i find with the ECS axles i am slower in fact , and i think this comes from the lack of resistance the ECS gives .
The chatter from the normal axles scrubbs speed off on turn in , so there is no need to brake or let off early for the corners , I tested them back to back in my T3 and i was 0.2sec a lap quicker over an 18 second lap with normal axles because i wasn't over braking at every corner
Just my findings