why f 357 and fastech 382 same speed with same power?
 

I just dont understand why a newer stepped hull with 625 hp would not be faster than an old heavy 357 with 650 hp ? the SSM 3 are that much more efficient?
Ed champion confirmed on FB this 382 runs 82 mph :

http://www.offshoreonly.com/classifi...o60141-en.html



and bob barker from OSO has this post:

Thread: Share Boat pics?
by bobbarker Replies
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Re: Share Boat pics?
heres mine,
F357sr1 formula 572's 650hp stellings,speedmasters 83mph gps so far

by the way, a 357 really is a 35'7'' plus swim platform = 37'7''

a 382 has a molded platform so 382 overall length

so lenght does not make a big difference IMO...

Interesting question and comparison.
I would think the stepped hull with all things equal should be faster but surely SSM 3 could not make up this difference? wow . That then begs the question if all things really are equal in the claims.

700hp 580" motors in my hawk did 82, same power swapped into a 382, same drives...... 82 not the best hull. I don't personally like anything about them, handle weird, don't take the chop or slop all that well, obviously not that efficient.

My 2002 382 with 628hp would pull 87 with the right props. I rarely ran WOT and instead propped the boat for mid-range. Although stepped, I believe the steps are so conservative that they don't really help that much.

FYI: 628hp and 699tq fully dressed on a dyno.

Then why my 357 with 485 hp ran 62-63-64 and a 382 500 efi runs 10 mph faster?

357 is a big heavy boat, and they're usually wet. Not saying yours is, as I've seen a couple nice ones but most are wet and rotted.

Mine was dry, but 10 mph difference with siimilar smaller power and no difference with bigger power??? !!!

Jamie my 382 w 650 s from my cig pushed that 84 85 mph gps

Kevin never got it over 82, maybe he had other issues. But your cig is 5 mph faster with 150 less hp

I misunderstood what you were saying. Maybe like t500hps said the steps are very conservative and aren't as efficient as speed increases?

87 Formula 357 weighed 8950 dry, but the 97 382 fastech with the stepped hull weighs 10450 almost one ton more, its the weight that slows the 382

FWIW There's a 2009 382 with 700s in our area claims mid 90s.
What I was told.

I think you refer to a boat on Lake George - if so, it's every bit of mid 90's. I'm told it's a Kevlar hull 700/NXT package and the motors have been warmed up by Saris Racing.

Its a beautiful boat.

FYI: When I first bought my 382 it had 8 PSI Procharged 500's (830hp)........ran a best of 98 and hit 94-95 with family of 5 and 3/4 tanks. :)




(In hindsight, not sure why I didn't just leave it the way it was!)

Sure is.

My 98 382 with fresh HP500s will top out at 70 light on fuel with just me in the boat and about a foot of chop. I have the 1991 sales handbook and the 1998 book. The 91 357 with 502s and Bravo 1 spinning Mirage 3 blade 19P says 60mph, the 98 382 with same motor/drive spinning Bravo 4 blade 24P says 65-68.

Guess as they say " A turd is a turd is a turd ", You can color a turd any way you want but if it still runs like a turd it is likely still a turd. Formula has for many years dumped out the same old chit year after year with no improvements to the design. Take a straight bottom and put some new Fastech do nothing steps into it, Shebang!

I rerigged a 05 from 525 Bravos to 700 NXTs it runs 98 on GPS with a genset on a rail. But we set up our on X Dimension higher than Formula set up there's.

These numbers seem to pretty much agree with reality and my 357.
With 500HP in twins my 357 with TRS drives runs 65 and a 382 with 500 EFI and bravo runs 70. The steps are the primary difference all things being equal.
That said, I don't know how equal the original comparison is. The steps are worth some speed but then the claims are not consistent with real world numbers so I am thinking that the claims are off somewhere.

One big difference you guys are neglecting is fuel economy cruise speeds. I have a 357 with 420s and I routinely go boating with an OSO member who has a 382 with 500EFIs. Sure he has a little more power, and top speed is about 10-12 mph faster than my 60mph top.... but he's able to cruise at around 3200 RPM when I'm at 4000 for a 40 something mph cruise. To me that would make 45mph a lazy cruise instead of having the secondaries starting to open. The boats are obviously not drastically different, but the 382 hull is obviously a little faster in smooth water.

I'm guessing your 357 is spinning 3 blade vs the fastech spinning 4 blades, plus an older 420 set up usually involves a transmission vs a non trans Bravo set up. Although the steps are small, they must give a little advantage over a flat bottom. Too bad Formula never changes anything to keep up with the times and technology with their hulls. Imagine a larger step like Fountain or Cigarette. A 700/NXT 39 Top Gun runs 100-103 stock vs a 382 with 700/NXT in mid 90s with the same 18 year old hull on the 382!!!

a 357 with 3's and 650 hp...... 83??? NO WAY..... not a true reading unless engines are really 700+ at best.....

Lots of variables in there beside claimed hp: x dimension, props and set up, has the bottom been blueprinted/tweaked, weight (as noted earlier), etc. Plus these are production boats and every one is going to be a little different.

I get that I would love to see more info on that build.... That's awful fast for 357 and 650 hp

Yes, I am thinking of a 357 with 700 per side with Kammas running 86 so the claimed speed on lower power and non Kamma seems really fast to me too.

Jame, that 82 MPH was at 4900 RPM with 5 blade 28P props and getting a ton of water reversion. If the boat had dry exhaust , and was propped right, I should of gained the 600 RPM I needed.

Re propping to gain 600 rpm doesn't mean it would gain equal mph as if you just gained 600rpm with the same props. Maybe I'm just a hater. Not a fan of those hulls one bit.

Im with you on the 382 hull, Not a huge fan either. The engines made peak power at 5500 RPM. so I figured it would go faster with more RPM.