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Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB (https://www.ft86club.com/forums/index.php)
-   Tracking / Autocross / HPDE / Drifting (https://www.ft86club.com/forums/forumdisplay.php?f=39)
-   -   STX Rules and Setup Questions (https://www.ft86club.com/forums/showthread.php?t=25779)

Scooby South 01-06-2013 10:08 PM
STX Rules and Setup Questions
 
As a former Impound Chief, Tech Chief, and General Rules Nazi, I am opening this thread to help people understand the Rules for STX in SCCA Solo competition.
If you have questions on what may or may not be legal ... Post away.. there are quite a few 'experts' here on the site that will be available to help you understand what your getting into..

Some General Rules to consider:

-The Car is classed in STX Class, Which has a pretty big following since most of the mods that are allowed are pretty much the mods your doing anyways..
-STX is a Street Tire Class.. so your tires have a minimum of 200 treadwear, and they can be no wider than a 265 on a 9in wheel.
-Suspension Swaps are allowed....Springs Swaybars, Coilovers, and Bushings...
-Exhaust mods are allowed including the Header, overpipe, Midpipe and catback with an aftermarket system...the only stipulation is that you must have a cat in your system.. you can Delete the Factory Cats and replace it with a Hi-flo unit as long as its within 6 in of the furthermost cat (the back one)...
-Any Intake System can be used as long is it mounts to the OE Throttle body.
-Any Engine management Can be used to achieve optimum tune
-Aftermarket BBK as long as they are the same size or larger than stock. Brake Lines can be changed to Stainless with any fluid.
-Lightweight battery as long as it puts out the same voltage. and you can re-locate it if needed to the trunk area.
-Engine and tranny mounts as long as they are NOT solid
-Any LSD.
-Any Seats can be used but there is a minimum weight.(25lbs for the whole assy)

What CAN'T BE DONE:
-no engine internals
-no Tranny/rear diff Gear changes
-no throttlebody work
-Radiators have to comply with Stock


This should get most of your started. have any questions.. Don't hesitate to post them up.. Glad to help

Bill

Scooby South 01-06-2013 10:41 PM
other Vehicles you will compete with in STX:
-02 to 08 WRX
-Mazda RX8/Mazdaspeed 3,6,Protege'
-BMW 3series NON M/128
-Mustang various years
-Honda Integra Type R
-Chevy Camaro/Cobalt SS
-Audi A3/A4/TT Quattro
-Eagle/Mitsu Talon/Eclipse AWD
-Honda Civic Si
-Inifiniti G35
-Lexus IS300
-Mini Cooper S and S JCW
-Nissan 300 ZX non-turbo/Sentra SER SPec-V
-Pontiac Firebird
-VW Beetle/Golf/GTI/Jetta/Passat 2.0T and a R32
-Volvo C30

those are what is eligible for competition..
The BMWs are super Competitive as well as some WRX's..I have even seen an R32 fairly competitive...

Bill

Scooby South 01-08-2013 01:36 PM
I will be adding Sections of the rules for ST...So you can always refer to this thread if you get lost..:)

Quote:
14. STREET TOURING CATEGORY
The Street Touring category of vehicle modifications is meant to fit between
the current Stock and Street Prepared categories. This category
provides a natural competition outlet for auto enthusiasts using affordable
sports cars and sedans equipped with common suspension and
engine modifications compatible with street use.
Under the provisions of Section 1.1 of these rules, Regions are free
to allow any other version of the ST concept which meets their local
needs. In particular, some leeway in the area of bodywork allowances
(e.g., wings/spoilers beyond those allowed in 14.2.F) is encouraged at
Regional SoloŽ events.

