SX 192 Mods

[Tom V]

Try it out see how it works, you will see the exiting water should be much cooler than the original water outlet. The fizzle and frozen boost only use 1 outlet.

 

[sx998]

the SVHO intercooler is installed. Easy direct replacement. Just a couple of cooling lines, three 14mm bolts and the two air hoses. Thats all. Easy cheesy. I'll have it on the water this Sunday if the weather permits.

 

[Tom V]

Looking forward to hear what you think, Keep us posted.

 

[sx998]

Intercooler test has been put off until Monday. I'm working Sunday.

So does the AR/SX192 have a boost limiter? I think that's what I read. What PSI do they produce and when would the limiter kick in? Does the limiter make it worthless to buy a higher PSI supercharger wheel? Has anyone with the boat (not ski) changed out the wheel?

I'm not interested in a making a race boat, just wanting to know if I could add some easy power for less than $1,000.

 

[sx998]

2015 SX192 - Only mod is the SVHO intercooler. Still have the ribbon. Pump gas 87 with ethanol. Water temperature is Florida water in July. It's hot. No chop. Some wind.
Ran at 50mph at the start of the day. Dropped to 47 on the way back. It helped the heat soak but didn't fix it completely. I'll take it. It's a little bit better. Next I'll take out the ribbon.

 

[mraz72]

Is there a list of parts people are using for the intercooler upgrade? I might try to tackle that one next. I have the extra battery done, next is stereo upgrade, then onto performance.

 

[sx998]

Is there a list of parts people are using for the intercooler upgrade? I might try to tackle that one next. I have the extra battery done, next is stereo upgrade, then onto performance.

Page one, first post.

 

[Tom V]

How hot is the intercooler water coming out the pisser, if its cool then the SVHO cooler is working properly, the 47-50 is what the boat runs, the re-pitching of the impeller should give you 50+ all the time. I have loaded the boat to the max, with people and coolers and it still runs 47-48 mph now, its got tons of torque so I know the impeller has room to bring the top end into the 50s with no problem, Before I did the frozen boost cooler 4 adults or a bunch of Dive gear will drag the boat down to 35mph max, That problem is gone. 47-50 is real good and tons of bottom end. Its time for me to re-pitch too, will send my prop out to impros and have Dave do his magic. If your rpms are staying around 7600 to 7700 rpms then the boat is running all out and the impeller has room to get a few degree re-pitch without dragging down the engine rpms much, if so at all.

 

[Jetswu87]

After reading this thread I've been keeping an eye on eBay from time to time for intercoolers.

Scored a 2015 SVHO take off with 3 hours for $125 today. I haven't even had my boat out by 4 times but this looks to be an easy upgrade.

Now if we could get Riva on board to tune these things :-/

 

[Tom V]

Thats a great find on ebay, I picked up an extra one for $250, never used.

 

[sx998]

Went out again the other day. SVHO intercooler is keeping me happy. Should've come this way from the factory.

 

[haknslash]

Will the intercooler swap with the SVHO IC void my warranty?

Best speed I've seen with my boat is 45 MPH @ 7500 RPM. Within a little while the heat soak sets in and I'm at 42 MPH @ 7200 RPM.

 

[sx998]

Will the intercooler swap with the SVHO IC void my warranty?

Best speed I've seen with my boat is 45 MPH @ 7500 RPM. Within a little while the heat soak sets in and I'm at 42 MPH @ 7200 RPM.

Probably so but I'm not sure. If anything happens just reinstall the stock intercooler before taking it to the dealer.
The bigger intercooler is well worth the effort.

 

[Jetswu87]

So the SVHO intercooler has two water exhaust ports. Nothing new to you guys but why? it only has one water intake and its the same size. The two water exhausts are connected inside the cooler. Correct me if i'm wrong here but I don't see any reason to why I can't "T" the two water exhausts together into one exhaust hose. It'll be the same size water intake and exhaust hose just like the stock intercooler had. I can't justify cutting an extra hole in the hull.

I'm with you here, with the warranty on the boat I want to make this easily reversible. I took a closer look at the lines today, did you just Y them together? I was curious if the two exits were connected on the insider of the intercooler.

Any pics?

 

[sx998]

I'm with you here, with the warranty on the boat I want to make this easily reversible. I took a closer look at the lines today, did you just Y them together? I was curious if the two exits were connected on the insider of the intercooler.

Any pics?

Yes they are connected on the inside. I blew air into the single intake and it would come out both exhausts or just one if I covered the other. So I just connected the two exhausts into one and used the factory tubing to run out the hull. No pics right now.

 

[OzarkGunGuy]

Going to wade into this thread very late in the game.... I had a boat fire last week on my 15yo Larson, wasn't bad, but we had just gotten to the lake to spend a week with the kids, so I went to the closest marina, took advantage of the low interest rate, and picked up an AR192. It's the 1st jet boat I've played with in 20 years and, I have to admit with myself, my wife, and 4 kids, I was pretty disappointed at the performance. We were only getting 35mph loaded with 6 people and standard gear close to max load out. Not really what I was expecting out of a supercharged Yamaha. My wife and three of the boys are heading out on a week long mission trip this weekend, so I plan to run it down to the lake and spend a few hours shaking it out properly and going over everything to try and find out what going on. It had horrible power pulling a tube or a skier, everyone got up, but it was taking the better part of 10 seconds to get on plane. With no boost gauge and virtually no useful information being provided by th boat, I need a better platform to understand what's happening with this thing.

