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I would also assume that running at higher revs on the track, the oil pressure would also be much higher than driving on the road, which in turn would force the engine oil into (and out of) the sealed IMS bearing.
When I ran my Mazda MX-5 (Miata in the US) on the track with the engine above 6,000rpm, the oil pressure gauge registered 5 bar (70psi), while driving on the road @ at 3,500 rpm the gauge registered about 4 bar (56psi) - a signifcant increase at higher revs. I can't see the plastic / nitrile IMS bearing seals withstanding 70psi hot oil pressure for long without letting some flow-through occur.
Perhaps thats why Boxsters driven "as they were intended to be driven" have a longer lifespan than the mollycoddled cars.......
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
Last edited by Steve Tinker; 05-02-2010 at 08:24 PM.
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