Running a 74 18' challanger with built 455 and was pretty dissapointed after my first run this weekend. The motor runs great and strong at all rpms but boat dosnt really get moving till im almost 3/4 throttle and higher. Dosnt seem to be slipping but more like the thing is in first gear when it should be in 2nd or 3rd(i know they dont have gearbox just for comparison lol). I only was hitting 60ish on gps at almost wide open throttle on a 400hp motor. Im new to jet boats and finding out jaccuzzis arent the most fav pumps but was woundering if an impeller change, any kind of machine work, or if and energizer kit would be my best bet. I also want to add a place diverter but would like to wait to see if any kind of bowl swap might hlep me out first. I have tech know how and access to full machine shop. Thanks again for the input everyone, Josh

Ok im planing on a place diverter for sure and may up my cam and do a roller set up in the motor this winter. Not sure exact numbers for rpm guessing around 5500ish maybe 6k I will have new tach hooked up this weekend and know for sure. Hope the pd gets me some more mph!

Yeah im going to be pulling the pump soon for inspection, what are some thoughts on upgraded loader grates/scoops for the bottom? Would they help out at all with mid range/Top end speed at all?

I spoke with tom the other day I belive, the whole jets coming off this winter to paint the hull so may just send him the unit to inspect/repair. The rest of the boat was pretty trashed befor I got my hands on it so wouldnt be suprised if jet could use some work.