By Josh, N54 Accesstuner Tuning Tips
To make changes to the WGDC (Base) table , you need to log 'Boost Setpoint Factor' and 'MAF Req (WGDC)' since these are the x and y axis. This is the main WG table and the car is normally running here.
MAF Req is not the same monitor as MAF Req (WGDC)
The main thing to remember with these cars is that you use the WG table to control boost and throttle closures, not to make boost. Once you have your commanded load, you just want there to be enough WG to support the boost request that comes from the load request.
The WGDC (Spool) table is only used in the lower RPMs and will never go above the Spool Mode Max RPM. It can also kick out of spool mode before that time if Load Act starts to approach Load Req quickly. When logging Fuel Mode, 20 means you're in spool mode and using this table, 2 means you'll be using the WGDC (Base) table.
If you want to carry boost out a bit more in the top end, you can raise the values of Load Target and Load Target (AT) so they don't taper so drastically in higher rpm's. This should also help with the throttle closure up top since it will be requesting more load.
You can log a lot of monitors at the same time on the BMW's, so here's what I would use:
Lambda (Bank 1)
Lambda (Bank 2)
Timing Cor. Cyl 1
Timing Cor. Cyl 2
Timing Cor. Cyl 3
Timing Cor. Cyl 4
Timing Cor. Cyl 5
Timing Cor. Cyl 6
Timing Cyl 1
Req. Boost Abs
Boost Mean Abs
Boost Setpoint Factor
WGDC After PID
Those monitors are my usual base for tuning and will show anything you need for correcting throttle closures, dialing in boost, and recognizing knock. If I'm ever making a map for an E85 blend, I add STFT, and LTFT. If the trims aren't were they should be, I log the LPFP and HPFP Req vs Act to make sure that the pumps are able to keep up with the extra fuel volume.