there are tons of setups for the car on carpet all over the place. Obviously, they are a little hard to find now that the BD-5 is out... but lucky for you, i've read through all 596 pages of this thread and have collected all the data from the past 4 years lol
look up a dude (germany) named Martin Hofer. Here's his blog. Yokomo driver. He posts in the BD-5 thread as well. He's got tons of info for the bd/bdm. who knows if he's willing to share (he used to be ALL OVER this thread with VERY useful info)
Martin Hofer Blog
there's a tiny link on the bottom that says 'older posts'. that will keep directing you back a few pages to check out his BDM hybrid car.
if you need more info, just PM me.