Dominator preference
03-14-2016 | 12:16 PM
#91
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
It depends a lot on the speed range in question. It is easier to gain 2-3 mph at a max speed in the 60 mph range than the same gain on a boat with a 100 mph top speed. Also there are speed barriers to hull and drive combinations. Once you hit the wall it takes huge horsepower gains to find speed. It is usually easier to do some setup or rigging changes to gain performance.
03-14-2016 | 12:18 PM
#92
Registered
Joined: Jul 2003
Posts: 1,358
Likes: 31
From: Moultonborough NH
The minor detail about going from 600 hour to completely fresh motors in my scenario seems to be getting left out also. Not to mention one of the motors had a cracked head between the valves and was pulling water. Boat ran 67-68 GPS like that before the refresh.
03-14-2016 | 12:21 PM
#94
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Joined: Jul 2003
Posts: 1,358
Likes: 31
From: Moultonborough NH
03-14-2016 | 12:32 PM
#95
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
He told me that he was looking for a bigger gain than I guesstimated so I suggested he go in a completely different direction and do further upgrades to make more power. The more we spoke about it and he realized ho much it would take that boat to go 10-15mph faster, he decided to keep it stock. I think he made an informed decision! I didn't get the business but that's just how it goes.
In your case, are the TRS really deep? If so, it's going to make speed gains more difficult. Did you pick up acceleration with the new setup vs the old? If you picked up acceleration but not much top end, there could be more gains realized in your setup than in the engines IMHO.
03-14-2016 | 07:07 PM
#96
Gold Member
Joined: Oct 2005
Posts: 11,691
Likes: 217
From: Olmsted Falls,Ohio Marblehead,Oh
TRS runs very deep, gains only go so far without raising X, the deep drives limit speeds more then power or hull in a TRS boat, a buddy had dyno [proven 830HP's in a 34 ScarabIII still only went 82... and its lighter boat then a 357, I assume you meant 357 not 353...
03-14-2016 | 07:35 PM
#99
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
Stinks about your buddys boat!
I saw that happen on a friend's Baja Force. He went from the 420's up to some 540" 750's and the boat ran no more than low 70's. My Scarab Panther was faster then it with much less power.
03-14-2016 | 07:47 PM
#100
Gold Member
Joined: Oct 2005
Posts: 11,691
Likes: 217
From: Olmsted Falls,Ohio Marblehead,Oh
it's ok that was 20 years ago, he has a 125 mph 43 Nor Tech now with 1600's
