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pedel
05-17-2018, 06:10 PM
For those of you enjoying your new SL's (like I am!), I'm curious what engine/prop set up you have and what you're seeing in terms of RPMs and GPH while surfing. Here's my info:

- SL450
- Sea level
- Full Stock + 800lbs lead + 2-4 people in the boat
- Prop: Acme 2973 15x11 altitude prop
- Surfing 10.8 - 11.2 MPH
- RPMs 3800-3900 @ 11.2 MPH
- GPH: I just started tracking but my last tank was 6.3GPH

Even though the GPH isn't bad, I'd sure love to cut some RPM's and noise down. I'm thinking that since I'm at sea level my prop is a bit aggressive, but look forward to what others are seeing and your thoughts.

Thanks!

Ryann
06-05-2018, 11:03 PM
I'll post back when I take delivery and get it broken in. It may be a couple months though before I get solid data. I hope it's more like 3200 rpm. My axis would surf around 3000 rpm. Might be a good time for you to buy a prop and keep the 2973 as

SL 400
Acme 2775 15 x 12.5 (pro orders all them with this prop)
I own 400 lbs of lead. I'm going to see how it does without any at all.

elevatedconcept
06-06-2018, 01:15 AM
We are doing some testing on an SL450 at the shop with a 16/12.5... should be in the water tomorrow. Ill report back what the performance is around sea level.

Ryann
06-06-2018, 07:22 AM
We are doing some testing on an SL450 at the shop with a 16/12.5... should be in the water tomorrow. Ill report back what the performance is around sea level.

Very interested. Please report back. Do you have any idea how big a prop you can go without having clearance issues?

shockthis
06-06-2018, 10:07 AM
We are doing some testing on an SL450 at the shop with a 16/12.5... should be in the water tomorrow. Ill report back what the performance is around sea level.

Elevated Would be very interested in your thoughts of surf set ups on this boat, I have seen the pictures of what you do with the RZX wave.

Ryann
06-12-2018, 01:15 PM
Any news on the 16 x 12.5?

Charlie99
07-11-2018, 05:32 PM
Any new updates guys?

shockthis
07-12-2018, 01:49 AM
I run about 3200-3400 rpm , not sure about the Gph

Ryann
07-12-2018, 08:12 AM
Acme 2775: 3200 rpm 11.0 mph surfing with ballast. In my opinion, it's the perfect prop.

My gut says I would not go with a bigger diameter for prop clearance reasons. It looks tight as is.

pedel
07-12-2018, 12:37 PM
Good timing on this question, because I just swapped props last night. I previously had the Acme 2973 15x11. I run with an extra 900lbs of lead and usually just a couple of people in the boat. I've been consistently running at 3900 RPM's. My dealer talked to SC, and they suggested I go with the stock prop Acme 1235 14.5x14.25. I just surfed it this morning and was averaging about 3600-3700 RPMs. I was kind of surprised they suggested this vs. the 2775 but figured I'd give it a try. But I have to give a huge shout out to my dealer who is swapping props out for me at no cost...it's a new boat and he's been super cool working together to figure out the best set up without having to roll the dice on buying new props!

Gearhead
07-12-2018, 02:22 PM
I’m running 2775. Full ballast 600 in lead. 11.6 mph I’m seein. 3800 rpm. 12mph close to 4K rpm. Would love to drop to around 3500-3600

pedel
07-12-2018, 06:48 PM
So, another update. My kid went out today with 5 people and said that with the new Acme 1235 he couldn't get up to speed beyond 10MPH. So, it looks like if you're adding lead (we have 900lbs) I'd stay away from that. I'm going to to try the 2775 next. addd

Gearhead - how many people where int the boat when you saw those numbers?

Ryann
07-12-2018, 07:55 PM
SL 400: 400 lead. 2 people in cabin. 11.0 mph. 3200 rpm. Acme 2775

One tip my salesman gave me was to adjust the Speed at which the surf plates deploy in relation to set speed. There’s a few settings you can play with on the auto launch page. I’m a bit foggy on the terminology. May help...

