1988 Twin Turbo RWB 930 Kyoukishi

Overview

  • “Kyoukishi” is a hand-built RWB by Akira Nakai, blending classic air-cooled Porsche character with a modern twin-turbo setup
  • Built for presence, sound, and raw driving experience
  • Name meaning: Kyoukishi (狂騎士) — “Mad Knight” / “Frenzied Warrior”

Chassis

  • 1988 Porsche 911 Carrera (G50)
  • Air-cooled platform
  • Rear-engine, rear-wheel drive
  • Converted to Rauh-Welt Begriff (RWB) widebody in 2013

RWB Conversion (Akira Nakai)

  • Hand-built by Akira Nakai, founder of Rauh-Welt Begriff (RWB)
  • Signature RWB widebody (RSR-inspired)
  • Riveted overfenders front and rear
  • Custom front bumper and aero
  • Fixed rear wing
  • RWB windshield banner
  • Built with Nakai-san’s one-off fitment and styling approach

Engine

  • Air-cooled flat-six (3.2L Carrera base)
  • Bisimoto twin-turbo setup
  • Custom turbo system and exhaust
  • Standalone engine management (MoTeC)
  • Methanol injection system (relocated to smugglers box)
  • High-performance fuel and ignition system

Drivetrain

  • G50 5-speed manual transmission
  • Rear-wheel drive
  • Performance clutch and drivetrain components (built for turbo application)

Suspension

  • Factory torsion bar rear suspension (retained)
  • Upgraded adjustable shocks (Bilstein-style)
  • Adjustable rear sway bar end links
  • RWB stance-focused setup

Brakes

  • Brembo performance brake system
  • Cross-drilled rotors
  • Recently resurfaced front rotors
  • System serviced and refreshed

Wheels & Tires

  • Bombacher multi-piece wheels (RWB spec)
  • 18-inch fitment
  • Extremely wide rear setup
  • ~15” inner rear barrel measurement
  • Polished lips with exposed hardware
  • Performance tires

Electrical

  • 12V system
  • New AGM battery
  • Updated battery cables and cutoff wiring
  • Charging system tested and verified
  • Modern wiring supporting standalone ECU

Interior & Tech

  • Porsche Classic head unit
  • Wireless Apple CarPlay
  • Upgraded rear speakers
  • Cleaned and updated wiring throughout

Service & Baseline (Modern Air Cooled – Houston)

  • Full compression and leakdown test
  • Valve adjustment completed
  • Fresh oil service (Brad Penn 20W-50)
  • Transmission serviced (Swepco fluid)
  • Alignment performed
  • Tires road force balanced
  • Electrical systems sorted
  • Pedal assembly corrected
  • Sunroof seals replaced and system refreshed

Current Status

  • Fully running and driving
  • Electrically stable and reliable
  • Sorted for street driving, events, and continued development