Quote Originally Posted by Ryann View Post
That sounds oddly familiar. The rpm on mine was limited to about 3600 as well surfing. Now I didn’t try it with the cruise control off. My wife was complaining about it feeling way less powerful than our 2018 and that at times it wouldn’t get up to or stay at 11.4 mph surfing. Double checked all settings. I’ll stay tuned and run the boat again next weekend. Maybe there’s a secret break in rpm limit we don’t know about. Not sure about this one.
Ryan,

The tech came up and installed a new prop. We are at 5000' elevation and have the 450. I think we had the 15x11.5 prop and he switched it out to a 16x13 prop. He said that the Zero Off will limit the rpms when it senses that the engine is working at max and not go above it. Putting in a more aggressive prop made it seem like the engine was getting less stress to the Zero Off sensors. I also discovered with a larger crew that if you accelerate early on then it will get to surfing speed easier.

Zac at Supra wrote this to me as well:

Yes Zero off has parameters that “limit” the engine and how hard it pushes the engine, it is strange that this is happening on your boat because we haven’t seen this on other stock boats. We can occasionally extremely overload our boats and get to do this but I wouldn’t say your boat is that overloaded. That is why I believe a new prop will solve most of this.

Another problem solving step that you could do to help us get more information is to unplug the gps puck that is in front of the starboard side windshield. If you are in a large canyon or not receiving GPS signal then the cruise system is relying on paddlewheel cruise which runs through a different software. So if you could unplug the gps in front of the windshield and the boat does the same thing it would lead me to believe the problem lies elsewhere, but If you unplug the gps and the problem goes away then there is something in the zero off logic that is limiting the engine.

Also I wanted some clarification on the boat going from 4000 rpms to <1000 rpm situation. That sounds extremely strange to me and seems like it needs to be addressed. I would say you need to take the boat into your dealer and get them to hook up diacom and see if any codes have popped up.

Matt suggested the following after above comments:

To add to this, another thought I had was check the GPS satellite status.

I have been on a boat where if you take off and the GPS has NOT locked in, then the boat can be in paddlewheel mode. The boat will accelerate and might be going a high rpm. BUT, when GPS locks in, it can take a second and the engine can drastically reduce rpm because it thinks it needs to reduce rpm to reduce speed. Again, it seems to happen the most drastic as soon as GPS locks in, but if the boat does this, then returns to correct speed, it could also be a sign of poor GPS signal, or maybe an issue with the GPS puck.

As Zac said, taking that out of the equation can tell us quite a bit.