gmorat

So I just ditched Bilstein HD's and got PSS10's which were installed and then set to 3 front and 4 rear which is tight but maybe a little stiff for the awful but amazing roads around here.

Whats the use of adjustable suspension if you don't try some adjustments so I changed it to 1 in the front and 2 in the rear. I have a feeling I'm going to Goldilocks this in a couple of days to 2F and 3R but what have other people done?

Stock sway bars and 18" conti extreme contact sport XL tires.

fishoop

I sure hope you didn't snag the last set from S Car Go - i've been slacking bringing my car in to install the upgrade! Looking good!

Tlaloc75

I like 4/5 for lumpy roads and 6/7 for smooth roads.

MarinS4

I feel you’re gonna need more than that to handle the twisties around here. It’s tough to find the right settings that give you the best of both worlds. On the PSS9’s I run 4R 5F to control the chassis when driving it hard. The next setting down 5R 6F rides nicer but does not control the car very well. My go to loop is Fairfax to Nacasio, then I weave my way back through Petaluma. Some of those roads challenge all aspects of the suspension. It’s sure is fun though!

Tlaloc75

PSS10 are the opposite of PSS9 (confusingly). 5/6 would be stiffer than 4/5.

tosha

I've been pretty unhappy with the stock PSS10 spring rates on 18" wheels in the Bay Area in my '96 cab. A low dampening setting with stiff springs causes weird wobbling below 5 front/6 rear. My tire pressure is 36/39.

I highly recommend getting slightly softer springs for PSS10 as described in this thread if you often drive aggressively on the street: https://rennlist.com/forums/993-foru...ing-rates.html

I found traction and overall comfort to be much improved.

Here's what I changed:

Front main spring:
Original: RF200040, 200-40, 225 ft lb
New: RF200030, 200-30, 171 ft lb

Front tender
Original: ZF060-045, 60-60-45, 255 ft lbs
New: ZF060-025, 60-60-25, 143ft lbs

Rear main
Original: RF180070, 180-70, 405 ft lb,
New: RF180060, 180-60, 343 ft lb

Rear tender
Original: (part not listed), 80-60-x, 570 ft lbs
New: ZF080-060, 80-60-60, 343 ft lbs

r6elmo

question to above poster - does the tender spring rate impact the overall spring rate? I always thought the tender would have minimal rate - was more to keep the main spring extended at droop.

tosha

Apparently it does because the PSS10 setup doesn't fully compress the tender spring in the rear. I didn't confirm it with my installer, but that was reported by the author of the thread I referenced earlier.

tosha

There may also be other root causes for sense of instability with the stiffer PSS10, like bump steer and worn bushings. I was assured that my bushings were fine, but I may replace rubber bushings in the suspension soon. I'm also pretty sure I still feel bump steer. Apparently, Elephant Racing has solutions to this.

GregR

I wrote that update on my spring conversion on PSS10’s a while ago, but recall I went with lower tender springs as the other choice was to stick with the originals which were pretty high compared to the new main springs.

There was another person who did just the main springs and left the tenders the same. That person did not appear to like the results. Not sure if they ever changed to the lower rated tenders as Tosha and I have done.

If you can find a setting you like without changing springs I would recommend that. But, if like me they are just too stiff and you already own PSS10’s the spring change gives new life to the setup. Two years into the swap and I still love the suspension setup.

If you get up to the Seattle area look me up and I would be happy to take you or anyone for a drive.

gmorat

Without having gone through all the settings available and considering the cost, the chances of changing components now is zippy chance!

It's easy enough to put the car up on the lift to change the settings and there's no shortage of great yet terrible roads to test it on.

Gonna step up from 1F/2R in increments to see if there's a setting that allows me to have something comfortable on a day to day which works for more spirited jaunts. If not, then it takes 5 minutes to change between settings. Just changed to 2F/3R which means I have to go for a drive! Oh noes!!!

tosha

Sounds good. If you have a long, isolated road, you can test for bump steer, which could be contributing to the sense that the suspension is not working correctly. Go up to 80mph and brake very hard. If the car feels squirmy, as if it's moving left to right, you likely have bump steer. Elephant Racing actually claims there is bump steer if the car is lowered by more than 30mm from stock (RS height is 50mm lower than stock and my car is even lower). I just ordered the Elephant Racing bump steer kit, polyeurethane steering rack bushings, and Walrod control arm bushings. I'll report back on how things changed.

craina

What tires and tire pressures are you running?

gmorat

Continental Extreme Sport XL with the recommend pressures which is 36f and 44r.

May it's a little less, certainly depending on the temperature.

G

911F1

I run my Bridgstone RE 71R at 34F and 37R cold. You should try and let some air out. The rear at 44psi probably isn't helping the harsh feeling you're talking about.
But one thing at a time. Adjust your PSS10s first and then if still not happy adjust your tires.