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  1. #1
    Part of the furniture BasicQ's Avatar
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    Default Anyone tried dragy gps performance meter?

    Got one the other day. Seems like a good thing.

    Measures 1/8th, 1/4, even half mile et. Can measure time for speed to speed such as 0 - 100kp/h and allows custom inputs such as 80 - 120kp/h or whatever you want. Has a speedo of course and a video function where it records the data and a video at the same time. I’ll try and get an example of that soon. That can be uploaded to a feed where you can see others data.

    Good thing for a bit of fun and tuning. Haven’t tried it in the Monaro yet but went for a spin in the box stock LS1 Calais.

    [img]https://i.ibb.co/XxVsYs3/20211116-164345.jpg[/img]

    [img]https://i.ibb.co/JmCDKzy/Screenshot-20211116-164711-dragy.jpg[/img]

    [img]https://i.ibb.co/3F6MVw2/Screenshot-20211116-164802-dragy.jpg[/img]

    [img]https://i.ibb.co/GpfyJRB/Screenshot-20211116-164838-dragy.jpg[/img]

    [img]https://i.ibb.co/HNJ1Cqz/Screenshot-20211116-165021-dragy.jpg[/img]


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  2. #2
    Do you ever leave?
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    Default

    There are a few guys on here using them.

  3. #3
    Part of the furniture BasicQ's Avatar
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    Quote Originally Posted by HQ 368 View Post
    There are a few guys on here using them.
    I haven’t given it much of a go.

    Useful thing or mostly a novelty?


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  4. #4
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    Some of the tests ive seen against the timeclocks at the track on another forum seem encouraging.

    Seems like another useful tuning tool, when I used to mess around with carburettors a fair bit I was using the timestamps on the datalogger to see gains/losses but that was mostly 0-100 stuff and 1/8th mile when I was feeling brave.

    I also had the original G-tech before that but it was so damn fiddly to set up I think I used it a couple of times and its been sitting in the cupboard ever since.

    My "private test road" that I had marked out now has about 8 million houses on it haha.
    Last edited by guy incognito; 17-11-2021 at 10:08 AM.

  5. #5
    Part of the furniture BasicQ's Avatar
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    Default Anyone tried dragy gps performance meter?

    Gave it a crack today at Ballarat airport. Pretty accurate. Always read a little slower than time slip (.05~.08 sec) and a little different speed wise.

    I am assuming slower due to dragy readings beginning when it senses movement and track timing not until beam connects, and speed variations due to how the track timing uses two boxes at the end of the track to calculate speed? See screenshot below where 60” is 1.83s, timing slip had that as 1.79s. 149.07km/h on dragy is 92.98mp/h (149.63kp/h) on timing slip.

    I like the orange acceleration (G’s) on the graph. See the difference between a run with reasonably good traction (still no dead hook) and the slower run that blew the tires off most of the 1/8th.

    [img]https://i.ibb.co/tP77pvL/Screenshot-20211127-183201-dragy.jpg[/img]

    [img]https://i.ibb.co/NytSqqR/Screenshot-20211127-183225-dragy.jpg[/img]

    Fun day out learning the best burnout with these 235 Mickey Thompson S/S radials. Never got a dead hook but different methods reaped improved traction for the majority of the run.

    Also tried Mighty Demon 850 annular (1.56” venturi x 1.75” throttle) and Race Demon with gold sleeves and downleg (1.500” venturi x 1.75” throttle). Both et @7.63s, annular 90.9mp/h, Race 92.98mp/h. Not 100% perfect comparison as traction was not perfect for both runs but very similar runs.
    FWIW Barry Grant called the annular 820cfm and Race with gold sleeves 975cfm.
    Last edited by BasicQ; 28-11-2021 at 05:07 AM.

  6. #6
    Do you ever leave? ynot8's Avatar
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    I bought one a while back, mainly for tuning purposes, mainly 0-100kph standing starts.
    It worked well initially, but last time I went to use it, it wouldn't pick up a satellite.

    I had a go it again about a week later and same issue. So I don't know if it's stuffed up.
    Also would like the ability to switch it off. From memory there is no power switch. So you fairly much have to charge it before you use it every time.

    And yeah, biggest problem is finding a suitable test track without attracting the wrong sort of attention or just pissing off local residents. I've got a lot of rural areas within 10 minutes drive from home, but every half decent straight road has some sort of houses on it!
    you can't put a price on FUN

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