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  • Tech Talk GPR-P Class

    This is the place to ask questions and share general tuning information regarding the GPR-P class.

    Terry

  • #2
    Magnets? What are they good for?

    I have an HRS under my 917 Porsche and need help with choosing a magnet. I've heard some of the RAA guys talk about a bar magnet out of a Scalextric as being a good one.

    Terry

    Comment


    • #3
      I had good results with the largest Scalextric bar magnet in my RAA '05 car; but I have already tried it, and found it is too wide to go inside a Slot.It motor pod, except at the rear, where it would be offset to one side. You could try slicing the end off with a rotary disc, or just looking around for a size that fits.

      Comment


      • #4
        Isn't there only one magnetic track? If there is only one the magnet doesn't really matter where it is as long as you place in the top 10. The car running on the non-magnet tracks needs to be the strong point

        Comment


        • #5
          There are 5 magnetic tracks involved: 2 x Sport, 1 x Polistil, 1 x NINCO, and 1 magnabraid.

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          • #6
            5 magnetic tracks GREAT

            Comment


            • #7
              Gpr

              Robert,

              I tried to fit the bar mag in the HRS and ran into clearance problems also. Still unsure of placement though.

              Terry

              Comment


              • #8
                Terry's conundrum now seems to be ...

                ... that he needs someone to tell him where to ...

                Comment


                • #9
                  Just do the opposite of what Paul is doing.

                  Works for most people.

                  Comment


                  • #10
                    . . . put the magnet?

                    I'm not tellin!

                    Some people think they should be right under the rear axle (sidewinder), or just ahead of it (inline, if the crown gear is small enough). Other people think they should be ahead of the motor. Some people put them under the motor (as on the TSRF chassis). I think everyone agrees that there is an optimum downforce, but it is unknown for the GPR tracks. Suffice it to say that a Scalextric bar 1/16" above the rails will work well. If a smaller magnet, well, you can't get any lower than ~1/16", according to the rules.

                    GPR Rules:
                    "C. Specific Prototype Chassis Rules
                    1) A single traction magnet is permitted. Underside of magnet must be covered or recessed into chassis, to prevent short circuits across the track rails. Underside of magnet cover must clear road surface by at least 1.5mm."

                    The intent is to keep the magnet underside flush with the bottom surface of the chassis pan. If it projects below the chassis, it must be covered by a non-conductive material that won't easily peel off (tape is not a good solution). If it is flush with the chassis, or slightly higher than the chassis, it need not be covered with anything. But, if it short-circuits on sombody's track halfway across the globe, they have the option of sidelining the car, or worse, "repairing" it.

                    Comment


                    • #11
                      I'll stop beating around the bush.

                      I figured if I started this magnet discussion, a few people might accidentially reveal some placement tips.
                      You guys are good. No sharing secrets here. Hey don't forget who shared the polished axle tip with you either. Yes, it was me.

                      I plan to fit a magnet at the back of the HRS chassis, behind the motor. Since I have no way of tuning for a mag car, I'm guessing for the best here.

                      Terry

                      Comment


                      • #12
                        If only there were someplace that a guy could go and look at photos of proxy cars with their bodies off....

                        By the way, I haven't put a magnet in my car yet so I got nuthin', especially in light of my entry being my first HRS car.

                        Comment


                        • #13
                          I can help!

                          I figured if I started this magnet discussion, a few people might accidentially reveal some placement tips. You guys are good. No sharing secrets here.
                          Okey dokey here you go. First off, do not try to install your magnet into the chassis with a router unless you are really good with fine machinery. Second off, if you do install a magnet in this fashion, don't use a heavy duty Scalextric bar magnet flush with the bottom of the chassis in combination with a stock Mabuchi motor. It will smoke and smell funny and grind to a halt in Colorado. Third off, if you use a Boxer/NC style motor mount in a Slot.it then there's only one place you can stick it anyways.

                          Now, no more complaints about fellas being unwilling to assist. Also, if you want to go Proxy Racing and need helpful hints then the last place to look is in a Proxy Forum cause we all know who you are and what you're up to; post in Technical or someplace like that and everyone will jump in with advice, some of which might even be helpful.

                          And, in honour of Kurt's ongoing attempt to keep us all amused and intrigued with his current round of the RAA, here is a picture of the field from last year's event. Many magnets in evidence here, obviously.

                          Comment


                          • #14
                            Hey Paul,

                            All those cars in the photo you posted appear to be really stuck...er...up.

                            There is no mystery to magnet placement. Just ask anyone who owns a Scalextric MG Lola. Less than 300g of downforce with an 18k motor and the thing handles like it's on rails. Study one of these cars in terms of magnet height and postion and you are on the right track. If you're running an inline boxer motor in an HRS chassis then your choices are limited. Heavily magged cars are no fun to drive and difficult to corner IMHO.

                            I still got nuthin'...

                            Comment


                            • #15
                              Originally posted by Wet Coast Racer
                              Okey dokey here you go. First off, do not try to install your magnet into the chassis with a router unless you are really good with fine machinery. Second off, if you do install a magnet in this fashion, don't use a heavy duty Scalextric bar magnet flush with the bottom of the chassis in combination with a stock Mabuchi motor. It will smoke and smell funny and grind to a halt in Colorado. Third off, if you use a Boxer/NC style motor mount in a Slot.it then there's only one place you can stick it anyways.
                              See, don't do what Paul does.

                              Comment

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