Precision Raceworks MKV Toyota Supra Stand Alone AFS™ – B58 Engine

OVERVIEW

Once you add port injection to a direct-injected GR Supra (B58), the factory low-pressure fuel system becomes the weak link. The factory pump is PWM-controlled to reduce output once target fuel pressure is reached, putting it in constant conflict with any pump trying to feed port injection, and the HPFP's control system dumps fuel back at high pressure/low volume, causing pressure oscillations. The Precision Raceworks Stand Alone AFS™ solves this by adding a completely dedicated, independent fuel system just for port injection.

SPECS

• Fully separate low-pressure fuel system for port injection, independent of the factory pump and PWM control
• Billet aluminum top hat with 3 high-flow fuel ports
• Fully adjustable, 1:1 boost-scalable billet fuel pressure regulator
• 10-micron USA-made Microglass fuel filter, ideal for E85
• Smooth-bore, high-flow PTFE feed and return lines (AN6)
• Pump options: AFS.460 (single Walbro 535, 460 LPH @ 3 bar), AFS.640 (dual Walbro 450s, 640 LPH combined @ 3 bar), AFS.800 (dual Walbro 535s, 800 LPH combined @ 3 bar)
• 100% E85 compatible across all components

PARTS INCLUDED

• Walbro fuel pump(s) per configuration
• Billet top hat and fuel pressure regulator
• 10-micron Microglass fuel filter
• PTFE feed/return lines and fittings
• Configurable pump activation harness

TECH RESOURCES

• Designed for port injection kits where the fuel rail mounts above the manifold — if running a plate-style spacer PI setup, contact Precision Raceworks before ordering to confirm compatibility
• Some fuel rails may require a Male AN8-ORB to Female AN6-ORB adapter (not included)
• Some wiring may need to be cut and spliced to the included connectors during install
• If your tuner wants Solid State Relays, one is needed per pump — see the Solid State Relay Upgrade Kit
• Video installation instructions: PRW MKV Supra Stand Alone AFS install (YouTube)
• Pump activation harness instructions (PDF): Pump Activation Harness Install
• Setting fuel pressure — adjustable regulator (PDF): Setting Fuel Pressure

PART NUMBER

• 601-0333 (AFS.460)
• 601-0387 (AFS.640)
• 601-0332 (AFS.800)

VEHICLE APPLICATIONS