USB to RS232 FTDI Adapter ecm Also available for the OBD2

Also available for the OBD2 harness here:  VEMS vw68 mk3 OBD2 Standalone ECU

user-friendly tuning software

Once connected to the ECU with VemsTune

Reduces chance of knock

otherwise not until one follows the instructions - some useful data is really required so support can start review and help - often will request more specific measurements

USB to RS232 FTDI Adapter ecm Also available for the OBD2Appr. 0. 85m long cable that provides an RS232 port (standard, appr. + 8V voltage levels, compatible with VEMS ECUs) on computers with USB port (most notebooks nowadays lack builtin RS232 port). The windows driver of this FTDI ("FT232") is better than the infamous prolific (pl2303 that has a windows driver which is often problematic and causes unstable connection), definitely this FTDI type is recommended. For the curious, the cable is powered from