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Originally Posted by full quack
Um...1 bar is equal to 14.7 psi, not 10psi.
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Yup.
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All of these cars show scary low pressure readings on the factory gauge, at idle with the oil at full temp.
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My 3.3 shows about 20-25 PSI on the factory gauge at idle with the oil at full temp. But it's set to idle at 1050, because it prefers that with the SC cams and my cam/ignition timing - idle can be pretty lumpy otherwise...
Pretty sure the 74-77 930's got the exact same pump as the middie 911's - e.g. bigger than earlier cars. I've read that the 60's cars can light the oil pressure idiot lamp at idle when hot, and that's considered "normal" for them, on a "so long as it goes out when you rev it" basis. That's also expected for the 2.0 924. Don't know if the 911 got a pump upgrade between the 60's and the middies - don't remember noticing one.
Could be wrong, but I seem to recall that the idiot sensor trips at 6 PSI....