How is your Race Capture physically connected to the CAN bus?
I don't have experience with it specifically, but I've messed around with an AiM datalogger to sniff CAN data. My understanding is that the D-CAN bus (the one that's exposed on the OBDII plug) doesn't have all the custom BMW-specific PIDs (or at least it requires some special handshake I haven't figured out to get to them). You can get them if you connect directly to the PT-CAN -- in the cabin, it's easy to tap near the KOMBI or the FEM. I have the exact pins
here.