Originally posted by Ross
i was not sure so i called the honda dealer and they said regulare is fine and the computer would adjust to it but you might hear a slight knock but it will go away and it is noting to worey about i also called and independent shop and aked and he said it is fine they only recomend premium for the increase in prefprmance
If you hear any knock I'd throw a bottle of octane boost in it. Siphoning a gas tank is a PITA. Trust me. I siphoned the gas out of my GSR swap. :squint:
Chipped Civic ECUs can't control a knock sensor, which means they will merrily knock their way all around town without adjusting for the lower octane.