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Joined: May 2002
Posts: 1,379
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: May 2002
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Originally posted by drew8819:
I have a 99 CSVT and Ive been running 93, would I be better off just using 91 since you guys were saying our cars arent made for that high of octane rating?
Considering that you live in Florida I would run 93 because of the heat, just to be safe. I always run 93 in mine and Im in Michigan.
~~~~~~Mike~~~~~~
Black 2006 VW Rabbit
Silver 2000 Contour SVT - SOLD
~~~~ The Car~~~~~
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Joined: Sep 2001
Posts: 155
CEG\'er
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CEG\'er
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High octane does not hurt (excluding 96+), but if you engine doesn't need it, you are possibly just wasting money. Stock SVTs need 91-ish. (presumably 98s a little less, 00s a little more, and 99s in the middle) They automatically retard the spark (reducing power) if the ecu determines there is predetination (knock). Many modern cars do not audibly or noticably knock. The car can detect in less than 2 revs a knock situation, and correct it in the next spark.
There is an "old car guys" tale of high octane running hotter and burning up cars. It is simply not true. It probably comes from the fact that high octane is needed for high boost / high compression situation, in which the engine inherently runs hotter.
Oh and the guy fillingup his '79 hooptie with premium (cause I want to treat my car nice), needs a visit from the wallet inspector. ("Hey, that's not the wallet inspector.")
In response to the first post, the 94 octane is a placebo. You have been fooled by the power of suggestion.
Geoff C. Turner
99 Black SVT -mine
99 Blue SE V6 ATX -mom's
96 Black SE MTX -sister's
All with 278mm front rotors
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New CEG\'er
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'99 Silver SVT
Quaife LSD
Centerforce DF
B&M Short Shifter
DMD
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Joined: Sep 2002
Posts: 6,106
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Addicted CEG\'er
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I don't know where everyone is getting off saying how 94 octane is bad for our cars. Basically every gas station around here has 93 Octane and then there are also quite a few that have 94. I usually put the 93 in but use 94 about 1/3 of the time. I don't notice a bit of difference in performance. I like to use the 94 because I seem to get a little better gas mileage. As for it making the car a rocket I'm not so sure about, but I don't see it hurting the car at all. But then again I have a 2000 so maybe I'm wrong.
2000 Black CSVT
3.0L Hybrid - 206fwhp & 195fwtq
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Joined: Mar 2003
Posts: 2,676
Hard-core CEG\'er
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Hard-core CEG\'er
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Originally posted by geoffct:
They automatically retard the spark (reducing power) if the ecu determines there is predetination (knock). Many modern cars do not audibly or noticably knock. The car can detect in less than 2 revs a knock situation, and correct it in the next spark.
I have been able to hear the knock when I ran 87 octain, so it wasn't able to retard the spark at all.
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Joined: Jan 2002
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We have to use higher octane in our cars because the engines are such high compression. When using lower octane fuel, the fuel ignites at a lower temperature, sometimes without the spark, and before top dead center. If this happens, then you get pre-ignition, and you hear the knocking sound. That why deisel fuel is like 56 octane (something like that) and deisel engines don't have spark plugs. the fuel ignites because of compresion.
99 CSVT - green : SOLD
99 CSVT - Green : SOLD
Supercharged Mustang - fire
...
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Joined: Nov 2002
Posts: 3,506
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Originally posted by geoffct:
High octane does not hurt (excluding 96+), but if you engine doesn't need it, you are possibly just
Actually 96+ Octain does not hurt your car....its just a waste of money because your car cannot use it. So you can run 96 all day and it will only be as good as the 93 (91 here) that you fill up with.
But as for damage, that has never been proven to my knowledge and form my research.
Roz
3.0 SVT hybrid...all the fixens...Track/Race ready very soon!!!!!! 20,000 + miles
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Joined: Apr 2002
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Originally posted by GSVT:
That why deisel fuel is like 56 octane (something like that) and deisel engines don't have spark plugs. the fuel ignites because of compresion.
Octane is a specification used for gasoline engines. Cetane is the specification used for diesel engines.
Octane is the anti knock index used in gasoline engines. RON is the research octane number, which is calculated. MON is the motor octane index, which is from a lab test using a gasoline engine to test for knocking. Road Octane what you see at the pump is (RON+MON)/2. The RON, the calculated octane, of diesel is essentially zero. The MON of diesel, well I don't know anyone who would knowingly put diesel into a gasoline engine so there is no MON of diesel.
Cetane is the index used for diesel engines. Cetane measures the ease with which diesel can self ignite under specific engine conditions. The cetane index of diesel sold in the US is 40. The cetane index of gasoline would be very high but like diesel and octane, the cetane of gasoline is meaningless since you would destroy a diesel engine running pure gasoline. The higher the cetane the easier to start the engine and the engine runs smoother.
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Joined: Mar 2003
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Originally posted by HoosierContour:
93 octane is like $1.299 here, 87 is $1.199 and 89 is $1.249
for 2 cents more they pump it for you.
I run 93 octane, and I pump it with a blue towel under the pump to stop drips from getting on the paint.
looking at 1.98 here for 94 oct.
95 GL MTX Zetec, Carbon Fiber hood:
*neoprene seat covers
*new SVT rear bumper 
*Proud Owner of 1962 Chevy Corvette 427
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Joined: Jan 2003
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I just filled up with 93 at $1.69 a gallon. Thats after going down from like $1.90
'99 Silver SVT
Quaife LSD
Centerforce DF
B&M Short Shifter
DMD
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