i just bought a 36 with 500 procharged it starts to porpoise at about 60 mph i only ran it up to 90 still porpising.can some one help.

Get bigger motors, go faster, no more porpuse

At the lower speeds you should be able to get it out with the center tab. At 90 it shouldn't be porpoising still, try a diffrent trim setting.

mine starts porpoising around 70 and stops at 100...
trim it neutral and drive through it...
with 900SC's its about 4 big hops, then bye bye

My dad used to have a spectre.. It started porpusing right at around 70mph.. Like they said above... Power through it and you should have no problems.. Try tucking it in a little and throttle through it.

Good luck and I wish I was in your shoes!

Same for ours. Actually, same size motors too.

About 65-85 on mine like they say power thru or cruise at 60mph.
Enjoy