For example, if you have a DMG:44 Relic+1 weapon or a DMG:39 weapon, both would be set to DMG:33 if you level synch to 49.
The scaling is percentage based. If you show up to a lower level dungeon to help out a friend you *immediately* notice the difference compared to when you last ran something if you're using a higher level weapon much less a relic/+1. After having run AV a few times in the past two weeks to help out the slower leveling people in the free company it sure as hell doesn't set you to D33 or whatever the 'ilvl' of the dungeon equivalent weapons drop.
I think the way it works is it syncs you to level X, and all of your gear to ilevel X.
AKA you are level 50 with ilevel 90 weapon and i70 gear
You go to 49, and all of you gear caps at the stat caps for i49 gear. Which is why Kojiro says a relic or a relic +1 will both cap at the same dmg.
Traditionally stat caps are determined by:
2) rarity (normal< hq crafted=pink <green=blue)
But on level sync it all goes to ilevel normal i believe, so any bonus from rarity is lost.
Except that isn't how it works either. If it did, you'd never have a higher level tank friend in say Toto-Rak with nearly 1,500 health that's endgame geared. Or a CNJ doing nearly 40-50 more points of healing than someone that's of the 'proper' gear.
The scaling's percentage based. It looks that more than likely they went with a Blizzard style algorithm in that it sets the stats based on the level of the sync and nothing with ilevel is taken into consideration (or if it is, it's extremely loose and generous in comparison to FFXI's **** scaling). Edited, Nov 6th 2013 3:50pm by Viertel