I hear you - MegaSquirt seems to be a lot of money to me too. There's got to be another way at the cost of programability and versatility.

All of these electronic systems seem to be capable of adjusting to changing situations - so my guess would be that compression ratio wouldn't make a big difference. I'd be more worried about the trigger points on a crank positioning system and which other sensors would be needed for a particular system to work.

EDIT - there you go look at post #3

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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!