05 xrs octane rating - Toyota Nation Forum : Toyota Car and Truck Forums

Corollaxrs05 · 02-10-2006, 11:31 AM

Hi i have a 2005 Corolla xrs which has a 11.5:1 compression ratio, right now i am running 91 octane everytime i fill up. I plan to buy the trd japan piston and ring set that will bring the compression ratio up to 13:1 but before i buy them i want to know that my car is going to run ok on 91 octane because there really is nothing higher than that where i live. So my question is will 91 octane be high enough for 13:1 compresson?

CorollaDX-R · 02-12-2006, 04:45 AM

u can go to chevron and fill up 94 and add octane booster cuz i heard in japan they use way higher octane gasoline then we do... but the new IS250/350 is running 12:1(IS250)/11.8:1(IS350) compression ratio

***REN69*** · 02-12-2006, 11:45 AM

that's because they use a different Octane rating.. basically I think they're 100something RON octane = our 91 Octane, so he should be fine with 91 or higher.