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Thread: john ws

  1. #1
    vegas
    I have a 2000 ultra xt with a marine power 454w/SPORT PACK the boat dose about 50mph at 4500 rpm i just purched a set of lighting headers installed the boat now dose 53mph at about 4800 rpm i was hopeing for more speed for my money i also installed a holly 705 carb.

  2. #2
    fat rat
    I maybe speaking out of turn here.....but your not saying if you made any ride plate adjustments or if you got five people in the boat.....with full gear......or maybe a 110 degree day when really nothing runs like it should......maybe the test was done in ideal conditions.....just a thought....to many variables, good luck

  3. #3
    Jetmugg
    Something doesn't add up. A gain of 300 rpm should give you much more than 3 mph on top speed. How are you checking your speed? Marine speedo's are notoriously inaccurate. GPS is a much better way to measure speed. In any case, an increase of 300 rpm should give somewhere around a 10 mph increase, in my experience.
    SteveM.

  4. #4
    MikeC
    Hey SteveM! Did you ever get the GW out this weekend????
    I hope to have my RAT put back together tomorrow......... maybe take it out next weekend.
    MikeC

  5. #5
    ULTRA28
    Originally posted by vegas:
    I have a 2000 ultra xt with a marine power 454w/SPORT PACK the boat dose about 50mph at 4500 rpm i just purched a set of lighting headers installed the boat now dose 53mph at about 4800 rpm i was hopeing for more speed for my money i also installed a holly 705 carb.
    Where did you guy your Ultra? We did very few barracuda pumps at the factory. Marine Power was pushing these pumps real big back in 2000. I was not impressed with the performance out of them. Either way your boat should do about 55 mph at 4600rpm. I need to know how many people were in the boat, how much gas was in it, what elevation were you at, what was the air temperature, was the boat full of gear, etc. Also, yes there is hook in the 2000 21xt, if your intention is to get more speed, this issue must be addressed. Does the boat have a set back pump with a ride plate and shoe? Does the boat have a loader grate? Does the boat have a place diverter?

  6. #6
    vegas
    my boat was buoght from jerry vanbeck and riged by jason vanbeck thats my first problem the boat was not loaded down just 2 people in it water temp was 62 on lake mead about 2300 ft my jet has a ride plate and place diverter also a intake grate please help my wife won't let me by a new boat so soon

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