100 octane: is it good for miata?
#8
Slowest Progress Ever
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100 Octane will destroy your engine. Especially if you run Unleaded Only. I only run leaded fuel, the lower the octane, the higher the lead. The lead will lubricate the cylinders thus making your car faster. Every 5 octane numbers that you go down = the same effect as 1 psi of boost.
If you're making 0 boost on 87 octane, 72 octane with lead additive will produce 3 psi with no turbos or nos.
If you're making 0 boost on 87 octane, 72 octane with lead additive will produce 3 psi with no turbos or nos.
#12
100 Octane will destroy your engine. Especially if you run Unleaded Only. I only run leaded fuel, the lower the octane, the higher the lead. The lead will lubricate the cylinders thus making your car faster. Every 5 octane numbers that you go down = the same effect as 1 psi of boost.
If you're making 0 boost on 87 octane, 72 octane with lead additive will produce 3 psi with no turbos or nos.
If you're making 0 boost on 87 octane, 72 octane with lead additive will produce 3 psi with no turbos or nos.
#15
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Ok, folks. The OP does not live in an English-speaking country, nor in a place which uses the same rating systems and conventions to describe gasoline as we do in Canada / the US.
kimkim, yes, it is safe to run 100 octane fuel in the Miata so long as:
1: It is unleaded, and
2: It does not contain a high concentration of alcohol. (10-20% is fine.)
If the fuel is leaded, then it will cause gradual degradation of the catalytic converter and the O2 sensor.
If the fuel contains a high percentage of alcohol, then it might cause damage to certain rubber or plastic components of the fuel system, however this is not likely to occur in a short period of time.
There is no benefit to running 100 octane fuel as opposed to regular unleaded fuel (87 R+M/1 or 91-92 RON) unless your engine is specifically built for this, such as having a very high compression ratio or being turbocharged to a very high pressure.
#18
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Whether this is a practical concern today with commercially-available gasoline is something I honestly don't know.
#20
It is theoretically possible, depending on what chemicals were used to boost the octane. If the act of raising the octane causes the energy density of the fuel to be decreased, then yes, you will make less power burning high octane fuel in a low compression engine than you would with a fuel that, by way of not having been diluted by octane-enhancing compounds, has a higher energy density.
Whether this is a practical concern today with commercially-available gasoline is something I honestly don't know.
Whether this is a practical concern today with commercially-available gasoline is something I honestly don't know.