Susumu Koyama deals in speed. Not so much Maverick's homoerotic, volleyball-playing, Ninja-riding speed, or even that "prescription" diet pill speed but real speed, the kind that comes when you shoot up cars with heavy doses of horsepower and let them loose. And Koyama-san's speed lab is not some mold-infested mobile home with a rusted out Hemi 'Cuda in the front yard but exists deep within the hallowed service bays of JUN Auto.
JUN Auto can best be described as a three-slice pie. I had a pie chart to show you but Jonny ate it mistaking it for a real pie. JUN Machine Shop represents one piece of the pie, crafting the finest bits of cutting-edge tuner car hardware, JUN Auto Works is the body works division, and JUN Auto Mechanic is the place where it all comes together in an orgy of tuning precision. This is Koyama-san's house. And what a house it is.
But right now, ain't nothing hotter in Japan than Time Attack and JUN Auto is well-skilled in the art of clock management. At the December '03 Option magazine Time Attack event Super GT driver Mitsuhiro Kinoshita went 0:56.595 in the JUN Auto's Super Lemon GDB, making this the fastest Subaru at Tsukuba (ha, say that five times fast). And even before this, Kinoshita-san drove the Hyper Lemon Evo V to a 0:55.976 lap at Tsukuba. Koyama-san tells us that this is the fastest JUN Auto demo car at Tsukuba-for now.
Poised to take the number-one-son position from the Hyper Lemon Evo in the JUN Auto family of super lappers is the Hyper Lemon 350Z R you see before you. Now, you might be questioning how an FR like the Z33 could even hope to keep up with the sophisticated grip of an AWD like the CP9A. You know what, that would have been a damn fine question-along with, "What was the best thing before sliced bread?"-except for the fact that this Z33 is an all-wheel-drive machine. Before you exit Asian Thumbs to check out Nissan.co.jp in search of a JDM-only AWD Z33 NISMO Z-tune edition, know that there is no such thing (now you can resume your quest for any links with German tourists and Thai lady-boys). That's right, the all-wheel-drive system on this Z is custom-made, which is just a wee-bit more difficult than that five-bolt conversion on your S13.
Koyama-san created this AWD Z33 for a couple reasons that actually make sense. First of all, by working out a lot of complex computations and downright guesstimations that are beyond our grasp, Koyama-san figured that he would need at least 800 ps (or 788 of our Yankee hps) to run a good number at Tsukuba. And this is too much power for an FR on treaded street tires. But then wouldn't it just be simpler to start with an AWD like the Evo, Impreza or GT-R?
"I like the Z very much because I remember that I drove a Z32 at the Bonneville speed trial in '91 making over 260mph," Koyama-san told our source (who is actually our J-boy, Tetsu). "I also wanted to build the only AWD Z33 in the world." Mission accomplished, Koyama-san. While the changing of spark plugs scares us, the thought of swapping out an entire drivetrain makes our heads explode. Here's a quick rundown in case you're thinking of trying this swap yourself-and if you are... don't.
Koyama-san selected the ATTESA E-TS AWD system from a R32 GT-R because frankly, it's less complex than a R34 with all of its additional electronic bells and technological whistles. The front differential case is from a JDM M35 Nissan Stagea AWD and the front subframe was liberated from a V35 Skyline AWD (our G35). The front axles are one part BNR32 Skyline and one part M35 Stagea. The Z33 rear axles were spared the ignominy of the scrap heap, but the front and rear suspension arms were plucked from a PY50 Nissan Fuga (think Infiniti M) and the front upper arms are JUN adjustable units. Zeal Super Function R coilovers, Endless Racing binders and Advan rollers complete the footwork. With all of this fabrication and parts bastardization you'd think Koyama-san would just drop in an RB26 rather than force this drivetrain to bump uglies with a VQ.
"The front of the car would be very heavy if I put an RB26 in a 350Z," according to Koyama-san. "I have developed tuning for the RB26 motor and I don't want to follow other shops which have built 350Zs with RB26 motors. The VQ engine is the principal motor for Nissan," he added. "To develop the engine tuning is very difficult. You must grasp everything about the motor in order to build good tuning engines and that's why I've been building some tuned VQ motors and 350Zs recently."
