Top Speed RPM Question

[Huskerjetboat]

I have a 2013 SX240 HO and am operating at 2162 elevation. My top RPM is 7,000 and top speed is 46MPH. Is this what this boat should do? I was hoping to be able to hit 50 from what I have read. this is on smooth water with the driver and one passenger and a half a tank of gas. any feedback will be appreciated.

 

[OrangeTJ]

What's your altitude?

 

[Scarabski]

How is going to get that boat out of the water?

 

[Julian]

Sounds a fraction low, but would be better if another member at your elevation chimed in.

 

[christopherglenn]

I can see how elevation affects power, and rpm. I cannot see how elevation effects rpm VS speed. The impeller turning at 7k rpm pumps X amount of water, through the nozzle, generating Y thrust. Same weight same thrust same speed - no?

 

[Julian]

What are other 240 owners getting as their top RPM?

 

[OrangeTJ]

Correct re rpm vs speed. That said, perhaps 46 is the speed that relates to 7k rpm on your boat.

 

[Huskerjetboat]

Elevation is 2162. Middle Nebraska.

 

[Huskerjetboat]

What are other 240 owners getting as their top RPM?

That's what I am wanting to know.

 

[tdonoughue]

Not the same year, but if recollection serves correctly, I get closer to 8k...

Hopefully I will be able to get out today and check.

 

[McMark]

7k for me is about 45-46mph. 2015 ar240.

 

[Huskerjetboat]

7k for me is about 45-46mph. 2015 ar240.

But is that your top end?

 

[McMark]

No. My top end is 7600ish and 51ish. I thought we were comparing at 7k.

 

[tdonoughue]

Agree. Out here now and tops at 7600 or so.

 

[Huskerjetboat]

Called my dealer and they are going to do some research. I feel I definately should be getting more than 7,000 rpm.

 

[McMark]

Were there CARB boats in 2013?

 

[Julian]

Plugs been changed lately?

 

[msavold]

I get 7550/7600 and 51/52 with four on board at sea level in our 2012 sx240...

 

[Julian]

2nd thread with a 2015 with low rpm....hummmmm

http://www.jetboaters.net/threads/2015-limited-s-with-low-rpm-issue.6387/

 

[Ronnie]

7600 to 7700 at sea level topping out at 51 to 52 mph.