Sprayed

iTrader: (1)

Hey guys,

I did some searching but couldn't find anything solid. I was wondering if anyone knows what the Octane or RON requirement is for JDM/99 spec cars is. My car doesn't have a sticker on the back side of the gas tank lid

Any help is appreciated!

Narfle

iTrader: (16)

98 RON. Roughly equivalent to US spec 93. Basically, the highest rated normal pump fuel you could locate.

Sprayed

iTrader: (1)

Great to hear. 94 is readily available in my area. I was concerned it might be 100 RON and I would need to purchase an aftermarket ecu and tune it ASAP

jza80

iTrader: (32)

Is the 94 E15 by any chance? That would not work well if that is the case.

Sprayed

iTrader: (1)

It's ethanol free thankfully. Some other gas stations have 91 ethanol free as well

jza80

iTrader: (32)

Perfect!

Ethanol-free is a dream here in California...don’t even ask about 94 octane. :-/

Sprayed

iTrader: (1)

I guess I should be thankful for the gas in British Columbia... except for the fact that our premium gas works out to be over $6 a gallon 😂

L-Spec

91 Octane in my FD for the past 12 years with no problems.

jza80

iTrader: (32)

This is with the JDM ECU?

L-Spec

Stock JDM ECU for the first 1.5 years, until there was a coolant seal failure that forced me to rebuild the engine. I went to a Power FC after that and raised boost pressure to about 13-14psi while still using 91 octane.