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  1. #21
    Join Date
    Aug 2017
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    947

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    Quote Originally Posted by Isaguel View Post
    OK. Did some reading on propeller pitch. Now, does anyone have the 16x15 prop option on a new Supra with the 1:76 tranny gear ratio? Or know of someone who has it?. I know these boats are not built for speed and I'm not concerned about going fast, but, how much top end speed am I sacrificing by going to lower pitch. I don't mind loosing 2-4 mph but it would concern me if max speed dropped to the mid-hi 20's . Anyone have any info on this?
    Yes, I have the 19 SL450 with 1.76 and 16x15 prop. I'm at 2200' elevation. I'd really like to try the 16x17, because the rpms are around 3600-3700 at 11.5 ballasted and surfing. But it's not worth $700+ just to try it.

    Top speed for me empty was 36.4mph at 5350rpm.
    2019 Supra SL450

  2. #22
    Join Date
    Apr 2013
    Location
    Knoxville TN
    Posts
    3,065

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    Quote Originally Posted by Isaguel View Post
    MJHSupra. Let me ask you this question since you have the boat I am ordering. I ordered the SL 400. I plan to add 6-800 lb lead bags. I am still nervous about the boats ability to pull its heavier weight, ballast and 6-8 passengers. I do plan to upgrade the prop. Have you found the 400 to be needing more torque? Do u use extra ballast?. It was hard to digest having to spend and extra 8300$ for an extra 40 lb/ft torque. That's the cost of a whole engine! Just trying to reach some peace with my decision, it's too late now anyways. Which prop are u using? if you upgraded.
    For surfing and lead, we run 500# on days with bigger crews 6-10, and 1000# on smaller crew days (3-4). The 500#s stays on the boat all the time. No crazy rpms and no issues out of the hole.

    For boarding, I run the beginner autowake setting, 500#s lead, and passengers. It's more than enough for anyone on the boat. Will the boat strain with advanced settings, full ballast, and wake speeds - yes. Dealer told me it would. I have not tried it.

    For the prop, not sure. I thought I had a pic on my phone to remember the model number, but it was the old prop from my last boat. Did not want to guess.

    Elevation is Knoxville TN, probably 1000'.

    Sent from my P00I using Tapatalk
    2018 Supra SL400

  3. #23
    Join Date
    Aug 2018
    Posts
    100

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    Quote Originally Posted by Isaguel View Post
    OK. Did some reading on propeller pitch. Now, does anyone have the 16x15 prop option on a new Supra with the 1:76 tranny gear ratio? Or know of someone who has it?. I know these boats are not built for speed and I'm not concerned about going fast, but, how much top end speed am I sacrificing by going to lower pitch. I don't mind loosing 2-4 mph but it would concern me if max speed dropped to the mid-hi 20's . Anyone have any info on this?
    I test drove several boats. Supra SA and SL both with 400's and 16x15 prop. Both maxed out at sea level at around 37-38 mph. I also drove FI23 and RI237 with the upgraded engine that compares to the 450. Maxed out top end speed about the same but RPM's were higher for those boats. Don't know what prop they were running and I believe the gear ratio is similar to the 1.76 of the newer Supra models. Bottom line is with a surf or wake board prop you can count on 35-38mph with either the 400 or the 450 depending on altitude if you are running without ballast.
    Thanks - D


    2020 Supra SL450

  4. #24
    Join Date
    Aug 2017
    Posts
    1,382

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    Quote Originally Posted by Shoebox View Post
    Yes, I have the 19 SL450 with 1.76 and 16x15 prop. I'm at 2200' elevation. I'd really like to try the 16x17, because the rpms are around 3600-3700 at 11.5 ballasted and surfing. But it's not worth $700+ just to try it.

    Top speed for me empty was 36.4mph at 5350rpm.
    At 1300’ with 1100 lead and crew of 5 my 2020 SL 450 could not pull the 16x17 consistently at 11.4 and above. Save your money. I have a 16x16.25 OJ on now and may move to the 16x15. For some reason I think the 16x15 will be the best. It’s just gonna have to be running high 3000s. That’s the way it is.


    Sent from my iPhone using Tapatalk

  5. #25
    Join Date
    Aug 2017
    Posts
    947

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    Quote Originally Posted by dakota4ce View Post
    At 1300’ with 1100 lead and crew of 5 my 2020 SL 450 could not pull the 16x17 consistently at 11.4 and above. Save your money. I have a 16x16.25 OJ on now and may move to the 16x15. For some reason I think the 16x15 will be the best. It’s just gonna have to be running high 3000s. That’s the way it is.


    Sent from my iPhone using Tapatalk
    Good info, thanks!
    2019 Supra SL450

  6. #26
    Join Date
    Oct 2018
    Location
    Hockley, Tx
    Posts
    1,013

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    Has anyone tried the 15.5x18 (speed/surf) prop that Moomba has as an option right now?


    Sent from my iPhone using Tapatalk
    2019 Makai
    Raptor 450 w/ 1.76 Trans
    WakeMakers 1350s in the rear & 1K in Lead

  7. #27
    Join Date
    Aug 2017
    Posts
    1,382

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    Quote Originally Posted by TXSurf4 View Post
    Has anyone tried the 15.5x18 (speed/surf) prop that Moomba has as an option right now?


    Sent from my iPhone using Tapatalk
    I sure did on my Makai. It was ALMOST doable. Could not quite consistently pull heavy surf loads. It was damn close—but if the water was a bit rough or it was really hot and humid I could not get it to hold surf speeds. I was heavy—1500 lead and Bagbusters. 1300’


    Sent from my iPhone using Tapatalk

  8. #28
    Join Date
    Oct 2018
    Location
    Hockley, Tx
    Posts
    1,013

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    Quote Originally Posted by dakota4ce View Post
    I sure did on my Makai. It was ALMOST doable. Could not quite consistently pull heavy surf loads. It was damn close—but if the water was a bit rough or it was really hot and humid I could not get it to hold surf speeds. I was heavy—1500 lead and Bagbusters. 1300’


    Sent from my iPhone using Tapatalk
    So would I be better off getting another 15.5x16.5 as my spare/backup prop? I was going to try the 15.5x18 one as it was said to lower RPMs a little bit and still pull. I have no complaints with the RPMs but liked the idea of lowering them while still maintaining the same performance.
    2019 Makai
    Raptor 450 w/ 1.76 Trans
    WakeMakers 1350s in the rear & 1K in Lead

  9. #29
    Join Date
    Aug 2017
    Posts
    1,382

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    Depends what you run for ballast. It did not do it for me, I sent it back. 2019 450 Makai.


    Sent from my iPhone using Tapatalk

  10. #30
    Join Date
    Aug 2017
    Posts
    1,382

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    I also ran a 16 X 16.25 on it for quite a while. That also works pretty darn well, I did get just a tiny bit of gel burn from it. But I am talking tiny bit. A friend of mine also has that propeller on his and has not gotten any burn. That particular propeller is an OJ, not sure what number though.


    Sent from my iPhone using Tapatalk

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