OJ 475 on a 21LSV diamond cut

[chadwick02]

Hey everyone,

Im thinking about re-proping.

Here is my scenario: 50% of my time is spent skiing. The other 50% is spent surfing, boarding, and tubing while HEAVILY LOADED. The boat does great with no weight, and it does alright with lots of weight in it, but I know it is really struggling and I am beating the tar out of the motor. Looking to make it a little easier to get out on plane while loaded and hold speed, but not looking to be spinning tons more RPM's while skiing.

In doing lots of research and talking to many folks, the OJ 475 comes up alot. However, everything I have seen has been tested on a wake hull, not a diamond cut hull. Is anyone running a 475 on a diamond cut hull? Ive got the stock prop (381). Its 13.5x17.5

Also - the guy at "the prop shop" mentioned in the group buy article said there was no way i could try a prop and send it back or exchange it for a different one. Does this sound right? I seem to remember folks switching props and trying different ones.

Thanks,

Chad

[WakeGirl]

Oh my, the 475 would be a monster upgrade over the 381, regardless of the hull. I had no idea that was the prop that you're running.

[mrothwell]

Oh my, the 475 would be a monster upgrade over the 381, regardless of the hull. I had no idea that was the prop that you're running.

Do you have the RPM's at 34 mph???

I've got the 1235 prop on my VTX (diamond), and I'm turning 4100 RPM at 34 mph. That's too high for my tastes.

But, man does it jump out of the water when you hit the throttle.

I'm thinking that the 506 might be the better bet.

Edited July 9, 2007 by mrothwell

[D-GOOSE]

Hey everyone,

Im thinking about re-proping.

Here is my scenario: 50% of my time is spent skiing. The other 50% is spent surfing, boarding, and tubing while HEAVILY LOADED. The boat does great with no weight, and it does alright with lots of weight in it, but I know it is really struggling and I am beating the tar out of the motor. Looking to make it a little easier to get out on plane while loaded and hold speed, but not looking to be spinning tons more RPM's while skiing.

In doing lots of research and talking to many folks, the OJ 475 comes up alot. However, everything I have seen has been tested on a wake hull, not a diamond cut hull. Is anyone running a 475 on a diamond cut hull? Ive got the stock prop (381). Its 13.5x17.5

Also - the guy at "the prop shop" mentioned in the group buy article said there was no way i could try a prop and send it back or exchange it for a different one. Does this sound right? I seem to remember folks switching props and trying different ones.

Thanks,

Chad

Ok I can fill you in on allot of this. The try it before you buy it deal can only happen with OJ props (FWIK) and at that you need a vendor willing to do this if your looking to save $$$$. I was able to pull this off (discount and trying it) for the group buy.

Changing over to the 475 would not be the best move for the diamond hall, 320hp and a 21' bu IMO. If your looking for a little better hole shot, a all around great prop for wakeboarding/skiing and not loosing much on top end, I would look at the ACME 537 (woody has one for sale) The 537 prop was great for many of us until we started to load the wake-setters down.

The 506 is a good prop but I still need to hear of how people like it that are running them, but once again IMO

this would NOT give you what your looking for in the end.

[chadwick02]

Oh my, the 475 would be a monster upgrade over the 381, regardless of the hull. I had no idea that was the prop that you're running.

Do you have the RPM's at 34 mph???

running about 3500RPM at 34mph with 2 people in the boat

[mrothwell]

Oh my, the 475 would be a monster upgrade over the 381, regardless of the hull. I had no idea that was the prop that you're running.

Do you have the RPM's at 34 mph???

running about 3500RPM at 34mph with 2 people in the boat

That's with the 475? If so, that sounds like what I want.

Right now, I hit the rev limiter easily at around 43 mph (not verified with GPS). I'm not a high speed cruiser, so don't care too much about top end, I just hate running >4K at ski speeds.

[chadwick02]

Oh my, the 475 would be a monster upgrade over the 381, regardless of the hull. I had no idea that was the prop that you're running.

Do you have the RPM's at 34 mph???

running about 3500RPM at 34mph with 2 people in the boat

That's with the 475? If so, that sounds like what I want.

