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Tuning carbs with dyno?

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    #1

    Tuning carbs with dyno?

    So my mechanic wants to install a small rivnut on each of my headers so he can hook up O2 sensors and tune the power band on the dyno. He says that being able to directly measure the exhaust will allow him to more finely tune the carbs than just syncing them would.

    Has anyone else done this? I totally trust him but wonder if it's necessary on this setup (82GS750E stock)
    Tags: None
    #2
    Anyone have a link to posplayr's thread?
    1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
    1985 GS1150ES stock with 85 Red E bodywork.

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      #3
      overkill............

      Comment

        #4
        Good mechanic.

        Comment

          #5
          I tried searching for a posplayer thread but didnt find it. I agree about the mechanic, Mike is a true professional!

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            #6
            is this a buddy deal or do you have to pay for parts and dyno time?
            i'm just curious.

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              #7
              Unless you want to jet each carb individually you really only need 1 (one) O2 bung, located after all 4 pipes come together, either the collector or the muffler. I haven't done it on a bike (yet) but I have done lots of cars.
              It has to be welded in, and when he is done he has to plug the hole.

              Comment

                #8
                Buddy deal, he wants to put in a threaded insert in each pipe then seal after with ss bolts.

                Comment

                  #9
                  Unless you're racing it, a single reading point rear of the collector cone is all that's needed.

                  After that, you can confirm that all carbs are tuned optimally by plug reading.
                  :) The road to hell is paved with good intentions......................................

                  GS 850GN JE 894 10.5-1 pistons, Barnett Clutch, C-W 4-1, B-B MPD Ignition, Progressive suspension, Sport Demons. Sold
                  GS 850GT JE 1023 11-1 pistons. Sold
                  GS1150ES3 stock, V&H 4-1. Sold
                  GS1100GD, future resto project. Sold

                  http://i155.photobucket.com/albums/s...s/P1000001.jpg
                  http://i155.photobucket.com/albums/s...s/P1000581.jpg

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                    #10
                    Originally posted by MikeG View Post
                    Buddy deal, he wants to put in a threaded insert in each pipe then seal after with ss bolts.
                    It actually uses a standard O2 sensor bung and plug. Be sure and get SS bungs and plugs, and make sure the plug is the Toyota type with a bolt head on it. Most of the cheaper ones use an allen fitting and it gets stuck and then strips out. And use some anti-seize on the threads.
                    AFA doing all 4, you may gain a couple or three horsepower, but you will end up with different jets and settings on each carb. So be sure and track what he puts into each carb.

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                      #11
                      Is this to be done on stock pipes or an aftermarket header?

                      I ask because the stock pipes are double-walled. After installing the bung, how are you going to assure that the inner pipe is also sealed against the bung?

                      .
                      sigpic
                      mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                      hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                      #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                      #2 son: 1980 GS1000G
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                        #12
                        If it were being done on stock pipes you would have to first bore the hole in the header, slightly smaller than the exterior diameter of the bung you would use. Weld the outer and inner pipe together inside the hole then weld the bung to the exterior pipe.

                        Comment

                          #13
                          If it is a stock exhaust and carburetors, I don't see any gain, work has already been done.

                          Aftermarket header and pods on the stock carburetors, it makes it easier to set up the jetting, but most that work has already been done as well. IE: jet kit.

                          Aftermarket carburetors/pod filters and header would make it much easier to tune with a wide band O2 set-up.

                          I'm running a set of VM29s with pod filters and a V&H exhaust, which I have also installed an Innovate wide band O2 sensor on a GS700E, and it is worth every penny.

                          But, you say it is stock.

                          Have to agree with blowerbike, overkill............

                          Comment

                            #14
                            Originally posted by tejasmud View Post
                            Aftermarket carburetors/pod filters and header would make it much easier to tune with a wide band O2 set-up.

                            I'm running a set of VM29s with pod filters and a V&H exhaust, which I have also installed an Innovate wide band O2 sensor on a GS700E, and it is worth every penny.
                            Hi!
                            What model, etc. did you get? What kind of $$$ is required for such a set up? Do you have a link?
                            Thanks!
                            2000 Honda Valkyrie Tourer (it's gone)
                            1985 Suzuki Madura GV1200
                            2 X 1980 Suzuki GSX1100ETs (next project                            s)

                            Comment

                              #15
                              Originally posted by quexpress View Post
                              Hi!
                              What model, etc. did you get? What kind of $$$ is required for such a set up? Do you have a link?
                              Thanks!
                              Here is a link to Innovate Motorsports. http://www.innovatemotorsports.com/products/lm2.php

                              I purchased a LM1 several years ago, which is now obsolete, but next Gen is the LM2.

                              A basic LM2 Kit is all you really need for data logging AFR, $349 off their site, but they can be found for a little less. Then there are accessories if desired, but not really needed.

                              I have a LM1, and a LMA2, which connects to the LM1. For the LMA2 I have a RPM clamp, thermocouple for CHT, a string pot for TPS, and a speed sensor for MPH (magnet split collar type). Use it to tune the bike, but then I take it all off after I'm done.

                              Also have a LC1 with DB gauge (digital), but it can't record any data. They run around $200.

                              Innovate Motorsports 3795 Innovate DB Digital Wideband Air/Fuel Ratio Gauge with LC-2 Kits | Summit Racing
                              http://www.summitracing.com/parts/INN-3795/
                              Free Shipping - Innovate DB Digital Wideband Air/Fuel Ratio Gauge with LC-2 Kits with qualifying orders of $109. Shop Gauges at Summit Racing.

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