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2005 987S power steering and UNDERDRIVE PULLEY


Vehicle Information: Model (Boxster, Boxster S,Cayman, Cayman S): Boxster S; Year: 2005; Engine (type, size, modifications): 3.4; Total Mileage: 49,300; Transmission: Manual;

Not a question. But have significant experience with underdrive pulley as replacement on for maincrankshaft pulley. My 2005 987S is a daily driver with 4 track seasons (8-10 days) per year. By the end of the first two seasons, each year developed power steering fluid leak, once at rack end and once at pump. Melted fittings both times, with slow leaks after track, running on MPSC. Lines and fittings replaced 2 times by dealer under warranty. Had underdrive pulley put in by Farnbacher at beginning of 2006 season, no problem ever again. It does not affect the function or feel of ps, even with parking. 20,000 miles of regular driving since switch and 25 track days. It theoretically works by underdriving all components attached by serpentine belt, therefore slowing down the power steering pump at high rev driving.

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