There is a lively discussion going on over on the waterskiforum website about none other than our most favorite topic: Zero Off. I have never really had the chance to experience it until this week. I do not ski it and it is very rare that I drive a boat with it. First thing I noticed driving a 2009 SN with ZO installed and a PCM 343 engine was how incredibly responsive it is. I normally drive a 98 SN with a GT40 engine. Path straight down the middle of the course, maybe a slight turning of the nose when the skier switches edge not much though since the skier is only 100 lbs. and runs mid 32 off's. So, all in all pretty much right down the middle. What I have noticed with the ZO powered boats is that if you deviate from a direct center line the boat will lurch forward with the nose coming upward. And it doesn't take much, maybe a couple of inches. This would make sense to me since I believe the course is mapped and GPS is insuring that the boat goes exactly that speed from point a to b. So, it seems to me if the boat driver does not drive perfectly straight, he or she will cause the boat to surge more than it normally would. Amazing to me that a slight deviation could cause such a drastic increase in speed. Thus, this is why the heavier skiers are getting hammered. The drivers are trying to counter only to cause much more acceleration. I think the SN 200 design is trying to address this with better tracking and higher rpms. Hopefully, some tournament certified drivers will chime in on this and give their expertise and opinions on this subject.Â