Some thoughts after upgraded tires
 

Don't know if body-roll is the right term here, in short, the entire sideway action feels much more natural with the stock tires on. Whenever you break the traction entering a corner the car just slides more naturally. However, when I upgraded the tires to the Michelin PPS, sometimes it feels like even though the chassis wants to break away, the tires are holding it back. As a result It's sort of all over the place.

Anybody has any similar thoughts?

consider the compound stickiness between the two and you have your answer.

also sidewall stiffness.

It's just the normal result of increasing tire grip levels without making any other changes to the suspension. Where your tires would break loose before there was much body roll before, now they grip harder and body roll/suspension compression is the result.

So, go stiffer on the suspension to work better with the grippier tires? I have a set of sticky as a stalker chic Advans ready to bolt onto my BRZ when it arrives so

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This is the first review I've read or heard that was disappointed in the upgrade. R&T, Consumer Reports, Tirerack and everyone else said that this is the first thing they would do if they had one of the twins.

not sure why... i love my stock tire feel. they have the right amount of grip for me at least while i drive through canyons and hard turns. never had a slip problem or lack of grip.

The car is fun to throw around on stock tires of course, but if you stiffen up the suspension it'll be more entertaining with sticky tires. It'll grip of course more than anything, you wont really be able to slide around as much until you start adding on power, but without a nice stiffened suspension it wont be as entertaining as it was before.

:lol::lol::lol::lol:

this is exactly why manufacturers match the spring rate to tire grip. As people mentioned before in this thread, you will enjoy it more when you upgrade to stiffer suspension to compensate for the added grip. I am experiencing the same with 245/35/18 michelin PSS but it will be remedied with a nice set of coilovers :party0030:

I did PSS tires and immediately felt a huge difference. Suddenly a tight 120 degree turn next to a guardrail didn't have me worried. (stock tires felt like they might slip there, the PSS are planted.)

I've been amazing at the cornering speed these PSS can take without breaking traction! Car feels great to me - maybe you're either not turning smoothly enough or not used to the higher g's you can now pull in corners. Took a right hander recently that I figured would definitely get the car loose - front or back... something! It gripped and never slipped - really blew me away. But now I realize I probably can't find that point of traction loss on dry pavement without going crazy fast. The stock tires would lose grip and squeal like a pig at such low speeds, it was very predictable to drive with the back end loose around turns.

Oh - had to swerve doing 70+ mph on highway bc something was in my lane (obstructed view from car in front till I was nearly hitting it). I jerked the wheel to the right, shifted the car within its lane about 2' over, and was seriously impressed with again just how planted the car was. Suspension felt great - didn't lean etc - car reacted beautifully without drama.

I am not exactly disappointed, the grip is great when you try to go fast. But since everybody is saying how necessary the tire upgrade is, I just wanted to provide some different thoughts. It's one of those the car would be better in certain ways if it's worse kind of situation.

I could still throw my car around like it was on prius tires on 255 wide Z2s last year without any power mods.

Its all in how you drive your car.

I guess the point I am trying to make is that for most people, choosing a direction of mods is really important. What do you want out of this car. Sideways fun? Speed? Rice? Again, I not disappointed with the added grip, I just wasn't sure what to expect until I get used to the new feel.

A lot of people think that the making of a stock car is just all sorts of compromises and any aftermarket parts will make it better. For those people, maybe obnoxious exhaust, subwoofer, led lights and tons of body kits is the way.

Are you on stock wheels or did you opt for a wider wheel? What size mpss are you running?

Stock wheels. Stock size, 17 inch

How long have you had the tires? It takes a few hundred miles for the new tires to break in. Been autoXing and tracked one time with the PSS and thought them to be fairly progressive. Way better on the streets with PSS. Never had a chance to autox or track with OEM since they were destroyed by a pothole.

Modify the suspension and you'll be fine. The changes ideally should be done together, money allowing. After a ton of research I'm going with the hotchkis Stage 1 tvs suspension kit and Enkei RFP1s in a 17x7.5 size with Conti ExtremeContact DWs in a 225 width. It'll be the best setup for a summer DD/track toy and as an added bonus sizes and positions the wheels so they look like they actually belong on the car haha

OK , I'm calling BS on this. You must be Aryton Senna.

I am not new, and not a 20 something.

I have added more than 100bhp to the stock setup on my BRZ.

You simply cannot substitute tires and call yourself an expert. Not even if you are Louis Hamilton! This car has NO power.

Oh my God, did you just jump into a perfectly nice thread discussing tires and piss all over it with that "moar powa" bullshit? Seriously?

OP, your take on mods is spot on. Especially with this platform, everything is already amazingly well balanced/tuned. A sure-fire way to destroy that is to take a whole bunch of shiny parts and throw them onto the car all at once. Poof! Disaster.

If you really want it, one small change at a time. Save your old parts. Maybe the change isn't what you wanted.

I'm happy with the tires as well. Stock wheels are great. I'll probably get the PSS when the time comes just because of all the buzz but, yeah, I bet I'll feel exactly the way you did.

I can slide my Z2's with no power changes as well, it ain't rocket science it's just understanding and controlling your inputs to the car: steering throttle brake & clutch.

It's not an 'at will' thing you can do by stomping your foot on the floor, you have to either try to do it or make a mistake for it to happen.

You must have a very large expensive paperweight.

Honestly, I was impressed with the road holding abilities of the prius tires. During my spirited test drive I never felt it get squirelly even with the traction control killed. My purchase of super sticky tires is only to wrap something around the new wheels. The stock wheels are fugly.

Hey, ouch.