Loose Steering Help

[Jozy]

What up everyone!

I need a some guidance on a what I think is a steering issue. I have a 2015 Brz with 79k miles. To start here are the parts I've changed out so far regarding steering & handling

All 4 shocks replaced with a 2017 BRZ that had about 20k miles on them
All front lower control arm bushings changed with whiteline and megan racing, the ball joint is oem replacement.
Inner and outer tie rods changed with Bosch replacement from Oreilly
Front end links changed with Perrin Polyurethane ones.
I also changed out the EPS coupler mine was completely destroyed.
I'm also running the Hankook Ventus V12 about 8k miles old

Overall it handle much better than what it was and I feel planted but idk if it's placebo but the car feels a bit loose it's very easy for it to sway left or right while at higher speed and there's a good amount of body roll but I do know body roll isn't necessarily a bad thing.
Basically I'd just like to know if there's something else that could be causing loose steering that I missed?

I was thinking maybe I could try the STI long bolts for the steering rack with the whiteline bushings or if maybe I just need to upgrade both sway bars. I'm trying to go for a heavier steering feel that's the best I can explain it. What yall got?

[Airwolf]

Hi,
what are your cold tire pressures? what is your actual wheel alignment setup(toe&camber,front&rear)? are your rear control arms bushings ok?
...front to rear tire pressure distribution changes steering weight.
...front toe changes on center steering feel.
...excessive rear toe-out can cause rear end weaving and reduced reactions to steering inputs.
...not optimal camber and toe values (understeer prone) can enlarge the body roll.

One owner of Ventus V12 on tyrereviews.com (driving older Type R) mentioned lack of feedback on the front, and weaving on the back. So it could be also caused by your tires. Try possibly e.g.Continentals (or Yokohamas), they usually have more precise steering.

STI long bolts with the whiteline steering rack bushings will help with steering feel. Easier to fit are Perrin steering rack locks, will bring yet more feel, but also slight NVH to steering on bumpy roads.

Sway bars upgrade will help with body roll, but not with the heaviness of steering feel. (and requires dampers and end-links in good condition. Stiffer sway bars may also overwhelm the softer sidewalls of Ventus tires on quick direction changes.)

[Spuds]

OP, please describe "loose" a bit better. Is there a dead spot at the top of the steering wheel where you turn the wheel and nothing happens? Or is the car darty when holding the steering wheel straight? Or does the steering wheel pull to one side or the other while driving?

If you haven't had an alignment, go do that first. Wheel alignment is very sensitive, so even replacing bushings will throw it off.

[norcalpb]

Originally Posted by Jozy

What up everyone!

I need a some guidance on a what I think is a steering issue. I have a 2015 Brz with 79k miles. To start here are the parts I've changed out so far regarding steering & handling

All 4 shocks replaced with a 2017 BRZ that had about 20k miles on them
All front lower control arm bushings changed with whiteline and megan racing, the ball joint is oem replacement.
Inner and outer tie rods changed with Bosch replacement from Oreilly
Front end links changed with Perrin Polyurethane ones.
I also changed out the EPS coupler mine was completely destroyed.
I'm also running the Hankook Ventus V12 about 8k miles old

Overall it handle much better than what it was and I feel planted but idk if it's placebo but the car feels a bit loose it's very easy for it to sway left or right while at higher speed and there's a good amount of body roll but I do know body roll isn't necessarily a bad thing.
Basically I'd just like to know if there's something else that could be causing loose steering that I missed?

I was thinking maybe I could try the STI long bolts for the steering rack with the whiteline bushings or if maybe I just need to upgrade both sway bars. I'm trying to go for a heavier steering feel that's the best I can explain it. What yall got?

May not be related to your issue, but I'm not a fan of those Perrin poly front end links at all. IMO there is no way that 80a durometer conical "longboard" bushings can articulate as well as a ball joint.

And if it does, the transfer of force will press out the bushing, and in turn shove its support bolt into your inner fender liner causing cosmetic damage.