RUCAs for camber better for toe curve? (or, why noone using trailing arms?)

[prj3ctm4yh3m]

Originally Posted by Racecomp Engineering

I assume you mean toe and not tension.

Our car used the whiteline rear adjustable upper control arm bushing and we did not need any toe adjustment beyond what the stock arms allowed us. This is true for cars with adjustable lower control arms in most cases.

- Andrew

No, tension/traction arms.

[mav1178]

Originally Posted by prj3ctm4yh3m

No, tension/traction arms.

There is a ton of info about rear traction arms and what they do, especially on Nissan RWD forums.

Nissan ran this rear suspension setup for almost 20 years, and just so happens to be cars wildly popular. S13/14/15, Z32, R32/33/34, other JDM RWD chassis.

The rear setup on our cars is slightly different, but the basic idea is the same. Most people end up going with adjustable LCA because it's easier to work with. Not ideal, but easier. If you wanted ONLY camber adjustment without affecting toe as much, you'd go with adjustable upper arms, but then you'd find that 1) there's a ball joint, and 2) there's no room to work with.

Oh, and too much negative camber in the rear will force you to get adjustable toe arms, as the toe adjustment is maxed out.

-alex

[prj3ctm4yh3m]

Originally Posted by mav1178

There is a ton of info about rear traction arms and what they do, especially on Nissan RWD forums.

Nissan ran this rear suspension setup for almost 20 years, and just so happens to be cars wildly popular. S13/14/15, Z32, R32/33/34, other JDM RWD chassis.

The rear setup on our cars is slightly different, but the basic idea is the same. Most people end up going with adjustable LCA because it's easier to work with. Not ideal, but easier. If wanted ONLY camber adjustment without affecting toe as much, you'd go with adjustable upper arms, but then you'd find that 1) there's a ball joint, and 2) there's no room to work with.

Oh, and too much negative camber in the rear will force you to get adjustable toe arms, as the toe adjustment is maxed out.

-alex

Thank you. I did some reading on nissan forums (jealous of how many options they have for knuckles etc. Just wow). Tension arm placement differs as you mentioned so not 1:1 unfortunately. I think i will go racer X ruca and just fine tune with lca, leaving tension arms alone.

[mav1178]

Originally Posted by prj3ctm4yh3m

(jealous of how many options they have for knuckles etc. Just wow).

Don't be jealous. It's a byproduct of 1) 30 years of Nissan mods, 2) 20+ years of using the same front/rear suspension on a wide range of cars, and 3) not changing fast enough to the market and increasing cost of production and running yourself into (almost) bankruptcy. I'm sure in 1995 there were zero options for adjustable knuckles... so we're only 4 years in to this "21st century entry RWD Japanese market", wait 10 more years then be jealous.

Rear multilink is great, but from a cost perspective it's not the best, especially when your entire company struggles. See: Nissan in 1990s.

Our entire suspension is a compromise. Basically it's built to Toyota specs but with recycled Subaru parts whenever possible.

-alex

[prj3ctm4yh3m]

All very true.

Re market demands probably a discussion to be had around the japanese foray into CVTs.

[DeaconRoc]

I have the Whiteline upper camber bushes. They're a bit of a pita to fit but not too bad. Adjustment is also not too bad with the car up on a ramp but can take a few goes to get right. What I like about them is that as well as allowing you to correct the camber they also take some slop out of the rear of the car.

[xwd]

I have the RacerX UCAs and you do need to pop the ball joints out to adjust them and the your adjustment range is about .5 degrees at one time. Mine happen to be adjusted to right at 2 degrees with the car lowered a bit so they work well for me, doubt I'll ever change them from that.