tunes for 95/98 octane?
Thread Starter
Cobra Member
Joined: April 7, 2005
Posts: 1,452
Likes: 0
From: Holland
Does anyone know whether there are any available tunes for 95 or 98 octane fuel from Diablo, Xcalibrator, etc?
The problem I have here in Holland is that we only have 95, 98 and 100 octane fuel, and I wanted to get a tune but I haven't seen anywhere a pre-set for any of these fuels.
I have recently read in a discussion on this forum that there may be a difference in the way the octane number is being expressed between the US and Europe. Someone was saying that apparently what we call here "95 octane" is equivalent to what 93 octane is in the US.
This however sounds a bit hard to believe for me (I am a chemical engineer) because I know the octane number is the equivalent of the volumetric percentage of izooctane (2,2,4-trimethylpentane) in a mixture of izooctane and N-heptane. This means that a 95 octane fuel detonates identically to a mixture containing 95 vol% izooctane and 5 vol% N-heptane. It's obvious that the metric and/or imperial systems have nothing to do with the calculation. Therefore, I find it hard to believe that there could be a difference between the US and European standards.
Any help/info? Thanks!
The problem I have here in Holland is that we only have 95, 98 and 100 octane fuel, and I wanted to get a tune but I haven't seen anywhere a pre-set for any of these fuels.
I have recently read in a discussion on this forum that there may be a difference in the way the octane number is being expressed between the US and Europe. Someone was saying that apparently what we call here "95 octane" is equivalent to what 93 octane is in the US.
This however sounds a bit hard to believe for me (I am a chemical engineer) because I know the octane number is the equivalent of the volumetric percentage of izooctane (2,2,4-trimethylpentane) in a mixture of izooctane and N-heptane. This means that a 95 octane fuel detonates identically to a mixture containing 95 vol% izooctane and 5 vol% N-heptane. It's obvious that the metric and/or imperial systems have nothing to do with the calculation. Therefore, I find it hard to believe that there could be a difference between the US and European standards.
Any help/info? Thanks!
Mach 1 Member
Joined: August 16, 2004
Posts: 653
Likes: 0
The Diablosport Predator comes with a 93 octane performance tune. You may be able to get a custome tune made for a higher octane. Try the parts forum, Brenspeed.com offer the Xcal with 3 custom tunes to your specs.
GT Member
Joined: October 9, 2004
Posts: 114
Likes: 0
It was me with the Euro Octane info, my other Mustang is a Novi blown 1990 with around 550 hp, you tend to get fixated about these things running such a car!
Octane rating
There is another type of Octane, called "Motor Octane Number" (MON), which is a better measure of how the fuel behaves when under load. Its definition is also based on the mixture of isooctane and n-heptane that has the same performance. Depending on the composition of the fuel, the MON of a modern petrol will be about 10 points lower than the RON. Normally fuel specifications require both a minimum RON and a minimum MON.
In most countries (including all of Europe and Australia) the 'headline' octane that would be shown on the pump is the RON: but in the United States and some other countries the headline number is in fact the average of the RON and the MON, sometimes called the "Road Octane Number" or RON. Because of the 10 point difference noted above this means that the octane in the United States will be about 5 points lower than the same fuel elsewhere: 87 octane fuel in the United States would be 92 in Europe.
From:
http://www.wikimirror.com/Gasoline
So no problem really! Just run 98 & tune for 93.
Octane rating
There is another type of Octane, called "Motor Octane Number" (MON), which is a better measure of how the fuel behaves when under load. Its definition is also based on the mixture of isooctane and n-heptane that has the same performance. Depending on the composition of the fuel, the MON of a modern petrol will be about 10 points lower than the RON. Normally fuel specifications require both a minimum RON and a minimum MON.
In most countries (including all of Europe and Australia) the 'headline' octane that would be shown on the pump is the RON: but in the United States and some other countries the headline number is in fact the average of the RON and the MON, sometimes called the "Road Octane Number" or RON. Because of the 10 point difference noted above this means that the octane in the United States will be about 5 points lower than the same fuel elsewhere: 87 octane fuel in the United States would be 92 in Europe.
From:
http://www.wikimirror.com/Gasoline
So no problem really! Just run 98 & tune for 93.
Thread Starter
Cobra Member
Joined: April 7, 2005
Posts: 1,452
Likes: 0
From: Holland
Originally posted by ukfiveo@May 9, 2005, 8:40 PM
It was me with the Euro Octane info, my other Mustang is a Novi blown 1990 with around 550 hp, you tend to get fixated about these things running such a car!
Octane rating
There is another type of Octane, called "Motor Octane Number" (MON), which is a better measure of how the fuel behaves when under load. Its definition is also based on the mixture of isooctane and n-heptane that has the same performance. Depending on the composition of the fuel, the MON of a modern petrol will be about 10 points lower than the RON. Normally fuel specifications require both a minimum RON and a minimum MON.
In most countries (including all of Europe and Australia) the 'headline' octane that would be shown on the pump is the RON: but in the United States and some other countries the headline number is in fact the average of the RON and the MON, sometimes called the "Road Octane Number" or RON. Because of the 10 point difference noted above this means that the octane in the United States will be about 5 points lower than the same fuel elsewhere: 87 octane fuel in the United States would be 92 in Europe.
From:
http://www.wikimirror.com/Gasoline
So no problem really! Just run 98 & tune for 93.
It was me with the Euro Octane info, my other Mustang is a Novi blown 1990 with around 550 hp, you tend to get fixated about these things running such a car!
Octane rating
There is another type of Octane, called "Motor Octane Number" (MON), which is a better measure of how the fuel behaves when under load. Its definition is also based on the mixture of isooctane and n-heptane that has the same performance. Depending on the composition of the fuel, the MON of a modern petrol will be about 10 points lower than the RON. Normally fuel specifications require both a minimum RON and a minimum MON.
In most countries (including all of Europe and Australia) the 'headline' octane that would be shown on the pump is the RON: but in the United States and some other countries the headline number is in fact the average of the RON and the MON, sometimes called the "Road Octane Number" or RON. Because of the 10 point difference noted above this means that the octane in the United States will be about 5 points lower than the same fuel elsewhere: 87 octane fuel in the United States would be 92 in Europe.
From:
http://www.wikimirror.com/Gasoline
So no problem really! Just run 98 & tune for 93.
Indeed, it was you who said that. I also asked a guy at work who deals with car engines and he gave me the exact same explanation about the RON and the MON. I guess I knew something about the octane number, but nothing about this difference.
Thanks a lot!
Cobra Member
Joined: March 14, 2004
Posts: 1,268
Likes: 0
Since the car is designed to run on 87 octane in the US and you gain nothing by using a higher octane, you should be fine running 95 in Holland. Unless you mod your car all you will get by using 98 octane there is higher of of pocket expenses for gas.
Thread
Thread Starter
Forum
Replies
Last Post