If its vta on carpet track any size size up to 45-90 with a ballistic motor ... Do 5.0fdr with timing right past the sticker. I promiss u this is the fastest a 21.5 will go in a vta car without boost or turbo in the esc
Justin & Matt Lyons
Sponsored by awesomatix, EA motorsports, sanwa, Protoform, Avid, and Gravity Rc!
a800s sanwa m12s, EAM motors/batteries