Re: 2008 STi track car Journal: SUSPENSION/WHEELS AND MORE
OLD Suspension modifications and other miscellaneous bits:
Whiteline urethane bushings throughout the car to replace stock bushings. Not all are listed. This is my initial build up of the car in late 2011 to early 2012.
Whiteline 24mm front sway bsf39xz, two hole adjustment
KLC139 Front Sway bar - link assembly
SuperPro adjustable links
Whiteline 24mm rear sways bsr49xxz, three hole adjustment
Blox Adjustable Spherical Rear Sway Bar End Links BXSS-10101-AEL (solid-metal on metal)
2011+ Subaru FRONT lower control arms (LCA) with SuperPro semi-rigid spherical bearing
Whiteline KSR207 Front Steering - rack & pinion mount bushing
Whiteline aluminum front control arm subframe brace
Whiteline adjustable toe rear upper arm bushings.
Whiteline Rear Lateral Toe Arm Adjustable with Toe Lock Kit
Agency Power billet rear lower camber control arms*
Whiteline KBR15 Rear Brace - sway bar mount support
Whiteline W0568 Rear Trailing arm - front bushing
Super Pro SPF3098K Rear Trailing arm - rear bushing (Whiteline does not offer a bushing for this spot)
Whiteline KDT907 Rear Crossmember - mount bushings (set of solid bushings)
Whiteline KCA326 Rear Control arm - upper inner bushing (camber correction)
Whiteline KDT906 Rear Differential - mount in cradle bushing
2013: Added Whiteline KCA313 Camber Kit (roll-center/bump-steer).
2013: Changed to MCS two-way shocks and H&R springs. 650lb front/800lb rear (about 11K/14K). Upgraded camber plates in spring of 2014.*
BC BR coilovers with 8K/11.6K F/R or 448/650 lbs per inch. GONE. See MCS two-way shocks update.
Front: BC 62 200 008 (448lb/8K) a 62mm nominal spring (that came with the coil-overs), with 3.4" OD.
Rear: (from Summit Racing) EIB-07002500650 (650lb/11.6K) Eibach springs. 62mm, nominal ID/3.45" actual OD.)
BC BR camber plates, slightly modified on driver's side to allow for max camber.
NOTE: Agency arms must be modified slightly, and have some material ground away, to clear the gas fitting on the bottom of the MCS shocks!
*Spring of 2014:
"HVT" Camber Plate for Subaru GR for Coilovers, #810TM-GR-COILOVERS
(Built to MCS spec: Lower spacer bored to 18mm x 7mm depth)
These recess into the engine compartment and recoup a full inch of travel over other camber plates/coilover setups. They seem discontinued as Of 2017. ;(
Kartboy short-throw shifter and all stiffening bushings
Group N tranny mount
Added for 2013: Agency Power Rear Pitch Mount (billet aluminum)
Group N motor mounts
949 Racing's 6ULR race wheels: 6ULR 17x9 +48 ET (offset) History...
Toyo R-888 DOT legal 255x40.
2013: upgraded to 18x10.5" Enkei RPF-01's (38ET) and 285X30 Hoosiers. After these I ran BFG 275/35. Almost identical footprint. BFG's are like 25.6"O.D. Enkei's are 8.94kg/19.7 pounds each.
| | | | | | ADDED: 5mm spacers to the front to allow as much as -3.5° front camber. Now set at -3.2. Otherwise 285-295 slicks rub the coilovers. |
5-2017: Added lightweight Enkei RS05-RR wheels (484-8105-6535) in Sparkle Silver (18x10.5) +35ET, 19.7 lbs., to my primary wheel sets. Also run fronts with 5mm spacers.
Note: front fenders have no lip and are stretch a bit to make everything clear; that and big negative camber.
ARP 100-7717 wheel studs:
12mm X 1.5mm, 3" long studs
rather than stock 12mm X 1.25mm (which is a finer thread and less common-meaning fewer lug nuts are available for the Subaru stud size, and they can be more expensive).
FYI: The ARP 100-7717 is for the Mitsubishi Lancer Evo VIII.
Hawk DTC 70's on the front and 60's on the rear. Also tried 60's on the front and 70's on the rear to try and eliminate all braking waggle.
DBA 5000 rotors and two-piece Girodisc in the back. These rotors are 12.835" in diameter or 326mm.
2013: upgraded front brakes to StopTech Trophy BBK. ST 40's with 355mm (14") rotors.
In 2014 I started running OS Giken racing diffs. They were custom set-up in their CA shop.
Rears: 25/45 refers to the cam angles for the "1.5 way" rear diff's. 25 degrees on deceleration, 45 on acceleration. Lock timing is 376kgs.
The front's "1way" is 3 degrees on decel (effectively ZERO) and 45 degrees on acceleration side. Lock timing is 184kgs.
I still run my stock center diff. I tune it with a DCCDPro, Active Center Differential Controller. I am running an '06 tranny, as I recall. It is the one tranny with the correct rear ratio for the rear diff ratio. It has the internal oil pump. I run the oil out to a cooler in the left fender. This has a close-ratio gearset.
Suspension alignment: -3.2 degrees negative camber in front/-2.4 negative in the rear.
Front caster: 6.9 degrees.
Toe: 0 front, rear is 0, erring to toe in.