Koyama-san has proven his mad skills in VQ tuning, having dropped three versions of the mega-powered Stream Z. From this tuning menu he chose the JUN 3.8L custom stroker kit with meaty Cosworth slugs hung on JUN rods. There are all sorts of other sticky-icky JUN items inside the motor such as the prototype camshafts. Flanking the banks of the VQ is a matched set of Trust TD05H turbos. The radiator gets its lean on V-mount style and the dual intercoolers sit on each corner in a hearty attempt to suck in as much fresh air as possible. Sitting atop this mighty combustible is JUN's prototype surge tank intake manifold that could only get more blingy if someone were to spell out JUN in Swarovski crystals. The VQ needs a custom bellhousing to make the Hollinger six-speed sequential gearbox work, as it was originally intended for an R32 GT-R. Finally Koyama-san lists the custom Cusco front differential as one of the hardest pieces to fit onto this puzzle. When all is said and done this incredible hybrid lays down 838 hp with 694 lb-ft of torque.
The massive medley of Nissan parts and the hardware required to send all of this power to two extra wheels must surely pack on the pounds. To this end every unnecessary item was ditched (even the BOSE audio system!). The bare naked Fairlady was stitch-welded and a 16-point cage was added along with lighter-than-an-Olsen-twin carbon fiber hood, doors and hatch. The net result is a car that weighs 2,860 lb (impressive considering the stock Z weighs in at some 3,300-plus pounds).
In its maiden outing at the latest Option2 Time Attack, Kinoshita-san broke the Z in proper like with a 0:57.9-second trip around Tsukuba circuit. Koyama-san thinks the Z can reach a 55-second Tsukuba lap by altering the suspension settings and gear ratios.
But with the AWD VQ, is Koyama-san trying to build a new GT-R? "The Hyper Lemon 350Z is not my vision of what the next generation GT-R should be like," Koyama-san insists. "This Hyper Lemon 350Z is just one of my tuning styles for the Z33." We like your style, Koyama-san.
Hyper Lemon Peeled
The Hyper Lemon 350Z R took JUN one year to build. During that time our very militant buddy, Robert Yukio Kawasaki, was able to sneak into JUN, take some spy shots and then run away shrieking like a little girl. Here's a taste of what Robert saw sans the little shrieking girl soundtrack.
Owner Jun Auto Mecanic
Hometown Saitama, Japan
Daily Grind Making Sweet Lemonade Out Of Hyper Lemons
Power 838 Hp, 694 Lb-Ft
Under The Hood Vq35de; JUN 3.8L custom stroker kit (3772cc, 95.7mm bore, 87.4mm stroke, compression ratio 8.5:1), I-beam connecting rods, billet crankshaft, piston rings; Cosworth pistons; JUN prototype camshafts (10.8mm of lift, 272 degrees of rotation), slide pulley cam gears, valve springs, titanium retainers; stock valves; JUN prototype surge tank intake manifold, fuel rail, exhaust manifold, exhaust muffler; Nissan SR20DET throttle body (x2); Trust TD05H turbine (x2), wastegate (x2), Airinx intake (x2); SARD 1000cc injectors; Bosch fuel pump (x2); NGK spark plugs
Drive Train BNR32 ATTESA E-TS AWD drivetrain; M35 Nissan Stagea AWD front differential case; V35 Nissan Skyline AWD front subframe; hybrid BNR32 Skyline/M35 Stagea front axles; PY50 Nissan Fuga rear suspension arms; JUN adjustable front upper arms; Hollinger six-speed sequential GT-R transmission; Cusco LSD (front and rear); ORC clutch
Brains HKS F-CON V Pro; Trust e-01 boost controller
Stiff Stuff Zeal Super Function R coilovers; SARD front antiroll bar; 16-point rollcage; spot-welded body
Rollers Advan RGII 18x10 +25 offset (front), 18x10 +35 offset (rear); 265/35R18 Advan A048 tires
Stoppers Endless Racing six-piston 380mm (front), four-piston 332mm(rear)
Outside ings N-spec Kai aero kit; SARD GT wing; JUN front diffuser; carbon fiber hood, doors and hatch
Inside Bride Zeta III seat
Ice Percul LAPCOM data logger
Props New York, I love that ghetto girl, she's fabulous!
Connect greddy.com; junauto.co.jp; hksusa.com; mackinindustries.com; more-japan.com; yokohamatire.com
Want More JUN?If you want a touch of the JUN Auto goodness for your ride, More Japan, the official North American importer of all things JUN, can hook you up. The last time we checked, the BNR32 drivetrain conversion for the Z33 wasn't showing up on More's site. Sheesh, what gives?