Yeah. The problem with 2g datalogger is you don't get many points to see what is really going on. Don't get me wrong, it definately is must have tool. When you log with a datalogger for a 2g, the things you want to log is rpm, timing and O2. If you have a wideband, you can hook it up to the EGR wire harness and track along with RPM and timing.
So you can see what your timing is doing with the rpm.