[QUOTE=ala42;2159523]IIRC also previous Pioneer drives did not allow to burn 8x +R disks faster than 12x. The firmware restricts the write speed somehow.[/QUOTE]I’ve used my DVR-11[B]2[/B]D with either firmware 1.24 or 8.25, in this same scenario [I was using Sony-branded YUDEN000 T02, and wanted to try 16x and 18x], and got up to 18x offered for the T02 after strategy swapping for T03. [The drive actually attempted to do 18x and 16x, did 12x and 8x at using P-CAV instead of Z-CLV, etc].
Maybe it’s just the DVR-115D firmware with the problem here.