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    Would this work as an Octane test for the 997?

    I wonder about some gassoline stations, if they are really furnishing premium gas when they say so.

    Is it possible to connect computer to the car and check how the engine is responding to the grade of the gas it is getting?

    I guess ignition timing or valve timing would reveal what grade the gas is.

    Would be nice to find out since it seems so easy to rip off the public this way.

    Re: Would this work as an Octane test for the 997?

    I would imagine that with a standard laptop (and the Porsche diagnostic software) you can simply monitor the knock on each of the cylinders. (Seem to remember these engines have individual koock sensors per cylinder?)

    The ignition is retarded by the engine management if the octane rating is too low (pre-detonation would occur). Thus the knock sensors tell it all.

    Generally (In the Uk at least), our 98 RON fuel actually is at least 98. I have a turbocharged car which has been mapped without tolerance to run on lower octane fuel. It is very rare that I get a batch of fuel that is not to the required Octane rating. Though it does happen (My engine management lights flash to warn me!) ;-)

    ...Add

    Re: Would this work as an Octane test for the 997?

    Not sure about the mom's and pop's but I'm pretty sure the biggies (Chevron, Exxon, etc.) require their franchisees to abide by the terms of their franchise agreement. They're regulated and inspected by state agencies as well so I'd be surprised if they'd monkey around with putting regular instead of premium intentionally.

     
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