High octane at the track???
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Launching!
Joined: Apr 2007
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From: Chandler,AZ
High octane at the track??? I did some searching and got a little insight into my question.
From what I understand,I can run un-leaded 100 or so,if I want and not hurt a thing?
I ask cause I honestly dont know the adverse effects,if any it could have on my car.
As long as its un-leaded its useable?
I was curious as to how the computer would react?
Is it even worth splashing a little for some runs?
~Will~
From what I understand,I can run un-leaded 100 or so,if I want and not hurt a thing?
I ask cause I honestly dont know the adverse effects,if any it could have on my car.
As long as its un-leaded its useable?
I was curious as to how the computer would react?
Is it even worth splashing a little for some runs?
~Will~
it is reall a waste of money, if your car is tunes it is optimized at 93 octane. Anything over that will just burn off.
Now if you would be spraying or using forced induction and thats a different story.
Now if you would be spraying or using forced induction and thats a different story.
Thread Starter
Launching!
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From: Chandler,AZ
Originally Posted by black01_WS6
it is reall a waste of money, if your car is tunes it is optimized at 93 octane. Anything over that will just burn off.
Now if you would be spraying or using forced induction and thats a different story.
Now if you would be spraying or using forced induction and thats a different story.
GotchaMostly stock vehicles,just dont have the tuning needed to benefit.
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Thread Starter
Launching!
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From: Chandler,AZ
Originally Posted by RacerScott
You would not gain a single thing.
You would gain more by running the LEAST octane possible without the knock sensors pulling timming back.
You would gain more by running the LEAST octane possible without the knock sensors pulling timming back.
My car has:
lid/catback/msd wires/ram air, as far as little bolt-ons go.
Care to elaborate just a little on the lower octane?
Are you saying the car would advance timing(I think ...)to compensate for the low grade fuel?Thus gaining,however much.
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Originally Posted by six_string_wiz
Care to elaborate just a little on the lower octane?
Are you saying the car would advance timing(I think ...)to compensate for the low grade fuel?Thus gaining,however much.
Are you saying the car would advance timing(I think ...)to compensate for the low grade fuel?Thus gaining,however much.
Launching!
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From: Exton, Pennsylvania
Originally Posted by Formula413
Lower octane fuel can produce slightly more power than higher octane.
I have heard someone suggest this before, only to be immediately made aware that it was incorrect by someone who seems to know what they were talking about when it came to gasoline.
Thread Starter
Launching!
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From: Chandler,AZ
From what im getting,an engine running a high octane fuel, that is not tuned to burn the fuel at the proper rate will detonate and knock.Resulting in a power loss,as it applies to a 91 octane tuned engine???
Am I getting the right idea on this???
Am I getting the right idea on this???
Originally Posted by RussStang
Exactly where did you come across this information? It is certainly contrary to what I have come to understand.
I have heard someone suggest this before, only to be immediately made aware that it was incorrect by someone who seems to know what they were talking about when it came to gasoline.
I have heard someone suggest this before, only to be immediately made aware that it was incorrect by someone who seems to know what they were talking about when it came to gasoline.
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Launching!
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From: Chandler,AZ
Originally Posted by Formula413
As I understand it, the additives used in gasoline to raise the octane number are not as volatile as the gasoline itself and therefore do not produce as much power. So higher octane fuel, having more additives, produces slightly less power. Of course, when you are talking about fuel being used in a high compression engine like the LT1 or LS1 it's more complicated. The higher octane fuel allows for much higher compression and greater timing advance due to it's increased resistance to detonation. This more than makes up for the slightly lower power available from the higher octane fuel. If you do a search in the advanced tech forum there is a thread about octane boosters which has some good info. I don't claim to be an all knowing expert on this subject by any means, if anyone with more knowledge of this than me sees any innacuracies in what I just wrote by all means chime in.
Teching In
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The octane number gives the percentage of iso-octane by volume in a mixture of iso-octane and normal heptane that would have the same anti-knocking capacity as the fuel that we are comparing it to. Put more simply, since gas is not simply a mixture of iso-octane and n-heptane, but rather a conglomerate of various hydrocarbons, the octane number is an non-literal reference to the fuel's anti-knocking capacity in terms of the ratio of iso-octane to heptane. When we break down the composition of race fuels vs. your every day pump gas, we usually see more xylene, toluene, ethane, methane, benzene, and iso-octane, among others, due to their resistance to autoignition under the dynamic temperature/pressure conditions typically found in the combustion chamber thanks to the high activation energy required to initiate combustion of these compounds.
With regards to the power contained per unit volume of fuel, premium racing gasolines can both have a higher octane and a greater energy content. The power that an engine produces depends on the energy content of its fuel, which unfortunately bears no correlation to its octane rating. I'm just rambling on now, but what I'm trying to say is that gasoline is such a complex mixture that any combination of octane rating and energy content is possible, it just depends on the precise mixture of the fuel in question. In a nutshell, an engine will not benefit from a higher octane alone, but it is possible that a premium higher octane race fuel might have more energy content per unit volume. Conversely, the hydrocarbons added to increase octane rating might also have a lower energy of combustion resulting in a fuel with high octane rating and low energy content. Without a precise analysis of the exact fuel you are going to use, there is no way to know.
With regards to the power contained per unit volume of fuel, premium racing gasolines can both have a higher octane and a greater energy content. The power that an engine produces depends on the energy content of its fuel, which unfortunately bears no correlation to its octane rating. I'm just rambling on now, but what I'm trying to say is that gasoline is such a complex mixture that any combination of octane rating and energy content is possible, it just depends on the precise mixture of the fuel in question. In a nutshell, an engine will not benefit from a higher octane alone, but it is possible that a premium higher octane race fuel might have more energy content per unit volume. Conversely, the hydrocarbons added to increase octane rating might also have a lower energy of combustion resulting in a fuel with high octane rating and low energy content. Without a precise analysis of the exact fuel you are going to use, there is no way to know.
Last edited by Zealot; Jul 5, 2007 at 04:56 PM.
Thread Starter
Launching!
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From: Chandler,AZ
Believe it or not I understand what youre saying.
TUNING.Its all in the tuning,spark and compression.
Without adjusting for Higher grade fuels,a mostly stock engine will not have the tuning required,to make proper use of the energy content held within a specific grade?
Correct?
TUNING.Its all in the tuning,spark and compression.
Without adjusting for Higher grade fuels,a mostly stock engine will not have the tuning required,to make proper use of the energy content held within a specific grade?
Correct?
Last edited by six_string_wiz; Jul 5, 2007 at 06:33 PM.
Originally Posted by 1meantransam
i figure if you run some 110 at track maybe you can clean some of the engine out with that high occcccctttttane stuff... would that work?