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Quote:

Originally Posted by kvogt (Post 4415590)

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.

Agreed! I've had the unfortunate pleasure of hitting those barriers before.

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.

Did this happen in the boat in your profile pic? (Cafe Racer)

Quote:

Originally Posted by Panther (Post 4415591)

One last example, that is exactly why I asked him what kind of boat it was. But it wasn't made clear to me. You seem to know, but I don't.

Sorry for the omission. 87 Formula 311SR1 with 420's and TRS drives.

Quote:

Originally Posted by donzi matt (Post 4415598)

Sorry for the omission. 87 Formula 311SR1 with 420's and TRS drives.

A friend who has a 353SR1 recently spoke with me about upgrading his 420's to 500's. For the amount of work I had to do and the money involved for not much of a gain, I suggested to him that it probably wasn't worth the money to do the upgrade. Especially since I could not guarantee how much he would gain.

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.

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...

311 with 420s and TRS drives should run 72mph.

68 ish GPS

. 72 on factory speedo..

Quote:

Originally Posted by kvogt (Post 4415753)

311 with 420s and TRS drives should run 72mph.

Quote:

Originally Posted by Full Force (Post 4415749)

Yes, I meant 357.

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.

it's ok that was 20 years ago, he has a 125 mph 43 Nor Tech now with 1600's

Quote:

Originally Posted by Panther (Post 4415760)