I think Japan uses RON ratings, what are the rating numbers you have available? From what I understand 96 RON in Japan, should be about 91-92 here in the U.S. which uses a (RON + MON)/2 rating.
All fuels here as supposed to have high MON ratings, which could mean while the number in RON is less, it might actually be a better fuel for reducing knock.
Research Octane Number [RON] is a low speed, "everyday" type test. Motor Octane Number [MON] is a higher speed, more stressful test. So, RON tests yield higher numbers and MON tests yield lower numbers. Do a search on RON and MON on the internet to find out about the actual tests.
Originally posted by [email protected] 17 2005, 12:48 AM
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
I bolded what I deem to be the key part of the quote. I actually found this thread through google, as I was trying to find what octane the previous owner was likely using over in Japan. (RHD :tear: )
The Grandfather law (allowing 15+ year old cars to be imported) is going to make RHD more common. So someone else may find this useful.
Issue solved for me: I'm going to use Chevron 94 octane (vancouver island ftl) Rest of the gas stations only carry 91 octane, which i'd prefer not to test quality-wise right now
I've also done previous research internally in these forums, and it seems a fair amount of Western-canadians are preferring Chevron as their top choice(s). Shell aswell may have been frequently listed but I've always preferred Chevron in my vehicles.
Depending on what my engine is verbally telling me, I might get her re-tuned for canadian juice.
I think I have a f*cked motor. It sounds like spun bearing or rod knock
The motor was a used JDM motor swapped in not long ago
Finally got everything together to tune on AEM V2
Car with ZERO boost wastegate disconnected on STOCK twins
I repeat NO BOOST
After a few WOT runs it...
I noticed that the car is holding my driving back, It’s missing that raw driver feedback I need to be able to go faster in corners. I’ve got polyurethane bushings for everything, some new White line sway bars, and MCA red coil overs (it has Old teins right now) coming in but I’m not sure if...
Hi all. I have searched thrue all threads including lexus about this and haven't found an answer.
Car: 02 Lexus is300 2jzgte aristo
Single turbo 6262.
I recently got a apexi neo and also
Bigger injectors to help with the fueling.
Has an in tank walbro 255
When I installed 650cc sidefeed...