Which square or staggered setup should I go with?

[OrbitalEllipses]

Originally Posted by chanomatik

Yeah was gonna say generally they're significantly thinner.

Yup. Stock spring OD and thus the spring perch are heinously wide. Aftermarket springs are usually around 60mm OD.

[mav1178]

Originally Posted by FM Wheels

What I mean is where there wheel ends up, the space between the mount and the spring perch. I would like to see how 18x9.5 +45 would fit on the front with coil overs.

Look closely at my picture. Where the stock spring perch is vs aftermarket coilovers is virtually the same spot.

I know what you are talking about though; on a S13/14 aftermarket coilovers would give worse clearance vs stock spring/shock. I can assure you that on FRS/BRZ, this is not the case and where the spring perch on the front strut sits is virtually identical to where the aftermarket spring sits, assuming "normal" spring length and shock travel on most off-the-shelf coilover kits.

-alex

[mav1178]

A better example:



This is a stock replacement S13 front shock. If one were running a stock diameter tire (any size), the tire would end up sitting slightly below the spring perch. I've seen someone run a 17x9 +30 R33 GT-R wheel with spring/shock only on a S14 with no fitment issues.

However, look at the same assembly for aftermarket coilovers for S13/14:


The spring is physically smaller, but it is lower and given the same size wheel, you'd have less clearance on the inside.

But this is not an issue with our cars, since the factory spring perch location is same as aftermarket coilovers.

-alex

[King Tut]

Originally Posted by FR-S Matt

I ran 18X9.5 +38 on 245/35/18 with stock suspension for a bit. It was about | | far from hitting the spring with the tire. Any offset higher than that will rub with stock suspension. 100% confirmed. I even low trac'd on hard corners sometimes till I switched to Tarmac 0 coilovers. All problems went away after that and I even feel my handling increased by going a bit lower and wider.

Matt nailed it. Any 9.5" wide wheel with an offset of +40 or higher will most likely need coilovers to guarantee the tire won't rub the spring perch.

[switchlanez]

Suspension clearance shouldn't be an issue as I will have ST coilovers.

18x9.5 +45 w/ 255/35R18 tires seems to be the popular choice in this poll. I've been getting mixed opinions saying 255 will or won't rub the inner fender liner but if I choose a narrower tire (Hankook V12) I should be ok. If clear, would anyone think pushing it to 265 would clear with no fender modifications? @DAMotorsports fit 275 square without rubbing nor fender mods but offset was around 42 or 43 IIRC. Just asking for opinions on clearance, not asking whether it's suitable from a functional aspect (I know when 265 is overkill).

[DAMotorsports]

Originally Posted by switchlanez

Suspension clearance shouldn't be an issue as I will have ST coilovers.

18x9.5 +45 w/ 255/35R18 tires seems to be the popular choice in this poll. I've been getting mixed opinions saying 255 will or won't rub the inner fender liner but if I choose a narrower tire (Hankook V12) I should be ok. If clear, would anyone think pushing it to 265 would clear with no fender modifications? @DAMotorsports fit 275 square without rubbing nor fender mods but offset was around 42 or 43 IIRC. Just asking for opinions on clearance, not asking whether it's suitable from a functional aspect (I know when 265 is overkill).

@desertfrs was running 265/35/28 v12 on his car before going to 275's. He was not rubbing and I believe he was running 18/9.5/+40 but I’ll let him chime in. We chose the widest tire we could due to the overall plan for the car. We started with a +48 and added 6mm spacers putting us around a +42. We daily drive the car with 1.5 camber and 0 toe. Our ride height is 26.5 inches from the ground to the center of the fender.

[Pokeguyjai]

Originally Posted by King Tut

Matt nailed it. Any 9.5" wide wheel with an offset of +40 or higher will most likely need coilovers to guarantee the tire won't rub the spring perch.

Weird I am having rubbing issues when the wheel is fully turned.

I have 245/35/18s on TC105Ns 18x9.5 +35 offset. I have Racecomp Yellows that lower the car 0.8", I plan on installing my Koni Yellows soon but I am guessing those will not have an effect on the ride height.

Any ideas?

[King Tut]

Originally Posted by Pokeguyjai

Weird I am having rubbing issues when the wheel is fully turned.

I have 245/35/18s on TC105Ns 18x9.5 +35 offset. I have Racecomp Yellows that lower the car 0.8", I plan on installing my Koni Yellows soon but I am guessing those will not have an effect on the ride height.

Any ideas?

Those are two different rubs. I am actually surprised you are still rubbing the frame rails with the 245s. My advice is get a smaller width wheel or don't go full lock any more.

[Pokeguyjai]

Originally Posted by King Tut

Those are two different rubs. I am actually surprised you are still rubbing the frame rails with the 245s. My advice is get a smaller width wheel or don't go full lock any more.

Thanks for the advice. I'm going to keep an eye on it to make sure it only happens when I go full lock (I only go full lock when I pull out of my drive way, so at low speeds) I actually feel the wheels shudder when it happen, so it is easily avoidable in the future.

[switchlanez]

Originally Posted by Pokeguyjai

Weird I am having rubbing issues when the wheel is fully turned.

I have 245/35/18s on TC105Ns 18x9.5 +35 offset. I have Racecomp Yellows that lower the car 0.8", I plan on installing my Koni Yellows soon but I am guessing those will not have an effect on the ride height.

Any ideas?

Originally Posted by King Tut

Those are two different rubs. I am actually surprised you are still rubbing the frame rails with the 245s. My advice is get a smaller width wheel or don't go full lock any more.

Are those really the frame rails/inside rubbing? I would think it's outside rubbing due to the low +35 offset with wide 9.5 wheels and possibly wide tire model (MPSS?). Do you have any neg camber dialed in?

[Pokeguyjai]

Originally Posted by switchlanez

Are those really the frame rails/inside rubbing? I would think it's outside rubbing due to the really low +35 offset with wide 9.5 wheels and possibly wide tire model (MPSS?).

Do you have any neg camber dialed in? A ride height lower than what you have now would naturally increase negative camber.

Yeh about -2 degrees of camber dialed in.

Sorry but not really sure what you mean but inside or outside?

[switchlanez]

Originally Posted by Pokeguyjai

Yeh about -2 degrees of camber dialed in.

Sorry but not really sure what you mean but inside or outside?

Inside is rubbing the along the sidewall/shoulder of your tire on your wheel face side, inside is tire rubbing your fender liner or frame rail.

What is your tire model?

[Pokeguyjai]

Originally Posted by switchlanez

Inside is rubbing the along the sidewall/shoulder of your tire on your wheel face side, inside is tire rubbing your fender liner or frame rail.

What is your tire model?

I am guessing you meant inside=sidewall and outside = fender

It is rubbing on the inside, the markings are on the springs and spring perch.

[King Tut]

Originally Posted by Pokeguyjai

I am guessing you meant inside=sidewall and outside = fender

It is rubbing on the inside, the markings are on the springs and spring perch.

I was confused, I thought you meant you are rubbing the frame rails on the inside. I am really surprised you are still rubbing the spring perches. My advice is now to ditch those Yellows and Konis and get some Tarmac Zeros or another coilover with a smaller spring diameter.