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Ny Shell 99 oktan..


tommy_sn

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2.5.3 Q: Why do the two engines have different octane recommendations?

Does using higher octane give more power?

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A: SOHC and DOHC engines have different engine controller programming. The DOHC, due to its more aggressive tuning, is calibrated for 92 octane, while the SOHC is optimized for 87 octane.

 

Both engine controllers have a knock sensor, and will retard the spark timing if detonation (or "pinging") is encountered due to running lower-octane fuel. However, the controller will not advance the spark beyond its original setting, so using fuel of higher octane rating than recommended above gives no performance advantage.

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