I have read this thread from start to finish and I'm sold on an intercooler upgrade, but I'd like to pick your guys brains if I can?

1st, I bought the extended warranty because it's a supercharged boat, but the performance, quite frankly, sucks. So, is the SVHO IC the best option for going with an upgrade, just so I can take it back to stock if warranty repair is needed?

Also, is there some sort of an instrument package that can be had to get more info? I saw several pages back that someone was using diagnostic software to do data capture, but is there any available hardware that can be attached to the boat to monitor the thing?

Next, I've read about an anode somewhere in the cooling system, I doubt this boat will ever see salt water, so is it a good idea to remove that for better Water flow to improve cooling? Or am I reading that out of context.

Last, is there an aftermarket setup to improve cold airflow into the engine compartment? I'm not really excited about the prospect of having to work for hours on my brand new boat, but the performance is atrocious and I have to do something.

Any help is really appreciated.

 

[swatski]

Going to wade into this thread very late in the game.... I had a boat fire last week on my 15yo Larson, wasn't bad, but we had just gotten to the lake to spend a week with the kids, so I went to the closest marina, took advantage of the low interest rate, and picked up an AR192. It's the 1st jet boat I've played with in 20 years and, I have to admit with myself, my wife, and 4 kids, I was pretty disappointed at the performance. We were only getting 35mph loaded with 6 people and standard gear close to max load out. Not really what I was expecting out of a supercharged Yamaha. My wife and three of the boys are heading out on a week long mission trip this weekend, so I plan to run it down to the lake and spend a few hours shaking it out properly and going over everything to try and find out what going on. It had horrible power pulling a tube or a skier, everyone got up, but it was taking the better part of 10 seconds to get on plane. With no boost gauge and virtually no useful information being provided by th boat, I need a better platform to understand what's happening with this thing.

I have read this thread from start to finish and I'm sold on an intercooler upgrade, but I'd like to pick your guys brains if I can?

1st, I bought the extended warranty because it's a supercharged boat, but the performance, quite frankly, sucks. So, is the SVHO IC the best option for going with an upgrade, just so I can take it back to stock if warranty repair is needed?

Also, is there some sort of an instrument package that can be had to get more info? I saw several pages back that someone was using diagnostic software to do data capture, but is there any available hardware that can be attached to the boat to monitor the thing?

Next, I've read about an anode somewhere in the cooling system, I doubt this boat will ever see salt water, so is it a good idea to remove that for better Water flow to improve cooling? Or am I reading that out of context.

Last, is there an aftermarket setup to improve cold airflow into the engine compartment? I'm not really excited about the prospect of having to work for hours on my brand new boat, but the performance is atrocious and I have to do something.

Any help is really appreciated.

@OzarkGunGuy Welcome to the gang, glad you found this forum!

I don't know if any gauges would help diagnose any problems - IMHO you have two issues to potentially address.
One is heat soak, you already know what to do.
The other, "It had horrible power pulling a tube or a skier, everyone got up, but it was taking the better part of 10 seconds to get on plane." That part concerns me.
When doing that, do you find the engine hitting the rev limiter repeatedly? - sounds something like "wha-wha-wha" - indicating cavitation / impeller slippage (think tires spinning in mud or snow)? It could be something simple, like you may have something inside the pump that is causing it. Could be a twig, or missing sealant - that permits air to be sucked into the pump, usually between the wear ring and the transom. Unfortunately, the sealant work quality is pretty bad in Yamaha.
One remedy that worked wonders for me was the anti-cavitation Lucky 13 cone. I posted about my experience dialing it in here in this forum. It is a bit of work, but man, the thing is amazing - my boat when finally tuned up would not cavitate even going WOT from a full stop.

EDIT: I just reread your post, something is not right. I know that feeling, the spinning wheels, I hated it with some of my setups - when you try to pull someone and the boat just will not plane...

With your boat completely stock you should be planning in under 3sec and pulling the arms off of your skiers/boarders, if you are not careful. I bet you have some cavitation issues in the pump.

 

[swatski]

@OzarkGunGuy check out this thread, post #25 has some video clips that illustrate the issue. You can hear the difference in pump loading in the firs few seconds of each clip. That is NO BS!
And no, you do not NEED to bore your venturi, it is a simple completely reversible mod in it's basic form.
https://jetboaters.net/threads/anyo...ce-adjustable-pump-cone-in-a-boat.7967/page-2

 

[Bruce]

Welcome Aboard, as @swatski pointed out it sounds like you have something in your jet drive causing cavitation.

 

[OzarkGunGuy]

Thanks for the welcome and the help guys! I talked to my oldest son who rode in the back all day, l let him listen to the different videos and he said he wasn't hearing the boat hit the rev limiter like that. That being said, I'd still like to do the mod to prevent cavitation, but, I'm not 100% sure that's the issue in dealing with. I'm going to run down to the lake on Saturday and take it out for a spin and get more details.