i run the Neu 1512 1.5D on 4s in my losi 8 buggy and it is super fast and very efficient. great all around motor. in fact, i am selling my Neu 1512 1.5D right now. i am no longer running the buggies and moving strictly to truggies. i was going to list the motor on ebay. i have only ran about 8-9 sessions of 10-30 minutes. i can get 40minutes of run time but dont always run that long. i only used it for racing a few times. i also have 2 Losi 4s 5000mah 25c batts. one was used 1 time. the other was used like 8 times. motor is basically new. bought it last month. PM me if you have any interest or want to see pics. i am flexible on price. here is the link for more info on the motor along with some reviews from owners.
http://www.impaktrc.com/product_info...oducts_id=2380
http://www.impaktrc.com/product_revi...oducts_id=2380
http://www.impaktrc.com/product_info...oducts_id=3271
http://www.impaktrc.com/product_revi...reviews_id=180