Has anyone done a comparison of the .18 VX, SH, and OS engines on the same model. I've read that the OS has more power than the SH which is better than the VX, but has anyone done speed comparisons of the three on the same model?

My Volcano with the VX 18 would run 31 with the stock gearbox and now runs a max of 38.5 with the direct drive setup on 20% nitro. That's with my gps taped to the truck, so it's accurate speeds.