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The Mariah Owners Club » Original Mariah Boats, Inc. » Original Mariah Talk

top speeds at wot. what are people getting for max speed?

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Old 12-05-2012, 10:07 PM   #31
 
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Default Re: top speeds at wot. what are people getting for max speed?
thought the safe max rpm on the V6 was 4600/4700rpm. wouldn't push tho's rev's for too long.
sorry, slow posting.....lol
Last edited by Andy b; 12-05-2012 at 10:10 PM.
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    • Old 12-06-2012, 12:10 AM   #32

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    Default Re: top speeds at wot. what are people getting for max speed?
    Quote:
    Originally Posted by Andy b View Post
    thought the safe max rpm on the V6 was 4600/4700rpm. wouldn't push tho's rev's for too long.
    sorry, slow posting.....lol
    4400 - 4800 is the recommended RPM range for the 4.3 Mercruiser. I'm not sure if there is a difference with the Volvo version.
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    Old 12-06-2012, 02:43 AM   #33

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    Default Re: top speeds at wot. what are people getting for max speed?
    Hi People, been a while since I posted anything. 1998 Z260 MCC, 7.4 MPI, Bravo III, 4,600 RPM, 22P, best I ever saw is 41.6 MPH on GPS. I thought that was pretty respectable for a 7,000 lb boat plus all the stuff stored in the storage compartments, about 75 gal. gas, along with the generator.
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    Old 12-27-2012, 11:40 PM   #34

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    Default Re: top speeds at wot. what are people getting for max speed?
    I have a 98 Mariah 180 shabah with a 19d prop and I get around 45-50 max depending on load. Have a 4.3L 190hp mercruiser.
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    Old 07-24-2013, 02:01 PM   #35
     
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    Default Re: top speeds at wot. what are people getting for max speed?
    1999 z280 7.4 mpi bravo III, 22 pitch props 4400 rpms loaded or empty 38 mph,on gps I've been chasing 5 mph since the day I bought the boat!!!! Just installed corsa silent choice exhaust, didn't get ANY PERFOMANCE out of it. Thinking on going down to 20 pitched props to get more rpm?
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    Old 07-24-2013, 02:54 PM   #36
     
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    Default Re: top speeds at wot. what are people getting for max speed?
    You installed silent choice on a Z280? This I gotta see...

    We've talked about this before, this boat is heavy and you can't expect it to be getting any record breaking speeds. I replied to your other post with some info on props. Also check out Mercruiser's site, they have a prop calculator that may help you find the right prop to get another MPH or two. Just know that it'll likely affect other things, to get speed you'll need to give up holeshot, planing time, and fuel economy.
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    Old 07-24-2013, 03:24 PM   #37
     
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    Default Re: top speeds at wot. what are people getting for max speed?
    Chris I don't know how to put up pics o video, you should see the look on the sport boat faces, lol it sounds good. I want to sell this boat but my wife won't let me. I got a line on a whipple supercharger, for a good deal I think that's next

    Z280 Silent Choice Exhaust Clip1

    Z280 Silent Choice Exhaust Clip2
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    Old 07-24-2013, 03:33 PM   #38
     
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    Default Re: top speeds at wot. what are people getting for max speed?
    I would seriously urge you to do some hefty reading on supercharging the 7.4L MPI engine, especially one as old as ours. Check offshoreonly.com and read some of the stories...
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    Old 07-25-2013, 12:48 AM   #39

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    Default Re: top speeds at wot. what are people getting for max speed?
    I got a 03 sx 19 with a 5.7. I will hit 55 with a 19p ss prop at 4800 Rpm on GPS.
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    Old 07-25-2013, 01:20 AM   #40
     
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    Default Re: top speeds at wot. what are people getting for max speed?
    Hey Warner, out of curiosity what elevation are you at?

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