Guys I need help!

[magman]

I just finished my Mugen MRX-3 BL conversion and I am having a serious issue. On the bench it winds up quite nicely, but, once on the ground it barely moves. The motor direction is right, the end points on the radio is maxed out, I trippled checked the esc settings...I am at a loss. I did move the spektrum rx to this car from another car but all I did was change model info on radio so that should not matter.

The car rolls freely on the ground with out power being applied. Any ideas would be helpful

Set up:

2 5K Zippy 25C 3S packs in series for 6S
1518 1800kv It is all I had to test with...a 2600kv will go in later
Spektrum 3S

MMM esc settings:
low start power
70% punch
70% brake
10% drag brake
0 timing
3.3v cutoff
Reverse lock out