Does it have SD card logging or can it be achieved easily?
My experience with experimental airplane engine monitoring led me to totally divorce "SD card logging" from main monitoring. You recover lots of SRAM and avoid the timing issues with the SD.
http://www.hackster.io/rayburne/sd-card-serial-logger
Also, Excel can parse within the data, making it simpler on uC:
http://www.hackster.io/rayburne/arduino-to-excel-using-v-usb
Ray
Added: forum member Fat16lib has some new code in the Storage sub-forum for high speed analog logging which may be useful to you in the future.