Superjet exhaust "power sleeve"

[Jhucke]

Anyone have experience with running these? 2MPH over stock is a BOLD claim.

http://www.elprofessor.fr/index.php?id_product=2638&controller=product&id_lang=2

If this is true, it's hard to believe this is not talked about more. Seem to be hard to find, but look like a part that could easily be made on a lathe.

 

[Big Kahuna]

"Up to 2 MPH". I ran one in my SXR (Maccracing), that along with all the other small mods for Stock Class, I had a high 50-low 51 mph running SXR. Never ran on in a SJ.

 

[Jhucke]

"Up to 2 MPH". I ran one in my SXR (Maccracing), that along with all the other small mods for Stock Class, I had a high 50's running SXR. Never ran on in a SJ.

High 50's stock class SXR, WHAT?

Also even 1mph for a stock boat would be huge, not to mention extremely cost effective mod for a lites boat.

 

[Big Kahuna]

50.9 mph.
51 occasionally!!!!!! Yeah, that read wrong!

 

[Big Kahuna]

I have another SXR that we restored (Broke down in salt water never flushed). I can barely get to 48 with the sleeve!!!!!!!!!!! But I think it is the motor. Same mods as my old race boat.......... with exception of the pump plug mod.

 

[Jhucke]

I have another SXR that we restored (Broke down in salt water never flushed). I can barely get to 48 with the sleeve!!!!!!!!!!! But I think it is the motor. Same mods as my old race boat.......... with exception of the pump plug mod.

Yeah no worries. I had a feeling you meant a high tenths place.

 

[Quinc]

I think @Rdrttoy sells something similar?

 

[Jhucke]

I think @Rdrttoy sells something similar?

Well I think worx officially makes a product. Just wanted to see if people were willing to share their experiences. I would imagine something like this needs some tuning to make work properly. Just like anything

 

[marco.main9]

Well I think worx officially makes a product. Just wanted to see if people were willing to share their experiences. I would imagine something like this needs some tuning to make work properly. Just like anything

Following up!! Let’s us know if it works on SJ.

 

[user_error]

I made my own, seems to work ok. I calculated the dimensions based on an an sxr stuffer I had lying around.

I gps'd low 50's, never more than 50.3. I'd like to compare it to an actual Worx unit or another one specifically made for a sj.

 

[High Speed Industries]

I've tried 4 different exhaust sleeves. Some work better than others. You need to tune the whole setup as a package to get max performance.

We sell a kit with the sleeve, water routing, and a few other things to wake up the stock class skis.

 

[Jhucke]

I made my own, seems to work ok. I calculated the dimensions based on an an sxr stuffer I had lying around.

I gps'd low 50's, never more than 50.3. I'd like to compare it to an actual Worx unit or another one specifically made for a sj.

As would I. A specific restrictor geometry would certainly yield the best results and RPM, unfortunately I don't know enough about two stroke expansion chambers to do any real engineering work and calculations on how to achieve this. I would imagine it is something along the lines of optimizing the sound pressure wave, but by also not introducing excessive back pressure. I realize that most "engineering" on standup jetskis is trial and error 98% of the time, though.. Would be interesting to set up a simulation for this though, boundary conditions would be difficult! Obviously cost to performance ratio would be terrible.

I've tried 4 different exhaust sleeves. Some work better than others. You need to tune the whole setup as a package to get max performance.

We sell a kit with the sleeve, water routing, and a few other things to wake up the stock class skis.

I would be interested in hearing more about this. Is this super secret stuff? I understand how competitive lites class is.. Do you stock fittings to bypass water out of the jacket boot? I am running something like this already, but the fitting I am using is not a very big bypass, I don't think I am drying it out enough.

 

[SexPanther]

I have one of these and am about to start testing it. Does anyone have any other suggestions for modifications I can make to accentuate the mod. If it’s top secret maybe just hit me with the private message?

 

[kevbo]

Kawasakis stock pipe has a little bit of tuning, I could not feel much in the Yamaha. Tuned pipes need some level of back pressure. Untuned exhausts lose power with any back pressure. A manufacturer can make products that hurt performance and people would still buy it.

 

[orangefinger]

u can also loose some weight and save yourself the money spent on burgers and on parts ..... that gain is tots ridic ....

 

[fastgtfairlane]

A friend put one on his superjet and noticed an increase in rpm and top end power with the worx one. He has a 64x top end with oem 38s, with open style flame arrestors.