I need some help on why I seem to lose mph when racing, just recently I have dropped from 117mph doin 11.4s to 113/114mph doin 11.6s in a vz SS 6litre my 60 fts are 1.634, my reaction is around .040 running street ets on 15psi, I just seem to be going down in mph my engine sounds normal and not getting much wheel spin and launches well but I'm at loss on why my mph is dropping when I'm pretty much racing with the same setup, the only mods is a cam and stall with 3.9 gears any help would be appreciated, I'm thinking of doin a compression test but the motor was built early 2015 thanks.