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Thread: Psc steering and shock setting

  1. #1
    Hooked kpig's Avatar
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    Psc steering and shock setting

    Someone, please explain this. I've had the PSC hydro assist on my JK for the last year along with a Prorock 44 with Prosteer ball joints. About 3 months ago after a trip to Hot Springs OHV, the steering became very twitchy on the highway. Since then, I have called PSC for advice and began troubleshooting by replacing anything that had any excess play. Still twitchy and wandering over 65 mph. I had the alignment checked. Caster at 5.7 degrees (pinion is still ok at 4.3 degrees). Toe was a bit high at 3/8", so adjusted to 1/16". Today, I remembered that prior to that trip I had the Fox shocks set on 3 or 4 of the 7 compression settings. The shocks have been at full compression 7 of 7 since then. I would think that the higher compression setting would overcome the twitchyness and darting on every road imperfection. Well, I lowered the compression setting back to 3, and voila, tracks straight and no more twitchyness all the way up to 80mph. What the heck? Someone please explain how the heck a simple shock setting can cause such grief.


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  2. #2
    Guy with a Red 2-Door cozdude's Avatar
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    The shock is so stiff that it isn't allowing the axle to travel. So your basically bouncing over the road rather than floating over it if that makes sense
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  3. #3
    Hooked kpig's Avatar
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    Makes sense. I'm just a bit shocked (pun intended) that it would make that big of a difference. I'm a bit concerned because I am planning on the DTD, but I don't want the twitchyness to come back having two shocks at each corner. Thanks for the reply.


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  4. #4
    Guy with a Red 2-Door cozdude's Avatar
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    Quote Originally Posted by kpig View Post
    Makes sense. I'm just a bit shocked (pun intended) that it would make that big of a difference. I'm a bit concerned because I am planning on the DTD, but I don't want the twitchyness to come back having two shocks at each corner. Thanks for the reply.


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    I wouldn't be concerned with that set up. It's way more adjustable than your current set up so you can really dial in the ride with different spring rates, compression and rebound rates and so on. Tons of combinations to be had
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    October 16, 2013, wednesday early evening, east of the pacific ocean, selectee for truly random and boring Parking lot photo of the moment grand platinum prize winner!

    2011 JK
    EVO Bolt-on Coilovers, EVO 1/4 pounder w/ stinger, 37" Cooper STT Pros, PR44, and some EVO stuff

    Awaiting install-
    On Order-
    Want list- Evo carrier and skins, PSC hydro assis

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  5. #5
    Addict jeeeep's Avatar
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    Quote Originally Posted by kpig View Post
    Someone, please explain this. I've had the PSC hydro assist on my JK for the last year along with a Prorock 44 with Prosteer ball joints. About 3 months ago after a trip to Hot Springs OHV, the steering became very twitchy on the highway. Since then, I have called PSC for advice and began troubleshooting by replacing anything that had any excess play. Still twitchy and wandering over 65 mph. I had the alignment checked. Caster at 5.7 degrees (pinion is still ok at 4.3 degrees). Toe was a bit high at 3/8", so adjusted to 1/16". Today, I remembered that prior to that trip I had the Fox shocks set on 3 or 4 of the 7 compression settings. The shocks have been at full compression 7 of 7 since then. I would think that the higher compression setting would overcome the twitchyness and darting on every road imperfection. Well, I lowered the compression setting back to 3, and voila, tracks straight and no more twitchyness all the way up to 80mph. What the heck? Someone please explain how the heck a simple shock setting can cause such grief.


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    I have a PR44, PSC ram assist, Dynatrac PRO Steers and Rancho 9000's - I can set the rancho's at their stiffest setting when traveling and will hit 80+ mph without the wandering you're describing - I don't purposely take that speed but sometimes I have a good tailwind ;

    What's your tire pressure set at? I put mine to 37 when traveling, 32 around town - 37's BFG KO2

    When I 1st had the PR44 installed, the shop put too much caster in it and i was getting wandering, I took it closer to 4* and no issues since.

    Also check your PSC fluid level to make sure you don't have a leak or an air bubble but I'd put my money on the caster

    The lower level on the shocks may actually have been masking the problem all along

  6. #6
    Knows a Thing or Two tgoss's Avatar
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    Have you checked your unit bearings? More or less that's something that I find can play and with my PR44 I had to replace them twice last year and it help tremendously with this issued (I'm running your same set up).

    Also check the usual: track bar torque and ends, drag link torque and ends, tie rod torque and ends....

  7. #7
    Hooked kpig's Avatar
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    Quote Originally Posted by jeeeep View Post
    I have a PR44, PSC ram assist, Dynatrac PRO Steers and Rancho 9000's - I can set the rancho's at their stiffest setting when traveling and will hit 80+ mph without the wandering you're describing - I don't purposely take that speed but sometimes I have a good tailwind ;

    What's your tire pressure set at? I put mine to 37 when traveling, 32 around town - 37's BFG KO2

    When I 1st had the PR44 installed, the shop put too much caster in it and i was getting wandering, I took it closer to 4* and no issues since.

    Also check your PSC fluid level to make sure you don't have a leak or an air bubble but I'd put my money on the caster

    The lower level on the shocks may actually have been masking the problem all along
    I've been running anywhere from 24 to 32 psi with minimal effect.

    I'll try decreasing the caster a bit too.

    I've checked and re bled the system soooo many times. Can't find any leaks.

    Thanks for the suggestions.


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  8. #8
    Hooked kpig's Avatar
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    Quote Originally Posted by tgoss View Post
    Have you checked your unit bearings? More or less that's something that I find can play and with my PR44 I had to replace them twice last year and it help tremendously with this issued (I'm running your same set up).

    Also check the usual: track bar torque and ends, drag link torque and ends, tie rod torque and ends....
    The unit bearings are the only thing I haven't changed out. I checked them but can't detect any discernible play. Other than pulling on the hub is there another way to see if they are bad. The alignment showed 0 degrees camber on both sides.


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  9. #9
    Hooked kpig's Avatar
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    I have a new fitting coming from PSC to try to restrict a bit of fluid volume from the pump. With the gearing at 5.38, PSC suggested trying it out to make the ram a bit slower at such high rpms at highway speed.


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  10. #10
    Knows a Thing or Two Irish JK's Avatar
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    I'd be much more likely to start with either loose bolt somewhere or chalk up the difference to tire wear.
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