Gearhead
07-12-2018, 08:26 PM
3 kids 3 adults 1 surfer. I’m not sure how you are running only 3200 at 11mph with a 2775. I am never under 3600 rpm.

jjalehman
07-12-2018, 09:22 PM
Our SL had the 2775 on it from the dealer. My RPMs are right where all of yours are with the 2775. I kept the 1235 as a spare from our previous boat (Malibu 23 LSV). You were right about the 1235, the SL does not seem to care for it much. I called ACME and they thought the 2 best props for the SL would be the 2775 or the 2773. The 2773 would give you the lower RPMs. Contacted OJ props also and they suggested the OJ 945 which from what I'm seeing has the same specs as the 2773. From what I'm seeing the OJ is a little more durable prop too.

Gearhead
07-12-2018, 09:48 PM
I am leaning towards that 2773 as well. If it drops rpm 300-500 and still hold rpm well it will be the winner.

Gearhead
07-23-2018, 04:22 PM
I just ordered the new OJ 950 prop. will report my findings

dakota4ce
07-23-2018, 04:55 PM
We never did hear from elevated on this matter—I don’t think the owner tested it. I will reach out, maybe I can get it into my boat to try. Would be very similar situation...


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Mgigs7
07-23-2018, 05:18 PM
If it helps-
I have the 2773 on a 16SG 550
No problem with taking off or getting on plane. Top speed it around 40 but that’s at high RPM’s. Surf is 3200-3400 depending on conditions.



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Gearhead
07-23-2018, 05:30 PM
the sl is heavier then the SG. But thats helps, I almost went with the 2773. Trying this new OJ design.

dakota4ce
07-23-2018, 05:32 PM
If it helps-
I have the 2773 on a 16SG 550
No problem with taking off or getting on plane. Top speed it around 40 but that’s at high RPM’s. Surf is 3200-3400 depending on conditions.



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You guys and your silly 575 motors don’t help us poor normally aspirated people


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dakota4ce
07-23-2018, 05:35 PM
Specs on the oj 950?


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Mgigs7
07-23-2018, 05:35 PM
the sl is heavier then the SG. But thats helps, I almost went with the 2773. Trying this new OJ design.

I do have 450lbs in lead and 1k bags on each side.


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Gearhead
07-23-2018, 05:54 PM
the new 950 replaces the 945. its a 15x13

dakota4ce
07-23-2018, 06:08 PM
the new 950 replaces the 945. its a 15x13

Got it. Must have tweaked the cupping some


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Gearhead
07-23-2018, 06:53 PM
I’m not sure. I just know it’s improved. There is also the 951

DatTexasBoy
07-23-2018, 07:41 PM
Im interested t hear back on this 16x12.5 prop!!!! Wheres the data???

dakota4ce
07-23-2018, 07:57 PM
No data yet! I’m trying to get my hands on it and run it on my 2016 SE 450 with a boatload of weight. I currently run at 2775. Same RPMs 3600-3800. For some reason it seems to push a little bit easier than an SL because I have more weight.


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Gearhead
07-23-2018, 07:59 PM
I think the se hull is more efficient. The sl is like a plow lol. I think that’s why. Although the new se will be more sl like

dakota4ce
07-23-2018, 08:02 PM
Very well could be, but it should be a fairly decent comparison test because I run that same speed at the same RPM with the same propeller/motor so we’ll see what it does on mine.


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dakota4ce
07-23-2018, 08:03 PM
And I am quite sure I can clear it. I know for sure you could clear it on an SL, there is like 1.75 inches of clearance if I am not mistaken.


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Gearhead
07-23-2018, 08:25 PM
Yes it will be a good comparison. I’ll report my findings. Be about 2 weeks before I get to boat again

monkey_butt
07-24-2018, 02:27 PM
I'm running the 2775 with the 400 and with the additional PNP (500) and the 250 (non PNP) in the front - 2 people in the boat plus 4 dogs - about 3400rpm.

Yesterday was kinda disappointing for whatever reason compared to Sunday. So we put the 540 bag I still have with me back into the center … and it was money … and oddly enough RPM stayed the same … will post pics after tonight for comparison purposes.

Gearhead
07-24-2018, 02:35 PM
what speed and pitch where you running?

monkey_butt
07-24-2018, 02:53 PM
11.2 and 8.0 - sorry that is obviously an important factor :rolleyes:

Gearhead
07-24-2018, 03:30 PM
yes that makes sense then.

