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View Full Version : 06 LSV Top Speed?



spyder
09-09-2009, 07:04 AM
I have a 06 LSV, I can get to about 36mph no problem, but past that feels like I am really pushing the boat...

about what RPM should I be at around 36 mph... and what should my top speed be?

i assume i have a standard prop (or standard wakeboard prop), but i did buy the boat second hand.

spyder
09-09-2009, 07:07 AM
by the way, I have the 325 engine.


I just wanted to make sure this is normal...

moombadaze
09-09-2009, 07:50 AM
look on the backside of the prop and you will/should see some numbers stamped in it-this will be the size your prop is.

Chad M
09-10-2009, 06:07 PM
I have an '07 LSV with the 325 and wakeboard prop. At wot (around 4800 by memory) I get around 37-39 mph depending on how many peeps and gas are on board as well as how the boat is trimmed with the wakeplate.

spyder
09-11-2009, 07:47 AM
thanks guys, that sounds about right with what I'm seeing

04OUTBACK
09-13-2009, 10:46 PM
normal
I have 14.25x14 OJ and 36-39 is tops..

jimmobius
09-17-2009, 12:35 PM
Moomba lsv 325hp , 13.5 x 16 acme , 40 maybe if I can keep the boat from porpoising too much. 13.7x 17.7 oj, better at low altitude with a light load about the same speed . rpm is 4800 maybe , again the boat porpoise's too much and with various wake plate positions and boat loading. Jim

cab13367
10-10-2009, 11:57 PM
spyder,

I have the same boat with the same engine as you and today, I got it up to 42 mph at 5000 rpm, full tank of gas, one adult and one kid on board, wakeplate about halfway down to keep it from porpoising. This was verified with a portable GPS unit I had with me. I have the stock OJ prop (13.7x17.5).

tprkolbas
10-13-2009, 11:13 PM
i have an 08 lsv with the wakeboard prop. i had empty tanks and the wake plate about 7/8 down on a glassy morning & my perfect pass said 40.2 mph. i typically only hit 39 at best - i must have had ideal conditions.

cab13367
10-13-2009, 11:32 PM
Glad to hear it since I am thinking about upgrading to a wakeboard prop. Is your PP calibrated?

tprkolbas
10-14-2009, 08:35 AM
i'm assuming it is calibrated. i had it installed at the factory when i ordered the boat. it matches up pretty close to the dial speedometer.

cab13367
10-14-2009, 09:37 AM
Not necessarily. Both speedometers could be off. Suggest u calibrate both with a portable gps. It's a pretty simple procedure.

Mikey
10-14-2009, 09:12 PM
The PP should be calibrated everytime the power,ie battery is disconnected,and checked periodically anyways and the boat speedos even more often as something as simple as a knee bumping the adjustment knob can alter the speedo readings.Usually once you set them up hopefully using a GPS to calibrate with they are good to go.
This summer at the World Waterski championships,I noticed they check/calibrate the boat in use Everytime before a new event starts and if anything outside of regular pulls occurs during Any event,ie use the boat as an Ambulance of sorts to transport an injured skier/jumper etc.These boats were using Zero off which is GPS but just the same when the potential for a World Record is there the boats MUST be dialed in exactly so they do it quite often.
Extreme yes but in the real world it doesn;t hurt to check oncein awhile or like mentioned at initial season startup.

brenpire
10-19-2009, 09:17 PM
I was able to hit 40mph @4900 RPM on the weekend. Plate in the middle. I don't think I can do that in the middle of summer. Could have to do with the air and water temp. My thinking is that water is more dense at 50 degrees vs. 75 degrees. Less drag?

I swear that when the boat was new I could do 45 or so.

yearround
10-19-2009, 11:37 PM
doesn't water get less dense when it cools? isn't that why ice floats? i have never been able to hit 40. will check out the sppeds etc next month when it starts to get cooler and we just ride around a little more.

smokedog2
10-22-2009, 09:59 PM
I think PP or a tight cable can cut one or two MPH. WOT was less than 4500 rpm.

It worked out over time

DOCDRS
10-29-2009, 12:41 AM
Year, i believe water and gas get more dense at the temp decreases.....is solid vs gas so your boat will always go faster when its cold......ie cold gas and cold water both perform better. hence why vapour lock and poor performance

the prop digs in better when the water is more dense, less microcavitation

smokedog2
10-31-2009, 04:25 PM
More likely you are hauling fewer people and less junk. The winter gas formulation is also probably a little better.

Water density is NOT going to make a difference between 80 and 35 F. The density range change at "almost ice" is zip.

http://hypertextbook.com/facts/2007/AllenMa.shtml

(.005 g/cm3) -- > about a pound in 1000 cubic meters

DOCDRS
10-31-2009, 10:00 PM
More likely you are hauling fewer people and less junk. The winter gas formulation is also probably a little better.

Water density is NOT going to make a difference between 80 and 35 F. The density range change at "almost ice" is zip.

http://hypertextbook.com/facts/2007/AllenMa.shtml

(.005 g/cm3) -- > about a pound in 1000 cubic meters

the number don't lie, maybe ist the gas density, i read a post on it somewhere that cooler gas is more effiecient, although my rpms don't change so thats why i thought maybe water..........it is an interesting perception tho....thanks for the numbers dog

mmandley
11-01-2009, 09:50 AM
What can be happening is colder air temps outside. Colder air is much more dense and also will create more pressure in the combustion chambers of the engine. This then creates more horsepower.

This is what an intercoller does for a turbo or a super charged engine. It cools the incoming air to make it more dense and create better horsepower.

Torque = acceleration

Horsepower is Top End and

Hotter days you have less horsepower output and lower top ends.

Colder days you have a little more horsepower and better top ends.

Not saying its a lot of ponies but a few can push you over the top.

In my LSV what i noticed it water quality greatly effects my top end. When the wind is blowing even a little, just enough to ripple the glass my top end can be around 34 ish.

When the wind is not blowing and its all glass i can hit 38ish. Water conditions and wind will play a part in it too. As well as wind drag from things on your tower like boards and such.