P iss water and Jap tuned ECU???

[Negreac]

My clip came w/ a veilside tuned ECU. I compenstaed for everything so far that it may be tuned for except for the gas. I assume the ECU was tuned for max power from high grade japanese pump gas, whatever octane that may be. All I know that is probably better gas than I can get from the pump here. So what I need to know is how much I should retard the timing so I can use 93 octane and not blow my engine up. Any info or suggestions are appreciated. Thanks.

[Yoshi]

unless you're really thrashing on your engine, it's not that big a deal. run the engine, if it's knocking/pinging while idling, retard until it's ok :)

[DJ Machine]

supposedly the max octane in japan is 93, just like the USA..

[kendot240]

according to inidial D max octane in Japan is 106. Not the most reliable source, but I'm alomost positive it's 100 or above

[hookedup240]

just run some octane booster, this may help.

[Nerfdude]

octane booster adds like, a tenth of an octane... don't waste your money.
down the street here in STL, there's an Amoco that sells 110 octane...

[FRpilot]

but who can afford running race gas for daily driving everyday? isn't it like $5+ a gallon and prices are still going up up and up..

[DJ Machine]

japan uses a different rating system for that gasoline iirc.


100 is the equivalent of 93

[240meowth]

if i recall japan have a higher octang rating. from what i udnersatnd the rb25 motor uses around 103octang gas

[driftstyre]

The octane rating in Japan is completely different from the US rating. Gas in the US at 93/94 octane is equal to or better than anything rated at ~100 in the UK, Japan and Europe.