6.17 Can I tune the engine to use another octane fuel?
Description
This article is from the Gasoline FAQ, by Bruce Hamilton with numerous contributions by others.
6.17 Can I tune the engine to use another octane fuel?
In general, modern engine management systems will compensate for fuel
octane, and once you have satisfied the optimum octane requirement,
you are at the optimum overall performance area of the engine
map. Tuning changes to obtain more power will probably adversely
affect both fuel economy and emissions. Unless you have access to
good diagnostic equipment that can ensure regulatory limits are
complied with, it is likely that adjustments may be regarded as
illegal tampering by your local regulation enforcers. If you are
skilled, you will be able to legally wring slightly more performance
from your engine by using a dynamometer in conjunction with engine and
exhaust gas analyzers and a well-designed, retrofitted, performance
engine management chip.
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