Quote:
Originally Posted by GH85Carrera
It sucks as a car fuel, as if it designed for aviation engines with 2,400 RPM red line, at altitudes where air tens can be -20.
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This.
Additionally, even 100 & 110 octane race gas (formulated for cars) will not make the difference you probably think it will to the susceptibility of your motor to detonate.
State-of-the-art 40 years ago for a CIS 930-based motor hasn't aged well. There are much better ways now to control fuel/ignition/knock, even while retaining CIS (the real limiting factor/root of the problem). If you've still got the pancake manifold, the 7th injector hack into a manifold designed to run dry is also not considered a great idea - those manifolds are well known to flow unevenly, and fuel distribution wouldn't be ideal. And the period-correct manual boost controller knob is known colloquially as the "dial'o death" for good reason.
Go say "hello" on the 930 forum (and for maximum response, be sure to post some pictures of the car). You'll get expert device from guys that've been tuning and running these cars for a long time. My CIS 930 made 370 at the wheels with great mid-range response from bolt-on mods, safely, for years, on pump gas before EFI. It would never have occurred to me to modify it before hanging out there...