Overkill - pump cones

Manbearpig · 01-06-2010, 07:53 AM

After all the hype I decided to add a quality billet freestyle cone to my SXR. Prior to this my ski had awesum bottom end and predictable handling. My mods are

Wetpipe with timing jumper
Bored nozzle 81mm
ADA head 28cc domes
D cut rideplate

Since installing the freestyle cone I immediately noticed my handling characteristics had changed dramatically. When conducting an agressive low-mid speed turn my ski used to slide a bit (due to the rideplate) and then hook up immediately when I jumped back on the throttle hard.

Since installing the freestyle cone when doing the same turn the ski just does one major powerslide and takes forever to hook back up and when it does its unpredictable. It was sorta fun at first but just frustrating now. I haven't gained any bottom end whatsoever from this mod either. If anything it feels like it has lost a bit of bottom and top end and cavitates in the chop worse than before.

It seems to me you can upset the handling/thrust balance of the SXR if you have the above combo of mods and add a freestyle cone. I have only ridden my ski once since fitting the cone and will give it another chance but so far I don't rate it with my current setup. Has anyone had the same effects? And what are your mods.

MBP

JonnyX2 · 01-06-2010, 09:46 AM

MBP which cone are you using? I have had excellent results with the sleeve type cones (TBM, R&D afterburner, etc)

cujo · 01-06-2010, 10:11 AM

Manbearpig, I had good results with a WW freestyle cone with the same set up as yours, minus the wetpipe.

I thought it was the best $50 I spent on the ski.....

Oh well, its easy to put the stock one back on........

john zigler · 01-06-2010, 11:41 AM

we also ahve installed many WW freestyle cones, and i too think it is the best 50.00 you can spend. ( on ythe right application, and machine). of course, each set up is different.

what i HAVE found though, is they DO NOT always work with a large pump nozzle. you may now need a more aggressive pitched prop, to keep your pump pressures up. or try switching to a stock exit nozzle. if your prop is stock, you may want to go to a cut back, scat swirl. we have been running -6mm props on the SXR's.

i think their typically intended to use "in place" of a bored nozzle.

anthrobe · 01-06-2010, 12:09 PM

I have a very similar setup as you. Wetpipe, head, and timing jumper. I used to run the freestyle pump cone but like you, I had the same results. I ditched the stock prop and installed a Solas 13/22 cutback 5mm. Then I installed a TBM pumpcone. This combo works excellent. The ski pulls much harder from bottom to top. I gained a few MPH on the top end, and the bottom hits even harder. The best bet is this thing hooks up so much more. Still not as good as a mag pump, but well worth the money IMO.

SxiPro · 01-06-2010, 01:01 PM

Quote:

Originally Posted by john zigler

we also ahve installed many WW freestyle cones, and i too think it is the best 50.00 you can spend. ( on ythe right application, and machine). of course, each set up is different.

what i HAVE found though, is they DO NOT always work with a large pump nozzle. you may now need a more aggressive pitched prop, to keep your pump pressures up. or try switching to a stock exit nozzle. if your prop is stock, you may want to go to a cut back, scat swirl. we have been running -6mm props on the SXR's.

i think their typically intended to use "in place" of a bored nozzle.

Bingo. For a lot of applications you want to use one OR the other. I'm not saying that using both won't improve some setups, but more often than not you only want to choose one of the mods.

anthrobe · 01-06-2010, 02:02 PM

I find that interesting for all you hear is people stating that you should bore the nozzle and install a freestyle cone. It all does make sense with above statements.

Manbearpig · 01-07-2010, 12:32 AM

I should have mentioned that I also have a TBM intake grate - so I would hate to think what the hookup would be like with the stock grate.

The cone I installed was a JRE stubby freestyle cone. Really well made product. I haven't tried a sleeve type yet ie afterburner, TBM, blowsion.

I'm thinking the sleeve type cones are probably the way to go for me as it allows fine tuning with different length cones. Agreed with your responses I may need a more agressive prop to keep the pressure up. So a Solas 13/22 -6 or -5 is in order.

Anthrobe - did you try the 13/22 prop with the stubby cone instead of the TBM sleeve cone and what were the results?
Cheers,

MBP

g-fly · 01-07-2010, 11:37 AM

Manbearpig, it certainly sounds as if your pump is a lot less efficient with the freestyle cone. Freestyle cones by design allow less pressure in the pump to the nozzle which in turn allows the engine to rev and reach peak RPMs quicker allowing the leading edge of the impeller to gather more volume. Volume, pressure and the quickness of it exiting the nozzle are what determine the availability of hookup and it’s the lack of these are what is causing you to spin out longer than you are used to. You can either go back to your original cone or if you want to increase your hookup, you will need to increase the pitch of the leading edge on your impeller.

Hope this helps,

G

anthrobe · 01-07-2010, 12:49 PM

Quote:

Originally Posted by Manbearpig

I should have mentioned that I also have a TBM intake grate - so I would hate to think what the hookup would be like with the stock grate.

The cone I installed was a JRE stubby freestyle cone. Really well made product. I haven't tried a sleeve type yet ie afterburner, TBM, blowsion.

I'm thinking the sleeve type cones are probably the way to go for me as it allows fine tuning with different length cones. Agreed with your responses I may need a more agressive prop to keep the pressure up. So a Solas 13/22 -6 or -5 is in order.

Anthrobe - did you try the 13/22 prop with the stubby cone instead of the TBM sleeve cone and what were the results?
Cheers,

MBP

The original plan was to install the prop, test, then install the TBM cone. Of course I had the pump out and got excited so both went in at once. I am also running the TBM intake and that is a world of difference over stock. I have ran a D-cut ride plate in the past and that is all fine for jumping and freestyle. If you want to keep you boat planted in turns and stuff, I would put back on the stock plate or go to a TBM or Macc.