My TDM (technical data manual) confirms 41-47 without vacuum at 4500rpms. It also states 47-57 with vacuum. It also states 32 - 39 at 3000 rpm, 26 - 32 at 1500 rpm all without vacuum and 12 - 19 at 800 rpm with a note that 190 with dist VJU 4 BR14 15 - 23 DEG. Login to read more.