CMS-GT4
Active member
So we know the JDM ecu's are tuned for 98RON. What does that really mean. It has been expressed often that Japanese fuel is a higher octane than our fuel. I have read that you can get 101+ RON in Japan. While at a store going out of business I picked up some clearance octane booster. So clearance price plus GOB discount got me 104 boost for about $3 a bottle. I have used toluene in the past,but its quite expensive considering how much you need to use.
Based on this forum I found that 93 octane is likely pretty close to the Japanese RON figures. While some states are limited to 91 octane, you can use a booster method to get it closer to 93.
http://forums.audiworld.com/showthread.php?t=2594262
USA (AKI/PON) --- Europe (RON)
87 = 91
89 = 93
91 = 95
93 = 98
Another link with calculated conversions. This one looks a bit more thought out than the audi post and ranks 94 close to the 98RON and 93 just below.
http://www.pencilgeek.org/2009/05/octan ... sions.html
Some real reviews of octane boosting methods.
http://www.fueltechexperts.com/2008/08/ ... h-is-best/
Calculating fuel ratings here.
http://www.csgnetwork.com/octaneratecalc.html
Here is a fuel finder as well if your wanting to locate the highest octane near you.
http://www.racegas.com/fuelfinder
I had feared that running 93 octane was far too low for my engine, when it is closer than what I expected. Also I can gain maybe a RON with the octane booster I bought and feel a little more secure. Especially on race day.
You may consider running different brands of gasoline. I learned recently from some local refineries that there are different qualities of fuel and engines will respond to that. I had been running BP myself, and they told me that BP is actually on the low end. Phillips 66 is one that is on the higher end. It may be worth experimenting with.
If anyone has any data to share on the subject or links please comment. Also, tune at your own risk.
Based on this forum I found that 93 octane is likely pretty close to the Japanese RON figures. While some states are limited to 91 octane, you can use a booster method to get it closer to 93.
http://forums.audiworld.com/showthread.php?t=2594262
USA (AKI/PON) --- Europe (RON)
87 = 91
89 = 93
91 = 95
93 = 98
Another link with calculated conversions. This one looks a bit more thought out than the audi post and ranks 94 close to the 98RON and 93 just below.
http://www.pencilgeek.org/2009/05/octan ... sions.html
Some real reviews of octane boosting methods.
http://www.fueltechexperts.com/2008/08/ ... h-is-best/
Calculating fuel ratings here.
http://www.csgnetwork.com/octaneratecalc.html
Here is a fuel finder as well if your wanting to locate the highest octane near you.
http://www.racegas.com/fuelfinder
I had feared that running 93 octane was far too low for my engine, when it is closer than what I expected. Also I can gain maybe a RON with the octane booster I bought and feel a little more secure. Especially on race day.
You may consider running different brands of gasoline. I learned recently from some local refineries that there are different qualities of fuel and engines will respond to that. I had been running BP myself, and they told me that BP is actually on the low end. Phillips 66 is one that is on the higher end. It may be worth experimenting with.
If anyone has any data to share on the subject or links please comment. Also, tune at your own risk.