Tegiwa’s Toyota GT86 with a 4Piston K24

Tegiwa purchased a JDM-spec Toyota GT86 with 300,000 km (186,411 miles) on the odometer. The company used their experience in racing and Honda performance to rebuild the coupe for rally.

In the engine bay Tegiwa replaced the tired factory 2.0 L FA20 flat-four for a 2.5 L Honda K24 inline-four built by 4Piston Racing. The “K24-K400” motor features ductile iron sleeved block with 99 mm stroke and 89.5 mm bore. It uses 4Piston I-beam rods, 4Piston / Wiseco forged Ultra lightweight pistons, 4Piston ported oil pump, and KPower baffled oil pan and stainless steel header.

On top is a 4Piston Pro 163 head with 4Piston valves, Ferrea PAC HD valve springs, 4Piston billet RR4 iVET camshafts, and KPower intake manifold. The motor made 302 hp (222 kW) and 212 lb-ft (287 Nm) of torque restricted by the GT86 65 mm throttle body. Tegiwa is upgrading to a Bosch 82 mm throttle body to increase airflow and power.

Tegiwa installed the Honda motor using a KPower Industries swap kit. The kit came with mounts, oil pan, intake manifold, 4-2-1 stainless steel exhaust header, fuel rail, and starter blockoff plate. It also had a K24/86 transmission adapter, steel flywheel, and mount to use the factory six-speed manual transmission.

The car’s suspension for prepped for racing using Hardrace chassis braces and control arms. Tegiwa installed a set of Yellow Speed Racing two-way adjustable rally spec coilovers to handle bumps. Behind the Yokohama A051T 215/45 tires mounted on Braid 17×8-inch wheels are Yellow Speed Racing six-piston brakes.

Tegiwa stripped the interior of the factory seats, electronics, and plastic trim. The driver will sit in a RRS Control Carbon seat in front of a Personal Neo Grinta 330 mm steering wheel protected by a Safety Devices roll cage and OMP fire suppression system. Engine data is displayed on a Haltech IC_7 digital dash controlled by a Haltech Elite 150 ECU. You can read more about the car and the build process on the project blog.