Description
Spool Performance A90 / A91 Toyota Supra Auxiliary Split Fuel System
The Spool Performance A90 / A91 Toyota Supra Auxiliary Fuel System is engineered for Supra owners pushing beyond the limits of the factory fuel system. Built around the B58 platform, this system delivers stable, predictable fueling at higher power levels through proper DI and PI fuel separation while maintaining clean, OEM-style integration.
Every component is designed for real-world usability, long-term reliability, and straightforward installation without unnecessary complexity.
Why a Split DI + PI Fuel System Matters
As power increases on the B58-powered Supra, combining direct injection (DI) and port injection (PI) on a single fuel feed creates instability:
- DI pulse cycles can introduce pressure fluctuations affecting PI injectors
- PI requires boost-referenced pressure for consistent fuel delivery
- Higher boost levels make fueling less predictable
By separating DI and PI supply:
- Each system operates independently
- Fuel pressure remains stable under load
- Fuel delivery becomes consistent and repeatable at high power
Key Features
- True split DI and PI fuel system architecture
- Retains OEM fuel pump top hat using precision aluminum fittings
- Plug-and-play wiring harness compatible with Reflex controller
- Dual Walbro 450 fuel pumps included
- Optional Walbro 525 upgrade available
- Choice of standard relay or solid-state relay (PWM control)
- Compact, boost-referenced fuel pressure regulator
- Triple-layer PTFE fuel lines for durability and ethanol compatibility
Clean OEM-Style Installation
- No repinning or modification of factory wiring required
- Direct integration with OEM fuel pump top hat
- Optional billet top hats available separately
- Designed for clean, factory-like engine bay fitment
High-Quality Fuel System Components
- PTFE inner core for full fuel and ethanol compatibility
- Stainless steel reinforcement for high-pressure strength
- Nylon outer layer for abrasion resistance
- Built for high-heat, high-vibration environments
Scalable Performance
- Dual Walbro 450 pumps support high horsepower builds
- Optional Walbro 525 pumps for extreme setups
- Flexible control options for precise fuel delivery
- Designed to grow with your Supra build
Performance Benefits
- Stable fueling at high boost and power levels
- Improved reliability for high-performance applications
- Consistent fuel pressure and delivery under load
- Supports large turbo and port injection setups
- Maintains drivability while increasing fuel capacity
FITMENT
Toyota GR Supra A90 (2020–2021)
- 3.0 / 3.0 Premium (B58 Inline-6)
- 2.0 (B48 Inline-4)
Toyota GR Supra A91 (2022–2023)
- 3.0 / 3.0 Premium (B58 Inline-6)
- 2.0 (B48 Inline-4)
Additional Notes:
- Professional installation recommended
- Compatible with Reflex controller systems
- Designed for high-performance street and track builds
- Ideal for upgraded turbo and high-boost applications
Upgrade your Toyota Supra with the Spool Performance Auxiliary Split Fuel System for maximum fueling control, scalability, and reliability as your build reaches higher performance levels.
