Originally Posted by camry_RHD
Jason btw I have been running 94 octane (98 RON only since I bought it).
If you're running a higher octane, then you want a HOTTER plug, not colder (or you can just run the proper octane - 87). You always want to be right at the point before detonation.
High octane fuel in the 5SFE is a waste of money. The engine can't take advantage of it (low compression, limited ignition timing).
1991 Toyota MR2 V6
Ported, rebuilt MY2000 3.0L 1MZ
Fully OBDII compliant and California smog legal