I"m running pitch 10-11 speed 12. I"m 4k RPM

shockthis
07-24-2018, 05:34 PM
i noticed as soon as the pitch goes up over 9.5 the rpms really climb. I f you keep it around 8.5 - 9 then the rpms will stay lower even with extra weight. One day we put a 750 on the floor and 600lbs (300 each side in the coffin seats) and the rpms stayed around 3600.

dakota4ce
07-24-2018, 05:35 PM
i noticed as soon as the pitch goes up over 9.5 the rpms really climb. I f you keep it around 8.5 - 9 then the rpms will stay lower even with extra weight. One day we put a 750 on the floor and 600lbs (300 each side in the coffin seats) and the rpms stayed around 3600.

BUT....there are a few gurus suggesting higher is better for the wave. Wake 9 is influencing this a bit I suspect.


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Gearhead
07-24-2018, 05:53 PM
you get a taller wave with more pitch, for sure.. I will have to try a pitch of 9. althought I dont see how that will work with out using some smart plate or dropping rear ballast. the boat wants to sit at about 10 -10.5 on pitch

Broke Pilot
07-24-2018, 07:44 PM
We were playing with the wave on the SA the other day and were surprised that 10.5-11° pitch was working great. Anxious to get it on some smoother water and really play around with it.

Ryann
07-24-2018, 09:51 PM
I didn’t have any luck with 10 degrees pitch on my SL at 11-11.5 mph. I liked 8-9 pitch max, and about 3 degrees roll. Fantastic wave for me. Acme 2775 3400 rpm 11.2 mph 9 degrees pitch.

I also noticed that it’s really important to experiment with the wakeplate when playing with autowake. If I wasn’t careful, I would adjust the wakeplate and autowake would drain the bow to get the nose up. I would like to see autowake integrate the wakeplate. Max ballast for displacement, but use that wake plate to fine tune it. The wakeplate does a great job with pitch.

dakota4ce
07-24-2018, 10:22 PM
I didn’t have any luck with 10 degrees pitch on my SL at 11-11.5 mph. I liked 8-9 pitch max, and about 3 degrees roll. Fantastic wave for me. Acme 2775 3400 rpm 11.2 mph 9 degrees pitch.

I also noticed that it’s really important to experiment with the wakeplate when playing with autowake. If I wasn’t careful, I would adjust the wakeplate and autowake would drain the bow to get the nose up. I would like to see autowake integrate the wakeplate. Max ballast for displacement, but use that wake plate to fine tune it. The wakeplate does a great job with pitch.

I have always heard that wake plate over 30 starts to lift the tail and counteract your rear ballast. Always aim for 30 or less wakeplate.


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Gearhead
07-24-2018, 10:24 PM
Dakotas right you create lift in the rear.

Man wave is insane at pitch of 10.

monkey_butt
07-25-2018, 12:07 AM
Gotta try that - we always stay at 8 ... and we got pics but not with my phone so will post tomorrow

Gearhead
07-25-2018, 09:47 AM
I"m not sure how a pitch of 8 you not giving up some displacement. You have to be forcing the nose down some how??

Ryann
07-25-2018, 09:55 AM
My usual setting is 100% full ballast plus 400 lb lead in rear almost as far back as possible. 0 wake plate usually but we have adjusted it to a max of 50. I usually leave it at 20.

Gearhead
07-25-2018, 10:58 AM
Ryann,,, what pitch and rpm are you running?

Ryann
07-25-2018, 11:47 AM
Ryann,,, what pitch and rpm are you running?

3400 rpm. 8-9 pitch. awesome wave. see previous posts of mine

Gearhead
07-25-2018, 12:20 PM
Ah your only running 11 mph

dakota4ce
07-25-2018, 12:32 PM
I have been weighing this SL motor debate for a while now thinking this is my next boat. But now, I am really taking a hard look at the maKai and the 450/1.76 option.

If I can be satisfied with the fit and finish of that boat, it would be really hard to ignore the amount of value you get out of it.


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dakota4ce
07-25-2018, 12:32 PM
Don’t get me wrong though, I love me the SL. For that matter I really love my SE, I just want the next level and Autowake.


