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-   -   Any issue running direzza sport z1 star specs 245/265? (https://www.ft86club.com/forums/showthread.php?t=29095)

swift996 02-16-2013 01:06 AM
Any issue running direzza sport z1 star specs 245/265?
 
I have a set of staggered wheels (18x8 +35 and 18x9 +38). I was wondering if I'd have any issue running a 245/40/18 up front and a 265/35/18 in the rear? Looking to get a set of Dunlop Direzza Sport Z1 Star Specs. I will have Eibach R2 coilovers installed.

I know they tend to run a little wider and have a pretty flat sidewall. Is anyone running this set up? Any issue with fit or performance? I'm guessing I'd give up a little steering feel/feedback up front for some additional grip.

swift996 02-19-2013 12:25 PM
Bump...anyone?

D1cker 02-19-2013 12:27 PM
It's going to understeer with staggered tires. From a performance standpoint I'd get the same size wheels front and rear with the same size tire as well. If you love your wheels, I guess you can still run the same size tires front and rear, or just go 255 in the back.

Mach V Dan 02-19-2013 12:32 PM
From experience, those tires are very wide. Based on some test-fitting I've done (HERE), I think the rears may have trouble clearing the fenders. Your +38 offset wheel sticks out 4mm more, plus the tire is wider by a few more mm than the tire I tried.

--Dan
Mach V

swift996 02-19-2013 12:39 PM
Quote:
Originally Posted by D1cker (Post 744137)
It's going to understeer with staggered tires. From a performance standpoint I'd get the same size wheels front and rear with the same size tire as well. If you love your wheels, I guess you can still run the same size tires front and rear, or just go 255 in the back.
I have adjustable sway bars and coilovers which can help me dial out the understeer from the staggered set up. I've ran many staggered set ups in the past with great results. Porsche runs staggered on their GT3 and GT3 Cup. I don't want to list all the others but I'm not worried about it as I'm setting up my suspension with the staggered wheel in mind.

Quote:
Originally Posted by Mach V Dan (Post 744153)
From experience, those tires are very wide. Based on some test-fitting I've done (HERE), I think the rears may have trouble clearing the fenders. Your +38 offset wheel sticks out 4mm more, plus the tire is wider by a few more mm than the tire I tried.

--Dan
Mach V
Thanks Dan, I happened to browse across that the other day. It made me think it probably wouldn't be a good idea to try out given the detail you wrote up.

D1cker 02-19-2013 05:37 PM
Quote:
Originally Posted by swift996 (Post 744178)
I have adjustable sway bars and coilovers which can help me dial out the understeer from the staggered set up. I've ran many staggered set ups in the past with great results. Porsche runs staggered on their GT3 and GT3 Cup. I don't want to list all the others but I'm not worried about it as I'm setting up my suspension with the staggered wheel in mind.



Thanks Dan, I happened to browse across that the other day. It made me think it probably wouldn't be a good idea to try out given the detail you wrote up.
Just because Porsche runs their cars with staggered tires (this was taken into account when designing the car, and the weight balance on a porsche is skewed towards the rear where as our car's weight balance is skewed to the front....) doesn't mean you should do it on your 86.

swift996 02-19-2013 05:49 PM
Quote:
Originally Posted by D1cker (Post 744868)
Just because Porsche runs their cars with staggered tires (this was taken into account when designing the car, and the weight balance on a porsche is skewed towards the rear where as our car's weight balance is skewed to the front....) doesn't mean you should do it on your 86.
I also run staggered on my e46 M3. That's about 50/50 weight distro. Which should "throw off the balance" and put me into a tree...

I plan to go w/ the innovative supercharger kit when available so I want as much rubber out back as I can get without and rubbing or issues.

D1cker 02-19-2013 05:54 PM
Quote:
Originally Posted by swift996 (Post 744907)
I also run staggered on my e46 M3. That's about 50/50 weight distro. Which should "throw off the balance" and put me into a tree...

I plan to go w/ the innovative supercharger kit when available so I want as much rubber out back as I can get without and rubbing or issues.
And that E46 plows at the limit out of the box :)

I can see wanting big rubber out back, but keep it close to the rubber in the front! If you want to have no issues, I would stop at 255 in the back.

swift996 02-19-2013 05:59 PM
Quote:
Originally Posted by D1cker (Post 744918)
And that E46 plows at the limit out of the box :)

I can see wanting big rubber out back, but keep it close to the rubber in the front! If you want to have no issues, I would stop at 255 in the back.
Yeah 255 (rear) seems to be about the max to be safe. I'm just wondering if I should go with a 235 or a 245 up front. I just got my wheels today, they look great.

swift996 02-19-2013 06:27 PM
So if I got 255/35/18 in the rear...

Should I go 245/35/18 or 235/40/18 in the front?

tech4pdx 02-19-2013 06:33 PM
Quote:
Originally Posted by swift996 (Post 744998)
So if I got 255/35/18 in the rear...

Should I go 245/35/18 or 235/40/18 in the front?
On my RT5s, I have 255/35-18 out back and 225/40-18 up front. For me, handling prowess is night n day over stock. Also, the speedo is only off by like 1mph with this setup. No complaints.

Oh yeah.. Running Hankook V12s. Good rubber.

swift996 02-19-2013 06:55 PM
NEVERMIND - Dunlop doesn't even make the fronts in the 245/35/18 fitment. I guess I'll go with the 235/40/18. It makes the front just a smidge taller than the rear but I'll have coilovers.

ZDan 02-19-2013 07:29 PM
Why StarSpecs and not the new Direzza ZII?

swift996 02-19-2013 07:47 PM
Quote:
Originally Posted by ZDan (Post 745134)
Why StarSpecs and not the new Direzza ZII?
I originally thought I could get a deal on the StarSpecs but they are sold out. I plan to go with the ZIIs.


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