Oh yeah forgot to say

1) Data for the turbo can be guestimated from the relationships above

2) This relationship will work for low rpms - below about 2000rpm where the timing device does not start doing its "advance / retard" work

3) This data / method could also eventually used to see the difference in advance / retard operation of the timing device to see if those springs are still doing their jobs after all of these years!

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!