Scooby South 01-08-2013 02:05 PM
Quote:
14.1 AUTHORIZED MODIFICATIONS
All SoloŽ Rules Stock Category allowances, plus all allowances contained
in 14.1 through 14.10.
14.2 BODYWORK
A. Pedal cover kits and other interior cosmetic accessories may be
added. “Dress-up” items such as chrome dipsticks and non-standard
filler caps are permitted, provided they serve no other purpose.
B. The driver and front passenger seats may be replaced, with the following
restrictions: The seating surface must be fully upholstered.
The top of the seat, or an attached headrest, may not be below the
center of the driver’s head. The seat, including mounting hardware,
must weigh at least 25 pounds and must be attached using the OE
body mounting holes/studs. Additional mounting points may be added.
C. Factory rub strips, emblems, mud flaps, bolt-on front valance lips/
spoilers, and fog lights (except those integral to a headlight or turn
signal) may be removed. Rear wings may be removed so long as the
vehicle retains any federally-mandated third brake light.
D. Alternate steering wheels are allowed except that steering wheels
with an integral airbag may not be changed.
E. Fenders may not be cut or flared but the inside lip may be rolled to
gain additional tire clearance. (The outer fender contour may not be
changed.) Plastic and rubber wheel well splash shields may be modified
for tire clearance and to accommodate a rolled inside fender lip.
The modifications may serve no other purpose (e.g. air intake, brake
ducts, etc). No other changes to the stock fenders or wheel wells are
permitted.
F. Addition of spoilers, splitters, rear wings, bumper covers, valances,
side skirts, and non-functional scoops/vents is allowed provided that
either:
1. It is a production part which is standard or optional equipment of a
US model of the vehicle.
82 — 2012 SCCAŽ National SoloŽ Rules
2. It is listed in the vehicle manufacturer’s US accessory catalog
for that vehicle for normal highway use. This does not allow for
parts sold through a manufacturer’s performance catalog (e.g.,
Ford Racing, HPD, MazdaSpeed, Mopar Performance, Mugen,
NISMO, SPT, TRD, etc).
Parts must be installed as directed by the manufacturer. Exact replicas
(including weight) from alternate sources are also permitted.
some more..:)

GTB/ZR-1 01-08-2013 03:17 PM
So... What are you guys going to run for spring rates?

I think I'm going to run higher rear rate, keeping in line with what the factory did, but will probably dial back % difference.

whataboutbob 01-08-2013 03:24 PM
I've put RaceCompEngineering springs on the factory struts - for now.

Scooby South 01-08-2013 03:32 PM
7K Front 6k rear...

Gathering a selection of springs from 6k up to 10k in .5k increments..
but right now.. not needed as the car is pretty balanced like it sits..

might try 8.5k front with 7.5k rear for testing purposes..... but seriously not needed right now..


Bill

feldy 01-08-2013 04:01 PM
I just want to be clear. Currently e85 is still legal... but that maybe changing soon correct?

Scooby South 01-08-2013 04:15 PM
Quote:
Originally Posted by feldy (Post 652024)
I just want to be clear. Currently e85 is still legal... but that maybe changing soon correct?
yes... correct.. E85 is out for comment right now.. no decision has been made yay or nay. in regards to it right now.. I personally am going to tune to E85 until I am told different..:)

Amadeus 01-10-2013 02:01 PM
Supercharger ok?
Catless headerback ok? There is still a factory cat in the header.

ABQautoxer 01-10-2013 02:02 PM
Supercharger not ok.

You must have at least one cat within 6" of one of the original locations in your exhaust.

Amadeus 01-10-2013 02:23 PM
Quote:
Originally Posted by Scooby South (Post 648525)
...the only stipulation is that you must have a cat in your system..
Our cars have two cats - in the header and the front pipe. I was hoping having one of the two factory cats would suffice in case you run a catless front pipe.

Scooby South 01-10-2013 02:31 PM
Quote:
Originally Posted by Amadeus (Post 656535)
Our cars have two cats - in the header and the front pipe. I was hoping having one of the two factory cats would suffice in case you run a catless front pipe.
the way its setup... you can run one or the other.. Personally I am going to run a Catless header...overpipe and catted midpipe and open cat-back with a turn down.. if you wanted to you can run a Catted header, overpipe and non catted midpipe.. Both Achieve the same goal..and Time will tell which is more Efficient.. :)

Bill

Amadeus 01-10-2013 02:37 PM
Quote:
Originally Posted by Scooby South (Post 656551)
the way its setup... you can run one or the other..
Cool. I didn't want to buy another front pipe. Thanks

miwialex 01-10-2013 03:02 PM
Quote:
Originally Posted by Scooby South (Post 656551)
the way its setup... you can run one or the other.. Personally I am going to run a Catless header...overpipe and catted midpipe and open cat-back with a turn down.. if you wanted to you can run a Catted header, overpipe and non catted midpipe.. Both Achieve the same goal..and Time will tell which is more Efficient.. :)

Bill
This might not exactly be true. I haven't exactly looked too closely at the exhaust system yet, and don't know how far apart the two cats are from each other, but if you are going from 2 down to 1, the replacement cat has to be no more than 6 inches from the exit of the last cat.

