Tire recommendation for HPDE

[o-man]

https://www.usaa.com/inet/wc/vehicl...archRanking=1&SearchLinkPhrase=goodyear tires

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[wingnutt]

Found it!

 

[Tellme]

https://www.tirerack.com/tires/tire...R9F1S3XL&vehicleSearch=false&fromCompare1=yes

maaaaaaannnn u da real mvp. Bless your heart.

 

[EFI]

Firestone firehawk indy 500 FT(cheap)W

There's a reason they are cheap, cuz they are garbage on the track and should only be used for parade laps. A Federal 595RS-PRO is $75 cheaper per tire and will run circles around it. Only downside of the Federal is they don't come in big sizes, but even a 275 will have better grip both straight line and lateral than a 325 Indy.

 

[c_reber]

GY SC3 FTW! What size did you go with Wingnutt?

 

[DickR]

https://www.usaa.com/inet/wc/vehicle-maintenance-center?SearchRanking=1&SearchLinkPhrase=goodyear tires

Per the footnotes it appears the tires have to be purchased from GY.com and installed at a GY tire store or independent "authorized" dealer rather than "just any" independent installer. Has anyone tried an installer such as Discount Tire and if so did you get "free shipping"? I haven't joined USAA so far but am a vet so I can do so if needed. Since I'm not a member I cannot "walk through" the process to see what the options are for installers and free delivery. FYI my application would be a stock (FS) autocross 2018 Mustang GT PP1 which gets driven to/from events. It appears the SC3's are not quite as quick as the Falken RT-660's or now available Yok A052's but might have other advantages such as not "aging out" if I don't wear them out in one season of occasional autocrosses.

Thanks


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[shogun32]

Per the footnotes it appears the tires have to be purchased from GY.com and installed at a GY tire store or independent "authorized" dealer

you BUY them thru GY.com. And they will ship to a GY branded or affiliated tire shop. You then march in and pick up your loose tires and do as you see fit. You will not get the $60 install fee back but who cares...

 

[hlh1]

I've read through this entire thread and learned much from you all. Last Saturday I had my first real track experience at VIR and had a blast with my stock 19 GT PP1 with the PS4s. I ran in the Green class and this setup was perfect for my novice experience. And yes, I now have have the bug...

I have two sets of stock PP1 wheels; 4 19x9" fronts and 4 19x9.5 rears. I'd like to go square for rotational purposes and maybe to prevent under steer. Currently I have the 255x40x19 PS4 fronts and 275x40x19 PS4 rears. To go square I'm thinking I would use the 4 19x9.5 wheels for the track with 4 275x40x19 tires? Or would I need to go with 4 285x35x19 tires? Would I need spacers? I'd rather avoid spacers I think.

I'm thinking I would then use the 4 9x19 wheels for daily use with 275x40x19 tires? Or do I need 275x35x19 tires? Again, would I need spacers that I'd like to avoid?

I wonder if I go with lower ratio tires, 35s, would this change my speedometer readings?

thanks in advance.

 

[bnightstar]

I'm thinking I would then use the 4 9x19 wheels for daily use with 275x40x19 tires? Or do I need 275x35x19 tires? Again, would I need spacers that I'd like to avoid?

I wonder if I go with lower ratio tires, 35s, would this change my speedometer readings?

thanks in advance.

If you want to put 9.5 PP wheel upfront you need 5 mm spacer to do so. I wouldn't use spacers. Also PP wheels are really heavy. I suggest you sell one set of them and go buy something in 19x10 from LMR or Apex or somewhere else you need 19x10 et40 for a square setup with 285/35/19.

I currently run 275/35/19 on the oem 19x9 front PP wheel and it works great I run 275/35/19 rear the speedometer readings change but you can correct that with Forscan so the car know you are on 35 tires and correct everything.

So if I were you I would sell one PP set and buy 19x10 wheels to go 285/35/19 square or 295/30/19 square however the 285 will be ideal.

