HI Guys 'n' Girls

 

Is it true that jap fuel is 100 octane?

and that the jspecs require higher octane fuel to run properly?

 

if the above is the case, then is it possible to retune for 95 or 97 octane fuel? and what wound i need to change?

 

or is it best just to use Optimax which is supposed to be 98 Octane but still substancially lower than japanese fuel?

 

I have noticed a huge difference in responsivness between normal unleaded fuel and optimax.

 

are there any other side affects of using lower octane fuel?

 

I hope this make sense.

Cheers

Mick

Can't say for sure as I'm not an expert when it comes to Fuel systems, but a couple of guys on here have had problems when using normal unleaded. The previous owner of my car only used normal unleaded for the 6 months he had it. It seem to run ok, but the first time I filled it up I used optimax and the idle was all over the place the car had breathing difficulties. I was just about to take it in to get it sorted, but I thought I'd fit my traction control first.

I disconnected the ECU to fit the TC, when I connected it back up all my problems were gone. So it seems that if you do have problems reboot your ECU (or just disconnect the battery for 30 mins) and this will probably sort most of them if not all of them out.