no faster with new motor

[moggy12]

just changed my speed passion v3 10.5 motor for a speed passion mmm 10.5 motor in my rc12r5.1 12th car max motor timing on v3 was 10 degrees on the mmm its 20 degrees which i run last night i run the core rc speedo in blinky mode i thought the mmm would be quicker having the extra 10 degree motor timing but was a lap slower with the mmm has the v3 on the same track layout has the week before i also run the same roll out (gearing) any ideas ?