You can't. Well, at least not directly.

 

ASP is looking better and better?

 

A couple of STU set-up questions.

What tires were run at Nationals? I noticed they mostly said Dunlops with the asterisk indicating multiple manufacturers were used. I'm guessing RS3's? Was it the temps or the course that resulted in the tire changes?

Also, are the lightweight Girodisc brake rotors allowed in STU? What about the Whiteline tie rod ends from their roll center kit? Thanks!

 

I'll try to answer your questions.

- AFAIK, all the top STU cars were on Dunlops all week, except one who was down in the trophies on RS3s.

- The super light Girodisc rotors were ruled illegal. The SCCA changed the rule to require the disc wall thickness to be within stock? specs. But the standard alum hat Girodisc rotors are ok.

- I don't believe there is any allowance for changing the rod ends.

Rick

 

Rick, thanks for the response. Too bad about the rotors but on the bright side, saves me ~$1500.

On the tires I was just wondering since almost all the top cars had asterisks next to their tires. Thanks again!

 

Those asterisks are not reliable

 

No prob, I've been in STU so long I've forgotten more than I know!

Yeah, not sure what the deal was with how the asterisks where handled.

 

Bump.. is there a thread with the exact list of what mods are okay for the STU class?

 

The first post has links back to a lot of the other STU threads. There's also the solo rulebook.

Really short version:
-intake up to the turbo inlet; exhaust starting at the O2 housing
-tune is okay but can't touch the boost tables or otherwise mechancially alter boost
-struts/springs/camber plates/swaybars open
-any width wheel but only 245 max width tire

Makes for an awfully fun street car even without the nuclear power that most EvoM folks have.

 

Requires a cat (can go to a high flow) to remain in basically stock location though.

(John I know this was the really short version, just adding that caveat as most EVOs around our region have gone the test pipe route, obviously not STU legal)

 

Rick, regarding the Girodisc rotors. On their site, I only see Slotted Front 2 piece front and rear rotors. I didn't see any super lights. The ones they list are lighter in the front and rear. Are these okay for STU? What about the Works 2 piece rotors. I know the "thickness" of the rotors are the same and are also lighter alternatives. Thanks.

 

From the rulebook:
"14.6 BRAKES
A. Non-standard brake rotors may be used provided they are of equal
or larger dimensions (diameter and thickness) and made of ferrous
material (e.g. iron). Thickness includes the individual plates of a
vented rotor, as well as the overall dimension. The diameter for replacement
rotors is measured at the minimum outside dimension.
Aluminum rotor hats are allowed. Cars originally equipped with solid
(non-vented) rotors may utilize vented rotors. Cross-drilled and/or
slotted brake rotors may be fitted provided all such voids are within
the disc area, and comprise no more than 10% of that area. Brake
calipers and mounting brackets may be replaced provided they bolt
to the standard locations and the number of pistons is equal to or
greater than standard. A functioning emergency brake of the same
type, operation, and actuation as OE must be present. Drum brakes
may be replaced with disc brakes of a diameter equal to or greater
than the inside diameter of the standard drum. Such conversions
must be bolted, not welded, to the axle/trailing arm/upright, and must
include an integral, redundant emergency brake. Changes to backing
plates/dust shields/brake lines to accommodate"

The rulebook is here:
http://scca.cdn.racersites.com/prod/..._Rules_May.pdf

So the rotors you mentioned should be fine.

Rick

 

Thanks, was getting different information regarding these.

 

I think the confusion is because Girodisc did do a limited run of "Ultralite" 2pc rotors that are way thinner than allowed for STU, so they're definitely illegal. I don't think they were ever listed on the site.

 

Is the AMS intake for the Evo X legal in STU? It replaces the housing for the MAF sensor which I think is legal but it also relocates the BOV which may not be?