ZERO SPORTS Subaru Impreza WRX STI Prodrive Style BTZ201 '01 350PS
Tuned to replicate ZERO SPORTS Impreza WRX BTZ201
BEST MOTORING Tsukuba Skyline VS Tuner Special Battle - Sports Hard
CAR : Subaru Impreza Sedan WRX STI Prodrive Style (Type-I) '01
Tire : Sports Hard
Specs
Horsepower: 345 HP / 350 PS at 6000 RPM
Torque: 356.7 ft-lb at 4100 RPM
Power Limiter at : 97.4%
Weight: 1310 kg - stock JDM NB WRX Sedan curb weight 1340kg, Zero Sports has some lightweight parts
Ballast : 81 kg
Ballast Position : -47
Weight Distribution : 57 / 43 as in real life Zero Sports tuned balance, stock WRX is closer to 59/41.
Performance Points:
487
GT AUTO
NO Oil change
Improve Body Rigidity (
NOT INSTALLED in this build )
Wheels : Standard Size or +1 Inch Up - ENKEI RP03 or ADVAN RGII painted in Saddle Tan or Gold Metallic
( 17 inch was used in the Best Motoring event, while 18 inch used on demo car and Hyper Meeting at Tsukuba )
Car Paint : WRX Blue Mica
Tuning Parts Installed :
Sports Exhaust
Low RPM Range Turbo Kit
Intake Tuning
Suspension Fully Customizable Kit
Adjustable LSD
Twin Plate Clutch Kit
Fully Customizable Dog Clutch Transmission
Weight Reduction Stage 2
Carbon Hood ( Body Color )
Window Weight Reduction
Driver Controlled Center Differential ( DCCD ) - stock part
Racing Brakes Kit
LSD ( ZERO SPORTS GT 1.5 way Prototype rear and front - low optimal preload )
FRONT
Initial Torque : 20
Acceleration Sensitivity: 30
Braking Sensitivity: 15
REAR
Initial Torque : 13
Acceleration Sensitivity: 30
Braking Sensitivity: 15
Driver Controlled Center Differential
FRONT/REAR = 45/55 ( STOCK )
Suspension - ZERO SPORTS WINNING R Harmonic Drive Coil Over / 6 Way Damper Kit
Front, Rear
Ride Height: 110 140
( visual ride height )
Spring Rate: 10.00 8.00
Dampers (Compression): 4 7
Dampers (Extension): 5 8
Anti-Roll Bars: 2 3
Camber Angle: 1.3 1.5
Toe Angle: -0.16 0.00
DOG CLUTCH TRANSMISSION - Corrected stock gearing ( NB JDM 5 MT with custom final to replicate real final )
Install all power parts
Set Default
Set Final to 4.300
Set Auto Max Speed to 360kmh / 224mph
Adjust each gear :
1st 3.166
2nd 1.882
3rd 1.296
4th 0.972
5th 0.738
6th 0.702
( Ignore this if desired as stock gearbox is 5 speed )
Set Final Gear : 4.988
( stock final ratio is 4.444, but since redline is higher on Sti - 4.988 is used to replicate each gear speed )
Brake Balance:
3/5 ( personal BB) or for ABS 0 wheel : 3/5, for ABS 1 3/5 or feel free to use your preferred brake balance.
Recommended setting for DS3 user :
Steering sensitivity at +1 or +2, all aids off, except ABS 1 ( if not comfortable with ABS 0 ) with 3/5 brake balance as starting point.
Notes :
ZERO SPORTS first taste of New Age WRX, the NB WRX Sedan was used as test bed for many of their early new age prototype parts for the GD series WRX, from suspension, engine, drivetrain, LSD and body kit/rear wing.
Power is at modest 350PS with 1.3kg/cm2 boost, while the optimum actual output at the same boost level is 370PS, the reduction is due to the high ambient temperature during the event at 37 degree celcius. This forced the engine to run milder fuel maps and less aggressive timing to reduce chances of detonation. The BTZ201 also uses Zero Sports own Coilover Winning R spec with the newly designed 6 way Damper, and many of prototype stage performance parts.
