Our MRX3 with SP ESC and 3.5T motor hit the carpet track this morning for it's first test. everything is fitting nicely with our solution using (2) 5200mh
40C SMC packs to get our 4s 14.4v. we did not see the limit of 4.5T motor with the SP ESC at 14.4v so I think we had a thermal issue and may have killes the speedo, but WOW this is going to be cool.
We have more speedo's and (2) 5.5T showing up tomorrow, and we'll get them in and share our results.