Last night I finally put a transponder in the B1M, and compared it to me running my B44.3 in the same outing. The B1M runs a Reedy 8.5T, the 44.3 a Reedy 7.5 turn. Track is damp indoor clay, high traction. Also, the B44 is on slicks, the B1M on Barcodes. Same battery packs.
In the end, the B1M was less than a second slower than the 44.3, maybe on average .7-.8 sec slower. I was pretty happy with this result, all things considered. I honestly feel the B1M turns better, it just can't punch out of the corners like the 4WD car, and is a little slower on the straights.
A buddy of mine, who happens to be one of the fastest guys at our track, drove it and said it turns better than his modified B6D, so I was happy to hear that. He also commented on how predictable and stable the car is. He thought it needs some big bores though (running original gold body shocks right now), or at minimum heavier shock oil.
The car has more in it for sure. I think it could easily handle a 7.5T motor. Thing with the 4 gear box MM layout is that it does not try to wheeley, so I think it could take advantage of a bit more motor. There's still more to be wrung out of it with simple tuning too. I think the geometry and weight distribution are fairly spot on, just needs some fine tuning on the spring rates and pistons and/or oil.
As far as the kit is concerned, I should be releasing it in a couple weeks.