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Old 07-15-2003, 04:59 AM   #21
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Hess runs 93 Octane around here for 1.56.She runs pretty damn smooth. My dad put in 87 one time....god did i try to burn that tank fast.
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Old 07-15-2003, 05:00 AM   #22
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Quote:
Originally Posted by willwren
Now it'* 92 minimum. The car doesn't even like 91 any more.
Yeah right.
You're just too good for 91 octane.
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Old 07-15-2003, 05:04 AM   #23
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Busted. You figured me out. I must confess, the only time I run 91 now is if I'm short on beer money.

You spoil ALL my fun.
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Old 07-15-2003, 12:03 PM   #24
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LOL what a riot..
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Old 07-15-2003, 02:22 PM   #25
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Quote:
My car has gotten to the point that I can actually tell the difference between 91 and 93 Octane. With a few mods, things change, and the octane requirement seems to go up. When I first had the car, before any mods, I could actually run 89 and not notice it......but did it rarely.
Thats exactly how the SSEi and GTP are. The SSEi is more so, I think because it isn't intercooled. But the SSEi needs at least 93 octane or else it will run like crap, you can tell the difference between 92 & 93 octane, and definately between 92 & 94. My mom put 94 in the SSEi one day, and I drove the car, and I was like "WTF did you do to this car? It runs damn good!" She was like, all I did was put in 94 octane gas, I thought I was imagining the difference. The GTP runs fine on 92 or 93 Octane, but runs better on 94, and runs damn good on 104 octane. We always put at least 93 in it, and try to put in 94 if at all possible, but I would guess it would run like crap on 89. We could run a 2.8 or 2.9 pulley on the street and run 87 octane with no knock if we wanted to be cheap for long trips, but we don't mind putting premium in, and its nice the have the extra power, because you never know when you might run into a ZO6 or something.
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Old 07-15-2003, 03:35 PM   #26
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hey will its time for 104 octane..LOL....u prolly wish your beer was 93% lol....
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Old 07-15-2003, 04:35 PM   #27
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General question: Do ALL cars run better with higher octane? Including economy cars. You would obviously think so, but I'm sure there is a better answer...there always is.
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Old 07-15-2003, 05:14 PM   #28
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Not necessarily, the higher the octane, the slower it burns. The higher the compression, the more the tendency to "detonate" (burn too fast at the top of the power stroke). That is why we run high octane fuel in a high compression engine. It burns slower, throughout the power stroke.

Now assume you have a low compression vehicle, say a 7.5:1 compression, the lower octane will burn through the entire power stroke just fine, but if we use high octane (we will use 100 octane as an extreme example) in the same engine, the fuel will still be burning during the exhaust stroke, which is wasted engergy. Essentially, part of the combustion is taking place in your headers or exhaust manifolds. Now in our Bonnevilles, we have a computer to help regulate this. The O2 sensor will pick up a rich condition and the computer will lean out the mix. But the O2 sensor will be subject to a shortened life.

There are other variables (such as relative length of stroke--which usually contributes directly with the compression ratio, altitude and air density, etc), but this is the gist of it.
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Old 07-15-2003, 10:04 PM   #29
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Quote:
Originally Posted by dbtk2
Quote:
My car has gotten to the point that I can actually tell the difference between 91 and 93 Octane. With a few mods, things change, and the octane requirement seems to go up. When I first had the car, before any mods, I could actually run 89 and not notice it......but did it rarely.
Thats exactly how the SSEi and GTP are. The SSEi is more so, I think because it isn't intercooled. But the SSEi needs at least 93 octane or else it will run like crap, you can tell the difference between 92 & 93 octane, and definately between 92 & 94. My mom put 94 in the SSEi one day, and I drove the car, and I was like "WTF did you do to this car? It runs damn good!" She was like, all I did was put in 94 octane gas, I thought I was imagining the difference. The GTP runs fine on 92 or 93 Octane, but runs better on 94, and runs damn good on 104 octane. We always put at least 93 in it, and try to put in 94 if at all possible, but I would guess it would run like crap on 89. We could run a 2.8 or 2.9 pulley on the street and run 87 octane with no knock if we wanted to be cheap for long trips, but we don't mind putting premium in, and its nice the have the extra power, because you never know when you might run into a ZO6 or something.
WHere the hell can I find some 94 octane at? The highest I have seen is 93.
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Old 07-15-2003, 10:21 PM   #30
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We have 94 octane at Sunoco. Not sure what is offered in the US...wait Sunoco is in the US

http://www.sunoco.ca/content.asp?id=152

Thats the CDN site tho
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