STX Rules and Setup Questions

[Kido1986]

Yes, it is legal. If you're upgrading FOR STX, realize that the stock brakes with good pads work very well. I believe (correct me if I'm wrong guys) but BIll and others mostly upgraded brake kits for the reduction in unsprung and rotating mass, went with lightweight kits.

With certain brake pads, I've had more grip than my RS3s can handle (mind you I was on 215s) so I can imagine there is enough brake grip in the stock setup plus good pads to set the ABS off whenever you when.

Be mindful of weight with bigger brakes if youre doing this primarily for autocrossing

[2superblus]

Brake rules for Street Touring classes:


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 these changes
are permitted but may serve no other purpose.
B. Brake lines may be substituted with alternate DOT-approved flexible
brake lines.
C. Air ducts may be fitted to the brakes provided that they extend in a
forward direction only and that no changes are made in the body/
structure for their use. They may serve no other purpose.
D. Original equipment ABS braking systems may be electrically disabled
but may not be removed or altered in any other way.

[Sccabrz192]

Originally Posted by Stevo22

Not a big deal to me. I am going to nationals and I doubt once I have it someone would contest me over it regionally. Just doesn't make sense to me lol. But that is good info because I have a letter drafted I will not send now. I do like to try to play by the rules.

Send the letter anyway, specifically ask what about the modification is not within the scope of the class. All they ever publish about turning things like this down is "not within the scope" or "not within the spirit" of the class. I think it's widely agreed upon that non-performance modifications which are relatively inexpensive in the name of longevity and reliability for MULTI PURPOSE (ST* was formed as a MULTI PURPOSE CLASS) are absolutely within scope. It may not be "necessary" for autocross purposes, but it is for other types of competition and uses which are within the target audience of the class. It's not like anyone is asking for aftermarket dry sump systems or to allow free reign on oiling system modification, Seems the decision makers are some of the only people who don't understand this, or don't care.

[EN2_Squirrel]

For all of you with headers. I obviously want power/toque when tuned but have to worry about sound (93.0db) here in san diego. any suggestions?

[whataboutbob]

Originally Posted by EN2_Squirrel

For all of you with headers. I obviously want power/toque when tuned but have to worry about sound (93.0db) here in san diego. any suggestions?

Lift near the sound meter. :P

[EN2_Squirrel]

Originally Posted by whataboutbob

Lift near the sound meter. :P

The sound meter is, from what i understand, supposed to be 50ft off course in the middle of a 100ft straight. I cant afford to lose any more time to derek.

[SubiePig]

Originally Posted by EN2_Squirrel

For all of you with headers. I obviously want power/toque when tuned but have to worry about sound (93.0db) here in san diego. any suggestions?

I just went to a full exhaust and had stock midpipe with a axleback delete. Stock catback is back on for now cause the noise was intense. I am thinking that I will be fine once I find a catback that is a good compromise between weight and noise. I want to hear the Tomei 60S with a full exhaust so don't get the wrong thing by mistake.

[EN2_Squirrel]

Originally Posted by SubiePig

I just went to a full exhaust and had stock midpipe with a axleback delete. Stock catback is back on for now cause the noise was intense. I am thinking that I will be fine once I find a catback that is a good compromise between weight and noise. I want to hear the Tomei 60S with a full exhaust so don't get the wrong thing by mistake.

Jdl or fa20 club headers (havent decided on catted or not yet) and perrin header back.

[Eric1855]

I think with the Perrin headerback you should be fine.

I have the P&L catted header, then catless header back to a resonated Perrin Catback and the sound is fine. Loud, but legal. According to the dB meter app on my iphone it hits the high 90s when you are standing right behind the car, but it drops off quick a few feet back.

Now if you go with a single exit exhaust you probably won't be legal, they can be ridiculous. I know they make some with a silencer so that could be an option. I had a a catless turboback on my WRX that was really loud, but I had a bolt in silencer to put in if I was at a sound limited site. You can also fab up turn downs to clamp on too, I've seen that before.

It also seems with these cars they actually get almost quieter when you get up in the powerband, but I have no quantitative evidence to support that though.

[SubiePig]

Originally Posted by EN2_Squirrel

Jdl or fa20 club headers (havent decided on catted or not yet) and perrin header back.

JDL UEL catless

[PoorMansRacing]

It looks like my TT-prepared car will be seriously underhanded in Street Prepared (once we get placed in a category). I would sacrifice the cat delete but no way am I willing to sacrifice an oil cooler or upgraded radiator. womp womp

[Kido1986]

Locally, I doubt anyone will care if you have those mods. As long as your radiator isnt a real weight savings

[Eric1855]

Originally Posted by BRZTimeTrials

It looks like my TT-prepared car will be seriously underhanded in Street Prepared (once we get placed in a category). I would sacrifice the cat delete but no way am I willing to sacrifice an oil cooler or upgraded radiator. womp womp

Can you do the Oil Cooler in SP? I was thinking that was SM and up.

[G_Ride]

Originally Posted by Eric1855

Can you do the Oil Cooler in SP? I was thinking that was SM and up.

I believe oil coolers are allowed in SP.