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Read this: Info on 4-tec motors, injectors,rrfpr's, etc.

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  • Read this: Info on 4-tec motors, injectors,rrfpr's, etc.

    Attached is some info based on research done and information learned while recently trying to figure out why I was running lean with the addition of a Rude sc'r and rrfpr over the Rotax stage 3 kit I had previously. It was too cold today to go out and test, so I figured I would type this up and perhaps could help some others with similar questions.

    Mark
    Attached Files

  • #2
    Mark... outstanding!!

    absolute tremendous contribution to the forum, well done, VERY informative

    i like your apprroach and how you do things. dont just slap something on your ski without fully understanding how it affects each running condition of the motor and how it works and plays a role in performance.

    thanks!!!
    EZ Dock of Long Island
    Sunstream Boat Lifts
    516-468-DOCK
    Long Island, NY

    Comment


    • #3
      wow, I love technical information. that was very straight forward !
      Thanks for the reading ! is this a sticky candidate ?
      2000 Stock GPRXP ~ 83.6 / 7900 rpm
      2006 Stock RXP ~ 67.7 mph
      2000 Stage II GP1200R ~ 76.7 / 7400 rpm (retired motor 2007 for conversion build)
      www.wfoperformance.net


      Pics ~Pics & Mods~ / Keep the 2-Strokes Alive !


      Buy your Performance Parts at @ www.4tecperformance.com

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      • #4
        That was a great write up Mark! The math kinda went over my head but I get the idea. Based on the formula you put in the doc I am wondering if someone can build a HP calc in excel... any math/excel wizzes around? haha

        I agree with you regarding monitor whats going on with your motor... I am doing a few upgrades and am not even planning on cranking the motor up without an AFR guage and boost gauge hooked up. Going to add a fuel pressure gauge to that list now

        Thanks again for the great info!.
        09 RXT iS

        Comment


        • #5
          Mark, thank you very much for taking the time to type that all up and share it with us.

          This is a must read for anyone modifiying their skis.

          I'm going to stick this one to the top for a while.

          Thank you very much!
          Save money on your pwc performance parts! Use the discount code: greenhulk when completing the checkout process in the GREENHULK PWC Performance Store and save 10% off the listed price of MOST Riva Racing and ALL WORX Racing Products. We also offer Fizzle Racing, MaptunerX tuning bundle packages, and instant download tuning licenses at discounted prices.

          Shop now! www.greenhulkstore.com​​
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          • #6
            Mark is the real deal! THe first person I knew of that had a stageIII boat back in 05 with a 100 hours on it! He is definately a genuine guy! Good Job Mark! Very informative and your right about we need to monitor our engines more closely!

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            • #7
              Originally posted by Green Hulk View Post
              Mark, thank you very much for taking the time to type that all up and share it with us.

              This is a must read for anyone modifiying their skis.

              I'm going to stick this one to the top for a while.

              Thank you very much!
              how about puting it in the how to section faq there are alot of these we shouldadd to that section
              2004 rxp yellow,riva sponsons,,2\"pump wedge,Riva stage1 kit,S3 supercharger,42# injectors,15/20 -2mm,stock intercooler,riva finger throttle kit,hydro-turf seat and mats, rotax thru hull ceramickhromed, ride plate filled,denso ixu27 plugs ppg splash guard,jerry's skegs,RE's,riva stage 2 supercharger,jerry'smetal washers and ceramic bearings with 06 shaft update.best 73.9mph+

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              • #8
                95-100% duty cycle at 8100-8200 ?

                Visit our facebook page:
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                www.wfoperformance.net

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                • #9
                  Originally posted by aha View Post
                  That was a great write up Mark! The math kinda went over my head but I get the idea. Based on the formula you put in the doc I am wondering if someone can build a HP calc in excel... any math/excel wizzes around? haha

                  I agree with you regarding monitor whats going on with your motor... I am doing a few upgrades and am not even planning on cranking the motor up without an AFR guage and boost gauge hooked up. Going to add a fuel pressure gauge to that list now

                  Thanks again for the great info!.
                  Here you go.
                  Mark
                  Attached Files

                  Comment


                  • #10
                    Thanks for the calc Mark!!
                    09 RXT iS

                    Comment


                    • #11
                      That is so cool!! That means that I was making 285hp when I was testing my turbo rxt (see my turbo rxt thread)

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                      • #12
                        Great post....
                        "THE WORLD IS CHANGING VERY FAST. BIG WILL NOT BEAT SMALL ANYMORE. IT WILL BE THE FAST BEATING THE SLOW"
                        "IF YOU ARE IN CONTROL, YOU ARE NOT GOING FAST ENOUGH"
                        "SPEED COST MONEY. HOW FAST DO YOU WANT TO GO?"

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                        • #13
                          Wow.......just wow.
                          2000 GTX RFI
                          2005 RXP
                          Some stuff.

                          Originally posted by Green Hulk
                          The more boost you make the more fun you are going to have.

                          Comment


                          • #14
                            I, for one, can vouch for the fact that the stock ecu will command a 100% duty cycle. Most stock ecu's won't for fear of overheating the injector coil. Anyway, I've found that it's a funciton of boost, not rpm. I was able to get 100% DC at 7700 rpm or less at higher boost levels.

                            Mike
                            1990/2012 Eliminator Daytona 23' w/twin Hydrotec Stage 2 Yamaha 300 VMax HPDI's. 1??.? mph
                            2011 F-150 EcoBOOST. ??.?? @ ??.?

                            2004 RXP, 2Rude, AEM FIC, XS, stock ECU. ??.? mph. Sold!
                            2006 Checkmate Pulsare 2100 w/Yamaha 300 HPDI. 88.2 mph. Sold!
                            2008 Tundra RCSB, stock. 13.96 @ 97.0 mph. Sold!
                            2004 ZX-10R, stock. 10.0 @ 148 mph. Sold!
                            2004 RXP, GT32 turbocharged. 82.9 mph on the stock ECU. Sold!
                            1995 Z28 with a T76. 9.9 @ 146 mph @ 17 psi. Sold!

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                            • #15
                              Heres some quick conversions also
                              • Conversions
                              • 500cc per minute is approximately equal to 49lbs per hour which is equal to approximately 100hp.
                              • lbs/hour = cc per minute / 10.5
                              • lbs per hour = HP / 2.04
                              • cc per minute = lbs per hour x 10.5
                              • cc per minute = HP x 5
                              • HP = cc per minute / 5
                              • HP = lbs per hour x 2.04
                              Thanks
                              Frank

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