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Thread: tuning your jet

  1. #1
    mexrunner
    was wondering how you guys decide when to add/ remove shims in your ride plate, shoe, and or change your loader grate around. how big of a diffrence does a fine tune nozzle make? and if any of you rogers tr guys could help me out on some base settings i'm running a b impellor/ cav reducer in a blue printed pump with open center grate, shoe is 2 deg backcut has an agressor droop and normal place diverter. turns 5900rpm. but dont think its running as fast as it should be :idea: thanks in advance Adam

  2. #2
    SmokinLowriderSS
    Oh, Oh, another AGRESSOR droop! :jawdrop: Well, maybe you don't have the muscle to explode it. :220v: Ya'll need a GPS for good speed checks to work with the voodoo tune. I'm not a good authority on what ya need to do tho. I'll defer to others.

  3. #3
    mexrunner
    any one else?

  4. #4
    MikeF
    was wondering how you guys decide when to add/ remove shims in your ride plate, shoe, and or change your loader grate around. how big of a diffrence does a fine tune nozzle make? and if any of you rogers tr guys could help me out on some base settings i'm running a b impellor/ cav reducer in a blue printed pump with open center grate, shoe is 2 deg backcut has an agressor droop and normal place diverter. turns 5900rpm. but dont think its running as fast as it should be :idea: thanks in advance Adam
    When Cyclone was running a single carb 502, he was turning slightly less rpm (B impeller) and around 95 mph. I would address the pump 1st.

  5. #5
    Senior Member
    Join Date
    Apr 2010
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    2,920
    turns 5900rpm. but dont think its running as fast as it should be :idea: thanks in advance Adam
    What's it running now? (mph)

  6. #6
    cyclone
    was wondering how you guys decide when to add/ remove shims in your ride plate, shoe, and or change your loader grate around. how big of a diffrence does a fine tune nozzle make? and if any of you rogers tr guys could help me out on some base settings i'm running a b impellor/ cav reducer in a blue printed pump with open center grate, shoe is 2 deg backcut has an agressor droop and normal place diverter. turns 5900rpm. but dont think its running as fast as it should be :idea: thanks in advance Adam
    If the bottom of your boat is stock (no bubble on the keel in front of the intake) then don't bother shimming the shoe below the keel line. It was my experience that adding a .030 shim on a back cut shoe caused my pump to overcharge (65-75 psi intake pressure readings as recorded by a Qwikdata system) and actually slowed my boat down at the track. Shimming the shoe also made shutting down over 110 mph really sketching and the boat bucked like a bronco. The best move i made to help my old TR was to cut off the turning fin flush with the bottom of the boat. because it was disturbing the flow of water into the intake. i had similar hardware to yours except i had and American Turbine long droop snoot. The boat worked great, aired out incredibly and ran great out the back door as long as the water and wind were cooperative. This was with my blower motor. When i had the naturally aspirated motor in the boat, it was also very quick out of the hole.

  7. #7
    mexrunner
    cyclone i'm running your old pump. and not sure about the speed gps would only record up to 70 and then it was jumping all over the place so dont think that it was accurate. does have a 3/16 in stainless turning fin 54 in in front of transom but i'll give up the mph for the turning ability. also if you mean buy bubble when i blue printed the bottom i used fiberglass to even and smoothe the intrance into the intake.
    thanks Adam

  8. #8
    Senior Member
    Join Date
    Feb 2009
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    3,387
    adam, when you addressed the rounded keel leading into the intake are you sure you did not loose the form flowing into the pump (the bubble in the hull)
    tyhat will also lead to different loading prob's.
    Todd

  9. #9
    mexrunner
    todd when i smoothed it in basically there was about an 1/8 in ridge where the intake met the hull on the intake itself there is less than 1 layer of glass so the shape should be the same

  10. #10
    Senior Member
    Join Date
    Feb 2009
    Posts
    3,387
    call me tomorrow, i meant to ask you about that today!

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