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Old 08-18-2010, 11:47 AM
eurosysytem0's Avatar
eurosysytem0 eurosysytem0 is offline
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X7- Disappointing performance

Hi Guys. First thanks for the advice received on the reason for the 12.5 x 12 four blade prop on my (new to me with 84hrs on the clock)2005 X7 with a 350 MCX engine. I am now in the position with Mastercraft where they are telling me to go to a UK dealer. My problem is that at 5100+ revs with just me in boat and a "perfect propeller" the boat only just reaches 40 mph (Checked with a GPS).

This performance is no better than my 1988 prostar powerslot with a 240 351 ford Inmar engine.
I believed the X7 would do circa 45 to 50.

Can any other X7 owners give me a view of their top end performace.
regards
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  #2  
Old 08-18-2010, 11:52 AM
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Same boat as yours in the Prostar apparel, but I top out at 45mph with no gear and just me in the boat. Speed drops down to 42ish with gear and 3 or 4 people.
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  #3  
Old 08-18-2010, 11:53 AM
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mramerman mramerman is offline
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Boat: 2010 Mastercraft X-14v, MCX 350 (former owner of 1997 MC PS190, LT1).
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I have a '10 X14v. I do not know my prop off hand, although I know it is smaller than my former boat 1997 PS190 with LT1. This boat hits a top-end of 45 mph. It does weigh over 1,000 lbs more than my last boat. While I am sure a larger prop would push me beyond 50 like my old boat... i would sacrifice pull power out of the hole... and at the end of the day, I am all about what the boat can do between 0 - 36 mph. I don't care much about anything beyond that. Just my $0.02.
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Old 08-18-2010, 11:54 AM
lettmeknow lettmeknow is offline
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Last time I checked , an x7 is a ski boat !! Not a racing boat
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Old 08-18-2010, 11:58 AM
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92 190 PS 92 190 PS is offline
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Quote:
Originally Posted by lettmeknow View Post
Last time I checked , an x7 is a ski boat !! Not a racing boat
Understood, but for those of us that barefoot top end is a big deal and 40 is pushing it for many of us. Sad to say, but the only way to avoid issues with top end on a 197 is to go beyond the MCX in the engine upgrade. By the way I'm with Euro, my 92 190 runs 47 loaded with the 351 HO. Would pull barefooters at 43 to 44 if they wanted/needed to. Top end is one of the reasons I haven't jumped to a 197.
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Last edited by 92 190 PS; 08-18-2010 at 12:02 PM.
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  #6  
Old 08-18-2010, 11:58 AM
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eurosysytem0 eurosysytem0 is offline
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Quote:
Originally Posted by lettmeknow View Post
Last time I checked , an x7 is a ski boat !! Not a racing boat
Thanks for your useless contirbution. It really helps build "team relationships". Do you not have anything better to do.
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Old 08-18-2010, 12:00 PM
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now kids, play nice please!
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  #8  
Old 08-18-2010, 12:00 PM
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I'm pretty sure the 197/X7 should run 45 empty w/ a driver... 40 does seem low... a four blade prop is not going to help your top end. most of the time it cuts it down 1 or 2 mph.
is the bottom of the boat clean?
what is the altitude?
fresh fuel in the boat?
a perfect prop for one fellow may not be the the perfect one for another fellow.
PM Eric @ OJ and talk with him. He will work with you till you are happy and that is guarantied!
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Last edited by DooSPX; 08-18-2010 at 12:03 PM. Reason: saw Sodar posted speeds...
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  #9  
Old 08-18-2010, 12:01 PM
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eurosysytem0 eurosysytem0 is offline
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Thanks for your input
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  #10  
Old 08-18-2010, 12:02 PM
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eurosysytem0 eurosysytem0 is offline
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Many thanks for taking the trouble to input.
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