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    On road dyno

    https://youtu.be/Lp0LvIQ2ZOI

    expensive, but interesting.
    When too much horsepower is barely enough

    #2
    Originally posted by biteme View Post
    https://youtu.be/Lp0LvIQ2ZOI

    expensive, but interesting.
    Impressive!!!

    Comment


      #3
      so it's a Gtech? I had the great idea to put load cells in rims to measure at the wheels torque (and derive power from this) but then saw that they had already been commercialised, so went on to invent other things that had already been invented instead.

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        #4
        In it's earlier iteration it was a Moroso Calculator, a weight shifted horsepower calculator, as such I quite like it.
        " Racing cars don't have doors. Toilets have doors" : Keke Rosberg

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          #5
          Originally posted by Roy928tt View Post
          In it's earlier iteration it was a Moroso Calculator, a weight shifted horsepower calculator, as such I quite like it.
          I've still got my 30yo Moroso slide rule

          Comment


            #6
            You could do the same thing 15 years ago with any chassis logger that had GPS and accelerometer data. Make a maths channel which used forward speed, frontal area, CD, weight and elevation change. Tweak variables to suit whichever brand dyno you prefer. I can't fathom why you would use a wanky thing that bolts on your wheel though.


            Interesting but in terms of a tuning tool I decided one of these would be far more useful. https://www.plex-tuning.com/products...alyser-logger/ actually know what the engine is doing and can still use the GPS/accel data to do an "at the wheels" power channel.

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              #7
              this is kinda cool



              not quite a wheel dyno though.

              Comment


                #8
                Many ways to fairly accurately determine performance on the road. Easy on the road in a car that's not too quick. Need a track or drag strip for something that gets your attention!

                Drag strip is most obvious. Trap speed can't be faked. Work out how to consistently launch it (not trying for best ever ET here) and you've got a very repeatable measurement of weight shifted power.
                I've done both GPS and wheel speed logging for on road tuning. Also good. Did this mostly because I CBF'd doing what I should have, whiich is next option below...
                Also have done strain gauge and telemetry gear attached to driveshaft, but only when I'm paid to for work! That's the best way to do it. But to buy the gear is a few grand and then a couple of hours or so to get it setup on the car at least. But if you really need to know, that's the way to go.

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                  #9
                  Originally posted by uuheels View Post

                  I've still got my 30yo Moroso slide rule
                  Same here.
                  Great tool

                  Comment


                    #10
                    Originally posted by 200MPH View Post
                    Many ways to fairly accurately determine performance on the road. Easy on the road in a car that's not too quick. Need a track or drag strip for something that gets your attention!

                    Drag strip is most obvious. Trap speed can't be faked. Work out how to consistently launch it (not trying for best ever ET here) and you've got a very repeatable measurement of weight shifted power.
                    I've done both GPS and wheel speed logging for on road tuning. Also good. Did this mostly because I CBF'd doing what I should have, whiich is next option below...
                    Also have done strain gauge and telemetry gear attached to driveshaft, but only when I'm paid to for work! That's the best way to do it. But to buy the gear is a few grand and then a couple of hours or so to get it setup on the car at least. But if you really need to know, that's the way to go.
                    Depending on the diff mounting arrangements, I imagine IRS with a couple or roller bearings instead of soft mounts and a load cell on the diff nose mount would be a tidy way of doing it without messing with the driveshaft.

                    Comment


                      #11
                      In a similar vein I just bought a dragy which seems very similar to the old gtech kinda deal. Finnegan was using it in one of his jetboats speeds but a few videos on YouTube show it to be very accurate at the drag strip. Good way to measure performance on the road consistently. Hopefully anyway.

                      I am a little worried doing 1/4 mile passes on the road as the car is pretty fast but 1/8 mile and 0-60 are better alternatives. I'll try it with my bt50 first to see how it goes.

                      Comment


                        #12
                        I wonder does this unit read in US HP as well as Rest-Of-World HP? or would you have to manually fudge the numbers to keep the yanks happy? /i

                        Funny enough I also bought a Dragy recently, but haven't had a chance to use it because of getting rained out, and then locked down here.

                        Although my main reason for getting on the Dragy bandwagon was purely to set a couple of cunts on the "leaderboard" straight, those claiming their cars are the fastest of that model in the world, and trying to jam implausible dyno numbers down everyone's throats.

                        I won't be doing any runs on public roads, that's just asking for trouble around here.
                        Jaguar XJR, Freelander 2 HSE, Jaguar XKR, MINI Cooper S
                        Originally posted by nutttr
                        People must assume you are some sort of drug dealer with all these nice cars turning up to a fibro home

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                          #13
                          I had a similar thought about other peoples cars all over to compare. But if you won't use it on the road where do you plan to try it out?

                          Comment


                            #14
                            Originally posted by Staples View Post
                            In a similar vein I just bought a dragy which seems very similar to the old gtech kinda deal. Finnegan was using it in one of his jetboats speeds but a few videos on YouTube show it to be very accurate at the drag strip. Good way to measure performance on the road consistently. Hopefully anyway.

                            I am a little worried doing 1/4 mile passes on the road as the car is pretty fast but 1/8 mile and 0-60 are better alternatives. I'll try it with my bt50 first to see how it goes.
                            I have a dragy and like you 1/4mile on the road is not something I’d do.

                            it’s pretty accurate by all accounts.
                            When too much horsepower is barely enough

                            Comment


                              #15
                              Originally posted by Staples View Post
                              I had a similar thought about other peoples cars all over to compare. But if you won't use it on the road where do you plan to try it out?
                              At the drag strip.

                              If I stay on the throttle for a second or so after crossing the line, that will give me the 0-200 or 100-200, as well as the 0-100 time from the launch, and it's also nice to compare what the dragy says for the 1/8 & 1/4 vs the timeslip.

                              Trying to get a good clean launch on the street is futile, compared to a nice prepped strip where you can do a controlled burnout to warm the tyres, and launch as hard as possible.

                              Plus it's safe, and legal.

                              Seems that 0-60mph runs are the new circle-jerk, the only way to get that nailed is at a prepped drag strip.
                              Jaguar XJR, Freelander 2 HSE, Jaguar XKR, MINI Cooper S
                              Originally posted by nutttr
                              People must assume you are some sort of drug dealer with all these nice cars turning up to a fibro home

                              Comment

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