Quote:
E. Catalytic Converters - Any high flow catalytic converter(s) are allowed,
but must attach within six inches of the original unit. Multiple
catalytic converters may be replaced by a single unit. The inlet of the
single replacement converter may be located no further downstream
than 6” along the piping flow path from the original exit of the final
OE converter.
This means that the replacement cat, has to be within 6 inches of the one in the midpipe. If the cat in the header is within 6 inches, its fine. If not, then you can't do it.

ABQautoxer 01-10-2013 03:05 PM
Quote:
Originally Posted by miwialex (Post 656615)
This might not exactly be true. I haven't exactly looked too closely at the exhaust system yet, and don't know how far apart the two cats are from each other, but if you are going from 2 down to 1, the replacement cat has to be no more than 6 inches from the exit of the last cat.

This means that the replacement cat, has to be within 6 inches of the one in the midpipe. If the cat in the header is within 6 inches, its fine. If not, then you can't do it.
Just so everyone is clear, that is the FARTHEST it can be downstream is 6" past the last cat. You can however put it within 6" of the upstream one instead. Given the design of the stock header and aftermarket headers we have seen so far it would be vary hard to not meet this rule.

Amadeus 01-10-2013 03:35 PM
http://cms.scca.com/documents/Solo%2...categories.pdf
STX class on page 2; <5.1 na or <2.0 fi
Factory Supercharged only?

I'm not replacing the front pipe cat - I'm deleting it and have only the one in the header.

Scooby South 01-10-2013 03:54 PM
Tire Rack Getting the Z2 instock here soon...AND ordered..:)
http://www.tirerack.com/tires/tires....el=Direzza+ZII

miwialex 01-10-2013 03:55 PM
Quote:
Originally Posted by ABQautoxer (Post 656623)
Just so everyone is clear, that is the FARTHEST it can be downstream is 6" past the last cat. You can however put it within 6" of the upstream one instead. Given the design of the stock header and aftermarket headers we have seen so far it would be vary hard to not meet this rule.
ah makes sense. the wording I guess was just a bit confusing to me

Scooby South 01-10-2013 05:01 PM
Quote:
Originally Posted by Amadeus (Post 656700)
http://cms.scca.com/documents/Solo%2...categories.pdf
STX class on page 2; <5.1 na or <2.0 fi
Factory Supercharged only?

I'm not replacing the front pipe cat - I'm deleting it and have only the one in the header.
yes Factory only..:) ...like a Cobalt...

not applicable to an aftermaket unit..:)

Bill

whataboutbob 01-10-2013 06:18 PM
Quote:
Originally Posted by Scooby South (Post 656739)
Tire Rack Getting the Z2 instock here soon...AND ordered..:)
http://www.tirerack.com/tires/tires....el=Direzza+ZII
245/40R17 Z2 on order here too. Est avail is mid March 2013.

Scooby South 01-10-2013 06:25 PM
Quote:
Originally Posted by whataboutbob (Post 657053)
245/40R17 Z2 on order here too. Est avail is mid March 2013.
nope...might want to check again... Shipment is coming in on the 16th of Jan.. at least thats what I am told... they are in Customs now..:)


Bill

OrbitalEllipses 01-10-2013 06:30 PM
Quote:
Originally Posted by Scooby South (Post 656739)
Tire Rack Getting the Z2 instock here soon...AND ordered..:)
http://www.tirerack.com/tires/tires....el=Direzza+ZII
Expensive! Let me know how that wet traction is.

whataboutbob 01-10-2013 07:10 PM
Quote:
Originally Posted by Scooby South (Post 657065)
nope...might want to check again... Shipment is coming in on the 16th of Jan.. at least thats what I am told... they are in Customs now..:)


Bill
That would be AWESOME!

GTB/ZR-1 01-10-2013 07:22 PM
Would like to see a back-to-back w/ the R-S3s to see which one is faster. Also, why is the 245/40-17s heavier than the 255s?

whataboutbob 01-10-2013 07:25 PM
1 Attachment(s)
Quote:
Originally Posted by Scooby South (Post 657065)
nope...might want to check again... Shipment is coming in on the 16th of Jan.. at least thats what I am told... they are in Customs now..:)


Bill
You must have a _good_ connection.

