New Impellor?

[jxg]

new to the forum and newer pwc's. purchased a used 2008 GTI 155 in October, and just starting to use it again after its winter sleep (this is my first ski since a kawasaki standup in the 80's).

there is nothing wrong with the ski, this is more a question about whether i should make an impellor change or not. The ski pulls fine, and runs fast. my issue is that i live on a river that opens out to the ocean. i have about a 5 mile ride down the river before i get to my open ride, and a lot of it is no wake zones. i am more than happy with the top end (and especially since my daughters are the main riders, they really don't need the top end). the ski does not seem to like the no wake zone. its like we are on and off the gas constantly. can i op for a different impellor that would allow the ski to move a bit quicker at the idle (i know i would lose some low end grunt, but that seems fine right now)?

How easy is it to remove the current impellor (and do i even need to remove it to see what I currently have)?

thanks...

 

[Chrisazo1]

Why not just turn up your idle speed?

 

[jxg]

i guess my explanation kind of sucked. its not really the idle speed. i guess i could do that, but it seems like it sort of works hard (higher RPMS than I expected) to maintain a 5 mph speed. it just seems to not like to idle. or i give it gas, back off, give it gas, back off.

and if i do turn up the idle speed, it would then be too fast for when i really want to be at the "around the dock" speed, i think. maybe i am asking too much out of one setup.

 

[Dennis]

The idle speed is computer controlled and cannot be adjusted. :cheers:

 

[jxg]

damn those computers (i am a programmer, hehe).

just out of curiosity, are there programmers out there for the skis, like i have for my Huqvarna fi dirtbike? not that i want to buy anything for this right now, just wondering.

 

[Chrisazo1]

Our Yamaha FX 1.8 Cruisers have a dual wake mode button. Does anyone make a kit to do this with the Seadoo? If not you could make a small fortune...

 

[red2blue]

... the ski does not seem to like the no wake zone. its like we are on and off the gas constantly. can i op for a different impellor that would allow the ski to move a bit quicker at the idle (i know i would lose some low end grunt, but that seems fine right now)?

How easy is it to remove the current impellor (and do i even need to remove it to see what I currently have)?

thanks...

swapping the prop ain't hard with the proper tools...no pun intended.

You may have it backwards though re low end grunt and top speed. Increasing low end grunt sacrifices top speed. Your ski isn't the most powerfull..not sure how many choices you're gonna have. Usually...and that is what I mean....asking for low end power...ie..not having to spin the motor all the way up to make power...sacrfices top speed.

With your limited choices..maybe a 3blade will work as opposed to a 4 blade prop that you already have. The 3 blades are used and liked for low end grunt.

All that aside...if you can't find another prop but want a lil more outa what you got...tweak it yourself. Add a coupla mm to the trailing edge. You won't have the power to take advantage up high but you should see a bit more at idle. I know that I idle faster than any of the stock rxt's I hang with....idle rpm being equal...only a taller prop to explain the difference.

 

[Ski Son]

I am also new to the forum and have recently (last month) bought an 07 GTI SE 130 and 08 GTI 130. I am also new to performance aftermarket parts for these guys and am wondering if I will be able to put some hop-ups on. Nothing major like boring the engine..ported cylinders..or other fancy crap. Just looking for some easy, relatively cheap, bolt on acc I can put on myself. Being that these parts do not grow on trees, I probably will have to play favorites and chose just one ski to bulk up for now. Once I have everything on it will be interesting to do a comparison between the two (since they are neck and neck at full throttle stock (53ish mph)).

Number one is an impeller like jxg above, but my use will be more for speed and torque. On a stock motor I understand there are limitations to the pitch you can get so you don't overload the motor. The Solas Concord 10/18 (SR-CD-10/18) seems to be the best choice...please let me know your opinions though.

Also, looking at an intake grate as another improvement. I am unfortunately even more unfamiliar with these and don't know if there are limitations for stock motors or not. On top of that...I'm lost in a battle field of brand warfare. Riva?? R&D?? Worx?! Any advice is greatly appreciated.

Any other bolt ons will be considered so if you have suggestions (exhaust...etc), don't hesitate! I realize that there isn't a huge market for aftermarket performance parts for the GTI's but there is some. I just don't want to overload the capacity of my new skis and have a blown motor before I get through the first summer with them Thanks for the help! Forum is great so far!

 

[red2blue]

Ski son...sorry to bust your bubble.

If you want more than what your ski can give...buy a stronger ski.

Sorry...not much out there...if anything to up the performance of a 130.

 

[jxg]

red2blue. thanks for the advice. i guess i didn't explain myself correctly as far as the understanding of pitch, etc on the impellor. problem for me is I am trying to compare it to my malibu ski boat with the planing hull, so i can pretty much set that at whatever speed i want, and it hold it dead on for hours on end. i really don't care about losing the top end (don't really want the girls going to fast anyway), just want the ski to work a little less at the slower speeds.

thanks again.

 

[red2blue]

Like has been said...idle speed should be around 1800-1850rpm. That's it. So you want the ski to work...easier?.....go for a smaller prop. Engine will work less...because you'll be under a smaller load...but you will go slower. I don't know of a cruise control that works at speeds as low as fast idle...which is what it sounded like you wanted to begin with.

But...you wanted more speed at idle. My suggestion of a taller prop, stands. Weather you can find one aftermarket or tweek your oem prop. You'll get better idle speed..better low end grunt(if it ain't too tall)...but you won't have the ponies to use it to it's full potential and therefore will see slower top speeds. win win...right?

One last thing...even a taller prop...we ain't talking 5mph improvments here at idle speeds...heh...not even close. were talkin .5 to maybe 1mph.

 

[jxg]

thanks, taller may be all i need. have to do some experimenting next week..

 

[chucked]

Why cant you just give it a little gas?

 

[jxg]

because doing that causes the ski to be jumping from trying to plane to not planing back and forth. it seems to struggle to try to hold that speed to not cause a wake, but not be to slow. just trying to eliminate the need for that. not a big issue, was just hoping there was an easy solution.

 

[chucked]

Well if you do anything to make it idle faster its still going to try to plane.