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Gearhead
07-25-2018, 01:18 PM
it is defiantly a value. and the 450 is a new motor. its not the 440

MJHSupra
07-25-2018, 02:02 PM
Should be interesting to see the new power curve numbers on the 450. It might be out there, but it will now be topic on here with the new release last week and the Supra release this week (if it happens).

Gearhead
07-25-2018, 05:02 PM
dakota if you can find a left over SL get it. So worth it. The new sl is even nicer, but quite a price jump. I love mine, hoping this new prop helps with rpm.

dakota4ce
07-25-2018, 05:13 PM
dakota if you can find a left over SL get it. So worth it. The new sl is even nicer, but quite a price jump. I love mine, hoping this new prop helps with rpm.

That’s all I need to know. Can a 450 push what I am going to want to push....I think there are quite a few 18 450s roaming around! And trust me, I [emoji7]em!


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Gearhead
07-25-2018, 05:24 PM
You might be surprised with the wave, it doesn't seem to need a lot of extra.. I have 600 in lead. I wont add anymore. Everyone who rode my wave has been floored.

dakota4ce
07-25-2018, 05:50 PM
I rode the first day on my buddy Scott’s SL with 1000# lead. It was indeed good, but surprisingly not better than my SE. Just the 2 of us.

BUT THEN: I rode the same boat last Sunday with 14 people on board, and HOLY BALLS. That was a game changer. Significantly better than my SE.


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Gearhead
07-25-2018, 06:00 PM
1000 in lead plus 14 peeps?!?!?

dakota4ce
07-25-2018, 06:03 PM
1000 in lead plus 14 peeps?!?!?

You got it. Lots of children, so I estimated the total weight to be somewhere in the neighborhood of 1200 pounds of humans. Obviously the boat has a supercharger. It had zero issue pushing that weight around of course. But I want to know if I could do that with a 440.


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dakota4ce
07-25-2018, 06:05 PM
You should’ve seen that SOB! Was an absolute riot. And we were only in 11 feet of water! Absolutely blew my mind.


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Gearhead
07-25-2018, 06:48 PM
ya 550 would be nice... but that price tag hurts!

dakota4ce
07-25-2018, 07:14 PM
ya 550 would be nice... but that price tag hurts!

For sure. I won’t do it.


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Gearhead
07-25-2018, 07:32 PM
This came in today.

27381

dakota4ce
07-25-2018, 07:39 PM
Nice! Get it going!!!!


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Gearhead
07-25-2018, 08:51 PM
Won’t be boating till 2 weeks. I will report how it does

dakota4ce
07-25-2018, 10:13 PM
Won’t be boating till 2 weeks. I will report how it does

Unacceptable answer.


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Gearhead
08-05-2018, 10:24 PM
Ok I put the prop on tonight. Testing tomorrow. Fingers crossed!!

DatTexasBoy
08-06-2018, 10:08 AM
Ok I put the prop on tonight. Testing tomorrow. Fingers crossed!!

This Guy!!!!

Gearhead
08-06-2018, 02:47 PM
Ok ran the 950 today. Has more bottom then the 2775. Same exact surf rpm speeds though. Oj is sending me a 951 to try which is a 15x14. I will report back. So far I like the 950 better then the 2775. But main goal is lower rpm. Top speed on the 950 is 38. I should have the 951 tomorrow. I’m at the lake for a week.

DatTexasBoy
08-06-2018, 04:15 PM
Ok ran the 950 today. Has more bottom then the 2775. Same exact surf rpm speeds though. Oj is sending me a 951 to try which is a 15x14. I will report back. So far I like the 950 better then the 2775. But main goal is lower rpm. Top speed on the 950 is 38. I should have the 951 tomorrow. I’m at the lake for a week.

What were specs on 950?

Gearhead
08-06-2018, 06:24 PM
950 is a 15x13.

Gearhead
08-07-2018, 07:02 PM
The OJ 951 was a failure. 15x14. It lowered rpm a lot!! I though I had a winner. Cruising was killer. 31 mph at 3500. Ballasted up. Wouldn’t get above 9 mph ��. I’m not sure what to try next. As for now I’m gonna keep the OJ950 I like it a tad better then the acme 2775.

dakota4ce
08-07-2018, 07:42 PM
The OJ 951 was a failure. 15x14. It lowered rpm a lot!! I though I had a winner. Cruising was killer. 31 mph at 3500. Ballasted up. Wouldn’t get above 9 mph ��. I’m not sure what to try next. As for now I’m gonna keep the OJ950 I like it a tad better then the acme 2775.

