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Old 08-27-2008, 05:24 PM   #26
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Quote:
Originally Posted by Tomash View Post
Oh hey, has this question in my head for a while and this topic seems perfect for it.

The thing is, in Europe there're two types of gasoline and both pretty hi-octane, that is 95 and 98.
New cars for european market (since about 1995 or earlier) have engine systems able to distinguish between the two (or somehow detect octane number of fuel) and thus burn 98 more efficiently, giving the engine a bit more kick (dynamics, that is).

My question is, could Camaro also do it (behave better on 98)? Or is it made specifically for american market dominated by 87-93 octane gasoline and thus won't distinguish a 95 from 98, having same performance and feeling on both?
well, the thing is with gasoline in places other than the US, it is rated differently. In Europe 98-octane gasoline is common and in Japan even 100-octane is readily available at the pumps, but this octane nomenclature is misleading to Americans as foreign octane ratings are derived entirely differently from our own... So, like every other measurement system it seems that everyone else uses a different scale than we do, but unlike most other instances where we have had the good sense to create different units of measure in this case we all use the same name...
Japan and Europe use a system called RON or Research Octane Number to determine the octane rating of their gasoline, while stateside we use a system called AKI or Anti-Knock Index to determine gasoline's octane rating... Interestingly, to further complicate things it would seem that our own AKI system is actually derived from the average of the RON system and another more complicated system referred to as MON or Motor Octane Number... So, to recap our methodologies for measuring gasoline's octane rating are different, but share some common elements...
So, with the commonality of RON in mind a good rule of thumb is as follows, multiply the foreign RON Octane rating by 0.95 and you will have the US AKI equivalent.

( RON Octane Rating x 0.95 = AKI Octane Rating )
98 RON Octane x 0.95 = 93.1 AKI Octane (US measure)
100 RON Octane x 0.95 = 95 AKI Octane (US measure)

So, as you can see the 93 or 94 octane fuel we are all paying an arm and a leg for is actually quite comparable to the higher octane fuels found in Europe and Japan. The people whom have to worry about low octane rating are our friends out west in places like California that are subjected to substandard 91 octane.
91 AKI Octane (US measure) = 95.5 RON Octane


http://en.wikipedia.org/wiki/Octane_rating





Quote:
Originally Posted by Vash View Post
Aye it should have it already built in to the ecm. When I was young and dumb in the 80's and had my 78 I would put super or Howell Racing Fuel 104 thinking it was better. All it was doing was fouling my plugs.
did you have a vacuum advance on the dist? or did you add timing to it when you would run the higher octane fuel?
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Old 08-29-2008, 04:43 AM   #27
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Thanks for the explanation, CamaroSpike!
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Old 08-29-2008, 06:29 AM   #28
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Quote:
Originally Posted by CamaroSpike23 View Post
well, the thing is with gasoline in places other than the US, it is rated differently. In Europe 98-octane gasoline is common and in Japan even 100-octane is readily available at the pumps, but this octane nomenclature is misleading to Americans as foreign octane ratings are derived entirely differently from our own... So, like every other measurement system it seems that everyone else uses a different scale than we do, but unlike most other instances where we have had the good sense to create different units of measure in this case we all use the same name...
Japan and Europe use a system called RON or Research Octane Number to determine the octane rating of their gasoline, while stateside we use a system called AKI or Anti-Knock Index to determine gasoline's octane rating... Interestingly, to further complicate things it would seem that our own AKI system is actually derived from the average of the RON system and another more complicated system referred to as MON or Motor Octane Number... So, to recap our methodologies for measuring gasoline's octane rating are different, but share some common elements...
So, with the commonality of RON in mind a good rule of thumb is as follows, multiply the foreign RON Octane rating by 0.95 and you will have the US AKI equivalent.

( RON Octane Rating x 0.95 = AKI Octane Rating )
98 RON Octane x 0.95 = 93.1 AKI Octane (US measure)
100 RON Octane x 0.95 = 95 AKI Octane (US measure)

So, as you can see the 93 or 94 octane fuel we are all paying an arm and a leg for is actually quite comparable to the higher octane fuels found in Europe and Japan. The people whom have to worry about low octane rating are our friends out west in places like California that are subjected to substandard 91 octane.
91 AKI Octane (US measure) = 95.5 RON Octane


http://en.wikipedia.org/wiki/Octane_rating






did you have a vacuum advance on the dist? or did you add timing to it when you would run the higher octane fuel?
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