Scooby South 01-10-2013 07:27 PM
Quote:
Originally Posted by GTB/ZR-1 (Post 657173)
Would like to see a back-to-back w/ the R-S3s to see which one is faster. Also, why is the 245/40-17s heavier than the 255s?
I think its going to depend on the course and venue.. I am going to have both.. RS3's and the Z2's .. both mounted up.. so I will have a choice..:)

Bill

GTB/ZR-1 01-10-2013 07:28 PM
Quote:
Originally Posted by whataboutbob (Post 657177)
You must have a _good_ connection.
Scooby South IS the connection... lol

GTB/ZR-1 01-10-2013 07:29 PM
Quote:
Originally Posted by Scooby South (Post 657183)
I think its going to depend on the course and venue.. I am going to have both.. RS3's and the Z2's ..
Baller :lol:

Scooby South 01-10-2013 07:35 PM
Quote:
Originally Posted by whataboutbob (Post 657177)
You must have a _good_ connection.
Hmmm Not sure..

https://sphotos-a.xx.fbcdn.net/hphot...44345406_n.jpg

Ahh I see the difference.. :).. mine are 255 ...and you guys are checking 245, which, according to TireRack is the 03/08/13 date...sorry

Eric1855 01-10-2013 07:39 PM
You all are talking two different sizes

The 255/40s are coming in January, but the 245/40s not until March.

Scooby South, what wheels and offset are you running with the 255s?

I want to go with 255s on 17x9 +42 RPF1s but I am worried about rubbing up front, do yours clear ok with coilovers? I saw Vorshlag had rubbing issues with 255s, but that was with oem sized coils.

ayau 01-10-2013 07:39 PM
Quote:
Originally Posted by Scooby South (Post 656739)
Tire Rack Getting the Z2 instock here soon...AND ordered..:)
http://www.tirerack.com/tires/tires....el=Direzza+ZII
ayau likes this.

Scooby South 01-10-2013 07:45 PM
Quote:
Originally Posted by Eric1855 (Post 657210)
You all are talking two different sizes

The 255/40s are coming in January, but the 245/40s not until March.

Scooby South, what wheels and offset are you running with the 255s?

I want to go with 255s on 17x9 +42 RPF1s but I am worried about rubbing up front, do yours clear ok with coilovers? I saw Vorshlag had rubbing issues with 255s, but that was with oem sized coils.
And yes I figured that out also.. 2 different sizes.....:)... same for rims 17x9 42.. same as I am running the RS3's on.. only a bit lighter..:)


Bill

Scooby South 01-10-2013 07:47 PM
Quote:
Originally Posted by GTB/ZR-1 (Post 657191)
Baller :lol:
only if you say so...:bonk:

Am I in your head yet... :happy0180:

Scooby South 01-10-2013 08:25 PM
From Toyko Autosalon... HOW APPROPRIATE..:)

http://jyuroku.com/wp-content/upload...01/FT-86-9.jpg


http://jyuroku.com/wp-content/upload...3-680x1024.jpg

whataboutbob 01-11-2013 12:51 AM
Quote:
Originally Posted by Scooby South (Post 657200)
Hmmm Not sure..

https://sphotos-a.xx.fbcdn.net/hphot...44345406_n.jpg

Ahh I see the difference.. :).. mine are 255 ...and you guys are checking 245, which, according to TireRack is the 03/08/13 date...sorry
Wasn't trying to be a jerk, just confused. :happy0180:

Please let us all know once you get yours how they are!

Scooby South 01-11-2013 12:55 AM
Quote:
Originally Posted by whataboutbob (Post 657936)
Wasn't trying to be a jerk, just confused. :happy0180:

Please let us all know once you get yours how they are!
its all good...I promise..:)

Scooby South 01-11-2013 05:24 PM
Rule of the Day:
Quote:
Any LSD can be used

AND then theres This:
looking forward to getting this installed at some point..:)

https://sphotos-b.xx.fbcdn.net/hphot...18790687_n.jpg

https://sphotos-b.xx.fbcdn.net/hphot...83969255_n.jpg

EN2_Squirrel 01-11-2013 09:33 PM
What about pulleys? Subframe braces?
Thanx in advance
Sent from my SCH-I510 using Tapatalk 2

whataboutbob 01-11-2013 10:01 PM
Quote:
Originally Posted by EN2_Squirrel (Post 659926)
What about pulleys? Subframe braces?
Thanx in advance
Sent from my SCH-I510 using Tapatalk 2
Don't answer his questions, he beat me in STX last time out. :bonk:


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