Dude. You need to list what you have. What ecu are you running, and what are you using to datalog? Like, for instance. I am running a pm6 with a serial datlogging port, from xenocron. I don't use ecucontrol anymore, because a datalogger that works well is now built into TurboEdit. Turboedit version 2603 can be downloaded from the opensource Turboedit forum on PGMFI.org... just look for the thread with about 16 pages. The link to the download is on page one. The VSS is not completely accurate on some cars, i.e. my DA, but it works for some others, probably because the sensors are different.