Toyota GR Supra & GR86 Tuning Guide
Toyota's GR lineup represents the brand's return to serious performance. The GR Supra shares its turbocharged inline-6 with BMW, while the GR86 uses Subaru's FA24 boxer engine. Both platforms have excellent tuning support and significant potential.
GR Supra (A90/A91)
B58 3.0L Turbo Inline-6
- 2020-2022: 335 HP / 365 lb-ft (A90)
- 2021+: 382 HP / 368 lb-ft (A91)
- Technology: Single twin-scroll turbo, closed-deck block
- Transmission: ZF 8-speed automatic
- Platform: Shared with BMW Z4 M40i
B48 2.0L Turbo Inline-4
- Power: 255 HP / 295 lb-ft
- Applications: Supra 2.0 (certain markets)
- Tuning: Excellent potential, shares architecture with B58
GR Supra Tuning Platforms
MHD Flasher (Recommended for B58)
MHD is the go-to platform for BMW/Toyota B58 engines:
- Smartphone-based flash tool
- Excellent pre-configured maps
- Real-time data logging
- Custom tune support
- Burst mode and anti-lag features
- Multiple map slots
bootmod3 (bm3)
Another excellent option for B58 tuning:
- Cloud-based tuning platform
- OTS and custom tune support
- Excellent data logging
- Professional tuner network
Supra Performance
Supra Performance offers Toyota-specific calibrations:
- Factory engineering background
- Conservative but effective tunes
- Excellent drivability focus
GR Supra Tuning Gains
Stage 1 (Tune Only)
- A90 (335 HP): 400-420 HP
- A91 (382 HP): 420-450 HP
- Improved throttle response
- Better boost curve
- Transmission optimization
Stage 2 (Bolt-Ons)
- Downpipe + tune: 450-480 HP
- Intake + charge pipe: Additional airflow
- Intercooler: Essential for consistent power
- Total: 480-520 HP achievable
Stage 3+ (Turbo Upgrade)
- Upgraded turbo: Pure Turbos, Vargas
- Supporting mods: Fuel system, FMIC
- Power potential: 600-700+ HP
- Built engine: 800+ HP achievable
GR86/BRZ (2022+)
FA24 2.4L Boxer-4
- Power: 228 HP / 184 lb-ft
- Technology: Direct injection, dual AVCS
- Transmission: 6-speed manual or automatic
- Platform: Shared with Subaru BRZ
GR86 Tuning Platforms
EcuTek (Recommended)
EcuTek is the leading platform for GR86/BRZ:
- Full ECU reflash
- Comprehensive table access
- RaceROM features (flat foot shifting, launch control)
- Custom tune support
- Bluetooth data logging
OpenFlash Tablet (OFT)
OFT offers accessible GR86 tuning:
- Pre-loaded maps available
- Custom tune support
- Affordable entry point
- Good community support
MoTeC
For serious builds, MoTeC offers full ECU replacement:
- Complete engine management
- Ideal for forced induction
- Professional tuning required
GR86 Tuning Gains
Naturally Aspirated
- Tune only: 240-250 HP
- Headers + tune: 260-275 HP
- Full NA build: 280-300 HP peak
- Focus on rev limit increase and throttle response
Forced Induction
- Supercharger kit: 350-400 HP (Edelbrock, Sprintex)
- Turbo kit: 350-500+ HP (Jackson Racing, Full-Race)
- Requires supporting mods (fuel, clutch, etc.)
- EcuTek or standalone required
Supra-Specific Considerations
ZF 8HP Transmission
The Supra's transmission responds well to calibration:
- Faster shift times
- Increased torque capacity recognition
- Improved launch control
- Better sport mode behavior
Cooling
- Stock cooling adequate for Stage 1-2
- Intercooler upgrade for track use
- Oil cooler for sustained high-load driving
GR86-Specific Considerations
Header/Exhaust
Headers provide the biggest NA gains:
- Equal-length headers eliminate boxer rumble
- Unequal-length maintain characteristic sound
- Significant mid-range torque improvement
- Required tune for proper calibration
Oil Temperature
- FA24 runs hot under track conditions
- Oil cooler recommended for track use
- Monitor oil temps when tuning
E85 Support
GR Supra
- B58 loves E85
- 50-80 HP gain over 93 octane
- Stock fuel system handles E50-E60
- Upgraded injectors for full E85
GR86
- FA24 responds well to ethanol
- 15-25 HP gain NA on E85
- Essential for boosted applications
- Flex fuel sensor available