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Old 01-17-2007, 07:35 PM   #1
kingbeann
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Default Listing of *ALL* STX legal mods for WRX with subjective prioritys

This is intended to be a listing of ALL specific mods legal for STX. The priority is subjective, but should reflect that the stuff that gives you more benefit has a higher priority (ignoring cost/benefit). This isn't intended to be a discussion of the best xxxx as there are a million threads discussing individual components (e.g. this coilover vs that).

DISCLAIMER: THROWING MONEY AT YOUR CAR WON'T MAKE YOU FASTER UNTIL YOU CAN PUT THE POWER TO THE GROUND SMOOTHLY. This list is only to illustrate what COULD be done to your STX WRX. National level winners have won with far less than everything on this list - BUT GREAT DRIVING SKILL. DRIVING SKILLS WILL ALWAYS HAVE THE GREATEST BENEFIT!

This subjective list is meant to be illustrative of how you would incorporate mods in stages based on benefit. It makes sense in some cases to do multiple things at once when doing major work (since the labor would be repetitive) even though they aren't both in the same category.

What am I missing? Any thoughts on the general priority listing? This should be as specific as possible regarding mods allowed. Feedback has and will continue to be incorporated.

High Priority
• Wheels 17x8, light as possible
• Tires 245/40/17, 245/35/17, or 235/40/17, (treadwear rating >140)
• Fenders rolled to accommodate tires (more important for us wagon owners)
• Performance alignment
• Coilovers/Shocks/Springs
• STi Group N tophats rear
• Camber plates front
• Camber adjustment for rear – camber bolts OR adjustable lateral links with pillow ball upper mounts OR camber plates
• Front swaybar
• Rear swaybar
• Endlinks front & rear
• Swaybar mounts and bushings
• Rear strut brace (wagon)
• Engine management (stock boost controls)
• Uppipe
• Downpipe
• Turboback lightweight, high flow exhaust which must have at least one cat no further back than 6” of end of last oem cat in the system (stay tuned for emissions legality rulings by SCCA) and meet sound requirements
• Trans and differential fluid (aka Redline shockproof, Uncle Scotty’s mix, etc)

Priority
• More aggressive brake pads
• High quality brake fluid, e.g. ATE Superblue or equivalent
• Stainless steel brake lines
• Lightweight racing seats (25 lbs min. weight, stock bolt locations)
• Lightweight battery
• Weight removal - (ensure current compliance with ruleset!)
• Front control arm (rear transverse link) bushings including offset bushings (gains caster)
• Short throw shifter kit with bushings
• Lightweight crankshaft pulley
• Underdrive accessory pulleys
• Header or PnP OE exhaust manifold
• Intake (pre-turbo stuff only)
• Turbo Inlet Hose
• Harness
• Big brake kit
• Motor mounts
• Transmission mounts

Low Priority
• Rotor upgrade – lighter, slotted
• Caliper upgrade – using same mounting points
• Steering rack bushings
• Front trailing link bushings
• Rear trailing arm bushings
• Lateral link bushings (if not already using adjustable lateral links)
• Differential mount bushings
• Rear differential fluid upgraded
• Rear strut brace (sedan)

Unneccessary – but legal
• Front strut brace
• Grounding kit
• Rollbar or cage
• Water wetter in coolant
• STi pitch stop
• Battery relocation to trunk
• Copper spark plugs (indexed to 12 o'clock)
• Thermostat
• Parts bin matching
• Factory overbore allowance of .020

All bushings listed are assumed to be an upgrade when going stiffer than stock. Also must comply with STX rules stating that the ratio of metal/non-metal must not be increased.
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Last edited by kingbeann; 02-24-2010 at 10:21 PM.
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Old 01-17-2007, 08:09 PM   #2
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Quote:
Originally Posted by kingbeann View Post
S
• Steering rack bushings (illegal in STX)
Completely legal in all classes EXCEPT Stock classes.
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Old 01-17-2007, 08:19 PM   #3
boundy3
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steering rack bushings are legal,

as well as you must have a cat within 6 in. of your last cat

also camber bolts in the rear are a good idea
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Old 01-17-2007, 08:32 PM   #4
kingbeann
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Updated steering rack bushings to legal
Added camber bolts for rear
Clarified exhaust with one high flow cat within 6" or last oem cat
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Old 01-17-2007, 08:37 PM   #5
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If you are building the car to be 100% all out STX...i'd move the underdrive/lightweight pully set into the higher priority category.


