HKS GT2 Supercharger System w/ ECU Package - 2013-2016 Scion FR-S / 2013-2020 Subaru BRZ / 2017-2019 Toyota 86

GT2 Supercharger System with ECU Package for the FR-S, BRZ, and 86

The HKS GT2 Supercharger System with ECU Package for the 2013-2016 Scion FR-S, 2013-2020 Subaru BRZ, and 2017-2019 Toyota 86 is the complete forced induction solution. The GT2 supercharger system plus the HKS Velocity Advanced Computer ECU calibration package bundled together. The ECU package is what separates a complete, properly tuned supercharger installation from a kit that needs additional calibration work. The bundle provides everything needed for a safe, optimized GT2 installation in one purchase.

Specs & Highlights

• GT2 twin-screw supercharger system
• HKS Velocity Advanced Computer included
• Complete ECU calibration package for GT2 installation
• Everything needed for a properly tuned GT2 build
• Immediate boost delivery from low RPM
• Requires professional installation
• Fitment: 2013-2016 Scion FR-S / 2013-2020 Subaru BRZ / 2017-2019 Toyota 86

GT2 Kit Plus Base Map Pre-Loaded on Velocity Computer

The GT2 kit with ECU Package includes the Velocity Advanced Computer pre-loaded with HKS's base map for the standard GT2 pulley ratio at approximately 7–8 psi boost. The base map targets a lambda of approximately 0.88–0.91 at WOT on 91 octane (RON 96) fuel, with conservative ignition timing that provides a safe starting point for dyno refinement. Peak power on the base map without further tuning is approximately 210–220 whp; a professional tune targeting the engine's actual knock threshold typically yields 228–240 whp on premium fuel.

What the ECU Package Provides vs the Kit Alone

The ECU package addition is significant. A supercharger system without proper calibration runs rich at best and damages the engine at worst. The factory ECU is not calibrated for boost and requires recalibration to manage the additional fuel and ignition requirements correctly. The HKS ECU package provides the Velocity Advanced Computer hardware and a base calibration developed by HKS specifically for the GT2 system.

Still Requires Professional Dyno Tune to Finalize

Professional installation is still required, the ECU package is not a self-tuning system. It provides the hardware and the HKS-developed base map, which a qualified installer can then finalize on a chassis dyno for your specific build. The base map is a starting point calibrated for the GT2 system at its standard configuration.

The FT Breakdown

The GT2 with ECU Package is the complete GT2 build in one kit. It is the straightforward way to buy into the HKS supercharger system without separately sourcing the ECU management piece. For first-time forced induction builds on the FA20, the all-in-one bundle eliminates one source of uncertainty from a complex project. The base map's 0.88–0.91 lambda target at WOT on 91 octane is conservative enough to be safe on a fresh installation while leaving meaningful performance on the table for a professional tune to recover. HKS built in that margin intentionally — a base map that pushes to the knock threshold on a brand-new installation has no room for the variation between individual engines and fuel batches. The professional tune is where the GT2's full capability is realized.