FX-1 What impeller pitch is the best?

[Jobu]

I have a stock FX-1 (I will probably put a pipe on it very soon) and I want to upgrade from my stock impeller. I'm going with a skat trak swirl prop but I am unsure of what pitch is best. I looks like my options are 18/23, 19/24, or 20/25. I want bottom end performance............don't really care about top end.

 

[kevbo]

I have a stock FX-1 (I will probably put a pipe on it very soon) and I want to upgrade from my stock impeller. I'm going with a skat trak swirl prop but I am unsure of what pitch is best. I looks like my options are 18/23, 19/24, or 20/25. I want bottom end performance............don't really care about top end.

You will need to go with the lowest pitch and modify the engine for high RPM in order to get better thrust from a tiny pump. A larger pump is the only way to get decent low speed thrust.

 

[Dirtybird]

I am wondering the same thing.
All i have for it at the moment is a b pipe and aftermarket waterbox.
Already refoamed and reinforced just dont want to tear into a fresh fix to install the pump mod.
Need best brap for the buck at the moment.

 

[1fastsedan]

I had an 18-24 with a pump cone. Once I added the pipe and head I was bouncing off the rev limiter. Put the msd on and and my ski ripped. Had a tad cavitation in the surf but I loved that little pump. Now I'm sitting on a 144 that I'm trying to find the right pitch for.

 

[550headache]

i put a 18/23 swirl in my stock pump fx1 and it was a huge improvement over the solas that was in there before. money well spent imo.