92 model XP 200, WOT @ 5000 to 5200rpm

[Sivart]

I have a 91 ASTRO 19.5 ft with a 92 XP 200. My max speed is around 55mph at around 5000 to 5200rpm. I can get the rpm's up higher but I do not get any increase in speed. The prop is a <br />14-3/4 x 21 p Viper. When I purchesed the boat I was very concerned with overheating so I dropped the motor all the way down (no jackplate) and replaced the water pump as well as installed a water pressure gauge.I have been raising it up a notch every so often trying to get the rpm and the speed up. During the test drive before purchasing with 2 people in the boat I got it up to 64 or 65 mph. Since then I have added my gear. My question is shouldnt I be able to achieve 60mph fairly easy? My next step is to raise the motor another notch higher.

 

[Dhadley]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

Has the boat responded to raising the motor? Sounds like it responded (negatively) when you dropped it.<br /><br />Whats your baseline water pressure now?

 

[LubeDude]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

I was probably set up correctly when you bought it. [Looking at the RPMs you are running], When you get back to where it was when you started, you should be OK!

 

[Sivart]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

Maybe some slight changes for the better. I gained about 200 rpms with every notch higher I go.<br />I have never got an "actual pressure reading because my pressure line is tied into the control valve line. (only place I could get it to work off of) but I do have a pressure to go from. at idle it stays about 10 psi, mid throttle it drops a bit (I suspect the from the water diverted by the control valve) and at WOT I have about 25 psi.<br />My real concern was the rooster tail when trimmed up for max speed. When I am really in the trim I have a pretty good rooster tail and I dont normally see them on Evinrude's. When it does this I trim it down a bump or 2 and the speed increases about 2 mph. I really noticed the speed loss when my dad blew by me in a 18.5 foot Skeeter with a 150hp Yammy. I would hope the 200XP could do better.

 

[Dhadley]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

What has the fact that its an Evinrude got to do with a rooster tail????<br /><br />Pleanty of other brands have seen my E-rude rooster tail.<br /><br />Anyway you rpm gains sound good. Kinda what we'd expect. Ditto on the bump down deal.<br /><br />Go west -- I mean up -- young man!

 

[Sivart]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

No offense but on most of the boats I have seen the Mercs have the big roosters. I always thought it was the design of the motor. Based off of your experience what kind of mph should I expect with my set up?<br />I will raise motor. I have 2 inches I could go up but the cavitation plate will be higher than the bottom of the motor any higher I go.<br />Thanks for the help.

 

[red10]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

the mercs that i've driven have a seperate tilt switch so you can really tilt the motor for a good rooster but you'll end up ruining the engine

 

[Dhadley]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

No offense taken at all! You go by one of those Mercs with a JohnRude and it usually leaves them real puzzled.<br /><br />Lets see, if we can swing that 21 at 6000 that will put the theoritical speed at about 66 mph. So if we get to 10% slip you'll be right at 60.<br /><br />Thats a pad bottom hull, right?

 

[Sivart]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

Sorry, I dont really know what "pad bottom" means but I know that there is about a 4 to a 6 inch step at the back. So the transom goes down flat then steps back 4 to 6 inches towards the front.

 

[LubeDude]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

Rooster tails are for show offs like me, It goes faster with a lower tail generaly.

 

[wrestler20]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

hey sivart,<br />Don't know if this will be any help or not, but figured i'd say something. I know you bought your rig in the early spring and it is almost the exact same as what i run. I probably lose about 400 rpm and about 5 to 7 mph from 61-62 down to 55-56 from early spring to summer just because of the humidity and temperature change. Sorry this isn't the best news, maybe someone on here can explain a way to both of us not to drop off that much. I end up changing my prop to run in the summer heat as compared to the springtime to stay running about the same rpm's. good luck,<br />Steve

 

[Sivart]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

I have lost around that much speed come to think of it. I am going to raise the motor up another notch but I am not that confident that raising it is going to get me back where I was in the spring. That may have something to do with it.<br />Thanks for the info. By the way do you have a jack plate on yours? I am wondering if that would help me out any?