I personally only have 1 set at the moment but once Apex 19x11 wheels become available again I'm going to buy Apex SM-10 19x11 ET26 Fronts, 19x11 ET52 rear I don't mind rotating tires via mounting but I mind having extended studs or spacers.

 

[Norm Peterson]

I've read through this entire thread and learned much from you all. Last Saturday I had my first real track experience at VIR and had a blast with my stock 19 GT PP1 with the PS4s. I ran in the Green class and this setup was perfect for my novice experience. And yes, I now have have the bug...

Given that last thought, I'd give some thought to getting a whole new set of 10" or possibly 11" wide wheels for your normal track use and keeping the wheels and tires that you have now as your dedicated street setup/use as emergency track day spares.

No reason any first set of 275/xx, 285/xx, or wider "track tires" couldn't be swapped onto the car at home as long as you stick with a true street tire like the PS4S.


Norm

 

[Grintch]

If you want to put 9.5 PP wheel upfront you need 5 mm spacer to do so. I wouldn't use spacers. Also PP wheels are really heavy. I suggest you sell one set of them and go buy something in 19x10 from LMR or Apex or somewhere else you need 19x10 et40 for a square setup with 285/35/19.

I currently run 275/35/19 on the oem 19x9 front PP wheel and it works great I run 275/35/19 rear the speedometer readings change but you can correct that with Forscan so the car know you are on 35 tires and correct everything.

So if I were you I would sell one PP set and buy 19x10 wheels to go 285/35/19 square or 295/30/19 square however the 285 will be ideal.

I personally only have 1 set at the moment but once Apex 19x11 wheels become available again I'm going to buy Apex SM-10 19x11 ET26 Fronts, 19x11 ET52 rear I don't mind rotating tires via mounting but I mind having extended studs or spacers.

I agree with the stock wheels are heavy comment, making the 19x9.5 PP rear wheels all around not a great choice. Technically 285's will fit them, I would stick with 275 for 9.5 for track use. And you will need a spacer, as noted above.

19x10 et40 can still need a spacer with wider 285's. So if you want to avoid spacers go et35. But et35 on the rear is borderline pokey with wider 285s.

Personally, a true square setup is very helpful in getting good life out of the tires by being able to rotate tires front to rear. While I am not a fan of running (bolt through) spacers when they can be avoided, in the case of running 11's on the Mustang, I think it is worthwhile. Avoid bolt on spacers though.

 

[hlh1]

Backwards from what I was originally thinking, it sounds like I should use the 9 inch stock wheels and a 275/35/19 tire to go square and this avoids using a spacer.

Or, I could use the 9.5 inch wheels square and go with 275/35/19 tires and a 5mm bolt through spacer in front.

I think I'll stay with these wheels this year and if all goes well sell/trade/buy a lighter set next year if this year goes well.

I have used Forscan and can make the speedometer changes.

 

[shogun32]

Or, I could use the 9.5 inch wheels square and go with 275/35/19 tires and a 5mm bolt through spacer in front.

your best course of action really. Sure the wheels are heavy. But it doesn't matter.

 

[hlh1]

your best course of action really. Sure the wheels are heavy. But it doesn't matter.

For my novice status heavy wheels are not an issue, I don't think. My street tires will need to be the same 275/35/19 ratio, on the 9 inch rims, for the speedometer.

 

[Norm Peterson]

For my novice status heavy wheels are not an issue, I don't think. My street tires will need to be the same 275/35/19 ratio, on the 9 inch rims, for the speedometer.

Even with experience, heavy wheels aren't going to cost you as much autocross run time or HPDE lap time as most people seem to think.

5 lbs per wheel times 4 on a Mazda Miata only cost about 0.1 second on a 40-ish second autocross course. This ran in a feature in the SCCA magazine a few years back.

10 lbs/wheel times 4 on a 3600-ish lb Mustang shouldn't even cost you a whole tenth on a quarter mile dragstrip.

You're never going to feel the difference at untimed HPDE, and you'd be hard-pressed to separate any wheel weight effect out from the normal scatter in lap times even with in-car datalogging.


Norm

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