fuel question, regular fuel against hi-octane fuel Options

[junkmate]

well... ive been driving my SS-III (which i assume has the 3S-GE engine) for over a year and a half now, and only recently did i realise that the petrol cap says "ONLY HI-OCTANE FUEL"... and ive been using regular the entire time...

is that like... really bad?
is it worth changing to hi-oc from now on?

(ps. when i first got the car my japanese wasnt so good, so it took me a while to actually be able to read that warning so im only half a retard...)

[WannabeGT4]

Americans with the 5SFE and 7AFE can use 87 octane (R+M/2) which is about the same as 92 octane (RON) in Japan... which I'm pretty sure is your cheap stuff. I believe that the 3SGE is a higher compression engine so I wouldn't be suprised if you had to run mid-grade or higher fuel.

If you run a lower octane in a high compression engine your ecu will pull timing until the knock sensor stops sending a signal to the ecu. This will obviously result in a loss of power. You may be ok with the lower octane fuel but I'd suggest finding out exactly what your car requires and what is available in your area. If you can't find out just run the highest grade fuel available... better safe than sorry.

This post has been edited by WannabeGT4: Oct 3, 2005 - 11:58 AM