Quote:
Originally Posted by BlaineWasHere
I've never heard of a factory tune that was optimized for 93 (many 91). BUT I've not done research on the factory ECU at all.
Direct injected cars are VERY sensitive to fuel quality due to the size and pressure of the HPFP and I think a lot of people are taking issues related to fuel quality and finding a different reason for them.
My first direct injected car was the VAG 2.0t and if I put fuel in that wasn't Shell/Chevron/ect. it would actaully through a check engine light for "low fuel parameter" meaning the car was thinking it was not getting enough fuel, when in fact the fuel was just inferior. This can make your car run rougher and louder fueling because of the sensitivity of the pump.
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I'll quote from the manual...
Quote:
The engine is designed to operate at maximum performance using
unleaded gasoline with an octane rating of 93 AKI (98 RON) or
higher. If 93 AKI (98 RON) fuel is not readily available in your area,
unleaded gasoline with an octane rating of 91 AKI (95 RON) may be
used with no detriment to engine durability or driveability. However,
you may notice a slight decrease in maximum engine performance
and you may hear some knocking (pinking) of an engine while using
91 AKI (95 RON) fuel. Use of 91 AKI (95 RON) fuel will not affect your
warranty coverage.
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p. 420, BRZ owner's manual.