Don't Install Trailing Arms Before You Watch This! Ultimate Land Rover Discovery Build Episode 28
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- čas přidán 26. 11. 2022
- Let's talk about Trailing arm rear suspensions! On the right 4x4, this offroad suspension style can be a huge asset. Freeing up some space, building a beefy lower link, and using a smaller Coilover are big advantages. BUT there are two sides to this story! I don't recommend Trailing arms for most offroad builds. They add complication to the initial setup, add weight and even reduce ground clearance. In this video, I want to help give you the basics so you can make a decision that will appropriately suit your project. Enjoy this video! Next week we will get this Landrover Discovery on the trail to test out these new mods. See you then!
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Just a note to consider. When you put together a trailing arm and limit the movement for the shocks with a wobble stopper, you're keeping that arm vertical to the ground even at full flex. That means all the misalignment of the axle angle has to be available in the joint on the axle side. This is why we sometimes have to step up to a joint even bigger than a 1.25 heim with high misalignment spacers on the rigs with massive travel amounts and flex. Your axle on that may not articulate a lot on that particular build, but those Johny joint style joints are really limited, be sure to cycle the suspension to full flex and confirm that joint is going to be able to handle the misalignment you need.
Your maths for spring leverage is wrong. Moving the mount in 50% will increase leverage 100%. It's x/0.5=2x
I think your spring rate math is wrong. If your spring is located 25% short of the axle, then it's 3/4 of the way from the pivot point. So, since the spring moment arm is 3/4 the length of the axle moment arm, the new spring should be 4/3 (reciprocal of 3/4) of the original spring rate, which is 33% more - barring other changes of course.
Your next tool should be a lathe and you’ll never have to worry about sourcing issues. I’m sure you knew that already. 😊
You can almost certainly find your sleeve material/dimensions on McMaster. You're definitely going to pay a premium, but they have everything under the sun in stock. I'm spoiled because the warehouse is a mile down the road from me in SoCal.
Might be time to add a metal lathe to your arsenal of tools.
You definatley need a lathe.Even a bench top model would work for tons of smaller parts like this and keep you rolling through a project rather than waiting days or more for a part.
FYI, your spring rate estimation is a bit off. To get the same effective spring rate you need to divide the current rate by the square of the motion ratio. New=current/(MR^2). So for example if you current spring rate is 300 lb/in and assuming the motion ratio is .75, then he would need about a 530 lb/in spring to achieve the same effective stiffness.
Honestly for the amount of work you do I would say why not buy yourself a small metal lathe. I have one and making those sleeves and simple parts don't take much and you could take tubing you have and resize the inside. Won't be too expensive but will get you off a pinch
McMaster and find somebody with a lathe, would be a simple job
Nate, you totally missed the opportunity to call this video "TROPHY TRUCK SUSPENSION SWAP" or something similar. Jokes aside, very happy to see something like this on your channel. I've always been interested in trailing arm style suspension, but haven't seen any good videos on it aside from the standard 4-link setups you'd find on a jeep/similar.
For the sleeves, order some 3/4 rod and cut/drill to your length. Or I'm sure you could have a machine shop make you some also.
Perfect time to get yourself a lathe! Make your own sleeves and then whip out a set of delrin bushings the correct length!
Nate, great episode. Got a tip for you for your forklift: convert your tank to a standard 20 lb grille tank. Easier & faster to fill (just swap), and you don't have to worry about tank recertification. I did this to mine and love it...
That trailing arm is a work of art. I'd definitely beef up those frame mounts too
I really want to 4link my 1990 Suburban but it’s a daily driver and occasionally a trail rig. Thanks for the Trailing arm info. Just more information to make a educated decision
Mmmmmm...... you said cake!
Love being able to see the changes in plan with the explanation of why! Super cool to see the process
It's always a good Sunday morning when I get to watch Nate building something and I get to learn at the same time! Suspension's are really interesting, the geometry involved is fascinating to say the least!! Happy Thanksgiving Nate and to all of yours!
great explanation of trailing arm pro-con, it was very insightful. Always great content!!!