Right now, I hit the rev limiter easily at around 43 mph (not verified with GPS). I'm not a high speed cruiser, so don't care too much about top end, I just hate running >4K at ski speeds.

No, thats 34MPH@3500 RPM's on the stock 381. I dont do much high speed crusing, so i dont care about loosing a few MPH off the top end, but do spend alot of time skiing, so I dont want to be guzzeling gas like no tomorrow.

I was pretty much set on the 475, but after reading what people have to say it seems as though it might not be ideal?

I read that people with wake boats only lost a mile an hour or so off their top end (475). Do you guys think that will be true on a diamond cut hull too?

Edited July 10, 2007 by chadwick02

[Willy]

Oh my, the 475 would be a monster upgrade over the 381, regardless of the hull. I had no idea that was the prop that you're running.

Do you have the RPM's at 34 mph???

I've got the 1235 prop on my VTX (diamond), and I'm turning 4100 RPM at 34 mph. That's too high for my tastes.

But, man does it jump out of the water when you hit the throttle.

I'm thinking that the 506 might be the better bet.

I just tried the 475 on my 20 vtx (diamond) this last weekend and I am getting 42mph (GPS) no rev limiter WFO. I used to get 43 and some change with the stock prop so basically no loss on the top. The big difference is on the low end. We had 9 people MLS full, Right rear full, and power wedge set at the "largest wake" setting and we were surfing at 10-11mph and it seemed to have a lot less strain on the motor than it did with 4-5 people with the old prop. My vote is for the 475 if you do any cross over. I have read to many stories of guys hitting the rev limiter with the 1235. ( that would be great if you only did board sports!). OJ Group Buy rocks!!

[chadwick02]

Oh my, the 475 would be a monster upgrade over the 381, regardless of the hull. I had no idea that was the prop that you're running.

Do you have the RPM's at 34 mph???

I've got the 1235 prop on my VTX (diamond), and I'm turning 4100 RPM at 34 mph. That's too high for my tastes.

But, man does it jump out of the water when you hit the throttle.

I'm thinking that the 506 might be the better bet.

I just tried the 475 on my 20 vtx (diamond) this last weekend and I am getting 42mph (GPS) no rev limiter WFO. I used to get 43 and some change with the stock prop so basically no loss on the top. The big difference is on the low end. We had 9 people MLS full, Right rear full, and power wedge set at the "largest wake" setting and we were surfing at 10-11mph and it seemed to have a lot less strain on the motor than it did with 4-5 people with the old prop. My vote is for the 475 if you do any cross over. I have read to many stories of guys hitting the rev limiter with the 1235. ( that would be great if you only did board sports!). OJ Group Buy rocks!!

Hold up - few questions.

1) I have never actually hit the rev limiter on my boat. Im not qute sure where "red line" is, so I've never pushed it past about 4800 RPMs. At what point will the rev limiter kick in on a 02 monsoon?

2) Willy - were you getting 42MPH (475) with the boat loaded with 9 people on board, or pretty much empty at WOT?

3) Can you give a rough estimate of what your RPMs were at slalom speeds (anywhere between 32 and 36mph)

4) did you notice any change in wake shape (i heard the 475 might increase the size of the rooster tail) at slalom speeds?

Thanks!!

Chad

[WakeGirl]

I'd be very surprised if you said that you had hit the limiter with the 381. I have that prop & can't hit it with my 383 Stroker. Goose is probably right, the 537 would probably be the best compromise for giving you what you want. The 475 would give you a better hole shot over the 537, but not by a lot & it would add significant rpms at skiing speeds. If I were you, that's what I'd go with.

[mrothwell]

Oh my, the 475 would be a monster upgrade over the 381, regardless of the hull. I had no idea that was the prop that you're running.

Do you have the RPM's at 34 mph???

I've got the 1235 prop on my VTX (diamond), and I'm turning 4100 RPM at 34 mph. That's too high for my tastes.

But, man does it jump out of the water when you hit the throttle.

I'm thinking that the 506 might be the better bet.

