View Poll Results: What kind of gas do you use?
91
547
41.66%
92
68
5.18%
93
612
46.61%
I'll put anything in there CHEAP!
86
6.55%
Voters: 1313. You may not vote on this poll
The mother of all 2IS gas discussions. Premium or Mid-grade (merged threads)
08-24-06, 10:00 AM
#185
But i agree wtih most of you. The difference is small and if you're not filling up more than once a week, IMO, premo fuel isn't that much more a month to regular/mid-grade.
08-24-06, 12:21 PM
#186
Let's see here...when the pcm detects spark knock from lower octane fuel it adjusts the timing accordingly so detonation does not occur and therefore no damage is done, so my ? to you is what exactly is gonna break and cost all this money to fix? I myself use the highest octane available but not because something is gonna break if I don't.
08-24-06, 12:36 PM
#187
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Read the manul in the rear section, they recommend 91 or higher, also the manual advised excessive pinging can damage your engine,
the computer will retard timing and you do have a knock sensor to prevent mis-firing, but it will affect performance
the computer will retard timing and you do have a knock sensor to prevent mis-firing, but it will affect performance
08-24-06, 01:32 PM
#188
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Octane is a measure of how easy or difficult the fuel is to ignite; the higher the octane, the more difficult the fuel is to ignite, the lower the number, the fuel is eaiser to ignite.
OK. Therefore, when the knock sensor detects knocking, it will adjust the timing to compensate for the knock, but due to the high compression ratio, it can only adjust the timing up to a point. If the octane is too low (eaiser to ignite), the fuel will ignite due to high compression before the spark and you will have knocking.
Shock waves are created when an engine has pre ignition or knock.The knocking sound you hear from outside the car is actually the sound of those shock waves hitting the cylinder walls in your engine.
My advice to you, then, would be if you think $3-$4 per tank is killing your wallet now, just wait until you get the bill for the engine damage caused by driving for thousands and thousands of miles with shock waves hitting your cylinder walls.
If you cannot afford premium fuel, then I would recommend trading the car for one which burns 87.
08-24-06, 01:54 PM
#190
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To further elaborate...
If you know how car engines work, you know that almost all cars use four-stroke gasoline engines. One of the strokes is the compression stroke, where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug. The amount of compression is called the compression ratio of the engine. A typical engine might have a compression ratio of 8-to-1.
The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.
The compression ratio of your engine directly determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs more.
-from HSW
If you know how car engines work, you know that almost all cars use four-stroke gasoline engines. One of the strokes is the compression stroke, where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug. The amount of compression is called the compression ratio of the engine. A typical engine might have a compression ratio of 8-to-1.
The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.
The compression ratio of your engine directly determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs more.
-from HSW
08-24-06, 02:14 PM
#191
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08-24-06, 04:02 PM
#192
To further elaborate...
If you know how car engines work, you know that almost all cars use four-stroke gasoline engines. One of the strokes is the compression stroke, where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug. The amount of compression is called the compression ratio of the engine. A typical engine might have a compression ratio of 8-to-1.
The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.
The compression ratio of your engine directly determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs more.
-from HSW
If you know how car engines work, you know that almost all cars use four-stroke gasoline engines. One of the strokes is the compression stroke, where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug. The amount of compression is called the compression ratio of the engine. A typical engine might have a compression ratio of 8-to-1.
The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites. When gas ignites by compression rather than because of the spark from the spark plug, it causes knocking in the engine. Knocking can damage an engine, so it is not something you want to have happening. Lower-octane gas (like "regular" 87-octane gasoline) can handle the least amount of compression before igniting.
The compression ratio of your engine directly determines the octane rating of the gas you must use in the car. One way to increase the horsepower of an engine of a given displacement is to increase its compression ratio. So a "high-performance engine" has a higher compression ratio and requires higher-octane fuel. The advantage of a high compression ratio is that it gives your engine a higher horsepower rating for a given engine weight -- that is what makes the engine "high performance." The disadvantage is that the gasoline for your engine costs more.
-from HSW
08-24-06, 04:05 PM
#193
08-24-06, 05:53 PM
#194
Lexus Test Driver
i thought you had to get it somewhere special. im in san diego, and everything here is 91 for premium except for one gas station like 30-40 min away with 97 or something. how much does stuff like that go for? i mean its like $3.20 for 91 and we're the most expensive in the country i think...
08-24-06, 06:11 PM
#195
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I started the post and agree it is not worth 4 bucks a tank to even risk issues. What is 4 bucks when u just spent 40 g"s. But I started the post because I aked for a fill of 93 on my second tank ever of gas in the NEw car and the guy didn't iunderstand english and used 87. I freadked and wondered what is any damage might have been done in one tank. I guess nothing as long as you don't always fill with the cheap stuff.