Quote:
Originally Posted by adarvasi
I did change the springs and made all the difference!
I also changed the engine, just before de rally installed a 1967 B18B; tested the car up to 150 kph and it runs smoothly and no vibration whatsoever. Big difference between 8000 feet and sea level
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The rather crude rule of thumb is that you lose an average of about 3% of your rated horsepower per 1000 ft increase in altitude above sea level. On top of that, most carburetor equipped engines start to run with rich fuel mixtures as the altitudes increases which further compromises performance. The loss in horsepower and over fueling may actually be a good thing because your cooling system also suffers reduced capacity because of the lower mass air flow through the radiator at higher altitudes.
When you did the engine switch, perhaps you should have switched to a B230 FT or something similar. A turbocharger mixed with some EFI would have helped with the altitude problem. However, I suspect that would have violated the '1980' rule.