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  1. #1

    Join Date
    Apr 2019
    Location
    Jacksonville, FL
    Posts
    21

    Solas 13/18 vs 13/20 Why Bother With 13/18 If Modded?

    It seems like a lot of people buy the 13/18 impeller but then they have to repitch the impeller because they are turning too many rpms, so why not just get a 13/20 instead?

    I initially saw this when reading the sticky post from the Green Hulk GP1800 build where it was hitting the 8800rpm limiter with a 13/18 and stage 2 mods setup. Pitch was then added to bring the rpms down. I have come across a handful more comments where people have to add pitch so it seems like a waste to me getting the 13/18 if you are more than stage 1 or 1+ no? Stage 2 seems to be a super common setup and I assume most wouldn't want to have to bother with doing retainers and spinning real high rpms so why not just go 13/20 right off the rip and save some headache of having to take the ski back apart?

    Am I missing something on why the 13/18 is chosen over the 13/20 so much when you just end up repitching it?

  2. #2
    Just my 2 cents, I have a 2018 GP1800 and am 1 of the guys who wishes he had gone 13/20. My wish has no actual facts but personal feel. On calm/slight chop I cruise at about 75% throttle, 7200ish rpms and 68-70mph. When going WOT, my speed will instantly increase to 78-82mph @ 8500 rpms. I just don’t like the way the motor screams at 8500 and that’s nothing more than personal reasons.

    I would gladly have sacrificed a little mid range knowing that I could run same MPH and lower RPM. Seems like only 1 person said it was stupid but listed no factual info to back it up. A lot of other members who Ive seen contribute a lot of info said it was worth a try to go with a 13/20.

    It seems like somebody could be of great service to our community here by doing a comparison. I would gladly supply my prop or swap a supplied prop and do some unbiased testing.

  3. #3

    Join Date
    Apr 2019
    Location
    Jacksonville, FL
    Posts
    21
    What modifications do you have, stage 1+ or 2? I am also of the thinking to be easier on the engine (lower rpms) run the 13/20 and figure it would be a hair better for "mileage" as well if cruising long distances. I have a 2017 GP1800 and currently have a Worx air intake, ribbon delete and 2019 ride plate with Riva 1+ tune on stock impeller and it pulls hard now so even just a hair better with a 13/20 would be more than acceptable while having the benefit of less rpm for engine longevity and mpg.

  4. #4

    Join Date
    May 2008
    Location
    Richmond, TX
    Posts
    32
    Thank you for posting this - I just picked up a 2019 and plan to go stage 2 in the next 2 weeks. Wondering this same thing.

  5. #5
    Urban worm, your thought are exact same as mine. I run Riva Stage 1 plus Aggressive Throttle response and all supporting mods. I can tell you my 13/18 pulls hard all the way to top speed. I too would be happy to pull a bit harder than stock but run my numbers at a lower rpm.

    Texas347, I would really like to know the differences between Stage 1+ and Stage 2. What more is there besides higher RPM limit. I’m all for the intercooler but why not run Stage 1+ which I would guess has more timing and the 13/20 to turn lower RPMs ?

  6. #6
    I regret going 13/18, wish I would have picked up a 13/20 from the start.

  7. #7

    Join Date
    May 2008
    Location
    Richmond, TX
    Posts
    32
    What is considered the “safe limit” of RPM if you have titanium keepers and like to do long river rides where you may be WOT for a while?

  8. #8
    Saum700p's Avatar
    Join Date
    Sep 2017
    Location
    New Orleans
    Posts
    346
    +1
    49
    13/20 running 8,750 rpm @ 87.4 mph... Pleased with my choice of impeller. no cavitation issues, and get better fuel milage then my buddy's stock gp when we cruise 50-70mph range.


  9. #9

    Join Date
    Apr 2019
    Location
    Jacksonville, FL
    Posts
    21
    Kind of surprised, I figured there would be more talking going about this.

  10. #10
    I think you had your answer like I did before you put the post up. It currently 92 here in Dallas, as soon as it’s 100 degrees I will see how bad weather effects top speed. If I can still hit 80, I’m going to a 13/20. Serval threads over the last few days that have me convinced if I’m willing to give a little mid range pull that I will be happy. Then I will have a slightly used 13/18 for sale.

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