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THE JUN WRX – Jun Auto Mechanic’s “Super Lemon GDB” Bugeye

This is the JUN Super Lemon GDB.

For a time this car broke and held the lap record at Tsukuba circuit in Japan –– right when the track was making a name for itself as the proving grounds for high-horsepower creations from Japan’s top tuners. The retina scorching signature “JUN lemon yellow” paint and GTR-faced original ADVAN RG’s belie the true legacy of this car.

It wasn’t so much that it broke the record at Tsukuba – it was the way that it did it, and the Subaru vs. Mitsubishi rivalry for Tsukuba supremacy that was going on at the time. With *only* 582 horsepower and all OEM metal paneled body, the JUN WRX posted a lap time of 55.9 seconds and snatched up the title from HKS’s Mitsubishi Evo VII (56.814 second lap on Dec. 26, 2001). JUN’s record was only taken away by the Sun Auto’s Cyber Evo (55.801 seconds on Dec. 9, 2003 via Eiiji “Tarzan” Yamada) — but it took an additional 200hp over the JUN car to do so. Ten days after Sun Auto took the record, the record was broken again by the HKS Evo TRB-02 (54.739 second lap – Dec 19, 2003 via Nob Taniguchi) — a car which essentially was HKS’s old Evo VII but entirely rebodied in super lightweight carbon fiber widebody that you’d be hard pressed to find on a street car.

A similar comparison can be made to the McLaren F1’s world’s fastest production street car title only being taken away by a certain car only with an additional 400bhp (not to mention four extra cylinders, and four more turbo’s than the McLaren’s zero). OK maybe I’m exaggerating ; ) But the JUN WRX is loved among bugeye enthusiasts.

Older pics from the now-defunct Exvitermini blog (the Aussies behind the 1400-hp drag Skyline GTR-700). Don’t mind the 2003 digicam technology : P

JUN’s original-design front bumper (modified for this car with narrower center air dam to feed the v-mount intercooler/radiator and nothing else), one-off custom CF splitter purpose-built only for the JUN GDB… known to scrape perfectly level pavement in hard turns : P

WRC-style sport mirrors likely made by STI for the GC8-chassis Impreza and adapted to the JUN GDB.


Stock WRX reflector headlights (lighter weight than the JDM projectors and stock on the STI Spec C) with JUN original-design eyelids. GTR-faced Advan RG’s housing giant Endless big brakes and Zeal Function-SPL coilovers.

Hood with custom-cut vents for the V-mount intercooler (not a WRC drop-in hood vent despite similar look)… and cowl by the windshield likely to vent heat from the massive turbo setup. The hood eventually received NACA vents (see last pic).

Custom turbo location against the firewall with meticulously welded titanium turbo inlet piping. Split intake manifold with two gigantic surgetanks atop a 2.5L JUN stroker kit on a 2.0L EJ207 (this was before the EJ257 existed). Dual-core V-mount intercooler setup. JUN’s trademark green-to-yellow fade painted timing belt cover.

You may have seen the video of the white JUN GC8 setting a top speed run. That car was owned by a customer, this car was owned by JUN itself and allowed the company to flex its engineering might and be even more creative.

SARD GT wing with custom covered mounts (not unlike the Mugen wing for RSX’s) mounted on the chassis itself as opposed to the trunk… and JDM STI rain visors. A nice “street car” touch on this track beast.

…and an enormous one-off rear diffuser purpose built for the JUN Car with integrated rear bumper vents. Closest thing you can buy for a bugeye outright is the Mature diffuser but even that is dwarfed by the JUN race piece.


Dr. Susumu Koyama – V.P. of Jun Auto, tuner and brains behind the JUN WRX. photocreds to super street mag

SPECIFICATIONS
VEHICLE SUBARU IMPREZA GDB
ENGINE TYPE EJ25
BORE / STROKE 100mm / 79mm
TOTAL ENGINE DISP. 2482cc
COMPRESSION RATIO 8.1 : 1
MAX BOOST 1.6kg/cm2
MAX POWER 600ps / 7600rpm
MAX TORQUE 68.4kgm / 5400rpm
SETUP PARTS
CAMSHAFT JUN High Lift Camshaft INT 272-10.3/ EXH 272-10.3mm
CAM SPROCKET JUN Slide camsprocket
VALVE Stock
VALVE SPRING JUN Racing valve spring
VALVE RETAINER JUN Titanium valve retainer
PISTON JUN Stroker kit 2.5L piston 100mm
CONNECTING ROD JUN Stroker kit 2.5L connecting rod
CRANKSHAFT JUN Stroker kit 2.5L crankshaft
TURBINE TRUST TD06 25G
GASKET 0.7mm
BOOST CONTROLLER TRUST e-01
INTERCOOLER TRUST Twin core
OIL COOLER TRUST #16
INT MANIFOLD JUN Prototype 4 throttle surge tank
EXH MANIFOLD JUN Prototype
MUFFLER JUN Original titanium muffler
AIR CLEARNER K&N
RADIATOR JUN Aluminum V mount type
FUEL CONTROLLER F-CON V PRO
FUEL INJECTOR 1000cc
FUEL PUMP BOSCH
CLUTCH CUSCO Prototype twin
TRANSMISSION Stock 6speed
LSD F : CUSCO R : CUSCO RS 1WAY
BRAKE (F) ENDLESS 6POT 345mm Pad F&R MA11
TIRE ADVAN A-048 255/40-17
WHEEL ADVAN RG 9.5J-17(PCD 114.3 HUB) note: this car has multiple sets of Advan RG in different sizes… wheels shown looks more like an 18″
SUSPENSION ZEAL SUPER FUNCTION SPL F : 13k R : 16K
AERO PARTS
EYE LINE JUN eye line
FRONT BUMPER SPOILER JUN front bumper spoiler
REAR SPOILER SARD GT-WING

Keiichi Tsuchiya putting the JUN Car through the ringer and throwing it around the track for the Hot Version vol. 64 DVD