Quote Originally Posted by 1.8t
Post up some specs. The last gen of the 4g63 with the Mivec head wasn't the dinosaur of the previous years.
Direct injection, oil squirters, and infinitely adjustable camshaft phasing via the pcm. But mostly, direct injection and the oil squirters. Completely safe (and even conservative) at 12.5:1 AFR undead heavy boost, and combustion temps are relatively low compared to a port injection motor due to the DI and the extra cooling from the oil squirters. More boost, no knock.