i have never ran a nova, so i have no idea.... and every motor has its own quirks lol.

I ran the 121vr in my rc8t with a 16t clutchbell and the stock spur and WOW! that thing was wicked. It still had crazy bottom end, but it felt a little lean in the bottom and rich on top... she came off at 220 after about 25 minutes(had a screw come out of my rear upper link). I have about a gallon on the motor now and it seems to just get better