Maybe add cup to a 2775—?


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Ryann
08-07-2018, 07:49 PM
I've contacted OJ and they said the 950 is what they recommend. Not sure if my spare will be a 2775, 950 or something else.

Gearhead
08-07-2018, 08:27 PM
The 950 works. But it runs same rpm as the 2775.

There is the acme 2773 which could work.

I might try and add some cup to one of my props and see if rpms come down at all.

It’s a shame that the motor has to run at 3800-4000 rpms to surf.

They will drop some if you run lower bow pitch, but then you loose some wave quality.

dakota4ce
08-07-2018, 10:07 PM
I added cup to a 15x11 and it made a wonderful difference (can’t recall the prop number). It was for my MB Tomcat—about 1.5 years ago.

I was skeptical, but it was better for sure.


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Gearhead
08-07-2018, 10:14 PM
I think this is my next move.

I guess I could ditch the lead too...... but who wants to do that!

shockthis
08-08-2018, 02:16 AM
I am running 900lbs over stock and had 3 adults and 3 kids in the boat at 11.6( at 12.1 mph we run 3500-3600 rpm) mph and we running 3400-3500 rpms. I have a 2775 with a 450.
I have noticed that as soon as you change from a pitch of 8.5 to 9.5 the rpms climb from 3400 rpms to 3900 rpms. Maybe lower your pitch a bit and your motor will love you.

dakota4ce
08-08-2018, 09:03 AM
Exactly this ^^

Seems like an SL450 reaches its limit with 1000+ added weight and 10+ degrees of pitch?

Maybe there’s a sweet spot prop yet?


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Gearhead
08-08-2018, 09:27 AM
I am aware of the pitch and rpm issue. The wave is killer at a Pitch of 10. I can’t seem to hit anything lower then 10 with out using a ton of smart plate.

euro2012
08-08-2018, 09:47 AM
I am aware of the pitch and rpm issue. The wave is killer at a Pitch of 10. I can’t seem to hit anything lower then 10 with out using a ton of smart plate.

Why not move your lead a bit more forward, rather than raising the rear with more smart plate? Wave will have more push further back and your rpm's will drop a bunch with pitch at 8.5-9.

shockthis
08-08-2018, 10:48 AM
Why not move your lead a bit more forward, rather than raising the rear with more smart plate? Wave will have more push further back and your rpm's will drop a bunch with pitch at 8.5-9.

yup I agree, move your weight forward and smart plate at 20(which is very little).

Where do you have your extra weight at?

Ryann
08-08-2018, 10:49 AM
I am running 900lbs over stock and had 3 adults and 3 kids in the boat at 11.6( at 12.1 mph we run 3500-3600 rpm) mph and we running 3400-3500 rpms. I have a 2775 with a 450.
I have noticed that as soon as you change from a pitch of 8.5 to 9.5 the rpms climb from 3400 rpms to 3900 rpms. Maybe lower your pitch a bit and your motor will love you.

I’m seeing identical rpms. 2775. Pitch between 7.5 and 8.5. I put 400 lbs lead as far back as possible (100 lb in surf locker). Full tanks, wake plate at 0-20. The SL likes weight in the back. If you want high pitch, the bow has to drain.

Ryann
08-08-2018, 10:54 AM
And I’ll be the first to dislike 10 degrees of pitch. I tried it and had no luck. Big but mushy. I used ragboys numbers.

Mine likes 8 degrees. Now, there could be a calibration error that gives us different pitch and roll numbers. We are, after all, only talking about +/-2 degrees.

euro2012
08-08-2018, 02:02 PM
And I’ll be the first to dislike 10 degrees of pitch. I tried it and had no luck. Big but mushy. I used ragboys numbers.

Mine likes 8 degrees. Now, there could be a calibration error that gives us different pitch and roll numbers. We are, after all, only talking about +/-2 degrees.

Completely agree. 10 degree pitch was way too much for us as well. Best was around 8.5.

Gearhead
08-08-2018, 04:23 PM
If you didn’t like pitch at 10 you were going to slow.

