Thirty years ago Kazuhiro Fujioka was introduced into the motorsports world through rally racing. Since then he's gone through every type of racing. While still racing Fujioka started the Auto Produce Boss shop to share his racing knowledge and experience. AP Boss has grown such popularity and trust, that they have been contracted to build several D1 competition cars as well as help with Super GT cars. The RS*R Supra driven by Manabu Orido, is just an example of the level of cars that they put together.
Being the owner of AP Boss, Fujioka has several cars in his stable. Having a long history with the Silvias, keeping one on hand for testing new products or motor break-ins is imperative. Right after Fujioka sold his white S15 he quickly decided another one had to be built in its place. "Having both success in time attacks and drifting, we wanted to build a test bed for our engine program. We feel that the engine in this car can be well-suited for both drifting and circuit. Our main focus is having an adequate amount of power as well as response." Having just over 400whp is definitely all that one would need on the drift and time attack circuits.
Underneath the SR20DET gets the full Toda 2.2L stroker kit treatment, a 92mm stroke crankshaft, 87mm pistons and forged connecting rods. Up above, the head gets a top-off with a set of JUN camshafts, tuned with a set of the infamous purple HKS gears. An HKS 30ProS 56T turbo is mounted via a tubular Boss manifold. A Boss intake manifold sits on the other side of the head, with a set of LAP (Boss' product brand) injectors, all helping to achieve that remarkable 438ps. One of the more particular parts on the car, no not the 6-speed NISMO transmission, is the Yashio Factory pink radiator. I've often wondered what's the deal with these units. Boss tells us that copper cores make for better radiators than aluminum cores. Although aluminum end tanks are more durable, plastic ones will do just fine for the car's purpose. The more efficient decapitation of heat through the copper core was more desired over the aluminum versions.
Now that the car is done, Boss plans to use the car for testing new parts or even breaking in newly-built SR20DET engines, before sending motors out to customers and race teams. Maybe I can convince Boss to send me a crate SR20DET motor for my S14. Fat chance, I think!
Fast Facts
2001 Nissan Silvia Spec-R (S15)
Owner Kazuhiro Fujioka
Hometown Nagano-Shi, Japan
Daily Grind Gangster and owner of auto produce bossPower 438ps
Under The Hood 2.0L SR20DET; Toda Racing 8.4:1 87mm pistons, rods and 92mm 2.2L crankshaft; JUN camshafts; Auto Produce Boss 70mm intake manifold, turbo manifold, intercooler piping, NVCS adjustable cam pulley and Type II 90mm titanium exhaust; Z32 MAF; LAP 850cc injectors; Nissan R32 GT-R fuel pump; Blitz filter; Nissan Pulsar N15 70mm throttle body; HKS cam gears and 30ProS 56T turbo; Yashio Factory catalytic converter, Tenka ignition and copper core radiator; NGK R7434-8 spark plugs; NISMO engine mounts
Drivetrain NISMO 6-speed transmission and copper mix clutch
Brains Blitz SBC i-Color boost controller
Stiff Stuff Prodrive coilovers; NISMO bushings
Rollers 18x9.5" +15 Prodrive GC-07J (front/rear); 255/35R18 Bridgestone RE-11 (front), 265/35R18 Bridgestone RE-11 (rear)
Stoppers Factory aluminum 4-piston front and 2-piston rear calipers
Outside GP Sports body kit; Spec-R spoiler
Inside Bride Gias-II seats and upholstered door panels; Blitz gauges; Prodrive harness and horn button; Vertex steering wheel; Yashio Factory shift knob
Props Phi Phung, you know you love the scene!
WWW apboss.com; blitzperformancesales.com; hksusa.com; junauto.co.jp; more-japan.com (Bride); todaracing.com