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  1. #1
    Member
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    Jun 2015
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    texas ,lake fork
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    183

  2. Member
    Join Date
    Mar 2005
    Location
    waynesville
    Posts
    267
    #2
    There nice. But there $10,000. Then add a lu or shortshaft set up to a sportmaster. Might as well buy the Mercury 400 ros scat cat
    Allison XB 2002, 2.5 280

  3. Member K-DAWG's Avatar
    Join Date
    Apr 2007
    Location
    Kingsland, GA
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    7,015
    #3
    Did you ever get the one on your Allison XB-21 running? How did it run?

  4. Member
    Join Date
    Jun 2015
    Location
    texas ,lake fork
    Posts
    183
    #4
    yes it has been running for 62 hours now, turning a 36 bravo at 95 mph and 5200 rpm, we have lost the back end 4 times at 93 to 95, we think since the prop is so big it is paddle wheeling, we can see it lift the rear on the go pro just as she blows out, tomoro we are goin to spin a smaller prop to the limiter if we have to and see if that is our problem , hole shot is maybe 1.5 seconds midrange is stupid, no top end we can only get to about 5200 before she lets loose, we will figure it out. running stock case with nose cone from nizpro low water pickup it has been tested to 121 on other boats runs fine, this allison is a different animal , when we do get it hooked up we will post video, i owned a mercury 400 ros it weighed 130 pounds more and not even close on torgue and power to the nizpro, this is crazy powerful .goin to try a 30 tomoro should see 98 if no problems will go to a 32 on monday that should get us to 104 at 6400, 0- 90 is 11.7 seconds , they cant be bought for 10 grand, they run 13.295 the first two sold the day they arrived one boat picked up 19 mph the other 22 mph, expecting 3 more coming in this thursday is what tracking is showing, sorry im rambling just wanted to give an update.

  5. Member
    Join Date
    May 2006
    Location
    Sturgeon Falls, ON
    Posts
    1,616
    #5
    Quote Originally Posted by rifles11 View Post
    yes it has been running for 62 hours now, turning a 36 bravo at 95 mph and 5200 rpm, we have lost the back end 4 times at 93 to 95, we think since the prop is so big it is paddle wheeling, we can see it lift the rear on the go pro just as she blows out, tomoro we are goin to spin a smaller prop to the limiter if we have to and see if that is our problem , hole shot is maybe 1.5 seconds midrange is stupid, no top end we can only get to about 5200 before she lets loose, we will figure it out. running stock case with nose cone from nizpro low water pickup it has been tested to 121 on other boats runs fine, this allison is a different animal , when we do get it hooked up we will post video, i owned a mercury 400 ros it weighed 130 pounds more and not even close on torgue and power to the nizpro, this is crazy powerful .goin to try a 30 tomoro should see 98 if no problems will go to a 32 on monday that should get us to 104 at 6400, 0- 90 is 11.7 seconds , they cant be bought for 10 grand, they run 13.295 the first two sold the day they arrived one boat picked up 19 mph the other 22 mph, expecting 3 more coming in this thursday is what tracking is showing, sorry im rambling just wanted to give an update.
    You had a 400R. Not a ROS.

  6. Member
    Join Date
    Dec 2006
    Location
    St. Louis
    Posts
    6,699
    #6
    Very impressive.

    30/32 are should feel even better

  7. Member
    Join Date
    Feb 2007
    Location
    Waterloo Iowa
    Posts
    3,769
    #7
    It will be interesting to see how well Yamaha over engineered the power head. Really the whole engine. Is the sport master gear case designed to run that amount of torque? When adding enough boost to almost double the HP you are going to find the weak link.

  8. Member
    Join Date
    Dec 2006
    Location
    St. Louis
    Posts
    6,699
    #8
    I doubt sporty was designed to handle it. Remember the 350 and 400 require a different more robust sportmasr

  9. Member
    Join Date
    Oct 2015
    Location
    Iowa
    Posts
    188
    #9
    Quote Originally Posted by xb03fs View Post
    I doubt sporty was designed to handle it. Remember the 350 and 400 require a different more robust sportmasr
    And they are still having issues keep propshafts in these from what I hear.

  10. Member
    Join Date
    Dec 2006
    Location
    St. Louis
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    6,699
    #10
    Yup

  11. Member River Rocket's Avatar
    Join Date
    Jul 2004
    Location
    Blaine, MN
    Posts
    1,021
    #11
    The motor is running a coned yamaha lower. I believe it was done by Wolf.
    Allison XB21 2+2
    Mercury 300R