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Setting Up I-Beams for LT/Desert Racing?


atomicjoe23

Well-Known Member
Joined
Oct 3, 2008
Messages
122
Vehicle Year
1979
Transmission
Automatic
Wasn't really sure if this was the right sub-forum or not, but I'm talking about I-beams so here goes (moderator. . .if this is the wrong sub-forum, feel free to move it to the PreRunner, Extreme Suspension, or Fabrication forums. . .whichever one it belongs in. . .thanks!)

I've got a few questions on setting up I-beams that I hope you guys can help me out with (please humor me on this one). . .

. . .if I have a front I-beam set-up and have to locate my own bracketry. . .what angles should the I-beams be set to (when viewed from the front) at ride height, full droop, and/or full bump? Which position is most critical. . .right now I'm thinking full bump to make sure that I don't have any interference issues when the suspension is fully compressed.

The location of the brackets at ride height will determine the I-beam length. . .or the I-beam length and bracket location will determine ride height. . .whichever way you care to look at things. . .

If no one can really answer this then if someone could go out and throw an angle finder on their I-beams of their F-150/Ranger/Bronco and let me know what your angle is at ride height I would greatly appreciate it!

If you have a LT I-beam set-up and you're gonna make extended radius arms what angle should you shoot for as the maximum angle of the radius arms at say full droop and full bump. . .obviously the longer the radius arms the bigger the arc that they travel through and the maximum angle they achieve is smaller.

Right now I have my custom set-up in AutoCAD. . .I'm trying to keep the center of gravity as low as possible at ride height. Right now I'm starting totally from scratch. . .I don't have an I-beam set-up to reference off of (and A-arms aren't an option. . .A-arms are great, but they created a few issues due to packaging constraints in my application that I can't really fix. . .so I need a different front IFS set-up). . .

Here is how I have the I-beams set up in AutoCAD right now. . .I have 1/2" of clearance between the I-beams and the frame at full compression (8" bump & 8" droop right now. . .that may change some though). . .at full compression there is ~4.25" ground clearance for the lowest point hanging below the vehicle (at this point that is the I-beams).

I am currently designing it for 2* negative camber @ ride height and a KPI of 9* @ ride height (I know that you typically see about 12-14* KPI in off-road vehicles, but I didn't build this knuckle and I don't know if I will have time to build my own knuckle or not so for right now this is pretty well set).

I currently have caster at 2* but I think I might change that to ~6* (was suggested to me on a non-I-beam forum so I'm not sure about that at the moment).

Any input or suggestions for me?

Thanks guys. . .I really appreciate it!
 

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