I just tried the 475 on my 20 vtx (diamond) this last weekend and I am getting 42mph (GPS) no rev limiter WFO. I used to get 43 and some change with the stock prop so basically no loss on the top. The big difference is on the low end. We had 9 people MLS full, Right rear full, and power wedge set at the "largest wake" setting and we were surfing at 10-11mph and it seemed to have a lot less strain on the motor than it did with 4-5 people with the old prop. My vote is for the 475 if you do any cross over. I have read to many stories of guys hitting the rev limiter with the 1235. ( that would be great if you only did board sports!). OJ Group Buy rocks!!

Hold up - few questions.

1) I have never actually hit the rev limiter on my boat. Im not qute sure where "red line" is, so I've never pushed it past about 4800 RPMs. At what point will the rev limiter kick in on a 02 monsoon?

2) Willy - were you getting 42MPH (475) with the boat loaded with 9 people on board, or pretty much empty at WOT?

3) Can you give a rough estimate of what your RPMs were at slalom speeds (anywhere between 32 and 36mph)

4) did you notice any change in wake shape (i heard the 475 might increase the size of the rooster tail) at slalom speeds?

Thanks!!

Chad

I believe it was Edwin that liked the wake that the OJ threw better than the ACME after doing a bunch of testing.

I have no brand allegiance, I want the softest wake with "decent" hole shot and reasonable RPM's at slalom speeds.

The best slalom wake wins over anything else for me.

Eric suggested the 506 to me, but I would love to try one and see how the wake compares to the 1235 or the 537.

Anyone want to send me a 475, 506, and 537? I'd more than happy to compare back to back to back to back.

[anthony lee]

Oh my, the 475 would be a monster upgrade over the 381, regardless of the hull. I had no idea that was the prop that you're running.

Do you have the RPM's at 34 mph???

I've got the 1235 prop on my VTX (diamond), and I'm turning 4100 RPM at 34 mph. That's too high for my tastes.

But, man does it jump out of the water when you hit the throttle.

I'm thinking that the 506 might be the better bet.

I just tried the 475 on my 20 vtx (diamond) this last weekend and I am getting 42mph (GPS) no rev limiter WFO. I used to get 43 and some change with the stock prop so basically no loss on the top. The big difference is on the low end. We had 9 people MLS full, Right rear full, and power wedge set at the "largest wake" setting and we were surfing at 10-11mph and it seemed to have a lot less strain on the motor than it did with 4-5 people with the old prop. My vote is for the 475 if you do any cross over. I have read to many stories of guys hitting the rev limiter with the 1235. ( that would be great if you only did board sports!). OJ Group Buy rocks!!

Hold up - few questions.

1) I have never actually hit the rev limiter on my boat. Im not qute sure where "red line" is, so I've never pushed it past about 4800 RPMs. At what point will the rev limiter kick in on a 02 monsoon?

2) Willy - were you getting 42MPH (475) with the boat loaded with 9 people on board, or pretty much empty at WOT?

3) Can you give a rough estimate of what your RPMs were at slalom speeds (anywhere between 32 and 36mph)

4) did you notice any change in wake shape (i heard the 475 might increase the size of the rooster tail) at slalom speeds?

Thanks!!

Chad

I believe it was Edwin that liked the wake that the OJ threw better than the ACME after doing a bunch of testing.

I have no brand allegiance, I want the softest wake with "decent" hole shot and reasonable RPM's at slalom speeds.

The best slalom wake wins over anything else for me.

Eric suggested the 506 to me, but I would love to try one and see how the wake compares to the 1235 or the 537.

Anyone want to send me a 475, 506, and 537? I'd more than happy to compare back to back to back to back.

interesting reading Anthony here from leeton nsw Australia my prop is oj 14 x18 left hand on 325 hp indmar sunsetter

at 2300 RPM 18MPH at 4100 to 4200 RPM 41 MPH at 5000 47.5 MPH GPS done on top speed my boat is a 2001 fuel economy is around 14 litres per hour doing a bit of footing slalom and occassional wake board but someone mentioned wake differences it would be good to be able to enter our details of prop hull engine with pictures at appropiate speeds of wake on flat water. The prop I have is good for what I do but if I could find better I would .

[chadwick02]

Willy - any idea of what your RPMs were at slalom speeds (anywhere between 32 and 36mph) on the 475??

