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Wow, 255 (vs stock 235) on ½" wider rims and it still didn't help your understeer? I'm assuming you've already maxed-out the negative camber available with the stock suspension, so I guess LCAs or camber plates would be the next thing to look at.

I'm wondering how much of this is related to driving style and/or tire, too. I trail brake extensively and find RE-71Rs in stock widths to be nicely balanced once I maxed-out the negative camber.
 

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Wow, 255 (vs stock 235) on ½" wider rims and it still didn't help your understeer? I'm assuming you've already maxed-out the negative camber available with the stock suspension, so I guess LCAs or camber plates would be the next thing to look at.

I'm wondering how much of this is related to driving style and/or tire, too. I trail brake extensively and find RE-71Rs in stock widths to be nicely balanced once I maxed-out the negative camber.
I would look at an adjustable rear bar. I installed one and its made a massive difference on the cars balance.

David
 

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Discussion Starter · #25 ·
I’m on a set of titan S5s, so 18/35/255 and 285. Also since I know you’re in Austin from a different thread, are you tracking your car in town? I’ll be at the edge event on the 12th.
I've ran at COTA a few times with PCA. I won't have tires and inspection in time to make the edge event, unfortunately. My current contract is up this week and I just got an offer on my next gig so I had to hold off on big purchases until I knew I'd have something else. Hopefully someone runs COTA in January.

Looks like a lot of people run 18s instead of 19s and find tires much easier that way. It sorta seems I'm stuck with the RE-71s for now unless I move up to the Cup 2s which I am not sure are going to hold up any better.
 

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Discussion Starter · #26 ·
Oh I forgot to say that I get them from Price Cobb/tire rack. He’s awesome and will deliver them to your house. Former les mannes winner, very cool dude. Happy to send his contact info your way.
I've ordered from Price before, and will probably do so again :)
 

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I just used the stock Goodyear Eagle F1 Asymmetric 2 20" and noticed I had to replace them after the first year at the track (3 events over 6 days) with all stock settings. I think the biggest factor is how hard you push your and your car's limits to determine expected wear.
 

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I've ran at COTA a few times with PCA. I won't have tires and inspection in time to make the edge event, unfortunately. My current contract is up this week and I just got an offer on my next gig so I had to hold off on big purchases until I knew I'd have something else. Hopefully someone runs COTA in January.

Looks like a lot of people run 18s instead of 19s and find tires much easier that way. It sorta seems I'm stuck with the RE-71s for now unless I move up to the Cup 2s which I am not sure are going to hold up any better.
Chin has an event on Jan 30th. :). I’ll be there.
 

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From some research I've done,

-If you want to stick with 19" track wheels, most aggressive I've seen is a 19x9 and 19x10.5 with 265/35-19 and 285/35-19 RE-71R, especially the GT4 crowd. Yes you can go 19x11 in the rear with around +45-50mm offsets, but there's not really any tire choices available to keep a similar diameter.

-If you want to go with 18" track wheels, lots of peeps are using 18x9 and 18x10-11 with 245-255/35-40 front tires, which have more tires available. As for the rear, choices are still quite good with 275-295s.

If the track you are running does not have much straightaways, dropping to a 35 series tires is a good way to go especially since your acceleration is increased.

Also, if your budget allows, I would suggest getting custom spec wheels like 18x9.5 and 18x10.5 to run Yokohama A052s in the size of 255/275. (Yes, a 9.5" width wheel can fit the front if you have around -3.0* of camber using top hats and control arms)
 

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-If you want to stick with 19" track wheels, most aggressive I've seen is a 19x9 and 19x10.5 with 265/35-19 and 285/35-19 RE-71R, especially the GT4 crowd. Yes you can go 19x11 in the rear with around +45-50mm offsets, but there's not really any tire choices available to keep a similar diameter.
GT4 Tires
  • APEX Staff Pick:Front: 265/35-19 // Rear: 295/35-19
    • Availability:
      • Max Performance Summer: Michelin PS4S (300 TW)
      • R-compound: Michelin Cup 2 (180 TW)
      • Semi-Slick: Hoosier R7 (40 TW)
  • Alternative:Front: 265/35-19 // Rear: 295/30-19
    • Availability:
      • Max Performance Summer: Michelin PS4S (300 TW)
      • Extreme Summer Tires: Yokohama AD08R (200 TW), Goodyear Supercar 3 (220 TW)
      • R-compound: Pirelli Trofeo R (60 TW)
      • Semi-Slick: Hoosier R7 & A7 (40 TW)
  • Alternative 2:Front: 255/35-19 // Rear: 305/30-19
    • Availability:
      • Max Performance Summer: Michelin PS4S (300 TW), Bridgestone S-04 PP (280 TW), Continental ExtremeContact Sport (340 TW), Hankook V12 EVO2 (320 TW)
      • Extreme Summer Tires: Bridgestone RE-71R (200 TW), Yokohama AD08R (200 TW)
      • R-compound: Michelin Cup 2 (180 TW)
  • Alternative 3:Front: 265/35-19 // Rear: 305/30-19
    • Availability:
      • Max Performance Summer: Michelin PS4S (300 TW)
      • Extreme Summer Tires: Bridgestone RE-71R (200 TW), Yokohama AD08R (200 TW), Goodyear Supercar 3 (220 TW)
      • R-compound: Toyo R888R (100 TW), Michelin Pilot Sport Cup 2 (180 TW), Pirelli Trofeo R (60 TW), Nankang AR-1 (100 TW)
 