Every little bit counts at the highest levels.
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Old 01-17-2007, 10:58 PM   #6
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Harness or CG lock- high priority
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Old 01-17-2007, 11:05 PM   #7
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Is removing weight legal in ST? I know you can't run without the back seat, would this apply to sound deadening, radio, etc...?

Don't forget a rollbar or cage...completely legal since it is a "safety" modification.
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Old 01-18-2007, 04:13 AM   #8
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Instead of camber bolts for the rear, it's probably better to get adjustable lateral links...
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Old 01-18-2007, 06:05 AM   #9
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back seat has to stay.

complete removal of AC system and radio (except wiring) is legal as long as any holes are covered.

a cheap harness that bolts into seatbelt locations (and stock seat belt remains) is 100% better than CG lock any day.
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Old 01-18-2007, 07:30 AM   #10
wrx2.0 555
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Theres no rule like the steering wheel that prevents an Impreza owner of replacing their driver and passenger seat, is there. I dont remember anything like that. Because of the airbag, that is.......

You could add that to the list. Replace front seats as long as they meet the new 25lb rule--seat and rails--using stock mounting holes.
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Old 01-18-2007, 08:53 AM   #11
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seat-time!!!!
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Old 01-18-2007, 09:00 AM   #12
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I think lightening the car (including replacing/moving the battery) is probably a higher priority...probably more of a priority than everything in your 'priority' section except brake pads.
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Old 01-18-2007, 09:08 AM   #13
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You can also add intake, MAF elbow thingy (if the new intake doesn't already replace it), and a turbo inlet. You might also want to note that you can have adjustable lateral links OR camber bolts OR camber plates in the rear, but not more than one form of camber adjustment.

Another few notes:
While moving the battery to the rear helps weight balance, you are adding 5lbs of wire to do it.
Rolling the fenders isn't necessary unless you've lowered your car enough to screw up your roll centers and degrade performance. But its a free mod and doesn't hurt anything.
Water wetter in the coolant is questionable. I've never had my car overheat...ever. In fact, the temp seldom moves once its up to operating temp.
Headers...would recommed ported and polished stockers or equal length, as tuned length delays spool and reduces low RPM response.

Last edited by Scooby921; 01-18-2007 at 09:13 AM.
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Old 01-18-2007, 09:10 AM   #14
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Quote:
Originally Posted by 0000-09-0233 View Post
seat-time!!!!
2nded.

http://www.autocross.com/evolution

--kC
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Old 01-18-2007, 09:29 AM   #15
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Quote:
Originally Posted by kingbeann View Post
Low Priority
• Short throw shifter kit with bushings
I agree that the Short throw shifter kit isn't a high priority mod by a long stretch, but the shifter bushings are one of the best mods I ever did to my 99RS. They make a notable improvement in shift feel and shift speed (as it gets rid of a lot of that "bound up drivetrain" sensation on quick 1-2 shifts). IMHO, the shifter bushings are at least medium priority parts for an autocross car (that also happen to be cheap and easy to install, too).
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Old 01-18-2007, 09:33 AM   #16
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Push the motor mounts up the list, install them when you do the up-pipe, you'll have more than half the work to replace them done anyways at that time. They're worth the money and your time is already being spent on the labor.

Push header down the list, you'll gain peak HP but lose spool, depending on how your dyno sheet looks you may not want to do this one at all. Maybe consider P'n'P on the stock manifold instead.

Turbo inlet hose and intake should go on your power list. And as soon as you think you're done with all your power mods get a dyno tune by a GOOD tuner.

Rear pillow ball upper mounts and adjustable lateral links are a legal combination. IMO, that's the way to go, simple and easy changes to rear camber and toe are priceless.

Be careful combining underdrive accessory pulleys with the lightweight battery. Or if you do keep a jump-pack with you in grid.

For years I was a firm believer that a BBK in STX was a waste of money. Then we got one, because we were facing a significant cost to replace calipers anyways after one seized, and now I know better.

