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for those interested. Here is the exact motion ratio for the SAS bilsteins. Notice it is non-linear and drops of quickly during jounce. Biggest bang for your buck at full extension, nearly 1.7. A shock with different lengths than SAS will have a slightly different motion ratio. Most of the...

Fox has same extended length as many of the other coilovers (24.3”) just like 4WP example shown. So the droop angles will be identical, just the jounce limits will be different since they have different max travel numbers.

indeed. Some poor assumptions that have already been highlighted in some of the earlier posts. However the stock front springs are definitely lighter than 506 lbs/in. Especially the non-SAS flavors.

Utility of 3D kinematic model Model was developed in order to quickly evaluate different shock lengths and control arm geometries. Different shocks As an example, shown are two different shock configurations: SAS bils (23.31” ext and 17.06” comp) and 4WP (17.69” ext and 24.32” comp)...

MODEL DESCRIPTION For those interested, here is a brief description of the model. Parametric equations for the circular motion of both ball joints within their respective planes of motion were developed. The full 3D motion of each ball joint was then determined in the global coordinate system...

FULL 3D KINEMATIC MODEL OF FRONT SUSPENSION I have finally included the upper control arm (UCA) into the model. So it now represents the full kinematic motions of both the upper and lower ball joints on the knuckle. The model is also now fully 3D and includes “out-of-plane” motions. NOTE: this...

Waiting around to connect to the servers could add up to a bunch of beers.

this can’t be overstated. the oem IFS wheel travel has a pretty tight design envelope, strictly based on kinematics, ie, hard points and knuckle/ control arm geometry. So not much room to play with shock lengths, unless upper shock tower is altered; ie, design envelope is from roughly 24.3” to...

WHY… CRAZY… CG as low as physically possible on portals would be my plan…

compatibility is not the issue, Procal is.

@H0pelessOpus Your equation is not what is posted. You have a typo. for your case. +55 offset with 33.8” tire. Rscrub= (147 - 55) - 0.233 * (33.8/2) * 25.4 - (33.8/2) * 25.4 * sin (1) = -15 mm see red curve from figure (scrub radius) and for a 33.8” tire it also shows a -15 mm scrub radius...

the badlands oem non SAS rim is +55 offset. Here are the results for that wheel offset. All units are mm and degrees for the equations. The plot is shown for tire diameter in inches to make it easy. If you do the calculation for your tire of interest you will be on these curves somewhere, as...

Good info here. See post #5. By @jeff in ohio https://www.bronco6g.com/forum/threads/front-unit-bearings-safe-to-run-without-a-cv.85001/

Indeed. Stronger tubes is a big deal. Here is a plot I made for tube strength normalized to the OEM M220. Some hypothetical tube diameters as a function of wall thicknesses. Increasing tube diameter is a bigger benefit than wall thickness but both help. The D60 is almost 3 times as strong as...

@5GENIDN some things can only be appreciated by us old timers. There once was an engineering design world before CAD. 😳

Love it and admire the motivation. We gotta keep pushing otherwise we just stand still. Inertia is a bitch. today’s “seamless” was yesterday’s how the fck do I do this.

I don’t have CAD files just some accurate 3D locations for the critical link end points. The analysis is in a spreadsheet according to this 2D geometric model. Don’t be confused by the CAD pics. They are just cool visuals to help understand the geometry.

A comment on the beauty and engineering simplicity of the steering system, everything revolves about the steering axis. Pun intended. on the resistance side you have the forces at the tire contact patch and its moment arm (scrub & trail). Let’s assume the tire/ground forces are unknown and can...

yes indeed. Contact patch and the actual tire/ground surface force is highly complex. Depends on more variables than can be addressed. All different kinds if scenarios can happen when you are out there, ice, loose rocks, deep mud. Very hard to control. We air down to help increase the contact...

understood. the best thing about the highly technical threads on B6G is that it gets folks thinking. That’s when new thoughts and ideas emerge. I know I have benefited greatly from many of the deep thinkers on here. We all learn something. I learned that TLDR doesn’t mean TwoDR. Go figure.