Sway bars for 2017 stock suspension
 

I want to improve my brz handling and wonder if some one here tried to put some sway bar on the 2017 stock suspension.
What the effect will be?
I want to get sharper handling, less body roll and better turn in.
I saw that they are a lot of types, solid/ hollow, different sizes, etc.
I will be very happy you know which one of them specificly can give me the best handling improvment to my stock brz (I dont want to lower my car).
Thank u!

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#1 mod: alignment, specifically getting negative camber up front! It makes a huge difference in how responsive the steering is. For street use, -2.5 front, -2 rear is a nice place to be. You can't change the back easily, but the front can be done just with bolts.

#2 mod is going to be tires.

I'm sure there are opinions all over about how magical and amazing this or that setup might be, but increasing roll stiffness without a proper alignment or tires is going to change how it feels, but probably won't actually improve much. In fact, I'd recommend springs before swaybars - get the car a little lower and a bit more stiffly sprung before fiddling with sways - unless that's simply not an option for you.

Yes sway bars will make the car roll less and yield better turn in...

But it really depends on what tire you're planning to run. On stock tires, any sway bar upgrade is likely going to overwork the tires and actually make you slower and have less grip. Hollow sways have the benefit of being lighter, but not as stiff. Solid sways have the benefit of being stiffer, yet heavier. For street driving you could probably get away with hollow sways, but pair it with better tires.

As you increase the stiffness of your suspension you should get stickier tires to accommodate the stiffness.

First of all,thank u for answering.
Second, i forgot to mention that i already have better tires (michelin ps4) and i think to improve them even better to yoko AD08R.
Wich roll bar (front/ back) will be good for me? I want the best improvment, that reduce bodyroll the most and will make the car sharp the most but without overkill the setup..

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My car is a 2015 so you would have to check to see if these fit. But I'm using Eibach sway bars, Cusco Zero 3R coil overs, 10K front, 12K rear, and my car has never handled better.

I can consider lowering springs too if it will low the car a little bit and will improve the performance and handling better than the sway bars..

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I'd still say alignment first. Getting some negative camber into the front makes a huge difference.

Otherwise as you add wheel rate it may just exacerbate the lack of front grip.

C

What about the bodyroll with the alignment?
If i go withe springs, whic recommended?
The spring after the 2017 facelift are the same as before?
It will be a compermise for me but if i will find springs that will not low the car too much, and the ride quality will be ok, i can handle it if it improve performance and reduce body roll better than the alternatives.
I heard about alingment before but never as something that can reduce bodyroll for example..

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Before I went with coil overs I tried H&R Super Sport springs. I really liked them but couldn't get enough front camber, so eventually went with coil overs.

What's the problem with body roll?

You say you want to improve turn in. In what way? Are you driving on tracks, autocross or street? Since you drive a brz and not an FRS I'm guessing that you want to reduce understeer a bit. Adding neg camber to the front as previously mentioned and a slightly bigger rear bar will help, say a 16mm. Get one thats adjustable

Body roll is quite low on this car overall already - it's a useful metric, perhaps, when analyzing the effect of a change. Compare to the ND Miata and you'll see (potentially) very similar track times, but a huge difference in body roll... the trade off is that the Miata handles rough track better.

Alignment, specifically negative camber in the front, is going to significantly improve turn-in and response.

Start here: http://www.ft86club.com/forums/showthread.php?t=25001

You can get -2° or more using the SPC bolt in the top and the top factory bolt in the bottom (I believe that's the trick setup...) - spring perch clearance is the limiting factor here - you do not want it rubbing on the tire, and you need room for the tire to deform and still not rub. I'd go the bolt route (over a cas/cam plate at the top of the front struts) to maintain a more comfortable ride.

I wouldn't worry too much about rear camber unless you're competing in some way, in which case we should evaluate your needs from the top. There is already a reasonable amount of negative camber from the factory, and the multi-link behaves better than the front strut setup. If you're the type that needs it perfect, an adjustable lower control arm is the way to go to get control over rear camber. Note that camber and toe both change together, so it's a bit miserable (in my opinion).

I'm curious about why springs are a compromise for you. Every suspension change is a compromise of some sort...

I drive the car for daily, track and in mountain roads. I want from the car to feel better, yesterday i was on the track, and find the body roll make me harder to go back from drift smoothly. I want flat feel under weight transfer, and to make the car more relevant and fun on the track. I want the fun and feels, the drama and a bit more oversteer more than times and speed. To get this i thought to pick some good and qualified springs (bit stiffer at tge rear) that good to work with stock shocks because i dont want to pay for coilovers right now.
Springs are comprmise for me because as daily drive i find it better to drive higher car...
Thanks for all comments, if u think springs are tge solution for me i will ve happy to hear which specificly
For the alignment, if i will go with -2 camber before and leave the rear stock it will work good together?

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The rear bar on a 2017 car is already 16mm.

I would go with a slightly larger front bar on a totally stock car, personally.