Also legal and not specifically listed:

STi pitch stop (minimal beneift but hey we were in there to replace the transmission anyways )
Front control arm bushings, including the Whiteline offset bushing.
Rear trailing arm bushings
Transmission and differential fluids, this is a CRITICAL one as the factory fluid is junk.
Spark plugs, copper plugs will wear out VERY quickly but can possibly help with a HP or 2.

And the way to get fast is always seat-time as was already mentioned. Throwing money at a car won't make you faster, in fact it often makes you worse by helping to hide where you are making mistakes.
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Old 01-18-2007, 09:36 AM   #17
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Low priority and priority appear to be almost completely flipped.
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Old 01-18-2007, 11:22 AM   #18
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The cat doesn't have to be WITHIN 6" of the last cat. It just cannot be any further back than 6" of the last cat. It can be as far forward as you like.

Also, if you can find grippy tires that fit your driving, 245/35-17 is an excellent size.

I would pull all the illegal items off your list (or make a separate "illegal" list). It's confusing to us simple-minded types the way you have it.

Were the radio & speakers optional on the WRX (in a line-item way)? If not, I don't see a provision to remove them in either stock or ST rules.

Definitely don't see any provision for removing sound deadening.

Last edited by jcroy66; 01-18-2007 at 11:29 AM.
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Old 01-18-2007, 01:23 PM   #19
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Quote:
Originally Posted by kingbeann View Post
• Ground wiring
Grounding kits are only covered in the Stock portion of the rules but it states

Quote:
“Grounding kits” specifically designed to support sound
systems are permitted but may serve no other purpose.
I interpret that as grounding kits are not legal (under the heading of "If they don't say you can do it then you can't).
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Old 01-18-2007, 02:03 PM   #20
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2007 rules added grounding kits to the ST ruleset.

New 14.9.B

"The addition of electrical grounding cables and associated distribution blocks/terminals is permitted. Holes may be drilled for mounting only. This does not permit the use of electrical enhancement components such as condensers, voltage controllers, etc."
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Old 01-18-2007, 02:40 PM   #21
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Quote:
Originally Posted by Scooby921 View Post
Rolling the fenders isn't necessary unless you've lowered your car enough to screw up your roll centers and degrade performance. But its a free mod and doesn't hurt anything.
Wagons need it with serious rolling stock.
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Old 01-18-2007, 03:14 PM   #22
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Quote:
• Tires 245/40/17 or 235/40/17, grippy as possible
I thought it had to be over 140 treadware.
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Old 01-18-2007, 03:17 PM   #23
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>=140, yep.
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Old 01-18-2007, 03:34 PM   #24
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Quote:
Originally Posted by jcroy66 View Post
I would pull all the illegal items off your list (or make a separate "illegal" list). It's confusing to us simple-minded types the way you have it.

Were the radio & speakers optional on the WRX (in a line-item way)? If not, I don't see a provision to remove them in either stock or ST rules.

Definitely don't see any provision for removing sound deadening.
i agree with jen. take off anything on that list that is illegal. the subject of this thread is "listing of all legal stx mods" putting the illegal stuff on there jsut makes it more confusing and the illegal list can go on for pages. its easier to list everything you CAN do. anything not on the list is therefor illegal.

radio and speakers is not legal to remove. also sound deadening is not legal like jen said.

oh... and btw... if you want to win... consider everything a priority
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Old 01-18-2007, 09:33 PM   #25
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Thanks for the feedback, this list is really coming along.
First edit - I agree with jcroy66 & angryfist - Illegal items removed from the top list.
I put these on here since I wasn't 100% sure in the first place and knew that whatever was wrong could be corrected.

For future reference, these were some things that were unclear (to me) but ARE illegal (removed above):
PnP Intercooler Elbows - No intake mods between turbo and engine

Intercooler Hose - No intake mods between turbo and engine

PnP Turbo - No intake mods between turbo and engine

PnP Throttle Body - No intake mods between turbo and engine

Weight removal - can't remove sound deadening, wagon roof rails, radio, or speakers. Wagon owners cannot change folding backseat to fixed (lighter) STi backseat.

Last edited by kingbeann; 01-20-2007 at 11:18 AM.
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