STX Set-Up Sharing & Results Thread

[forwallblakmail]

Nick Kelly/STX 30
Misery Bay Region SCCA (104)


Suspension -
Shocks: Off the shelf Racecomp Engineering Tarmac II's (replaced RCE Tarmac springs on Koni yellows) those are in the pictures
Springs: 400/400 (previous 280/290)
Camber plates: HVT
Rear camber: Stock bushings
Anti-roll bars: Racecomp Engineering 25mm front bar (soft)
End links: Stock
Upper strut bars: N/A
Bushings: Whiteline rear subframe inserts

Alignment & suspension settings -
Ride height: As the coilovers come
Rake: zero
Alignment: (Front)-3.1 camber/0 toe (Rear)-1.4/ 0 toe
Shock settings:close to the way they came
Weight:2645 last winter.
Tire pressures: 32

Engine & drivetrain -
Header: Stock
Over pipe: Stock
Front pipe/cat: Stock
Axle back: Nameless 5" mufflers
Intake: Perrin CAI (ordered)
ECU: Stock
Crank pulley: Stock
Motor mounts: Stock
LSD: Stock

Wheels/Tires, etc -
Wheels: Gold 17x8 Enkei RPF-1 45mm offset
Tires: 245 BFG Rivals
Wet tires: Same
Brakes: Carbotech XP12 F/R, DBA Club Spec T3 front rotors. Motul RBF 600 Fluid
Battery: Stock
Seats: stock

[vroom4]

Anyone have thoughts on 245 vs 255 rs3?

[vroom4]

Looks like simmons went back to the 245 over the 255 with the z2...which I believe has a stiffer sidewall. Which goes towards the 245/40 17 argument with the rs3.

[conedodging]

Most of the folks I know were on 245/40 RS3 last year. I'll likely start there.

(do we really need two STX threads?)

[Jetbill]

Originally Posted by neurokinetik

Has anybody attempted to make roll couple calculations yet? I'm considering trying it to get some idea of what the balance might be with different combinations of swaybars and springs. Since I already have that number available from my old Miata (using the old FatCat Excel sheet), it might give me a better idea of what direction I need to go with setting this car up.

I think all we need is the wheel rates for the various springs and swaybars, and we should be able to calculate the roll couple for our cars.

Didn't want to bump and old thread but searched and couldn't find anything...anyone know what the stock FRC% calculates too? I've done the calculation using FCM's calculator but seems arbitrarily low.

[rx3]

The KW v3 appears to be most popular choice regarding coilovers in STX.
Why aren't the KW clubsports applied? Does this have monetary reasons or are there technical reasons too (for example spring rates too high)?

[justint5387]

I think because v3 offers the best value relative to performance. Driven a friend's car on v3, i think the response is a little slower than monotube gas charged shocks.

[Silver Ignition]

any and all feedback is much appreciated...


Bryan Walsh
2013 FR-S 10 Series / #860 STX
New York Region

Suspension -
Shocks: KW v3
Springs: out-the-box KW v3 340/400
Camber plates: Vorschlag
Rear camber: SPC Lower Control Arms
Anti-roll bars: Perrin front / TRD rear
End links:Front: Perrin front links / stock rear links
Upper strut bars: Homemade 2-point (similar to Grimmspeed bar)
Bushings: Whiteline Rear Subframe Inserts

Alignment & suspension settings -
Ride height: 1" Drop from Stock
Rake: 10mm rake
Alignment: FRONT: -3.1 camber/7.3caster/.12 toe out ... REAR: -2.0camber/-.10 toe-in
Shock settings: FRONT- +3 compression, +5 rebound / REAR- +2 comptession, +4 rebound (from full soft)
Weight: Stock minus trunk junk
Tire pressures: 27.5-29psi hot

Engine & drivetrain -
Header: OpenFlash Header
Over pipe: Stock
Front pipe/cat: Stock
Cat-Back: TRD Cat-back (factory installed)
Intake: Grimmspeed
ECU: OpenFlash Tablet w/ off-the-shelf 93oct Stage2 OFH
Crank pulley: Perrin
Shifter: Stock
Shifter bushings: Perrin
Motor mounts: Stock
LSD: Stock
Dyno results: never dynoed

Wheels/Tires, etc -
Wheels: 17x9 +35 Varrstoen ES2
Tires: BFGoodrich RE-71R 245/40R17
Wet tires: Same.
Brakes: Front- Hawk Street Performance 5.0 // Rear- Stock
Battery: Stock
Seats: Stock

[smg1138]

I noticed some of you guys are using a 5mm wheel spacer. Are you also using extended studs or can the stock studs handle that much spacer?

[MarkR171]

Originally Posted by smg1138

I noticed some of you guys are using a 5mm wheel spacer. Are you also using extended studs or can the stock studs handle that much spacer?

The max recommended on stock studs is 3mm (and I wouldn't even risk that for just 3mm.) I use ARP extended studs with a 10mm spacer in front and 5mm rear because I have 45mm offset wheels and stock size spring perch (C-Street, not STX car.)

[BlaineWasHere]

I also run APR studs. My RPF1s are 45 offset so i run 15mm spacer in the front 10 in the rear.

Sent from my SM-G550T using Tapatalk

[renfield90]

Originally Posted by MarkR171

The max recommended on stock studs is 3mm (and I wouldn't even risk that for just 3mm.) I use ARP extended studs with a 10mm spacer in front and 5mm rear because I have 45mm offset wheels and stock size spring perch (C-Street, not STX car.)

I'm confused? +45mm offset wheels with a 10mm spacer gives you +35mm total offset. Spacers subtract from offset, not add to it.

+35mm total offset is not legal in C Street.

Agreed that I would not run a spacer on stock studs. That's asking for trouble.

[MarkR171]

Originally Posted by renfield90

I'm confused? +45mm offset wheels with a 10mm spacer gives you +35mm total offset. Spacers subtract from offset, not add to it.

+35mm total offset is not legal in C Street.

Agreed that I would not run a spacer on stock studs. That's asking for trouble.

You're correct. That's for my daily driver 17x9 et45 enkei rpf1s that didn't rub when I was on coilovers, but with -1.3ish negative camber and stock size dampers (koni w/ trd springs) they rub the spring perch.

I don't use a spacer when autocrossing on the stock 17x7 wheels.

[renfield90]

Originally Posted by MarkR171

You're correct. That's for my daily driver 17x9 et45 enkei rpf1s that didn't rub when I was on coilovers, but with -1.3ish negative camber and stock size dampers (koni w/ trd springs) they rub the spring perch.

I don't use a spacer when autocrossing on the stock 17x7 wheels.

Gotcha, thanks for clarifying.

Yeah, for anyone running stock sized springs and a 9" wheel, you're gonna need to get pretty far under the stock offset.