Oh sorry my bad, but the search button didnt help me either..
Heres my log
I 19:06:56 ImgBurn Version 2.5.2.0 started!
I 19:06:56 Microsoft Windows 7 Home Premium x64 Edition (6.1, Build 7600)
I 19:06:56 Total Physical Memory: 4'051'480 KB - Available: 2'884'288 KB
I 19:06:57 Initialising SPTI...
I 19:06:57 Searching for SCSI / ATAPI devices...
I 19:06:57 -> Drive 1 - Info: TSSTcorp DVD+-RW TS-L633C DW50 (E:) (SATA)
I 19:06:57 Found 1 DVD±RW/RAM!
I 19:11:19 Operation Started!
I 19:11:19 Source File: C:\Users\ROLF\Desktop\[WII]Dragon Ball Z Budokai Tenkaichi 3[CUSTOM][PAL][ESPALWII.com]\dragoncustom_espalwii.iso
I 19:11:19 Source File Sectors: 2'294'912 (MODE1/2048)
I 19:11:20 Source File Size: 4'699'979'776 bytes
I 19:11:20 Source File Volume Identifier: Dragon Ball Z Budokai Tenkaichi 3
I 19:11:20 Source File File System(s): Special
I 19:11:20 Destination Device: [1:0:0] TSSTcorp DVD+-RW TS-L633C DW50 (E:) (SATA)
I 19:11:20 Destination Media Type: DVD-R (Disc ID: MBI 01RG40) (Speeds: 3x; 4x; 6x; 8x)
I 19:11:20 Destination Media Sectors: 2'297'888
I 19:11:20 Write Mode: DVD
I 19:11:20 Write Type: DAO
I 19:11:20 Write Speed: 2.4x
I 19:11:20 Link Size: Auto
I 19:11:20 Lock Volume: Yes
I 19:11:20 Test Mode: No
I 19:11:20 OPC: No
I 19:11:20 BURN-Proof: Enabled
W 19:11:22 Write Speed Miscompare! - Wanted: 3'324 KB/s (2.4x), Got: 4'155 KB/s (3x)
I 19:11:23 Filling Buffer... (40 MB)
I 19:11:23 Writing LeadIn...
I 19:12:09 Writing Session 1 of 1... (1 Track, LBA: 0 - 2294911)
I 19:12:09 Writing Track 1 of 1... (MODE1/2048, LBA: 0 - 2294911)
I 19:29:30 Synchronising Cache...
I 19:29:52 Exporting Graph Data...
I 19:29:52 Graph Data File: C:\Users\ROLF\AppData\Roaming\ImgBurn\Graph Data Files\TSSTcorp_DVD+-RW_TS-L633C_DW50_SONNTAG-21-NOVEMBER-2010_19-11_MBI_01RG40_2.4x.ibg
I 19:29:53 Export Successfully Completed!
I 19:29:53 Operation Successfully Completed! - Duration: 00:18:32
I 19:29:53 Average Write Rate: 4'409 KB/s (3.2x) - Maximum Write Rate: 4'741 KB/s (3.4x)
I 19:29:53 Cycling Tray before Verify...
W 19:48:29 Waiting for device to become ready...
I also forgot to say, that the write speed does always change to 3x..