[D-GOOSE]

I believe it was Edwin that liked the wake that the OJ threw better than the ACME after doing a bunch of testing.

His testing was done with a DD boat and not going to give you the same affects. The one thing I have found out is wake shape, prop wash and performance change from boat to boat, with the same prop.

One of the hardest things to do is to find a prop to give you the tournament style ski wale and then turn around to have that same prop perform to the high standards of a huge wakeboarding wake. At some point you will have to give on one side or the other. Sorry maybe some day they will come out with a prop that you can change the pitch with a flick of a switch.

[srab]

I'd be very surprised if you said that you had hit the limiter with the 381. I have that prop & can't hit it with my 383 Stroker. Goose is probably right, the 537 would probably be the best compromise for giving you what you want. The 475 would give you a better hole shot over the 537, but not by a lot & it would add significant rpms at skiing speeds. If I were you, that's what I'd go with.

Chad,

FWIW, and I know that we have different boats (mine is the '06 21 LSV with diamond):

I bought the ACME 537 during the group buy. With just me in the boat, here is how it compares

to the stock 381:

--------537--------------------------------------------------381-------

rpm-----------mph----------------------------------rpm--------------mph

3000-----------26-----------------------------------3000-------------28.5

4000-----------33.5---------------------------------4000-------------38

4500-----------38-----------------------------------4500-------------42

4900-----------41.5---------------------------------3500-------------33

The 537 does give it a more impressive hole shot. As above, though, my boat tachs 5K more at slalom

speeds with the 537 vs. the 381. YMMV.

[mrothwell]

I believe it was Edwin that liked the wake that the OJ threw better than the ACME after doing a bunch of testing.

His testing was done with a DD boat and not going to give you the same affects. The one thing I have found out is wake shape, prop wash and performance change from boat to boat, with the same prop.

One of the hardest things to do is to find a prop to give you the tournament style ski wale and then turn around to have that same prop perform to the high standards of a huge wakeboarding wake. At some point you will have to give on one side or the other. Sorry maybe some day they will come out with a prop that you can change the pitch with a flick of a switch.

That decision has already been made. I def want the ski wake, as that is the most important discipline to me.

[vette-ski]

I'd be very surprised if you said that you had hit the limiter with the 381. I have that prop & can't hit it with my 383 Stroker. Goose is probably right, the 537 would probably be the best compromise for giving you what you want. The 475 would give you a better hole shot over the 537, but not by a lot & it would add significant rpms at skiing speeds. If I were you, that's what I'd go with.

Chad,

FWIW, and I know that we have different boats (mine is the '06 21 LSV with diamond):

I bought the ACME 537 during the group buy. With just me in the boat, here is how it compares

to the stock 381:

--------537--------------------------------------------------381-------

rpm-----------mph----------------------------------rpm--------------mph

3000-----------26-----------------------------------3000-------------28.5

4000-----------33.5---------------------------------4000-------------38

4500-----------38-----------------------------------4500-------------42

4900-----------41.5---------------------------------3500-------------33

The 537 does give it a more impressive hole shot. As above, though, my boat tachs 5K more at slalom

speeds with the 537 vs. the 381. YMMV.

Good info. I assume you mean it tachs 500 rpm more at ski speeds? (not 5k more).

Also, do you have WOT rpms and peak speed? I would imagine peak rpms will be higher for the 537 than the 381.

[Eric Johnson]

Chadwick - l'd be happy to send you any size props you'd like to try. Just give me a call to set it up.

Eric @ OJPROPS - 800-359-9730

[srab]

Good info. I assume you mean it tachs 500 rpm more at ski speeds? (not 5k more).

Also, do you have WOT rpms and peak speed? I would imagine peak rpms will be higher for the 537 than the 381.

Er ... uh ... right! 500 rpm more. I guess that I should also add that this is with the 320 LCR

engine, which I think is pretty close, if not identical, to the older Monsoon. IIRC, the '05 and newer

21 LSVs are 600 lbs. heavier and, of course, on a different hull, so this is not really an "apples to

apples" thing.

With the 537, that 41.5 mph@4900 rpm is pretty much WOT. I've never pushed with the 381 any

farther than 42 mph, but I've not been left with the impression that there's much more there. I'll

have to check again if I can get smooth water this weekend.

