Anyone running L13 + twin screw impeller + surfing in AR195?

[Ribs77]

Long story short, I've been dialing my wave in the AR195 for the better part of two seasons now. I can make a good wave, and with the L13 cone I can get the boat up to 10.5 mph, but I'm still getting some weird vibrations/cavitation at times.

It's not something stuck in the impeller - after draining ballast, I took the boat up to 40mph and 7400 rpm with two passengers and there was no vibration / cavitation. (I think it would go faster if the hull was clean, but it's wet-slipped and I don't pull it out to clean it very often.)

Anyway, the cavitation on launch really bothers me, mainly because it takes pretty precise acceleration to get to surf speed without cavitating, even with the cone. I have RideSteady but the cavitation also impacts auto-launch to the point that I can't use it.

I'm thinking about going to the twin screw impeller in the offseason, but I read a post on here about that impeller impacting his single-engine wake in a negative way. The poster said he could no longer surf ropeless with the twin screw impeller!

That would defeat the purpose of the whole thing, so I definitely want to be sure I can make a (relatively) great wave with the twin impeller. I can't find the post anymore, so I'm wondering if anyone else has run this setup.

So, the big picture.

AR195, L13 cone, about 1,000 lbs. ballast plus 2-3 passengers. If I add the twin screw impeller to this mix, will I keep the surfable wave but lose the cavitation?

Please help, it's driving me crazy

 

[Rinker2Yamaha24]

Hey! Thing we've talked on here before. I can some frame of reference... I have a 2021 AR190. For surfing, I use a 375 under the port cushion, 375 on top, and a 375 on the back platform. Wakebooster and ride steady with autolaunch. I have 0 cavitation and can surf all day with this set up 9.8mph is my sweet spot. that's with a buddy sitting in the back and me driving while #3 surfs. We're all 180-200lbs each. When I start adding folks I have to send someone to the bow to get to speed. Many more people I have to ditch the "on top of" cushion ballast bag. I'm at ~200 MSL.

The cavitation seems excessive... Maybe seal your intake tunnel and have you done a rebuild kit on plug recently? I did both when I bought my 2021 used this year. I still have the stock cone and stock impeller.

I would've thought the autolaunch would help with cavitation. Love that feature of the ride steady.

 

[anmut]

I know our boats are different, but just to give you a sense of how amazing the twin impellers are (bought mine from Leading Edge), I can put the full 750lb fat sac on the rear and run at 10mph with a few people in the boat at around 6400 rpm.

On my original stock impellers (which had some cavitation issues by the end of their life) I would be wide open at 7200 rpm to get to 10-10.5. There is an amazing amount of grab with those extra fins.

 

[Wicked92]

Get the impellar pitched correctly and there's no need for the l13 cone. They hurt my 255xd with twin scrolls.

I recommended leading edge, David Stewart. Used to own impros.

 

[Ribs77]

I know our boats are different, but just to give you a sense of how amazing the twin impellers are (bought mine from Leading Edge), I can put the full 750lb fat sac on the rear and run at 10mph with a few people in the boat at around 6400 rpm.

On my original stock impellers (which had some cavitation issues by the end of their life) I would be wide open at 7200 rpm to get to 10-10.5. There is an amazing amount of grab with those extra fins.

For what it's worth, when I get to speed (10.5) I'm running 5,800-6,000 rpm with 1,000 lbs. of ballast and ~2-3 passengers, including driver.

The issue is getting to that speed without cavitating! It requires a more delicate touch and takes longer than I want.

 

[Ribs77]

And I am more than happy to spend money on the twin impeller if it fixes this problem, but if it negatively impacts the surf wave I can't do it.

I just need someone to explain how/why the surf wave would or wouldn't be impacted by switching.

 

[Ribs77]

Hey! Thing we've talked on here before. I can some frame of reference... I have a 2021 AR190. For surfing, I use a 375 under the port cushion, 375 on top, and a 375 on the back platform. Wakebooster and ride steady with autolaunch. I have 0 cavitation and can surf all day with this set up 9.8mph is my sweet spot. that's with a buddy sitting in the back and me driving while #3 surfs. We're all 180-200lbs each. When I start adding folks I have to send someone to the bow to get to speed. Many more people I have to ditch the "on top of" cushion ballast bag. I'm at ~200 MSL.

The cavitation seems excessive... Maybe seal your intake tunnel and have you done a rebuild kit on plug recently? I did both when I bought my 2021 used this year. I still have the stock cone and stock impeller.

I would've thought the autolaunch would help with cavitation. Love that feature of the ride steady.

I have the 650 transom bag, so I use that plus 100 lbs. of lead in the surf side locker, and about 200 lbs. in the ski locker area.

I have tried sealing the intake tunnel, but I didn't remove the grate. It's possible I could do a slightly better job. The cleanout plug looks like it's in good shape - my boat is a 2021 also but I didn't see any wear around the seal when I looked at it recently.