

LOVE the sliders... i wanna build some like that for my b2.

Thanks man. I like how they're turning out.

I know exactly what you mean....discount tire doesn't know how to balance tires. That's why I keep going back every few weeks to get one tire balanced, and why it has 13oz on it.

My tires have far more than 13oz on them, but they ride beautifully. Make sure you find a place that knows how to dynamically balance. If they don't add weight to both the inner and outer lip of the wheel, they should be adding surface weights 180* from each other on different planes to create that 'counter-moment'. If they're not, they're not dynamically balancing (unless they luck out and are able to place the balance weight in the same plane as the center of mass).

How are you planning on skinning them? Thin sheet dimple dyed? Cuz that would be hawt

They need to be smooooth on the bottom. 2.5" wide (width of the flat between the radii on the 3" wide rectangle) x .125" thick strap on the bottom. I'll plug weld as well as edge weld but it'll be ground smooth.

 

[Josh40601]

Ahh, ok. Looking forward to seeing them all welded up!

 

[kroussinoffroad]

balanced tires whats that? havent done that since i was on 235's

 

[Bray D]

balanced tires whats that? havent done that since i was on 235's

I feel sorry for your wheel bearings.

 

[Sasquatch_Ryda]

Ran my 36's unbalanced for 4 years with no wheel bearing issues?

Gonna throw BB's in my 40's.

 

[kroussinoffroad]

only issue ive ever had with bearings is water infiltration

 

[Bray D]

An unbalanced tire cyclically loads bearings. Whether it caused failure or not, it probably shortened it's life. Granted we're not very nice on our vehicles anyways (offroading in general), but I try to eliminate any unnecessary abuse whenever possible.

You guys drive at highway speeds? How does that not drive you crazy? Every vehicle should go down the road smooth - regardless of tire size.

I've been doing some Simulation work with the supports that run from my sliders to the frame. Kinda interesting, I'll post up in a few.

 

[Bray D]

Old design support to frame. 4" separation at frame. 2" left unsupported. 1" sch. 80 round pipe.

New design support to frame. .125" thick wall. 4" tall at frame, taper to 2" tall at slider. 1.125" wide.

I 'fixed' the mount at the frame, and applied a 2000lb load at the free end.

Old design deformation plot. 1.31E-4mm max displacement.

New Design displacement plot. 9.45E-5mm max displacement.

Granted the displacements are in mm, we'll look at percentages to get an idea of relative rigidity.

Looks like the new design will deform 72% as much as the old design under these loading conditions. 28% improvement? Not bad at the moment. I investigated adding another layer of strap to the top and bottom to make them .250" thick. It added some strength, but I'm not sure if it's worth it yet. I'll probably add some gussets as well that may add strength. I'll keep playing with it for a while, but this will be essentially the new geometry - as defined by spatial constraints.