What’s up guys. Really need some help on slalom setup here. We bought the GS20 because we were told it surfs and skis very well. It took me about a month to perfect my surf setup and now I’m moving on to slalom. I’ve only ever skied a 210 closed bow Nautique. I am 230lbs and ski at 15 off, 32mph. Last night I made several lame attempts but couldn’t get out of the hole. 600lbs of people in the boat (not ideal) but still thought the ZR4 would have the balls. I drove for a friend who is about 190. Same issue. When I hammer the throttle boat just spins. Won’t jump out of the hole. Using the factory NCRS ski setting and have the plane assist on high. What are we doing wrong??
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Senior Member of PLANETNAUTIQUE
- May 2010
- 538
- Lake Tahoe
- 2014 210 2019 GS22, 2017 GS20, 2000 Air Nautique
what is your elevation?
I had my GS20 at 6300ft with a 1235 prop and ZR4. I wight about 210#. It could pull me out no problem.
Surfing on the other hand was a joke. The boat simply could not get to or hold a surf speed with more than 2 or 3 people in the boat with full ballast.
If you are running the stock prop, (645 I believe) start there. You want to drop pitch
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If I understand you correctly you're experiencing cavitation when you're trying to get out of the hole. If that's correct it sounds to me like you may have too much prop on the boat and you're not able to hook up (spinning isn't winning). I'd find out what prop you have on the boat now and either contact your dealer or Acme (or OJ, I don't know who the Nautique prop wizard is. For MC it's Eric at OJ) to see what they recommend.
Be aware that there is always a trade off when trying to do it all. I run the stock recommended prop on my 200 Sport Nautique. It does it all very good but it doesn't do anything great. I knew this going in so I'm fine with what I have. I mean how many boats can you slalom in the morning then flip the switches and surf in the afternoon?
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Senior Member of PLANETNAUTIQUE
- May 2010
- 538
- Lake Tahoe
- 2014 210 2019 GS22, 2017 GS20, 2000 Air Nautique
Originally posted by Interjon View PostGS22 at sea level. We use it primarily to ski. Never had any issues. Plenty of power, with a weighted boat or not. Snatched up a 260# buddy on a pretty aggressive ski last week.
i am pretty sure the gs20 comes with a 645 unless they changed it.
the 645 is a 13.25x16. way too much pitch and a small diameter IMO
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My issue is when I add weight over integrated ballasts. Can barely get going. 2020 GS20, elevation is 560. I just replaced prop with high altitude and heavy weight from wakemakers.com, but I haven't got it in the water yet.
With additional sacs in back and front i cant go more than 8mph on surf, and wake boarding it can't even get going.
But I've added a lot of weight. The weight you speak of I've never had an issue
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Originally posted by JACOB11379 View PostMy issue is when I add weight over integrated ballasts. Can barely get going. 2020 GS20, elevation is 560. I just replaced prop with high altitude and heavy weight from wakemakers.com, but I haven't got it in the water yet.
With additional sacs in back and front i cant go more than 8mph on surf, and wake boarding it can't even get going.
But I've added a lot of weight. The weight you speak of I've never had an issue
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Originally posted by Viperchad View PostWhen I hammer the throttle boat just spins.Last edited by jjackkrash; 07-03-2020, 09:58 AM.
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I have a 2019 GS 20 and same motor. Shocked to hear this. With 850-900 lbs of people in the boat, it pulls up a 280 lb slalom skiier fine.
The only lack of power we've experienced can be attributed to being extremely heavy for surfing. With full stock ballast plus an additional 800 lbs ballast aft, and a boat full of people, we need a couple people in the bow for the boat to accelerate adequately to 11 MPH.
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