NASA is changing the rules for ST1 in 2017...going to a 6:1 weight to power ratio and adding a big penalty to "Sports racers, “Prototypes”, monocoque race cars."
https://www.nasaproracing.com/rules
https://nasa-assets.s3.amazonaws.com/document/document/4272/ST_Rules_2017--v11.1--10-31-16.pdf...