Funny you should say that, I did that to a large drill about two years ago when I wanted to mill a channel in the surface of a metal plate and didn't have either the right tools or time to take it somewhere, it worked well, but never had the nerve to admit to such rough engineering before!
You got away with it with existing in hand tooling, resourcefulness in the right application for the moment . Sometimes you just have to make do with what you have. A drill can be ground flat bottom like an endmill and can be used carefully to "move" an existing hole going to a larger diameter, carefully being key.
Row 1 (top) is full throttle. Row 12 is throttle shut. IIRC the step between 11 and 12 was to address popping and banging on the over-run. I think the reality with the "red zone", especially at the upper reaches of the rpm range is that it either never goes there at all or spends almost no time there. Certainly that map (or one very like it) worked well for many thousands of miles and was only changed because the engine changed.
Something else that shows a bit (I think there was a later variant which shows it more strongly or it may be the current map as the new engine is much fussier at idle) is the anti-stall - which is additional advance in the top left corner intended to help pick the revs up if it tries to die.
Just create 2 maps one high end of WSM and one racing curve but suspect you wil need a RR session to find the best one!
Then you can just switch on the fly if you want (look out F1)
Plus you can make lots of maps and just save them and once you have one you think is near just keep trying the others as second map
It is different for me I just want a drive able car and good MPG at cruising
I've plotted Centrifugal (top) and vacuum advance curves, from the workshop manual and from GT's book, which doesn't give any vacuum numbers.
But his curves, and he includes several standard as well as this "typical racing curve", which are all quite different from the WSM one, all much, much higher.
And the WSM is a range, indicated by thre upright lines.
The WSM vacuum curve is difficult to translate, into practice as as well as a chart when it says 3.8 - 6.2 in of mercury - "must start to advance". I have presumed from zero towards the 8 degrees for the next step.
All degrees in crank angle.
Welcome to the electronic world were most things do not make sense(its all smoke and mirrors!)
But when you get your head around it it seems to work! (back to smoke and mirrors) if someone asks how it works use some big words and waffle on a bit until they glaze over then you are off the hook!
ps how old are the grandchildren? they would understand if 10 or above!
Not positive for MJL but for MS the standard sensor used is an absolute one with a 0 - 250kPa range, measuring from absolute zero (or somewhere near it) so 0kPa is 0, atmospheric at sea level is around 100 kPa and if you have forced induction you can go up to 1.5 Bar of boost before you need to upgrade to the 400kPa sensor.
You rarely see less than 25kPa in my experience and that's on the over-run at reasonably high rpm. Idle typically in the 40 - 70 range dependent on how wild your cam is.