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View Poll Results: Be honest, What fuel do you use in your SVX
always with Octane 89 or less 0 0%
89, once in a while 91 or better 3 5.45%
always with Octane 91 or better 27 49.09%
91, once in a while 92.5 or better 25 45.45%
Voters: 55. You may not vote on this poll

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  #16  
Old 01-14-2003, 03:24 PM
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Quote:
Originally posted by MacGyver
I always put in Premium, whatever that is around here. I believe it is 92, but maybe 91 since Earl mentioned that.

I 'assumed' that all stations carry the same range and that it is a state thing, but maybe I'm wrong? Would different brands of stations carry different octanes in the same named grade?

Anyway, I always put in 91 or above I guess, since no premium grade is ever less than that anywhere. And everywhere on the car it just says "Use Premium", it says nothing about specific numbers. For those of us without owners manuels.
Here's an interesting FAQ from the Federal Trade Commission:

http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm
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  #17  
Old 01-14-2003, 03:32 PM
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Quote:
Originally posted by Aredubjay


Here's an interesting FAQ from the Federal Trade Commission:

http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm
I KNEW it was "a state thing"!
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  #18  
Old 01-14-2003, 06:13 PM
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Here's an interesting FAQ from the Federal Trade Commission:

http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm
--------------------------------------------------------------------------------
Thanks for the link Ardub, that was what I was talking about.

If we had 91 octaane available here that's what I'd use all the time but since we don't I mix my own. Sometimes I even fill about 2 thirds of a tank with 93, stop the pump, put my credit card back in and finish filling with 89. It's a pain so I usually fill it with 93 and when it gets to half full fill again with 89.
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  #19  
Old 01-14-2003, 08:31 PM
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Here are a few facts from an Ex- Petroleum Bypass Engineer, for those of you who have also performed this job, you know what I mean.

Octane levels are regulated and are always calculated the same way, at the same tempurature. So, the Octain level will always be on the Yellow sticker. If you say you can't find the yellow sticker on the pump, only a white one? Go back to kindergarden and hang some drawings in the window.

Higher octane fuels are generally required for engines with higher (Normally asperate) compression ratio engines. The basic principle is that detonation will occur at a certain preasure, the higher the octain, the higher the preasure before it will detonate(or just spontaniously combust) like all those drummers from Spinal Tap.
Higher octane fuels have other charactoristics, they also tend to burn a little hotter, for all intense purposes. And they burn more controlled(slower).
By burning more controlled they tend to produce more energy more efficiently.
But, they do not always produce more overall energy than a lower octane fuel.

This starting to remind me of "who's on first"

Lets make this easier, SUMMARY:

changing the octain level of fuel you use in your car, changes the torque and horsepower performance curves.
Lower octain will generally give you slightly better bottom end, and higher octane will give you slightly better top end.

Each Manufacturer has tuned their engines and transmissions to match the designed performance curves using their recommended octane levels.

Change the octane = change in performance.
The SVX has a matched Transmission to motor ECU/TCU control system. So its best to use the recommended 91 octane for best performance.

If you have a manual transmission, then learn to use the octane level to your advantage. If you can't control the shift points in your transmission(automatics), then change where the engine hits its highest Torque by adjusting the octane. Go too low, and you get deiselling(detonation). Go too high, and the car shifts before the torque kicks in.

I hope this makes sense. I will admit I have simplified some of this info, but in general, it is correct. If by chance any-one see's a serious error I have commited, well....I'm sure you'll share it.
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Last edited by CDG; 01-15-2003 at 02:36 PM.
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  #20  
Old 01-14-2003, 08:45 PM
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I try not to use gas that has the alcohol added to it. I don't know if it really makes a difference, but I have avoided it in the past. Any thoughts on that issue.
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  #21  
Old 01-14-2003, 09:12 PM
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Alcohol has only one adverse effect, it tends to help strip oil from surfaces. But under the heat and friction of a combustion chamber, and advances computer controls, blah blah blah, it really has no serious side effect anymore. It shoul;d not be a concern.
However, after having said that.
Always remember, the best way to kill your cat is to change its diet.
If you have been avoiding alcohol fuels, continue to do so.
I have not seen any posts from anyone who has talked about excessive wear in the cylinders or any part of the air/fuel chambers. or for that matter any worn out SVX engines.

Does that answer your question?
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  #22  
Old 01-15-2003, 02:39 AM
MartyMcFly MartyMcFly is offline
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Fuel

In Austria we have got 91, 95 and 98 octane.

91 octance are used with cars less than 100 hp.

For my baby I take 95 octane.

98 octane is something special, for cars without KAT I think.

mfg hrc
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  #23  
Old 01-15-2003, 03:59 AM
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Quote:
Originally posted by CDG
Higher octane fuels have other charactoristics, they also tend to burn a little hotter, for all intense purposes. And they burn quicker.
By burning quicker they tend to produce more energy in less time.
But, they do not always produce more overall energy than a lower octane fuel.
Someone else correct me if I'm wrong but I always thought the higher the octane level the slower the fuel burns?

Cheers,
Pete.
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  #24  
Old 01-15-2003, 04:27 AM
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In my area we have 92 & 93 octane. Sunocco also has 94, but I never use it. I use Shell 92 or Amoco /93.
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  #25  
Old 01-15-2003, 10:06 AM
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Quote:
Originally posted by ensteele93
I try not to use gas that has the alcohol added to it. I don't know if it really makes a difference, but I have avoided it in the past. Any thoughts on that issue.
A terrible waste of perfectly good corn squeezin's, in my opinion.
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  #26  
Old 01-15-2003, 11:24 AM
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Quote:
Originally posted by ensteele93
I try not to use gas that has the alcohol added to it.
Sometimes I produce gas that has alcohol added to it.

It's how I get all those clowns out of my Fiat so quickly.
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  #27  
Old 01-15-2003, 11:45 AM
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Quote:
Originally posted by amuse


Someone else correct me if I'm wrong but I always thought the higher the octane level the slower the fuel burns?

Cheers,
Pete.
That's what I thought, too.

I think in minnesota all of our gas has ethanol added to it, and I don't know if it has negative side effects. I always use 93 octane which I can only get at "Holiday" but I'll settle for 92 if I need to get gas somewhere else.

-Aaron
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  #28  
Old 01-15-2003, 02:17 PM
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Quote:
Originally posted by amuse


Someone else correct me if I'm wrong but I always thought the higher the octane level the slower the fuel burns?

Cheers,
Pete.
That's what I thought. The analogy I heard: using octane too low for your engine is like slamming the pedals of your bike at the top of each stroke. A lot of energy is wasted and the engine doesn't like it and knocks. Higher octane burns slower more like applying smooth pressure to your pedals all the way down.
Again way oversimplified but that way I can understand it.
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  #29  
Old 01-15-2003, 02:33 PM
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Perhaps I can rephrase it this way.
Higher Octane fuel is a more controlled burn, and you are correct it burns longer, therefore slower, therefore providing a longer power stroke, therefore able to have a more advanced spark.

Its tricky, as fuel injection controls the burn time.

the essence is this:
The ECU is tuned to burn 91 Octane, more or less can be adjusted for, but the extremes can cause problems. Many other factors effect the burn, thats why some can use 89 Octain without knocking, where some have to run higher to avoid knocking.

My appologies for my mistake.
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  #30  
Old 01-15-2003, 02:52 PM
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i use moms special recipte go go juice gas..


all i know is turbo cars, 20 psi or more 107-110 octane senoco fuels =>


but my svx baby always gets 93 here in florida.


bye the way whene is the gas prices going to get lower !!!!
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