Flatwater mag pump advantages?

[x2skier]

If you got the extra $$$, setback is the only way to go. I'm running a standard mag now, I can't wait for my new XS 148 setback mag.

It's money well spent, IMO

Yeah, but why is it the way to go?

 

[Aircraftsalz]

Yeah, but why is it the way to go?

Setback pumps allow more volume (water) to be loaded/stored in the pump area, vs a Standard pump. Many of the Aftermarket hulls now are setting the pump back.

Thats how it was explained to me & it makes sense if you think about it.

If you got lots of Brap under the hood, a Setback mag is the only way to put the power to the water. My new build will have a XS1000 & Billet Mag 148 Xscream/Scat pump.

 

[Waternut]

I know I've read about people using the TBM cones and getting worse results. Is this just because the prop is pitched too high or because the engine lacks the power?

 

[nokfir]

according to ericmalone.com, the eme hull with a pipe stock 800 sxr motor with a mag pump will backflip....without the mag pump it will not.
[video=youtube;HRCE4C2GrNk]http://www.youtube.com/watch?v=bS_zC8sURA4"]YouTube- Eric Malone - Stock power back flip on EME Q8[/url][url="http://www.youtube.com/watch?v=HRCE4C2GrNk&feature=player_embedded[/video]

 

[rollin5150]

I think I am going to go the way of the TBM pump cone for price reasons. I have seen the ones CP watercraft does when they install the pump cone and port you stock pump looks great and I think would be a huge improvment over stock.

That is what I did with my SXR. Installed the TBM pump cone and felt a huge difference in hookup.

 

[Watty]

I found that when you hop the ski and nail/free rev in the air, the mag pump grabs the water and hooks up a lot faster. It allows you to really get the revs up and have almost instant punch when the pump hits the water, and you don't get that cavitation that you do with a stocker.

On the turning side of things, I liken the normal non setback mag to cutback prop in a stock pump, only twice as noticeable (can lean ski over a lot more, and requires less water to get the same results as oem pump)

There is though a trade off between a mag pump and a stock hull. You could have the best mag pump in the world, but if you can't get any stability in your hull, it's wasted.

 

[kevbo]

I know I've read about people using the TBM cones and getting worse results. Is this just because the prop is pitched too high or because the engine lacks the power?

Dont confuse Kawasaki and Yamaha setups. One of our local riders spent a lot of money on a new Hooker 10-16 and TBM for his superjet. The results were horrible, too much load. This setup was recommended by the "pros", That taught me that everyone is just selling a bill of goods. I did a lot better with a used Concorde and a hammer. I wonder if Malone buys his own pumps?

 

[jetski9010]

Dont confuse Kawasaki and Yamaha setups. One of our local riders spent a lot of money on a new Hooker 10-16 and TBM for his superjet. The results were horrible, too much load. This setup was recommended by the "pros", That taught me that everyone is just selling a bill of goods. I did a lot better with a used Concorde and a hammer. I wonder if Malone buys his own pumps?

Somthing had to wrong with this setup. What was he running for a motor and was there any problems with the motor setup?

 

[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.

 

[kevbo]

Somthing had to wrong with this setup. What was he running for a motor and was there any problems with the motor setup?

The problem was the load, it was too much for that otherwise strong 760. I was just illustrating how the tuning is far more important than the hype surrounding a part. And that the pros don't always know what will work for you.

 

[jetski9010]

the two pros I have talked to have been all for a mag pump or tbm cone but they did say you need the HP to use it. The were talking to me about 5mm stroker's and up. I dont think that a 760 would fall into the group of high HP motors but maybe thats just me.

 

[2XLR8]

On that Malone video with the stock 800 engine with a wet pipe and stock 40 mm mikunis. I think it would have worked a little better if the choke plates were fully open. Maybe its an optical illusion, but they sure looked closed a bit.

 

[Matt_E]

They look half-closed.

 

[2XLR8]

A 140 mm pump should work best for any modded engine less than 900 cc. Most will disagree and say anything over 800 cc and larger is better with the 144 and 148.
A 12 vain 140 mm pump sounds like it is too small and it makes sense to think that way once you picture all the vains all stacked up against each other and see how much area they are taking up and basically blocking water flow, yet they work so good. I had a 6 vain non setback and later did 12 vain set back and the biggest difference I saw was top speed. I felt the 6 vain still worked leap years ahead of the stock pump. The insert cones can't compare with a mag pump. If someone found similar performance it has to be due to the impellers used. Even if it was the same impeller or it matched the top speed rpm between the comparisons, they react different in different pumps.
Matt, It sounds like you have a decent running engine. I would not hesitate and I would just get the Mag Pump. What I found on my old superstock was that the pump allowed better power transfer. Where the boat was starting to come on to the power and really accelerate the Mag Pump would allow the boat not to become unhooked like the stock pump did. I could concentrate more on riding than on shifting my weight trying to keep it hooked up. At very high speeds the Mag Pump made the boat so much easier to keep in control and it kept the boat tracking straight specially in big chop.

 

[Polish jet pilot]

Some tips heard from some knowleadgable persons for ported 701- 760 platfroms:

TBM: if you insert it, you must seal it. Water gets underneath (between tbm tube and pump) and disrupts flow. If you can't afford the TBM - you can make a "similar" setup from e.g. epoxy...

Prop: Stock + 08 SJ prop is a hooker really. You can cut it 3mm. Fill in the void with something and balance it (BUN's way to go). Good to see if the blades are nice and equal..

Pump: polish the pump...., you can increase the volume by boring the venturi inside. Also boring the outlet on the venturi is mandatory.

Can anybody confirm?

 

[Matt_E]

I am more interested in the advantage of the real deal, not unconfirmed DIY epoxy jobs. :biggrin:

 

[Scorn800]

My friend & I did back to back testing on limited SXR's. I had a 6vein mag pump with a 14/19 prop and 81nozzle. He had a stock blue printed pump with TBM cone and same prop/nozzle. His boat always slid out in 1 corner while my boat stayed hooked up. We swapped boats and I tried his and slid in same corner while he rode my boat and did not slide. Mag pumps are made to hook up.

 

[Polish jet pilot]

Buy a pump from Maxxx he is a good guy and his products are cheap
maybe yo ucan get just the "vane case" section from him??

 

[Matt_E]

Buy a pump from Maxxx he is a good guy and his products are cheap
maybe yo ucan get just the "vane case" section from him??

I'd rather support an innovator company and not an imitator.
Besides, I would be spending $1k or more. I am not comfortable sending that overseas without any established feedback.
If I have issues with Skat, I know whom to contact.

 

[jetski9010]

i'd rather support an innovator company and not an imitator.
Besides, i would be spending $1k or more. I am not comfortable sending that overseas without any established feedback.
If i have issues with skat, i know whom to contact.

x2