Front Camber and Caster curves?

Starting researching suspension and lifts and trying to determine how much lift and what i will need to support it. I'm seeing some information about net caster after X inches of lift and when it seems necessary to start thinking about a caster correcting UCA but not seeing any info about the OEM camber and caster curves to extrapolate at various heights. Has anyone plotted this before?

 

General rule for 2nd or 3rd gen Tacomas is over 2" lift needs or really should have caster correcting UCAs. Never seen a plot/curve for it though.

Some situations also call for UCAs where larger shocks/springs cause clearance issues, or tire spacers due to wheel backspacing or tire width causing rubbing on UCAs. This gets muddled because often when someone is doing modifications it is a combination of factors or foresight towards future modifications.

 

I've not actually graphed the curves via direct measurements, but I do know that the camber curve does go a bit askew (more negative) during the last few inches of downtravel when a mid-travel kit w/UCA is installed (these last few inches being outside of the original design parameters for the suspension). This because the shorter UCA swings down to a steeper angle vs. the lesser angle of the longer LCA while at droop.

The caster curve is not as impacted by lifting other than you do have to readjust the caster angle to compensate for it (which is the main purpose of replacing the factory UCA; to recenter the caster adjustment range so you're less likely to run out of adjustment while aligning it after it's lifted)

Hopefully that helps?
Maybe if you state your lift goals and planned use for your truck, I or someone might be able to offer up some recommendations for you.

 

Planning to buy a set of 6112/5160's and raise the front something like 1-1.5" (def no more than 2" at this time). Truck is mostly stock and doesn't have much added weight at this time other than some side steps (60 lbs) and a tonneau (70 lbs). Dont carry any significant weight on a daily basis so would leave the rear leaves alone for now. Setting the fronts at a 1.5" lift would likely level the vehicle but that is closer to 2 than 0" of lift so a caster correcting UCA would probably be needed. If the caster curve was linear from 0-2, i think it would be a good idea at even 1" given the alignment sheets i've seen people share here for lifts with no UCA's.

 

@JonF I’m running the 6112/5160 combo set at about 1.5” front and an Archive rear add a leaf. I was a little worried about caster with stock UCA but spent some time on the alignment and got really good specs. As has been said, every truck is a little different but most seem to do ok with a small lift under 2”.

 

@JonF I’m running the 6112/5160 combo set at about 1.5” front and an Archive rear add a leaf. I was a little worried about caster with stock UCA but spent some time on the alignment and got really good specs. As has been said though, every truck is a little different.