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Engine Swap

RX8 GT3

K24A3 turbo swapped RX8 GT3. Home-made exhaust, full PTFE fueling, Bosch 74mm throttle body, MaxxECU, and a custom carbon dashboard. Built from scratch.

RX8 GT3

Build Specs

  • K24A3 turbo
  • T04E .57 AR
  • Bosch 74mm TB
  • MaxxECU
  • Full PTFE AN fueling
  • Custom carbon dash

The Build

This RX8 GT3 started life with a 13B rotary—190whp, 116,000km on the clock. Phase one was just wheels, pads, and alignment. Then the rotary did what rotaries do, and the real build started.

K24A3 turbo swap with almost everything home-made: exhaust manifold adapter, downpipe, intermediate pipe, full PTFE AN fueling, 3D-printed throttle body adapter and dashboard. Nothing off-the-shelf where we could build it ourselves. The Bosch 74mm throttle body came from a Porsche 997 Turbo—bolted to a Skunk-style intake manifold through our own adapter plate.

This car is the ultimate "figure it out" build. Every problem got a custom solution. The result is a K-swapped GT3 that's faster, lighter, and actually reliable—running a full custom harness, carbon dash, and proper aero. Still evolving.

Build Timeline

Phase 1 — 2022

Rotary Days

Still running the OEM 13B rotary with 116,000km and 190whp. Japan Racing JR-5 wheels—18x8J ET35 front (8.5kg) and 18x9.5J ET22 rear (10kg). Federal 595RS-PRO 200TW tires, 235/35R18 front and 265/35R18 rear. Brembo street pads, aggressive alignment with heavy camber and light toe-in front, toe-in rear.

Phase 2 — 2024

K24A3 Turbo Swap

Full K24A3 turbo swap using the RX8 5-speed gearbox (231hp variant) with PMC Motorsport adapter plate. T04E .57 AR turbo on a cast iron manifold with home-made exhaust manifold adapter, downpipe, and intermediate pipe. 35mm external wastegate, no BOV, MacValve controlled boost. Full PTFE AN6 fueling—Deatschwerks 340LPH pump with install kit, Deatschwerks 1000cc injectors, AEM big volume fuel rail, AEM fuel pressure regulator. Skunk-style RWD K-swap intake manifold with Bosch 74mm motorsport throttle body (Porsche 997 Turbo part) on a home-made 3D-printed 9CS adapter plate. Massive 600x300x76mm front-mount intercooler, full aluminium and silicone 3" turbo piping. Front-mounted 19-row oil cooler, full AN10 lines with thermostatic sandwich plate and HKS short oil filter. Oil catch can AN10. EGT sensor. Simplified cooling system. Valino Pergea 08R 200TW tires. Home-made 3D-printed dashboard holder with Samsung A9+ tablet running custom clusters and tune switches. Home-made adjustable sway bar links. 1-way adjustable coilovers.

Phase 3 — 2026

What's Next

Full custom hand-made engine and car harness, Clubsport+ style. Odyssey PC680 battery with home-made 3D-printed battery holder. K20 oil pump for rev-up (8,800 RPM limit). Home-made carbon dashboard on 3D-printed mould. Front canards. Front splitter, rear diffuser, and wing.

Full Mod List

Engine & Turbo
  • K24A3 swap
  • T04E .57 AR turbo
  • Cast iron exhaust manifold
  • Home-made exhaust manifold adapter
  • Home-made downpipe & intermediate pipe
  • 35mm external wastegate
  • MacValve controlled boost
  • Skunk-style intake manifold (RWD K-swap)
  • Bosch 74mm motorsport throttle body (997 Turbo)
  • 9CS 3D-printed TB adapter plate
  • K20 oil pump (8,800 RPM limit)
Fueling
  • Full PTFE AN6 dash line setup
  • Deatschwerks 340LPH fuel pump + install kit
  • Deatschwerks 1000cc injectors
  • AEM big volume fuel rail
  • AEM fuel pressure regulator
ECU & Electronics
  • MaxxECU
  • Full custom hand-made harness (Clubsport+ style)
  • EGT sensor
  • Samsung A9+ tablet dashboard (custom clusters & tune switches)
  • 3D-printed dashboard holder
Cooling & Oil
  • Front-mount intercooler 600x300x76mm
  • Full aluminium & silicone 3" turbo piping
  • Front-mounted 19-row oil cooler
  • Full AN10 oil lines
  • Thermostatic sandwich plate
  • HKS short oil filter
  • AN10 oil catch can
  • Simplified cooling system
Suspension & Chassis
  • 1-way adjustable coilovers
  • Aggressive alignment (heavy camber, toe-in)
  • Home-made adjustable sway bar links
Brakes
  • Brembo street pads
Drivetrain
  • RX8 5-speed gearbox (231hp variant)
  • PMC Motorsport gearbox adapter plate
Wheels & Tires
  • Japan Racing JR-5 18x8J ET35 front (8.5kg)
  • Japan Racing JR-5 18x9.5J ET22 rear (10kg)
  • Federal 595RS-PRO 200TW — 235/35R18 front, 265/35R18 rear (Phase 1)
  • Valino Pergea 08R 200TW (Phase 2)
Interior & Body
  • Home-made carbon dashboard (3D-printed mould)
  • Odyssey PC680 battery
  • 3D-printed battery holder
  • Front canards
  • Front splitter (WIP)
  • Rear diffuser (WIP)
  • Rear wing (WIP)

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