HKS 13-20 Subaru BRZ FA20 2.1L Low-Comp Step 2 Full Kit (Forged Pistons, I-Beam Con Rod, Crankshaft) (21004-AT004)
The supercharger upgrade for the FA20 engine has significantly raised the level of tuning, sometimes surpassing the conventional forged connecting rod’s allowable torque limit (approximately 700 N.m). To handle this higher output and torque, the I-beam billet connecting rod, originally developed for TRB-03, is now available. This rod increases buckling strength by about 30% compared to standard forged rods, delivering exceptional performance under extreme conditions.
Remarks: Capacity: 2091, Type: D86.0-22, Boring/Honing modification: Not required, Full flow modification: Not required, FORGED PISTON KIT + I-BEAM CON'ROD + FORGED CRANKSHAFT, Box#2: 440x360x225(Crank) 13kg
Applications
- Subaru BRZ FA20 (2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020)
Features
POINT-1 Piston
- Forged material improves durability.
- The cavity is designed in piston crown to optimize the atomization of fuel during injection.
- 3D Piston crown design to optimize tumble flow.
- The piston is recessed to match high lift HKS camshafts.
- The compression ratio range is widened depending on the gasket's specification.
- Molybdenum coated pistons reduce friction.
POINT-2 Connecting RodsSTEP1
- Cracked connecting rod is chosen for the long stroke. The big end size is designed to omit modification of the engine block. (Nissan genuine bearing for RB26 and SR is required separately)
- Highly durable I-beam and cracked connecting rod are included. The connecting rod bolt size is optimized.
STEP2
- The thickness was optimized by strength analysis. The weight increase was minimized, and the strength was increased by approximately 30%.
- I-beam shape was selected to increase the buckling strength.
- The ideal shape was realized, and the fracture origin on the surface was eliminated by forged billet manufacturing. To improve fatigue strength, strong shot peening treatment is carried out on the surface.
- The optimum heat treatment for chrome molybdenum steel was carried out to improve both strength and toughness.
POINT-3 Crankshaft Stroke 90.0m
- The crankshaft is made from forged materials.
- Bespoke pin journal size is employed.
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HKS 13-20 Subaru BRZ FA20 2.1L Low-Comp Step 2 Full Kit (Forged Pistons, I-Beam Con Rod, Crankshaft) (21004-AT004)
