Northwesttaco's 80 series crawler slammed on 4d's and BS

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Lookin good! Be interested in seeing how it all behaves once you get it back on the road. Keep up the good work and quick progress!
 
northwesttaco said:
I got the coil overs. But went with 200/250. It's what King reccomended and @Apounder is running the same.
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Right on. I'm running 200/350 which is about 16 lbs/in stiffer. It's fine but I want more preload so I think I'm going to drop down to a 250 lower as well.
 
nukegoat said:
Right on. I'm running 200/350 which is about 16 lbs/in stiffer. It's fine but I want more preload so I think I'm going to drop down to a 250 lower as well.
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Wouldn't that be 100 pounds per spring stiffer? From what I can tell to read spring rates is the weight stated compresses the spring one inch. So for a 200lb spring it takes 200lbs to compress it one inch. But could be wrong?
 
That is true for single springs, when you have dual springs there is a formula to follow, but most people use a spring calculator. The short of it is you compress both springs with 100lbs not just one of them. So with 100lbs and a 200lb spring and a 300lb spring, you would compress the 200lb spring 0.5" and the 300lb spring 0.33" so a combined total of 0.83" for a spring rate of 120lbs/inch.

northwesttaco said:
Wouldn't that be 100 pounds per spring stiffer? From what I can tell to read spring rates is the weight stated compresses the spring one inch. So for a 200lb spring it takes 200lbs to compress it one inch. But could be wrong?
Click to expand...
 
northwesttaco said:
Wouldn't that be 100 pounds per spring stiffer? From what I can tell to read spring rates is the weight stated compresses the spring one inch. So for a 200lb spring it takes 200lbs to compress it one inch. But could be wrong?
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Not at all, no.
scottryana said:
That is true for single springs, when you have dual springs there is a formula to follow, but most people use a spring calculator. The short of it is you compress both springs with 100lbs not just one of them. So with 100lbs and a 200lb spring and a 300lb spring, you would compress the 200lb spring 0.5" and the 300lb spring 0.33" so a combined total of 0.83" for a spring rate of 120lbs/inch.
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This, but it's easier expressed as the formula:

Spring 1 * Spring 2
---------------------
Spring 1 + Spring 2

so, in this case, 60,000/500 = 120 lbs/in.



200/350 = 127ish lb/in
200/250 = 111ish lb/in

Bear in mind that standard ome or tjm front lift coils are often in the 300lb/in range, plus the OE sway bar offering some 150lb/in of roll resistance, plus you have the giant sway bar known as the axle tube when connected with radius arms.

Going from 450lb/in + the radius arm roll resistance to a mere 111 lb/in and you're going to definitely notice the ol' swoopy mc swoopyface suspension that everyone pretends isn't there.
 
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scottryana said:
That is true for single springs, when you have dual springs there is a formula to follow, but most people use a spring calculator. The short of it is you compress both springs with 100lbs not just one of them. So with 100lbs and a 200lb spring and a 300lb spring, you would compress the 200lb spring 0.5" and the 300lb spring 0.33" so a combined total of 0.83" for a spring rate of 120lbs/inch.
Click to expand...
nukegoat said:
Not at all, no.


This, but it's easier expressed as the formula:

Spring 1 * Spring 2
---------------------
Spring 1 + Spring 2

so, in this case, 60,000/500 = 120 lbs/in.



200/350 = 127ish lb/in
200/250 = 111ish lb/in

Bear in mind that standard ome or tjm front lift coils are often in the 300lb/in range, plus the OE sway bar offering some 150lb/in of roll resistance, plus you have the giant sway bar known as the axle tube when connected with radius arms.

Going from 450lb/in + the radius arm roll resistance to a mere 111 lb/in and you're going to definitely notice the ol' swoopy mc swoopyface suspension that everyone pretends isn't there.
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Ahh makes sense.

Yeah I know there will be much more body roll but won't be too bad.
 
Notch said:
Damn, looks slick!
What did everything get painted with? I see lots of shops out west (via the internet haha) just spraybombing suspension and frame modification projects for customers. Where I live aerosol paint lasts less than a year so we have to use stuff like imron or base/clear if it needs to stay looking nice and not rust.
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yup
 
Notch said:
The sheetmetal work on the fenders is terrible but do appreciate the rest of the project and the boat-like money you're dropping.
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thats why your doing mine soon
 
Just found this thread...Super fast build.
What are your plans out back, are you going with inside or outside with that huge 40" tire?
 
nukegoat said:
Bear in mind that standard ome or tjm front lift coils are often in the 300lb/in range, plus the OE sway bar offering some 150lb/in of roll resistance, plus you have the giant sway bar known as the axle tube when connected with radius arms.

Going from 450lb/in + the radius arm roll resistance to a mere 111 lb/in and you're going to definitely notice the ol' swoopy mc swoopyface suspension that everyone pretends isn't there.
Click to expand...

Those are all devices of elastic weight transfer, you also have geometric roll resistance you could leverage (hah!) on a lifted, linked, big tire rig to help tame the swoopyness of the whole package. No doubt soft springs will still be very squishy no matter what you do.
 
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Picked it up this morning and now at my other shop. Negotiated install of ARB compressor and air lines into the cost of building the diffs. Picking it up tonight and should be in the snow tomorrow assuming the pass is okay.
24" frame height on all corners
IMG_8620.webp
 
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