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Grady White 273 Chase w/ Twin Yamaha 150's - Underpowered???

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Grady White 273 Chase w/ Twin Yamaha 150's - Underpowered???

Old 08-30-2016, 05:32 AM
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Default Grady White 273 Chase w/ Twin Yamaha 150's - Underpowered???

I'm looking at buying a GW 2007 273 Chase with twin 2009 150's on the back with approx. 600 hours. Can anyone tell me their thoughts on this configuration?


Is it underpowered? Any known issues with these motors?

Thanks
Old 08-30-2016, 05:41 AM
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Originally Posted by Rparks31 View Post
I'm looking at buying a GW 2007 273 Chase with twin 2009 150's on the back with approx. 600 hours. Can anyone tell me their thoughts on this configuration?


Is it underpowered? Any known issues with these motors?

Thanks
Well it's not overpowered. Most 263/273 Chase were sold with twin 225s.

Based upon Yamaha performance test reports of Chase 263 with twin F225 and Advance 257 with twin 150s, I would bet the Chase 273 with f150s will top out around 43-45 MPH with a reasonable load and cruise nicely at 30-32 MPH.

Known issues with f150? Check the harmonic balancer message threads.
Old 08-30-2016, 05:44 AM
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Not sure you'll find someone here with that exact combination, and what's underpowered for some may be fine for others. Best way to tell is sea trial and see if it will meet your needs.

I have a GW 222 with a 250 OX66 and it is perfect. What is the 273 rated for?
Old 08-30-2016, 06:07 AM
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Originally Posted by Sprockets View Post
Not sure you'll find someone here with that exact combination, and what's underpowered for some may be fine for others. Best way to tell is sea trial and see if it will meet your needs.

I have a GW 222 with a 250 OX66 and it is perfect. What is the 273 rated for?
The 273 is rated for 500. 500 means TWO V6 outboards. It's underpowered with two 4-cylinder outboards making 300.
Old 08-30-2016, 06:19 AM
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Think the 273 Chase is 3975 w/o engines, dry weight.

I have a 258 Journey w/F/150's, w/o engines, dry.......4320 pounds.

It is not underpowered.
Old 08-30-2016, 06:22 AM
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I have a 263 Chase with twin 200's I'd say with anywhere near a full load your 273 will be underpowered. You can add hydrofoils which will help. I have them on my boat as I do a lot of HST for hoos with it.

A year or so ago, I re powered the boat F200 yams. The boat performs fine with those engines and my fuel efficiency increased by 25%
Old 08-30-2016, 06:22 AM
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It may be slightly underpowered with the 150's. Friend of mine has a 273 with the 225's - WOT it will run about 44-45. We just ran it from FI Inlet to Montauk and back on Friday and it runs great but I could see the 150's working hard to get it on plane.
Old 08-30-2016, 06:24 AM
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I had a 96 263 chase with 96 150 two smokes. Was real impressed on the initial sea trial as I thought the same thing. Very quick to plane even fully loaded. Topped out around 51-52 mph. Only issue I had was I never could get it to plane on one motor but I never really ran it really light either.
Old 08-30-2016, 06:33 AM
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Want to add an F150 dyno's about 165hp, F225 about 206.
Old 08-30-2016, 01:04 PM
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Thanks for all of the reply's. @MyGal, do you run your 258 with a full load quite often - or do you do mostly 1 - 2 person trips. Do you think a full tank and 6 people will create any issues planing based on your experiences?
Old 08-30-2016, 01:20 PM
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Going to sound like a broken record today...but that's a lot of boat for that power.
Old 08-30-2016, 01:59 PM
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Looking at the Yamaha bulletins they run the 273 with twin F225's and the Tournament 275 with Twin F150's. Same hull, the Tournament is 1,000 lbs. heavier. Maybe I'm being naive, but it seems like the difference in performance is not huge between the twin 150's and 225's despite the actual difference in HP's.

I'm not looking to make long runs offshore in short time, just want to make sure I'm not dogging it and don't want any trouble getting on a plane with 6 people.

275 Tournament F150's
http://yamahaoutboards.com/sites/def...-t-f150txr.pdf

273 Chase F225's
http://yamahaoutboards.com/sites/def...02-55-RW-B.pdf

273 Chase F200's
http://yamahaoutboards.com/sites/def...0117-GRW-A.pdf
Attached Images
Old 08-30-2016, 02:10 PM
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I own a 2007 Sea Hunt Triton 260 with twin F150s. 550 hrs. It does ok, but, it is by no means a speed demon. Would much prefer twin 200s, minimum,...
Old 08-30-2016, 02:37 PM
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I've rented a 273 with F150s and F200s (after a repower). Neither had props that were optimal. F150s were fine unless you plan on running fully loaded most of the time. WOT was 39-40 on the F150s and 43-44 on the F200s with similar loads.
Old 08-30-2016, 03:45 PM
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Looking at the Yamaha bulletins they run the 273 with twin F225's and the Tournament 275 with Twin F150's. Same hull, the Tournament is 1,000 lbs. heavier. Maybe I'm being naive, but it seems like the difference in performance is not huge between the twin 150's and 225's despite the actual difference in HP's.

I'm not looking to make long runs offshore in short time, just want to make sure I'm not dogging it and don't want any trouble getting on a plane with 6 people.


NO way I'd be happy cruising 22.6 miles per hour for optimum efficiency.( according to the bulletin )

They'd be singing at 5k the entire time just to feel like you're getting somewhere.
Old 08-30-2016, 05:41 PM
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Not underpowered. Most of the Grady 27', 8'6" wide twin-engine boats were powered with twin 150s (Islander, Freedom). Also the Gulfstream 23, which I believe has the same wetted surface area. As someone noted, the F150s are strong engines (putting out about 165 hp) and the 225s were weak 225s. Twin 200s might be a bit better but the twin 150s were not underpowered.
Old 08-30-2016, 05:49 PM
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Originally Posted by Rparks31 View Post
Thanks for all of the reply's. @MyGal, do you run your 258 with a full load quite often - or do you do mostly 1 - 2 person trips. Do you think a full tank and 6 people will create any issues planing based on your experiences?
I have aux tank. Run with 4 mostly.

Full fuel + 6 is not a problem. This vessel has no performance issues.
Old 08-30-2016, 07:18 PM
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Originally Posted by Rparks31 View Post
I'm looking at buying a GW 2007 273 Chase with twin 2009 150's on the back with approx. 600 hours. Can anyone tell me their thoughts on this configuration?


Is it underpowered? Any known issues with these motors?

Thanks

The F150's will do the job... I'd be more worried about the wood Grady still uses to build their boat. Yes, since 97' they did lots better job sealing their plywood in their boats, but depending on how the boat has been treated... Holes drilled and not sealed right can be big problems... Have the boat looked over by a Marine Surveyor that knows Grady's..
Old 08-30-2016, 08:31 PM
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Bought our 200K Islander 270 new, with a single 250hp OX66. Underpowered.

Put 465hrs on the single in first three seasons, then repo were with twin F150s. Now have 1500hrs on the twins.

WOT is just over 37kts with a moderate load. Cruise comfortably at 26-28kts with full fishing load, four pax, getting 1.6-1.8nmpg. Not a rocket ship, but not underpowered. Dozens of trips to the Norfolk Canyon before we brought her to Florida in April.

A friend has the same boat, 2005 model, with twin F250s. Very fast and better fuel economy. Same as another friend with a newer 275 with twin F250s.
Old 08-30-2016, 08:42 PM
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No first hand experience. But it does sound underpowered.

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