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Hence, I said if people wanted to keep the similar diameter, only 285-295/35 sizes are available as track tires

GT4 Tires
  • APEX Staff Pick:Front: 265/35-19 // Rear: 295/35-19
    • Availability:
      • Max Performance Summer: Michelin PS4S (300 TW)
      • R-compound: Michelin Cup 2 (180 TW)
      • Semi-Slick: Hoosier R7 (40 TW)
  • Alternative:Front: 265/35-19 // Rear: 295/30-19
    • Availability:
      • Max Performance Summer: Michelin PS4S (300 TW)
      • Extreme Summer Tires: Yokohama AD08R (200 TW), Goodyear Supercar 3 (220 TW)
      • R-compound: Pirelli Trofeo R (60 TW)
      • Semi-Slick: Hoosier R7 & A7 (40 TW)
  • Alternative 2:Front: 255/35-19 // Rear: 305/30-19
    • Availability:
      • Max Performance Summer: Michelin PS4S (300 TW), Bridgestone S-04 PP (280 TW), Continental ExtremeContact Sport (340 TW), Hankook V12 EVO2 (320 TW)
      • Extreme Summer Tires: Bridgestone RE-71R (200 TW), Yokohama AD08R (200 TW)
      • R-compound: Michelin Cup 2 (180 TW)
  • Alternative 3:Front: 265/35-19 // Rear: 305/30-19
    • Availability:
      • Max Performance Summer: Michelin PS4S (300 TW)
      • Extreme Summer Tires: Bridgestone RE-71R (200 TW), Yokohama AD08R (200 TW), Goodyear Supercar 3 (220 TW)
      • R-compound: Toyo R888R (100 TW), Michelin Pilot Sport Cup 2 (180 TW), Pirelli Trofeo R (60 TW), Nankang AR-1 (100 TW)
 

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Alternative 3 looks like some good options to choose from.

Those Hosier A7/R7 look very nice/fast but maybe a little too aggressive for a street car? Anyone tried them?
The Hoosiers are extremely fast, but they're not street tires. They're slicks, and if they're even road legal in a given jurisdiction, it's only a formality. I wouldn't even want to drive to/from an event on them; I'd either trailer the car, or change out tires at the track.
 

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Discussion Starter · #35 ·
Well looks like I'm a little screwed. I have an event in 2 weeks and it appears the RE-71Rs are no longer available in 255/35/19. Dammit.

Not a lot of other options available in the 19s fitment.
 

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I read about that with the RE-71Rs.

What about the Nakang AR-1? you could go up to 265/35ZR19 or 245/35ZR19 and maybe you could squeeze that 305/30ZR19 on the back or there is a 275/35ZR19

I read that some of the GT3 guys were impressed with the times on the Nakang.
 

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My track wheels are OZ Racing Alleggerita HLT (18"), so I'm also running 255/35R18 and 285/35R18,
I’m on a set of titan S5s, so 18/35/255 and 285. Also since I know you’re in Austin from a different thread, are you tracking your car in town? I’ll be at the edge event on the 12th.
Do you happen to know what rim widths &/or offsets your front and rear 18" rims are? Thanks
 

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FWIW, I ran 18" APEX SM-10s in satin black on my GTS with RE-71Rs and thought they were awesome. 18x8.5" ET42 in the front, 18x10.0" ET36 in the rear. Now that I have a GT4 that requires 19" wheels, I'll be selling the 18" set as soon as I can get some pictures to make a proper ad.
 

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FWIW, I ran 18" APEX SM-10s in satin black on my GTS with RE-71Rs and thought they were awesome. 18x8.5" ET42 in the front, 18x10.0" ET36 in the rear. Now that I have a GT4 that requires 19" wheels, I'll be selling the 18" set as soon as I can get some pictures to make a proper ad.
Thanks Sobiloff, I am subscribed to the new APEX 19" wheel group purchase. IIRC, for the GTS customers in the group buy, I believe the 19" Wheel set(s) I'm getting for my car are setup for the GTS & may use a different offset than the GT4, particularly for the GT4's, both 981 & 718/982 variant's standard 11" rear rim width.

FWIW, I believe I have a legacy set of 18" BBS RS-GT forged rims left over from my former 987 Cayman - have to dig them out and check the rim widths. If the 18" rims will fit over the existing 718 GTS brakes & (?) hopefully the larger GiroDisk 350mm front rotors, if I end up needing to go that way, it sounds like having 18" rims offer a lot more track suitable tire options.

I am assuming the new GT4 requires a move up from 18" to a minimum of 19" to clear larger brakes?

Best, Mike
 
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