Subaru EJ257B DUAL AVCS DUAL AVCS CAMSHAFTS
For the 2008 and up Impreza WRX STi, Subaru not only updated the chassis design, but also released a 2.5L engine with dual AVCS featured on both intake and exhaust camshafts. This engine is commonly referred to as the EJ257B platform. The STi is a series of low-volume versions with even greater power and grip were built by Subaru's in-house modifier, Subaru Tecnica International (STi). STi versions of the Impreza, which produced 280 PS (206 kW) from new, are often raced, largely unmodified, in the Group N class in various rally championships to great success. Introduced in 1994, the STi has proven to be a very popular high-performance machine in the Japanese domestic market.
| Stage | Description | Part# | Adv. Dur. | Dur @ .050 | Lift (in) | Lift (mm) | Kit# | Dyno | Price | Shop | Status |
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Street/Strip Specification Plug and play application. Short duration for nice street manners, slight lope at idle. Excellent all purpose spec. OEM spring OK. |
BC0623 | 272°/272° | 222°/222° | .400"/.400" | 10.16/10.16 | BC0600 | $740 |
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Race Specification Longer duration profile, added rpm potential. Intended for fully built engine. Tuning and ECU mods recommended. Requires kit BC0600. |
BC0624 | 280°/280° | 234°/234° | .425"/.425" | 10.80/10.80 | BC0600 | $740 |
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USDM EJ257 (’05-up STi) | Stock | 256°/256° | 204°/208° | .378"/.385" | 9.60/9.78 |
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JDM EJ254 | Stock | 256°/256° | 211°/209° | .374"/.371" | 9.50/9.42 |
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Note: Intake camshafts are setup for AVCS operation. The above cams WILL WORK with AVCS. If running non AVCS setup is desired, you must install the four set screws (located in a plastic bag attached to the cam bag) in the front of each intake cam (do
