Originally Posted by Edjay
Your computer will only retard timing so much before it quits trying. If its going to knock and beyond the capability of the knock sensor, dme. Then it will pre detonate, knock. Pre detonation does enigine damage, it can pit pistons, break ring lands, wear bearings pre maturely. Sure SES light should soon follow. But we dont know how bad this guys knock is. Thats why i say take it to the shop...
Absolutely agree on knock doing damage, but I'm actually asking how lugging does damage. My opinion is that a normal M3 is mildly lugging at 1500 rpm, but don't see how that can cause damage.