Search results

  1. Z

    2003 Toyota Corolla Octane Rating

    My 1zz has a 10.0:1 compression ratio. I’ve been running 87 for the longest time but have recently started to smell the car running rich( The exhaust pops really loud with no tune on the car). The car has a cold intake and exhaust. Should I be running 89? Would it make any difference or would it...