Gearing has been replicated as close as possible, the actual car is JDM WRX NB Sedan, with 5MT gearbox that has unique close ratio and 4.444 Final available only on JDM models at the time. To replicate the gear speed, I have to account for engine redline / max rpm differences. The WRX NB engine have a lower redline at around 7500rpm, while the STi used in this replica build can rev close to 8500rpm.
With replicated gearing from 5 speed and 4.444 final, the STi managed similar gear speed of a real WRX with similar ratio ( slightly different USDM '02 - '05 WRX ratio ) and lower final at 3.900. To account for the differences, I increased the final to 4.988, which I consider as close possible to JDM 5 speed NB gear speed.
During the Tsukuba Skyline VS Tuner Car Battle special event, the car was fitted with ADVAN A048 R ( R / soft compound ) semi slick - equal to sports hard in GT6. With a best lap of 1:02.53 during time attack session. This replica is capable to replicate the lap time, my best lap during testing session was 1:02.2xx after a few laps.
The stock Driver Controlled Center Differential ( Subaru DCCD ) can be set using RA Menu, stock value is used at 45/55, this setting gives great balance overall
Aim to hit 1:02.53 or better on sports hard at Tsukuba
Specification list :
Complete name : ZERO / SPORTS Impreza BTZ201
Base vehicle : Subaru Impreza WRX NB Sedan (5F M / T) Base
Model Engine displacement : TA-GDA A type EJ20 1994cc 370ps / BOOST 1.3kg/cm2 -Optimal, 350PS at BM event 2001.
Turbine Wastegate : IHI RX6 Tcw76 Ex20 Wastegate
Computer : ZERO / SPORTS S. P. DATAR ECU(full order only CPU)
Injector fuel system : Main 550cc injectors and High capacity pump variable fuel regulator
Camshaft/piston : Forged pistons
Air cleaner : ZERO / SPORTS Direct Flow Kit
Cooling / Intercooler : Intercooler ZERO / SPORTS Prototype
Exhaust system :
ZERO / SPORTS Exhaust Manifold
ZERO / SPORT World League Exhaust Muffler
Prototype turbine support pipe
Prototype front pipe
Transmission system :
ZERO / SPORTS N1 Clutch Kit
ZERO / SPORTS Flywheel 5.3kg
ZERO / SPORTS GT LSD (front) Prototype
ZERO / SPORTS GT LSD (rear) Prototype
ZERO / SPORTS Works short shift kit
Big Brake Rotor kit - brake system ZERO / SPORTS 6POT brake caliper
ZERO / SPORTS short stopping distance Brake Pad (F ZP-4)
ZERO / SPORTS short stopping distance Brake Pad (R ZP-3)
ZERO / SPORTS Stainless steel mesh brake hose
Suspension system :
ZERO / SPORTS Winning R six-stage / way adjustable damping force control type ( Harmonic Drive Kit )
Spring rate : F 10kg/mm R 8kg/mm
ZERO / SPORTS Stabilizer (front)
ZERO / SPORTS Stabilizer (rear)
ZERO / SPORTS PG strut tower bar (prototype)
ZERO / SPORTS PG tower bar (rear)
ZERO / SPORTS N1 radiator brass 3-layer cooling system
ZERO / SPORTS N1 oil cooler (prototype)
ZERO / SPORTS Cool radiator ( for demo car only )
Aero :
(exterior) ZERO / SPORTS front bumper spoiler
(Air dam style Limited) ZERO / SPORTS side step
ZERO / SPORTS rear bumper spoiler
ZERO / SPORTS rear air dam wing
ZERO / SPORTS carbon fiber air duct
Interior :
ZERO / SPORTS Shift Boot (black / red stitch)
ZERO / SPORTS floors - carpet (prototype)
ZERO / SPORTS Formula Starter Kit Type 1
TAKATA 5-point Harness / Seat Belt
Defi tachometer, exhaust gas temperature gauge, boost gauge, water temperature gauge, oil temperature gauge, fuel pressure gauge.
Sparco Racing Steering Wheel
Seat Recaro SPG
Other :
Engine oil ZERO / SPORTS engine oil ZSR racing Max (15W-50)
Gear oil ZERO / SPORTS gear oil RM80 (80W-90)
Tire Yokohama ADVAN A048R (245/40-18inch) - Soft Compound
Wheel Yokohama ADVAN RC2 gold (18inch)