Thread: 98 Cobra setup

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  1. Pat Goff
    Join Date
    Jun 2004
    Location
    Smithwick/Seadrift TX
    Posts
    10,618
    #21
    Somewhere between then (blowout) and now (bogging) is the happy place. Takes a little time to find it, but I usually start yanking plugs until I find blow out and then put the last combination back in and be done.
    Pat Goff

    Two degrees from center
    of nowhere.
    Smithwick TX.

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  2. Member
    Join Date
    Jan 2008
    Location
    Del Rio
    Posts
    84
    #22
    Well im back, ran various combinations of setups. end result boat just plows with 3 blade tempest plus 24p and 25p. started at 3.5 below the pad up to 1.5. only positive was I replaced plugs from 3xmed to 2xlrg 1med had better acceleration but still plows(wont jump out of the hole shot). finally ran a25p trophy 4 blade = slow hole shot, low rpms on pad. im completely lost. help help help......
    Last edited by mastodon1977; 01-06-2017 at 02:01 PM.
    Mastodon1977
    1998 Cobra 201
    1998 Johnson 225HP Venom

  3. Member
    Join Date
    Mar 2015
    Location
    Broken Arrow, Oklahoma
    Posts
    497
    #23
    Quote Originally Posted by mastodon1977 View Post
    finally ran a25p blade = slow hole shot, low rpms on pad. im completely lost. help help help......
    I'm assuming you ran a 4 blade? What kind? I run a 25 trophy on my cobra 180 with a 175 with 2 med. plugs and 2 holes open and it gets out of the hole very good and runs the same speed as my tempest. My prop to pad is 4.5" (I don't have a jackplate).

  4. Member
    Join Date
    Jan 2008
    Location
    Del Rio
    Posts
    84
    #24
    25p Trophy. I didnt mess w/ the plugs.
    Mastodon1977
    1998 Cobra 201
    1998 Johnson 225HP Venom

  5. Pat Goff
    Join Date
    Jun 2004
    Location
    Smithwick/Seadrift TX
    Posts
    10,618
    #25
    You gotta make the effort to get the vent plugs right, or you'll never know what's best.
    #1 Rule on boat setup, take it too far and bring it back. That's motor height, vent plugs, prop whatever, take it past then and only then will you ever find just right.
    Pat Goff

    Two degrees from center
    of nowhere.
    Smithwick TX.

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  6. Member
    Join Date
    Jan 2008
    Location
    Del Rio
    Posts
    84
    #26
    I spoke with Josh from Steve's Prop Shop. He said the prop needed to be BP'd and balanced. Guaranteed to make it run.
    Mastodon1977
    1998 Cobra 201
    1998 Johnson 225HP Venom

  7. Member
    Join Date
    Nov 2013
    Location
    Hilton,NY
    Posts
    204
    #27
    Quote Originally Posted by mastodon1977 View Post
    Well im back, ran various combinations of setups. end result boat just plows with 3 blade tempest plus 24p and 25p. started at 3.5 below the pad up to 1.5. only positive was I replaced plugs from 3xmed to 2xlrg 1med had better acceleration but still plows(wont jump out of the hole shot). finally ran a25p trophy 4 blade = slow hole shot, low rpms on pad. im completely lost. help help help......
    Mastodon,
    There is a lot of info missing, other than you are trying to run a Tempest+ 24 n 25P at various heights on JP. It is always a good idea to run a fresh tuned prop with balanced exhaust plugs, especially Tempest+. Once you got her up, what did she run speed, RPM, and water pressure? I believe that at 1.5" CS to P, you would have had a hard time trimming out without blowing out.
    Now, if you run a Trophy +, be sure you have an exhaust ring handy as well as plugs, 4 of them. If you start with solids and no ring, you can drill them 1/4" is S, 3/8" is M, 7/16 is L.
    Regardless if you run 3 blade for speed, or 4 blade best all around, make sure they are true to their pitch, and balancing is best.

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