300/440/550 550 in a 440 hull, have three impellers, which one would be best ?

[monoshock]

I put a 550 in a 440 hull and took it out today for a test run, it has a Jetlyne 830345 on it now. I have a lot of top end now, but coming out of the hole it feels slower than my 550 pump with a stock impeller that the motor came out of.

I have a new Jetlyne 830342 and a Scat Trac #7

Should I change to one of the other impellers or stay with the one that's on there now?

Little more info. I'm 190lbs. The motor is a 86 550 and the hull is a 90 440 with rear exhaust.

 

[DaUpJetSkier]

I think the skat 15 or 15.5 is the ideal combo, I have a 15 in my 440/550 ski and it rips top end but could use more bottom imo, it has all the bolt ons and keeps up with my mild 650 sj, its skinnier so its faster but theres no replacement for displacement.

 

[monoshock]

Jetlyne 830345
Jetlyne 830342
Have any idea what pitch these are?

A assume the Skat Trak #7 is a 17 pitch.

 

[john zigler]

the scat would be a 17 pitch.

the others i can look up later, when i get to the shop.

i have jetlyne aftermarket 440 pump nozzles here, that are larger ID than the stock one. that would give you some bottom end too.

 

[oxnard111]

I also have a ocean pro pump nozzle. It measures 72.5mm.