Sluggish Brushless

[DaveG28]

Hi All,

Have been running bruyshless for a few months now and very impressed, however put a new LRP speedo in my 501x today and it was very sluggish all day, slightly down on top speed but absolutely no acceleration. CHanged to my old speedo for the final and it was only slightly better (in my other car the old speedo flew!)

Does anyone know if this is most likely caused by esc, or motor, or batterys??

My cells are IB4200, a year old now, my motor is LRP 5.5 (done about 7 or 8 meetings), any help much appreciated!!