Flatwater mag pump advantages?

[Idok]

Yes, my engine is puny enough to warrant a 140mm.
I know I'm going against the almighty bandwagon with this "race pump", but I happen to trust the guy that built my setup - more than free Internet forum advice.

:biggrin:

140mm 12 Vane setback.

Impeller will be around 13/18

i ran a 140setback mag for about 1.5 seasons on a heavily ported 760....ran it with a WW short cone and a 15/20 swirl and it worked great!

in fact, it had too much hookup for me at the time....so I sold it


getting ready to try a 144 mag after daytona.....

 

[OCD Solutions]

I've been looking into this for the last few weeks too, trying to decide between setback and standard and have spoken to a number of experts about this. When I spoke to Glen at Skat-trak he asked if I was racing. He said that if i wasn't racing then he doubted I would feel any difference between the two. However if I was racing and all skis on the water were identical except for setback and standard, the setback ski would be out front everytime. Dave at Impros agreed.

Now don't get me wrong, they didn't say that the setback wasn't still better, they just said the improvement from standard to setback wasn't near as great as the improvement from stock pump to standard mag and may not justify the added cost of an extended driveshaft in a freeride or freestyle setup for the average rider.

If money is no object, the choice is clear, Setback all the way. But if you are on a budget then going with the standard mag is still not going to be a mistake. if you can't afford that, then the stock pump with a TBM and mag impeller is the next best thing.

stock pump = 5/10
Stock w/TBM = 7/10
standard mag = 9/10
setback mag = 10/10

Simple as that.

 

[Matt_E]

There are only two reasons I went with a setback pump:
1. It was available used at a fair price
2. I needed a new shaft anyway

 

[x2skier]

What's the deciding factors for number of veins, diamaters, etc.....other than $$?

 

[kevbo]

What's the deciding factors for number of veins, diamaters, etc.....other than $$?

Anything that is spinning fast and moving fast likes 140 pumps. Strokers doing freestyle need bigger pumps.

 

[masterblaster]

I found on my ported 760 superjet
48novis , type 9 pipe , digital ignition that a 140 mag was to much for it
yes i did alot of propp testing it just dragged the ski to the water to much and the boat felt heavy
they chaged the rules in that class and i went back to a big hub with a tbm pump cone lost a bit of hook up but the boat was quicker by a long way

Now with the 8mm stroker the tbm pump gone doesnt get a look in , it will cavitate no matter what i do
The mag pump is the only thing that will hold it

I think that might actually help in freeriding the ocean,Alot of us like the ride a little lower and tighter in the whitewater,might be a little harder to slide across the wave and hit the lip hard,but would rock for re intres

 

[Foximus]

On my "550" I could not hook up using a old 14/19 at all.. This is with a 650sx pump and my Tim Judge 701, I'm also using a "Worx 201" copy I made, Same dimensions. The pump is "setback" over an inch from the stock 550 location, and the steering nozzle sticks almost 5" out the back. It would slide around, cavitate, and no do anything impressive in general. I put on a TBM and a Hooker 9/17 and it is just night and day. Throttle responce is the same, but actual pump response is just instant. There is no delay in pump pressure. Stab on the throttle and the ass sinks in and hugs to the turn. Let off the throttle and the ski will instantly go into a flat slide. On the opposite, since I love creek riding, I ride in a "drift" style. I turn before the apex, let the ski go slideways, then stab on the throttle at the apex and it grabs and shoots forward. With the narrow and square bottom 550, its to jarring for most. For me its ideal. I could not Imagine spending all the money on a 12 vane and then gain an extra 15 lbs or so in the rear.... I hopefully will be going to a 750sx pump soon to become even more "setback", an additional 7mm. Really for the money I dont think you could do anything better. My one regret is I feel like It may have made the ski love top end pump pressures to much.

And yes I realize the above is all about a 140mm 750/sxr pump style, and I agree on a 144 pump, a TBM will most likely overload most motors.

 

[Matt_E]

:love:

I approve of this pump and don't know how I ever got along without one.
Gains everywhere, no disadvantages. Boat's a completely different ride now.


Maybe someday I'll even buy the right-sized pump. :lmao:

 

[jetpilot08]

Hey... I thought you didn't even own a ski! :lmao:

Good to hear you back on the water. My parts should show up on Tuesday hopefully. Unfortunately I'm tied up with work and school work this week but I'm going to try to get everything going by sometime next week.

 

[Matt_E]

The Superjet pump does not have the problems that Kawasaki has. A stock 144 pump with an 85mm nozzle, deep Worx grate, and an impeller pitched just right is hard to beat until the water get really rough.

I'll get back to you on that when I got the mag in.

Now that I've tried it - the stock Superjet pump has been beat hard, into a bloody slimy pulp on the side walk.

 

[Waternut]

Now that I've tried it - the stock Superjet pump has been beat hard, into a bloody slimy pulp on the side walk.

That good huh? Did you ever run a TBM pump cone on any of your boats before going to a mag?

 

[Matt_E]

No.
I have ridden a boat similar to mine with similar engine, equipped with the TBM cone.
While the setup details of that one are out of my hands, performance was not even close.

 

[Scorn800]

:love:

I approve of this pump and don't know how I ever got along without one.
Gains everywhere, no disadvantages. Boat's a completely different ride now.


Maybe someday I'll even buy the right-sized pump. :lmao:

Glad to hear you like it:Banane09:
Nothing hooks up like a mag:bananapowerslide: