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Pyrometer question!

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  • Pyrometer question!

    so im lookin into gettin a tire pyrometer so i can check out my temps. i wanna learn to properly use my tires and i was wondering what affordable pyrometers are out there that are pretty good. i went onto ebay and saw alot of longacre products. anyone have any suggestions?

    thnx!!
    Jairo "Hido" J

    Gamble It Films!
    http://www.GambleItFilms.blogspot.com

  • #2
    Radioshack used to sell an infrared piece and that's what I have. Then there's the debate whether contact (thermocouple probe) or non-contact is better. I have used both and not much diff.

    Longarce outsourced their products anyway. So in general go to Raytek for infrared thermometers and Fluke for contact thermometers. In addition, to view a collection, visit here. Omega has everything you need to measure temperature. They have some contact thermometers for about $30 and measures up to 1300C.
    Technik Engineering ASA Stage 1.
    Supercharged E46 M54B25.
    2011 NASA TTC So Cal Champion!

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    • #3
      sweet thnx! ya i had heard about using probe type over infrared. havnt read too much into it but ill check stuff out! thnx alot. if anyone else has something to add i would greatly appreciate it.


      edit: jairo on my bros comp
      Last edited by andresj; 08-08-2009, 03:10 PM.

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      • #4
        Vince, so are you saying that there was no difference between using the infrared and the thermocouple probe pushed down to the carcass? My temps have always been off when comparing the two. What is your process?

        Hey, processes change, so if there's something new to learn, please teach.

        Traditionally, you MUST measure temps at the carcass. That means taking that thermocouple and pushing it into the tread until you cannot go any deeper. Temps vary too much when you pull the temp from the rubber. In addition to this, the tread looses temp a great deal quicker than the carcass, so if you're in a position were it's only you at the track having to do temps, you give yourself some cushion.
        Last edited by 2GRX7; 08-08-2009, 04:42 PM.

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        • #5
          wat do u use 2grx7?

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          • #6
            infrared don't work. period.
            S1 Supermiata - 220whp
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            • #7
              Me and a friend danny were playing with an infrared thermometer at frys today and there was so many things making it vary. like how far away the object was.

              as in like an inch difference or so. and it never stayed steady even if it was held in one spot pointing right at something.

              i say the contact one would make more sense to being accurate.
              LIKE A BOSS

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              • #8
                for tires a temp probe is required! I use the old version of this one http://www.longacreracing.com/catalo...id=200&catid=7
                AJ - Akua Solutions - #128 Lotus Exige - MonkeyWrench Racing - Carbonetic - Innovative Mounts - Toyo Tires - JRZ Suspension - TW Research Development

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                • #9
                  It's been said but I'll chime in too: don't waste time with IR for tire temps. Tires cool so quickly that it's not possible to test them fast enough and have it be meaningful.

                  Buy a probe pyrometer for the tires. For actual testing/setup measure in the hot pit. If you want IR for other things, the Harbor Freight one works fine. Know that all IR pyrometers have trouble reading on shiny/reflective surfaces. The difference between polished and slightly matte finish metals can be 30%. They'll read brake rotors okay if there is material transfer (but rotors cool quickly too).

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                  • #10
                    Originally posted by zjchaser View Post
                    for tires a temp probe is required! I use the old version of this one http://www.longacreracing.com/catalo...id=200&catid=7
                    thnx. thats one i was lookin at on ebay. wat do people use for track temps? the IR i would think right? thnx everyone for the help
                    Jairo "Hido" J

                    Gamble It Films!
                    http://www.GambleItFilms.blogspot.com

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                    • #12
                      DO NOT use an infrared sensor. The surface of the tire cools very quickly before you can get out of the car and measure it. Probe types go ~1cm into the tire to measure the carcas' temperature and while it also drops quickly, it retains more heat and is more accurate and all race teams use these (yes some have on-board infrared sensors but that's another story).

                      Measure in 3 points (outside, middle, inside), you ideally want a 20*F split with the insides being hotter, stay as far away from the edges of tread blocks as possible, and for the inside and outside measurements, don't measure within an inch of the edge of the tire, you want to stay away from the edges.

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                      • #13
                        Originally posted by andresj View Post
                        wat do u use 2grx7?
                        Sorry for the delay andresj. I've recently ordered this one.....
                        http://www.longacreracing.com/catalo...id=193&catid=7

                        But this one will work just fine....
                        http://www.longacreracing.com/catalo...id=200&catid=7

                        Utilize Stuntman's process and you'll be fine. One point on the splits- if in fact you are saying that the process should allow for a variance of 20deg. across the tread, do you mean that you should see your INITIAL pit in hot temps at such variance and use those numbers to set up suspension, or as your final variances? If its the ladder, I would find that a bit too wide a window. Single digit's a bit more consistent.

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                        • #14
                          A good idea for a cooldown lap is to go as fast as you can using as little brakes as possible (but still using a decent amount the first 1/2 lap). This keeps the temp up and more accurate readings in the tire since you still corner at 100% but are not working the engine or brakes much to cool them down.

                          When coming into the pits with the tire temps up from said advice, the general rule of thumb is to have the inside measurement ~ 20*F higher than the outside (ex: inside, middle, outside - 200, 190, 180)

                          If the outsides are less than 20*F and the spread is even, it can suggest adding more camber, likewise if the spread is too much, less camber. There also might be too much toe if the insides are overly hot. If the center is higher (relative to an even spread) it suggests too much tire pressure, and if both outsides are hotter than the center (again, relative to an even spread) more tire pressure is needed.

                          Billy

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                          • #15
                            Originally posted by J. Tyler View Post
                            Use a probe.
                            So many things things I can do with that statement...how about this one? You can use it for exercise AND as a probe...

                            [YOUTUBE]4S3C4AC908w[/YOUTUBE]

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