Super Jet Mag Pumps for Freestyle - Sizing...

[Parsonsjb88]

Ok, so someone with good knowledge of mag pumps and past experiences pleas chime in here. I've done hours of searching on xh2o and google reading dozens of threads on mag pumps but it doesn't seem like any of them answer my questions or they all contradict one another.

So here it is: We are talking freestyle only; what mag pump is best for what motor? I know that's a vague question but what I'm trying to understand is why some people are saying never go over a 144mag on a limited 701, meanwhile I'm reading of others that are putting 148's or even 155 mag's mated to the same engine... Then I hear of people going as high as 160 mag pumps on many different sized motors, and controversially i hear of people suggesting a 140 mag on a limited 701. So WTH?

My current setup is a 735cc, ported 61x, 62t cases, dual 44 carbs (tau ceti style filters), MSD enhancer, b-Pipe, tnt waterbox, lightweight flywheel and couplers, high comp head, and vforce2 reeds. I eventually want to go to a 900cc+ but that will not be for at least a year or so, however in the meantime I want to get a mag pump to give me better hookup, preferrably not having to buy another pump when i upgrade the motor. Thoughts?

 

[speedysprocket]

I think at this point in time it all comes down to your budget. If you can afford a 155 mag, you can tune it to your 701 and then have a pump that will grow with future upgrades.
I actually make a 148 pump that runs close to the price of a Solas 144...

 

[VXSXH20]

148. It will allow for changes and whenever you build progresses further. By the time you get a larger motor you may be thinking different hulls or setback what have you. For the cost the 148 is hard to beat if that is your price point and budget. 144 mags are very nice and can support 900cc. If that is where you are headed then spend the money on something slightly bigger and go for it. 148 pump also accept most aftermarket trim systems and oem hardware as well, From pump seals to reduction and exit nozzles. Just my .02

 

[Proformance1]

All depends on budget, current hull tunnel, shoe, motor, future plans, and trim parts, advise for tuning etc. you can run a 160 with a 701 but...

 

[DAG]

+1 for @speedysprocket's pump expectantly for the setup you have and want to grow into. Its hard to beat the performance and price.

 

[700Pirate]

I have a edge with a 155 mag and a predator with a 148, both with a 1000cc Dasas and the 155 just has so much hookup compared to the 148 in choppy surf. Now maybe there is more to it like hull design, grates, impeller etc but the 155 hooks and boosts you very F fast.

Looking forward to next build as its easy with a 144 setback and a sub 800cc non pv motor. Fun set up


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[Proformance1]

A lot has to do with weight of everything, center of gravity, body position, etc, etc. Take a 144 tunneled 40 lb hull and slap it in the surf. Very low hookup. Now a 125 lb hull with a superior designed tunnel. Its all the pieces working together that make the ultimate package. We took a perfectly running KDX with an 1100 and a 148 Torrent and put everything as one into a stock SJ hull. Huge disappointment, still a blast to ride, but nothing compared to the light hull with superior tunnel. Its all about the tuning of your particular package, suited to what you want to accomplish specifically. That is key.

 

[kevbo]

Steeper impellers boil water at low speeds which hurts thrust. If it takes more than 16-17 degrees of pitch to load the engine, a larger diameter pump should be used. The advantage diminishes as the ski gets moving so there is little if any top end improvement. The entire inlet needs to be enlarged as well in order to realize the full effect of this mod.

 

[Parsonsjb88]

Awesome info, thanks guys!

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