 

[wrestler20]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

I have a hydrualic jack on mine, but dont use it much, more when i am going through shallow water than for anything else. Seems like i use it more to just set it and forget it. Have you tried any other props? I have really wanted to try a four blade trophy, but haven't found one for a decent price. Right now i run a 23 tempest plus in spring and fall and a 20 raker for ski/tubing in the summer. I have experimented with a 21 sst, 24 raker, but seem to like the tempest plus for overall speed best. Only thing i would change would be to possibly go to a 21 tempest plus instead of the 23 and get the rpms up a little more.<br />One other question, Where exactly is your H20 Pressure guage hooked in? I have never even come close to those pressures no matter what height i have my motor at. maybe i have it plugged in wrong (again) You said control valve line and i'm not sure where you mean exactly. Thanks for any info,<br />Steve

 

[wrestler20]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

 

[Sivart]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

The line that goes from the head side of the motor to the water control valve. Control valve is on the linkage side and actually hooks to the linkage. My gauge is hooked to the line that feeds the valve. I actually broke it while kooking up the pressure gauge. Thats how I know the name. For $60.00 bucks I should know the name.<br />I have not tried any other props. The only one I have access too is a 14.5x27 pitch Ballistic and I really dont think I would be able to turn that without getting a pull start from another boat.<br />How much of a setback does your jack plate have?

 

[wrestler20]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

I'll have to look for the line you're talking about because i have been only reading about 14# WOT all along. We changed the impeller when i purchased the motor, so i am fairly certain that isn't the problem.<br />The jackplate has 10 inches of setback. It was on the boat when i got it, so i have nothing to compare before and after stats to. Doesn't sound like its helping me too much here though if you have a 19 footer running 65 with no jackplate and my 20 footer is running 62. Is that gps speed or speedo?<br />Steve

 

[Sivart]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

It is actually 19.5 foot on the title. Like you said back in the Spring I did in fact get it up too 65 but it has not been there for a while. I calibrated my wheel type speedo off of my uncles GPS. Dont really know how accurate it is but next to my dads Skeeter they are within 1 to 2 mph of each other until he decides to hammer it and suck the paint off my boat.<br />I have been struggling here lately to get 60mph and at that I need a lot of room, thats the reason why I will be raising the motor another inch this weekend.I still have 2 inches to go up before I get it back to where it was when I bought it. I guess I should have left well enough alone. Dhadley did warn me but it was after the fact when I read his post.<br />By the way, Thanks for all the info.

 

[wrestler20]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

The speedo should be pretty accurate if you calibrated it. Seems like they stay pretty accurate after that first calibration. <br />As far as messing with the setup to go faster, that's just human nature. Wouldn't feel right if you didn't try to get a little more out of it. Sucks when you pay money and then it ends up slowing you down though. I've done that with a few different props.<br />Wouldn't be too concerned about your dad's skeeter though, that's probably just a faster boat from the start, but i bet he paid a bit more for it And if it's a skeeter bassboat, just think how retarded it would look with about 6 people, coolers, and water toys hanging all over it. Besides, I like the solid ride of the astro when i get into some chop, for me it's just the happy medium between big heavy bowrider comfort,bassboat speed, and deep v fishability. I'll have to look for that tube to run my water pressure on, so if i can't find it i may be bugging you for a little more info<br />Steve

 

[Sivart]

Re: 92 model XP 200, WOT @ 5000 to 5200rpm

Not a problem. I Hooked it up where it is now after going to a local dealer and seeing the exact hookup on another 200 XP. The only thing I hate about it is that the pressure varies at different throttle positions. It is actually lower at mid throttle than it is at idle. It picks up at about 3/4 to full throttle. I was told by the dealer that it is just the cntrol valve diverting water different directions depending on the amount of throttle given.<br />No doubt about the Skeeter. He has clocked it off a GPS at 72 mph with only a 150 hp. That thing will fly. Amazing enough I do hang with him till about 50 mph then after that its all over.<br />Your right about the ride. My Astro handles chop great.