SPC Arms Caster Help - Second Generation Nissan Xterra Forums (2005+)
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post #1 of 24 (permalink) Old 03-19-2017, 05:14 PM Thread Starter
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SPC Arms Caster Help

Ok, so I thought I could figure it out but for some reason I am having spatial comprehension issues in my head.

My caster is about 2.14 on both sides of my truck. I am trying to increase it to around 2.70 - 3.00.
I have the truck jacked up and the wheels off in the front. I can't figure out how to adjust the SPC arms to get more caster.

Here are the directions from SPC:




I am currently in Position B. I think Position "A" or even one tick past that would increase caster. Is this correct?

Also, will this also increase the wheelbase width by another half inch or so?

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post #2 of 24 (permalink) Old 03-19-2017, 05:49 PM
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You do notice the position is for camber adjustment? From what I've heard on the titan SPC arms you slide front/rear to adjust caster.


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post #3 of 24 (permalink) Old 03-19-2017, 06:08 PM Thread Starter
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Quote:
Originally Posted by Snowtrout View Post
You do notice the position is for camber adjustment? From what I've heard on the titan SPC arms you slide front/rear to adjust caster.
Yep, you are correct...... the ball joint was in the middle and I just slid it all the way to the front.

I noticed it was for camber but I thought it could also be utilized for caster somehow. Sometimes I amaze myself with my own stupidity

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post #4 of 24 (permalink) Old 03-19-2017, 06:32 PM
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From the instruction sheet for Part NO. 25560 Nissan Titan/Armada Front Adjustable Control Arm pictured in post #1 [http://www.spcalignment.com/instruct...60-INS_WEB.pdf]:

Quote:
Setting Alignment: Initially, set all four lower control arm cams to centered positions. From there, use lower eccentric cams to fine tune camber. Once desired camber is achieved, set caster by sliding the ball joint in its slot.
SPC Installation Video @ 4:25: "Adjust caster by sliding ball joint in slot on control arm."
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post #5 of 24 (permalink) Old 03-19-2017, 08:36 PM
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Here's an image:

http://www.steedablog.com/wp-content...r-diagram1.jpg

Take a look at the slot in the control arm - you need the steering upright/steering knuckle to be tilted toward the back of the vehicle. The ball joint is mounted in a slot that goes front to back - so you just need to slide the ball joint back. The trick is getting both sides the same. That's hard to do and will most likely require an alignment to get your cross caster back to 0. Do not rotate it to the other A/B/C positions - that will change the camber.
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post #6 of 24 (permalink) Old 03-19-2017, 08:48 PM
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You want to move the top of the spindle toward the rear of the vehicle.


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post #7 of 24 (permalink) Old 03-19-2017, 10:24 PM
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Curious....what does adjusting caster (towards rear as @jsexton suggested) do for handling?

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post #8 of 24 (permalink) Old 03-19-2017, 10:53 PM
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SPC Arms Caster Help

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Originally Posted by JOSX2 View Post
Curious....what does adjusting caster (towards rear as @jsexton suggested) do for handling?

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Better return to center and less steering input needed. It basically tightens things up assuming there aren't other parts worn out.
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post #9 of 24 (permalink) Old 03-19-2017, 10:54 PM
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Ahhh. Interesting. Thx!

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post #10 of 24 (permalink) Old 03-20-2017, 01:05 AM Thread Starter
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Quote:
Originally Posted by roguebuck View Post
Take a look at the slot in the control arm - you need the steering upright/steering knuckle to be tilted toward the back of the vehicle
Quote:
Originally Posted by jsexton View Post
You want to move the top of the spindle toward the rear of the vehicle.
That is what I thought I should do as well. However, this was my experience:

At full droop and with the wheel off, I loosened the SPC ball joint 32mm nut (or whatever it is) just enough so that it could be moved. I left the camber setting in the "B" position. As I moved the ball joint all the way to the back of the UCA, the hub actually moved backwards with it. So I tried moving it all the way forwards. The hub also moved forward.
I secured it as frontwards as possible on both sides.

I drove it on the highway at ~65mph and my loose steering problem was definitely remedied. It feels much tighter now with more return to center and less play at center. I can't verify that my caster is increased (didn't take any measurements) but it certainly drives MUCH better.

I also would expect the hub to pivot forward as the top of the spindle was moved backwards. But in my case moving the top of spindle forward also moved hub forward, so I'm not exactly sure what happened to caster. Hmm...

(Driver side) Before:



(Driver side) After:



(Passenger side) After:


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Last edited by AlbatrossCafe; 03-20-2017 at 04:05 AM.
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  Second Generation Nissan Xterra Forums (2005+) > Xterra Tech Topics > Suspension & Steering

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