170 amp S series racing alternator for Toyota 2JZS Series The S series of 6 phase alternators offers incredible output in a compact and durable package. Highly efficient, these units use less horsepower per Kw of power produced than conventional 3 phase alternators. 12 diodes, twin rectifier plates and outstanding airflow ensure long service life, even in severe conditions. This unit comes equipped with a standard diameter pulley, making it a perfect choice for high RPM and racing applications.