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

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

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Old 01-15-2015, 07:48 AM
  #21
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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.
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Old 01-15-2015, 09:49 AM
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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!!!
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Old 01-15-2015, 02:03 PM
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a 357 with 3's and 650 hp...... 83??? NO WAY..... not a true reading unless engines are really 700+ at best.....
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Old 01-16-2015, 06:15 AM
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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.
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Old 01-16-2015, 06:22 AM
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I get that I would love to see more info on that build.... That's awful fast for 357 and 650 hp
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Old 01-16-2015, 06:37 AM
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Originally Posted by Full Force View Post
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.
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Old 01-16-2015, 07:01 AM
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Originally Posted by lil red View Post
Kevin never got it over 82, maybe he had other issues. But your cig is 5 mph faster with 150 less hp
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.
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Old 01-16-2015, 07:21 AM
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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.
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Old 01-16-2015, 07:37 AM
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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.
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