The Grimmspeed Chase JB400 Turbo Kit is a stock location, bolt-on turbo for 2004+ Subaru STi and 2002-2014 WRX. The JB400 is a journal bearing turbo featuring a robust 49lb compressor wheel with a 53mm turbine wheel to offer quick response and power in the mid-range where you need it.
The Chase JB400 was able to hit 440WHP and 460WTQ on The GrimmSpeed Stage 3-equipped 2020 STi with the addition of only tuning and fuel mods. The impressive bit is that the vehicle was able to hold over 400WTQ from 4150RPM, an RPM range where the stock turbo begins to lose power. Compared to a tuned stock turbo STi, the Chase 400 is able to produce 70 more horsepower and 66 more ft/lbs of torque.
The Overtake BB500 Ball Bearing Turbo is also available.
Vehicle Fitment:
2004-2021 Subaru STi
2002-2014 Subaru WRX *Additional mods required for WRX models
Purchase Includes:
Turbo, gaskets, oil lines, water lines and necessary hardware.
JB400 Quick Specs:
• Compressor Wheel Size (Inducer/Exducer): 51.2mm / 73.8mm Extended tip, 48 Trim
• Turbine Wheel Size (Inducer/Exducer): 53.8mm / 47mm, 76 Trim
• Compressor Flow: 49 lb-min
• Compressor Inlet Diameter: 2.4″
• Compressor Wheel Type Material/Alloy: Billet 2618
• Compressor Housing Alloy: A356
• Turbine Housing Alloy: D5S
• Bearing Type: Journal
• Severe duty 360 degree thrust bearing and twin hydrodynamic bearings –very robust for this size of turbocharger, to ensure reliability at high boost levels and in race applications
• Dual piston rings and advance oil flinger design to combat oil leakage and CHRA pressurization
• Compressor A/R: 0.65
• Turbine A/R: 0.88
• Adjustable Wastegate: Pre-set at 15Psi base pressure
