2008 RXT-X Slow top Speed

[JohnCiccarelli]

The top speed is only 62 MPH. Shouldn't it be closer to 70? I had another one of these skis a couple years ago and it topped out at 68.

The Max RPM is 8140. Is there anything except the impeller that could cause this.

Any Ideas, John

 

[mattydipps]

The top speed is only 62 MPH. Shouldn't it be closer to 70? I had another one of these skis a couple years ago and it topped out at 68.

The Max RPM is 8140. Is there anything except the impeller that could cause this.

Any Ideas, John

Usually in warmer waters you'll loose some rpms.. It doesn't seam too bad to me I lost around 100 rpms or so from winter to now..

 

[JohnCiccarelli]

I guess I am going to order a new Impeller and Wear Ring. The chart that I have says that the 2008 RXT-X should use a 14/19 Solas Concord. It says 15/21 for the 2009 RXT-X 260. Everywhere I read people seem to be using 15/21 or 15/22. My ski is stock and I do not plan on any Major Mods. Would I be OK with a 15/21. In the end I hope to get near 70 MPH.

Thanks for any advice, John

 

[KK40384]

I guess I am going to order a new Impeller and Wear Ring. The chart that I have says that the 2008 RXT-X should use a 14/19 Solas Concord. It says 15/21 for the 2009 RXT-X 260. Everywhere I read people seem to be using 15/21 or 15/22. My ski is stock and I do not plan on any Major Mods. Would I be OK with a 15/21. In the end I hope to get near 70 MPH.

Thanks for any advice, John

Here's what I learned about impellers over the past year when I started modding. Don't change the pitch if you don't plan on increasing the engine output. All you will do is have a ski that doesn't have enough power to spin the impeller with more pitch which will result in loss of top speed. You may feel a slight increase in acceleration but that's about it. Only way is go to a 15/21 is if you plan on some basic intake and exhaust mods along with the freebies such as filling in your ride plate holes (makes a huge difference). What I would do if I were in your position is have the stock impeller fixed and the pitched to a 15/20 if you mod or stick with stock pitch for now. That would be more cost effective.

 

[JohnCiccarelli]

Here's what I learned about impellers over the past year when I started modding. Don't change the pitch if you don't plan on increasing the engine output. All you will do is have a ski that doesn't have enough power to spin the impeller with more pitch which will result in loss of top speed. You may feel a slight increase in acceleration but that's about it. Only way is go to a 15/21 is if you plan on some basic intake and exhaust mods along with the freebies such as filling in your ride plate holes (makes a huge difference). What I would do if I were in your position is have the stock impeller fixed and the pitched to a 15/20 if you mod or stick with stock pitch for now. That would be more cost effective.

Wouldn't a Solas be a good option if I can get one for only a little more then the Repitch cost? I am told that it is about $145 to Repitch. I also do not loose the use of my ski while my stock impeller is being repitched.

I have another silly question. Will the inexpensive Solas Impeller Tools that are about $14.00 work to remove the OEM Impeller or do you need the longer ones that cost more like $34.00?

 

[KK40384]

Wouldn't a Solas be a good option if I can get one for only a little more then the Repitch cost? I am told that it is about $145 to Repitch. I also do not loose the use of my ski while my stock impeller is being repitched.

I have another silly question. Will the inexpensive Solas Impeller Tools that are about $14.00 work to remove the OEM Impeller or do you need the longer ones that cost more like $34.00?

Last I checked on Impros site I think I repair and re pitch was less than $100 plus shipping and the new Solas impeller run anywhere from mid 200s to low 300s depending if it is an R model or not. I could be wrong on both of those since it has been a while since I went impeller shopping.

As far as the impeller removal tool goes the short one works fine. I paid something around $14 on eBay for mine. A sturdy bench vise is far more important than the length of the tool.

 

[Coastiejoe]

My 09 hits 72 MPH and is totally stock.

A aftermarket impeller if the same pitch will normally give you an over-all improvement due to the design. The OEM impellers are squared off at the ends of the fins compared to rounded and sharper blades of aftermarket.

 

[JohnCiccarelli]

I bit the bullet and ordered the parts. Worx WR229 Intake Grate, Solas SRX-CD 15/20 Impeller, and Wear Ring.

After all of the feedback The Majority thought that 15/20 was the best pitch without a lot of other Mods. I was able to get a new Solas for not a lot more then getting my Stock Impeller Repaired and Repitched. This allows my to keep my ski together until all of the parts come. I was told that the Solas is an improved design, meaning they hook up better, mosty felt at acceleration, as well as being a little faster at top speed.

I did a lot of reading on the Intake Grates and it was between the R&D and the Worx. I decided on the Worx.

I will report back once I get it all together.

Thanks again for all of the help, John

 

[KK40384]

Looking forward to see the results.

 

[JohnCiccarelli]

It is apart and it isn't pretty. Both the Wear Ring and Impeller are pretty bad. All three fins on the impeller are bent.

The pump is Back together. Next I need to reassemble and get it in the water.

 

[mattydipps]

when you get some results report back im very interested.. ive been thinking about replacing my impeller but since the ski only has 20 hours i cant justify the purchase yet.. maybe ill go suck up some rocks so ill have no choice haha

 

[KK40384]

If it was that bad you'll be pleased with the results. A gouged wear ring and one bent blade took almost 7mph of my top end and a lot of cavitation to boot.

 

[JohnCiccarelli]

If it was that bad you'll be pleased with the results. A gouged wear ring and one bent blade took almost 7mph of my top end and a lot of cavitation to boot.

I'm really surprised I didn't have a lot of Cavitation. It actually was pretty quick out of the hole. I will have it in the water in the morning. I am anxious to see how it does.

 

[JohnCiccarelli]

All I can say is WOW. It is a different ski. I am guessing that the speedometer only goes to 70? If not than 70 is as fast as it will go. Speedometer says 70 at 7640 RPM. I think it reads about 3 MPH High. That makes it 67 MPH at 7640. The Max RPM is 8040. This seems about right to me. Any guess what the top speed may actually be. My GPS is on my Marine Handheld Radio and the display is very small. I don't trust myself to read it at this speed. If I do some simple math and say 67 MPH at 7640 RPM. That would be 70.5 at 8040 RPM. I assume that it is not linear but I think that this is close.

The combination of the 15/20 Solas and the Worx Intake Grate seems to work great for a stock ski. I was a little surprised at the finish on the Worx. I expected it to be a lot more polished. That said it does work great.

Thanks again for all of the Ideas, John

 

[KK40384]

On GPS you should be right around that 70mph mark give or take. And yes speedo only reads to 70

 

[Coastiejoe]

My speedo had me at 72 and GPS at 73 on my 09 RXT-X.

 

[JohnCiccarelli]

My speedo had me at 72 and GPS at 73 on my 09 RXT-X.

I thought that the Speedometer would only go up to 70

 

[Coastiejoe]

I thought that the Speedometer would only go up to 70

I will take a picture if I can hang on well enough ,,,

 

[KK40384]

I thought that the Speedometer would only go up to 70

08 only goes to 70 as far as the 09s go I'm not sure. iBR models are GPS enabled.

 

[JohnCiccarelli]

08 only goes to 70 as far as the 09s go I'm not sure. iBR models are GPS enabled.

I recently replaced the cluster and I was just told by the CanDooPro Folks that the limit is set in the cluster. I don't know why they would limit this.