Well did a test pass today on only 10S again with new gearing. 79.7mph and 80.3mph!!!!!! No video yet....so its not offical passes until this weekend if the weather cooperates. Doesn't look good though for the weather.... Those passes were not clean passes either, the truck was skating bad from side to side. Need to work on the suspension a little. I think it should go 81-83mph on a clean pass, then the 12S lipo goes on and cross your finger for 85-90 maybe somewhere in between. Also that is still on the small 1521 motor. My 1527 has not been installed yet.