Which R-comps for Auto-X?

[ozmdd]

Couple of things:

R-comps on a stock Yaris are going to get shredded on the outside edge, and are a real risk for rollovers, due to the high COG and extreme grip.

Kumho V710's and Hoosier A6 are top-notch autocross R-comp tires.

dunlop Star-Specs and Kumho XS are excellent, affordable and durable "Street" tires, very popular in ST-based classes. The Bridgestone RE11 is also getting a lot of love from people who ran at Nationals in Lincoln (concrete) last fall. All three are tires you could easily use as daily-drivers in most non-snowy parts of the country and get 10-15K miles, even with occasional autocross use, so you save $$ on new wheels.

As for the Rear sway bar, there has been some debate about it being legal for the Yaris in HS. Jason may have better info than I do based on his experience, but I did email the rules representative at the SCCA national office, and he interpreted the rules in favor of the TRD RSB, because it is officially listed as a port option for Toyota Yaris with a corresponding part number. FYI.

IMHO, your car is not going to be able to take advantage of the R-comps as it it currently prepared. Try something in a street tire and see how you do, then consider what prepartion you'd eventually like to do to your car.

One other thing- tirerack.com has a $50 rebate on Dunlop Star-spec's for the next month!!

[Jason@SportsCar]

Originally Posted by ozmdd

As for the Rear sway bar, there has been some debate about it being legal for the Yaris in HS. Jason may have better info than I do based on his experience, but I did email the rules representative at the SCCA national office, and he interpreted the rules in favor of the TRD RSB, because it is officially listed as a port option for Toyota Yaris with a corresponding part number. FYI.

Yes, the port installed stuff is OK - SCCA considers the port to be an extension of the factory. Most of the time you can spot the dealer VS port installed options by reading the fine print. If it says installation charges apply and vary by dealer, it is typically dealer installed and not legal.

Just for fun I went on and "built" a 2010 with a bunch of TRD parts.

Sport Muffler and rear swaybar come up as installed by the manufacturer - should be legal.
Clutch, CAI, springs, rad cap and shift knob are listed as installation not included, see your local dealer - would not be legal.

Keep in mind the TRD rear bar under the Port installed allowance does not mean you had to order it with your car or have the port install it, you can do it yourself after the fact. But this allowance does not allow the use of an aftermarket rear bar, even if it appears "identical". You must use the TRD part to be legal.

[cali yaris]

how about OEM TRD bushings/motor mounts/trans mount/etc that are Toyota parts from Japan, like the ones I sell?

How do those fit into SCCA's classing scheme?

[Jason@SportsCar]

Originally Posted by cali yaris

how about OEM TRD bushings/motor mounts/trans mount/etc that are Toyota parts from Japan, like the ones I sell?

How do those fit into SCCA's classing scheme?

For stock class those parts are not legal regardless of who makes them, there is no allowance for replacing them.

I am not familiar with your JDM parts, but ST and up allow for replacement bushings, motor and trans mounts. However, they must attach to the OE locations, and can not have more metal content than the OE part. So harder rubber, poly and delrin are ok, also long as the metal content (sleeve/tube) is not great than stock. If you have more metal content, or use bearings, you would be in Prep or Mod.

[cali yaris]

ok cool - the TRD mounts and bushings use harder rubber.

Here is the TRD trans mount: