Newfound bodyroll with the brz

[wparsons]

Originally Posted by Slammillionaire

No just on the street. They aren't great tires (riken raptor HR), but i feel a lot of sidewall flex that I doubt would be there if they were 215's.

I would bet it's more about the tire choice than width. I've run three different non stock summer tires, all the same size on the same wheels (225/45/17's on 17x8's), and they had very different feel. The Dunlop ZII's are much stiffer sidewalls and had way more immediate turn in than Hankook RS3's, my current Yokohama AD08R's feel more like the ZII's, but like even less pressure hot for optimum grip. The RS3's had a lot more flex and needed more slip angle for max grip.

10mm oversize on the rim isn't going to make a tire go from great feel to crap feel.

[JSube]

Originally Posted by wparsons

I would bet it's more about the tire choice than width. I've run three different non stock summer tires, all the same size on the same wheels (225/45/17's on 17x8's), and they had very different feel. The Dunlop ZII's are much stiffer sidewalls and had way more immediate turn in than Hankook RS3's, my current Yokohama AD08R's feel more like the ZII's, but like even less pressure hot for optimum grip. The RS3's had a lot more flex and needed more slip angle for max grip.

10mm oversize on the rim isn't going to make a tire go from great feel to crap feel.

Yup
"The Raptor HR is RIKEN's H-speed rated Grand Touring All-Season tire developed for the drivers of sedans, coupes, minivans and crossover vehicles."
TR

[JazzleSAURUS]

Originally Posted by Racecomp Engineering

I wouldn't call the MPSS track tires, but it is true the OEM suspension is not designed for them. They're good summer street tires with some decent grip. The OEM tires do not have much grip.

It's always important to build your suspension to match your tire choice.

- Andrew

A million% this.

If you're running a tire like the MPSS the body roll increases drastically.

A setup like RCE yellows/B6's or Koni's, ST's, V1's, or T0's is a better suspension choice for a tire like that, and I find balances really nicely.

I run the S-04 which is within earshot of the MPSS in the dry, a dash better in the wet, and the ST's are matched very well. They have all the grip I could want during spirited driving, and a bit of momentum still lets them slide through a corner when I want to without issue.

[Racecomp Engineering]

Yeah I would recommend a 7.5 or 8 inch wheel for a 225 tire. The MPSS are great for a double duty "light" track tire, or the new Contis. But I'd still think about some basic suspension mods and definitely a more aggressive alignment. 20mm front bar and 16mm rear if you don't want to go too crazy.

- Andrew

[JSube]

Originally Posted by Racecomp Engineering

Yeah I would recommend a 7.5 or 8 inch wheel for a 225 tire. The MPSS are great for a double duty "light" track tire, or the new Contis. But I'd still think about some basic suspension mods and definitely a more aggressive alignment. 20mm front bar and 16mm rear if you don't want to go too crazy.

- Andrew

Thanks Andrew. I just put Hankook R-S4s, for longevity/decent grip, on 17x8 RPF1s for track use. I want to go forward carefully with suspension changes, I think there's a lot of good in the PP17s on the street with the Sachs dampers. I have -2.4 deg. camber up front on plates. I'm on track about 20 days per year, the other 345 it's my daily. Hadn't thought about changing the sways, tho...

[Racecomp Engineering]

Originally Posted by JSube

Thanks Andrew. I just put Hankook R-S4s, for longevity/decent grip, on 17x8 RPF1s for track use. I want to go forward carefully with suspension changes, I think there's a lot of good in the PP17s on the street with the Sachs dampers. I have -2.4 deg. camber up front on plates. I'm on track about 20 days per year, the other 345 it's my daily. Hadn't thought about changing the sways, tho...

Yeah I think you're on a good path and going forward carefully is the right way to go. Mild swaybars (20mm/16mm) is a good simple way to reduce roll and our RCE Yellows are a mild spring that is still a noticeable improvement and they work well with good summer street tires.

That's a lot of track days, so a few key suspension mods would help.

- andrew