[vette-ski]

Er ... uh ... right! 500 rpm more. I guess that I should also add that this is with the 320 LCR

engine, which I think is pretty close, if not identical, to the older Monsoon. IIRC, the '05 and newer

21 LSVs are 600 lbs. heavier and, of course, on a different hull, so this is not really an "apples to

apples" thing.

With the 537, that 41.5 mph@4900 rpm is pretty much WOT. I've never pushed with the 381 any

farther than 42 mph, but I've not been left with the impression that there's much more there. I'll

have to check again if I can get smooth water this weekend.

Are there different diamonds. I thought you said yours was. So is mine. I get 44 mph out of my 381.

[srab]

Are there different diamonds. I thought you said yours was. So is mine. I get 44 mph out of my 381.

SV23, V25, V27, and now the cut diamond.

My boat is the 2006, on the V25 diamond, weighing in at 3500 lbs. [with a 21.5 foot length,

a 98 in. beam, and a 24 in. draft]. It has a 46 gallon gas tank and was close to full when I did

my prop comparison.

If yours is the 2001 Sunsetter VLX, it's on the SV23 diamond, weighing in at 2900 lbs. [with

a 21 foot length, a 93 in. beam, an 18 in. draft], and a 35 gallon gas tank. And, BTW, it's

probably a significantly better ski boat.

So, we're not really comparing apples to apples here.

Also, assuming comparable engines, these speedometers are notoriously inaccurate to a certain

degree, and my speeds were not verified by GPS. A 3 mph difference, given all of the above, is not

at all surprising to me.

[WakeGirl]

Depending on the boat & engine (& elevation of course), the 381 is well matched under optimal conditions (empty boat, calm conditions). With my VLX & 383 combo, I can get 47 mph with the 381 (probably more at lower elevations, that's at 3k feet of altitude). With the 537 I can only get about 43 (sometimes 44 if I drive it just right, feathering it off of the rev limiter), & that's slamming the rev limiter. All of that is GPS measured, I don't trust the speedo above about 35mph. It says 53 when the GPS says 46-7. But the 381 just sucks when you load the boat down, the 537 is a better match if you're running ballast &/or just want a good hole shot.

[bu2007vlx]

Keep us informed on which one you decide. My main discipline is slalom skiing also and am interested what you decided after you tried them out. I have an 07 vlx with the diamond hull. Slalom wake first, holeshot second, wakeboarding wake third and top end last. Thanks for the post!

Edited July 11, 2007 by bu2007vlx

[anthony lee]

Keep us informed on which one you decide. My main discipline is slalom skiing also and am interested what you decided after you tried them out. I have an 07 vlx with the diamond hull. Slalom wake first, holeshot second, wakeboarding wake third and top end last. Thanks for the post!

Anthony here the read was good I'm lucky to be 1500 ft above sea level my main disiplines are slalom and barefoot and fuel economy my oj 14 x18 is perhaps as high as I can go would my top speed of 47.5 MPH be the terminal speed for a 21.6 ft vlx sunsetter or do they go any better if so there would be no point doing anything else and would shapeing the front

fin to the gorilla type improve my hulls performance the newer boats in oz have the curved fins.

[chadwick02]

I just talked to Eric at OJ. What a great guy!! He is shipping me (2nd day so I can have it by this weekend) both a 475 (14.5x14.25) and a 506 (14.25x14.75). The 506 was the highest pitch he said they made. I am still concerned that it might be too low. In response to my concern Kevin said “You need to be more concerned about having Randy Moss on you’re team (Jab at the NE patriots) then loosing top end with these props". What a funny guy. We’ll see if he’s gona eat his words or not…

Bought the prop puller kit too. Sounds like they have a pretty good arrangement with Kevin’s prop shop too – demo them through OJ, keep the one you want, and Kevin’s prop shop will bill you for it since they are a retail merchant.

I’m gona try to make the testing as “scientific” as I can so I can report some solid numbers to everyone that is wondering how these do on a diamond cut hull. I’ll let ya’ll know what I find.

Thanks again for everyone’s insight!!!

Chad

Edited July 11, 2007 by chadwick02