Suspension Links
Okay, boring post. I will compile all the shit I have been reading and links to what I find interesting in terms of suspension and IFS long travel. I feel like my head is going to explode from so much information I need to know to make a good design :boom:
Ultimate Goal: 12" Travel
BillaVista Tech Articles - found through Pirate4x4 where he used to write articles. Primarily coilover bible part 1 and 2 are of interest.
Barnes4WD - place to buy some stuff
Poly performance is recommended for buying shocks and stuff, they have a ton of gear
ADS shocks - free revalving for life is nice... and people claim they are really good for the price but the price actually isn't that great...
Heat treated chromoly heim ($50) - use for steering tie rod connection assuming I redesign my spindle? Don't want to use on upper or lower A arm to spindle joint since these are only good in compression and tension, don't want to put a moment on something not support at the end... Unless I go with having this on the top of the spindle so the A arm just has a bolt that bolts into this, so the upper A arm doesn't actually have a joint integral to it... heard mixed things about going that path and I don't really like the looks of that from a steering perspective... (
example)
Race ready FK uniball kit (~$60+) - use for upper and lower A arm to spindle connections...but does welding the uniball cup risk deforming the cup so the ball won't fit?
------------------------------------------------------------------------
Compilation of shit I've learned:
Shocks: cheapest dual rate reservoir coilovers are from Fox, poly performance has them at $261 a shock and free shipping. The next closest is Bilstein at $330 and then it just goes up.
Bypass shocks: Not happening anytime soon, cheapest bypass shock is over $500.
Air bump stops: Fox, bilstein, and radflo are all within a $1 and ~$170 for one bump stop. Fox has free shipping. A bump stop can looks to run $35. The issue is I need to get the bump stop as far from the truck as I can so it only engages at the very end of travel, and with it close to the rotation axis of the LCA there is hardly any travel so when it engages it wouldn't be for just the end of travel. It looks like people get a 30-45 degree bump can and angle it out to about the halfway mark of the LCA. One guy with a taco mentioned he was running 1.25" travel on the bump stop. Lowest travel you can buy is 2", but they are all the same bump stops (2", 3", 4", etc.) just there is a spacer that comes preset (or you can rebuild to your own spec) to adjust what it compresses to. The taco guy was running 85psi gas.
Coils: I'm running Eibach and like them, other people recommend them too and they are easy to come by with tons of options.
The downside with Fox shocks is to have a triple spring rate setup with a helper coil you need to remove the reservoir since the helper coil can only be slid on from the top of the shock, not the bottom. The benefit of a helper coil is that it has a very low spring rate (under 5lbs/in) and it just keeps the primary and tender coils from rattling around when at full droop because it exerts just enough force to keep them seated down. You can run without a helper coil, but you ideally would want the coils free length to be slightly longer than the shock so they don't jump around at full droop (similar to how most coilovers are). Only real downside is you need a spring compressor to take the coils off, with a helper spring you can easily compress it by hand so you can take the coils off by compressing the helper spring and then the primary and tender springs are at rest. To take apart the Fox shock you need to bleed the lines, which would be a pain especially if I'll be time constrained already from doing this all in a month. I could always run an emulsion shock, but those aren't good for high speed and it sounds like they are barely good for rock crawling so don't want to go that way.
Uniballs/heims are frowned upon as the mounting method to the frame, people prefer bushings. I will probably go that route since it's cheaper, and as people have said, it gives the suspension to frame interface a bit of give.
The shocks should be as close as perpendicular to the LCA at full compression so there is minimal sine loss.
I will check the backspacing on my current rims, which if I LT I won't really care about my back spacing as far as clearance goes so if that's a non-issue I'll keep my current rims which I like and then can just run 33x12.50R15 tires.
Still need to figure out how long Tundra/T100 CVs are. I will eventually pull my tire and get all the dimensions I need of my IFS. I am planning on running a shock hoop and probably 10" or 8.5" travel shocks. I will design in the ability to run dual shocks as much as I can but won't actually include the hardware on the LCA or hoop to mount a secondary shock during the initial build, but it will be included in the design for when I get there if I want to. It's meant to be modular afterall. My primary concern right now is the spindle. I would like to replace it to make it beefier, but it could probably do the job fine as is. It's a very engineered part if you look at it. I may just buy new spindles and then cut them up (or just cut up my current ones) and then keep the mounting hardware and just add bracing and the mounting hardware for the uniballs.
Off the top of my head costs are looking like:
$261 x 2 shocks
$170 x 4 bump stops
$125 x 2 coils
$500 fenders
$100 metal
$60 x 4 uniballs
$50 x 2 heims
$100 miscellaneous
Total Assembled Cost: ~$2500
Double Wishbone with Fenders Cost: ~$1000
This is about where I want to be and what I expected. Again, if I want bad performance and it just to work until I get more money, I can run my current coilovers and just not push the LT offroad much (which it'll be winter for the most part anyhow), and then the costs of the LT setup will be $1000. It's really the long travel coilovers and air bumps that kill it.
Time for lab, maybe that post will help someone else planning on doing LT IFS someday and totally lost on where to start... The sun is on the horizon and I'm beginning to understand what I need to do finally