Gearhead
08-08-2018, 04:26 PM
Also my front ballast never drains. I run 400 lbs lead mid ship and 200 in rear locker. If your front bag is draining it’s because you don’t have enough rear ended weight.

Gearhead
08-08-2018, 05:37 PM
Did some more testing with the OJ950 today. I pulled 200 lbs of lead out of my surf locker, but had 320 lbs extra people today. My observations today were better. 3500-3600 at 11.6 pitch 10. When I run the rear lead I’m usually higher then pitch of 10, just a tad over it. With out the rear lead it was dead on 10 or just under. So I’m thinking for me pitch of 10 is the sweet spot for my tastes and I can live with those rpm. I’m going to play some more with the extra 200 lbs and see if I can get more results. The lead in the rear helps keep center bag 100 full, so gotta fins that sweet spot.

Jeepers
08-08-2018, 07:08 PM
This is an interesting thread. I’m totally surprised at the high rpms. I have an 08 Moomba LSV with the 5.7 mpi, 4000#’s of ballast, ACME 2315 (15x12) and I’m only pulling 2800 - 3100 rpms regardless of human weight or surfing speed.

As for your prop selection: you want to start with the largest diameter prop you can fit. Diameter is the key for surfacing; Think tug boat! As an example the Nautique G series has a 17” diameter prop!!! As for pitch, you want the highest pitch you can get and still hit WOT max rpm fully weighted (ballast at 100% + human weight.). For my 5.7 that is 5200rpms. I’m not sure what it is for the Raptor. For every 1” decrease in pitch your rpms will increase by 150-200 rpms and for every 1” increase in pitch your decrease by 150-200 rpms. 1” change in Diameter will will decrease or increase your rpms by approx. 500 rpms.

Cup will only help your top end speed. In fact, too much cup will create stern lift which is counter productive to surfing.

Don’t trust the folks at WakeMAKERS. They are friggin clueless when it comes to prop selection. To fine tune your pitch, work with a local prop shop. Again, once you have your Diameter set, a prop shop can adjust your pitch up or down 2+ inches and add or remove cup. Which means there is no reason to continually be buying and swapping props. Of course ACME, OJ, Nettles and WakeMAKERS don’t want you to know this!!

One thing to note. It’s always a give or take; if your prop is optimized for surfing your top end will suffer. My top end is only 33mph. However, we live on a smaller lake and not in a hurry to get anywhere. The boat does a great job wakeboarding and even pulling the kids on the tube.

Hope this helps!! Just a hunch, but I would guess a 16 x 12 will put you where you need to be.


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Gearhead
08-08-2018, 09:40 PM
Yes the 16x12 we have discussed. Elevated concept was going to try one out. Waiting on his findings. I was worried about clearance to bottom of boat.

Jeepers
08-08-2018, 11:03 PM
Yes the 16x12 we have discussed. Elevated concept was going to try one out. Waiting on his findings. I was worried about clearance to bottom of boat.

As long as you have 1/2” between the outermost blade tip and the hull you’re good. Just make sure it clears the trailer! It’s pretty easy to raise the rear trailer bunk with a poly spacer though. I would bet there’s room for a 16.25 or 16.50! But a 16 should be plenty!

I’m interested to hear the results!


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Slinger
08-09-2018, 03:49 AM
Yes also really interested in the 16 x12 with 450 test result...

DatTexasBoy
08-09-2018, 10:06 AM
Yes also really interested in the 16 x12 with 450 test result...

Yes we all are...…. Still waiting to hear!!!!!!

pedel
08-13-2018, 01:31 AM
I finally received my 2775 and spent a few hours with it. I’ve now tried all 3 factory props and this is definitely the right surf prop for my sl450. It knocked about 3-400 off my surf rpms and definitely lower rpms cruising back to the dock. Averaged 6.5 GPH for the first 4 hours and that was with a lot of starts and stops while my ids were working on new trips. Surfing 11.2 mph with 2 in the boat + 900lbs lead and a full tank.


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Gearhead
08-13-2018, 10:03 AM
I ran the OJ950 the rest of the week. And I like it over the 2775. ran 3600-3700 RPM for most of the week. 11.6-12mph. 600 extra lead. 4 adults 3 kids. The 2775 and 950 are very very similar.