Where can I get 100 octane gas in San Jose?
07-24-2001, 09:52 AM
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Where can I get 100 octane gas in San Jose?
I think it's somewhere in Almadden but I don't know the exact address.
Does anyone have the exact address on this gas station?
I am also curious if there's any big difference going from octane 92 to octane 91 for our car?
Thanx in advance,
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Does anyone have the exact address on this gas station?
I am also curious if there's any big difference going from octane 92 to octane 91 for our car?
Thanx in advance,
pin
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07-24-2001, 10:54 AM
#8
Here's some information that may help you make your own decisions:
High Octane Gasoline:
Octane ratings measure a gasoline's ability to resist engine knock, a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders.
As a rule, high octane gasoline does not outperform regular octane in preventing engine deposits from forming, in removing them, or in cleaning your car's engine. In fact, the U.S. Environmental Protection Agency requires that all octane grades of all brands of gasoline contain engine cleaning detergent additives to protect against the build-up of harmful levels of engine deposits during the expected life of your car.
A few car engines may knock or ping -- even if you use the recommended octane. If this happens, try switching to the next highest octane grade. In many cases, switching to the mid-grade or premium-grade gasoline will eliminate the knock.
Occasional light knocking or pinging won't harm your engine, and doesn't indicate a need for higher octane. But don't ignore severe knocking. A heavy or persistent knock can lead to engine damage.
Especially in the S4 that has an ECU that monitors conditions and changes things to meet the current state of the car. Increasing the octane should result in a learned increase in performance by the ECU. The ECU should begin advancing the timing until it senses knock again, and monitor at the current rate.
Since the S4 states 91 octane as its minimum, I would suspect that the ECU has a low level operating condition, and if you were to put in say 87 octane, the car would start to knock since the ECU cannot lower itself anymore.
FWIW...
Octane ratings measure a gasoline's ability to resist engine knock, a rattling or pinging sound that results from premature ignition of the compressed fuel-air mixture in one or more cylinders.
As a rule, high octane gasoline does not outperform regular octane in preventing engine deposits from forming, in removing them, or in cleaning your car's engine. In fact, the U.S. Environmental Protection Agency requires that all octane grades of all brands of gasoline contain engine cleaning detergent additives to protect against the build-up of harmful levels of engine deposits during the expected life of your car.
A few car engines may knock or ping -- even if you use the recommended octane. If this happens, try switching to the next highest octane grade. In many cases, switching to the mid-grade or premium-grade gasoline will eliminate the knock.
Occasional light knocking or pinging won't harm your engine, and doesn't indicate a need for higher octane. But don't ignore severe knocking. A heavy or persistent knock can lead to engine damage.
Especially in the S4 that has an ECU that monitors conditions and changes things to meet the current state of the car. Increasing the octane should result in a learned increase in performance by the ECU. The ECU should begin advancing the timing until it senses knock again, and monitor at the current rate.
Since the S4 states 91 octane as its minimum, I would suspect that the ECU has a low level operating condition, and if you were to put in say 87 octane, the car would start to knock since the ECU cannot lower itself anymore.
FWIW...
