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Factory timer? Runs for 10 to 30 seconds? Don't think so...
Having owned a couple 930's for the last 25 years, let me say that a turbo timer isn't needed. I have never has an issue with a turbo. I don't run the car hard for the last few miles when returning home, to cool the turbo down a little. Low load, lower rpms, nothing unusual.
The delay in the engine cutting off is this; the fuel pumps are cut off when you turn the key and the ignition is left on for a couple seconds, to ensure any fuel remaining in the engine, as it winds down, gets combusted.
JR
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