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  • Terry, the Mailman's Handling Code clearly states that it is permissable to narrow the tires to reduce traction, should your car stick too much.

    In fact, Philipe De Lespinay, who designed the TSRF car, has recommended narrowing the rear tires to reduce rollout and deslotting on the commercial tracks the TSRF car was designed for. In fact, the foam tires TSRF sells for that car are quite narrow. But I would try to work with the high traction you describe, which will result in a faster car if you can tame it. If the car is not lifting up on the two outer wheels and tipping out, the car is almost as good as it can get.

    The phenomenon you describe, where the car breaks loose, slides out, and grips again, typifies the harsh handling qualities of Ortmann tires. A little weight at the front may help with this, as will widening the track, lightening the body, lowering the CG, or using a body with less mass toward the rear. You also can learn to drive within the "speed window" of the tires. Actually, Dave K's Porsche 959 which is cleaning up in RAA GT handles like that, and everyone loves it.

    Comment


    • Tsrf

      You also can learn to drive within the "speed window" of the tires.
      That is what it will take. The more I drove it the better I was at completing laps. My goal is to have an easy to drive car which stays in the slot, not necessarily a speed demon. As of now, I have a bouncing speed demon.
      I need to get the body on it and apply weight to help settle it down a bit.

      Those Ortman tires are freaky in a sense they seem not be fazed by dust on the track compared to the S1's. Cleaning the Ortmans with tape didn't improve lap times. Do I need to lick them?

      Comment


      • I've found Ortmann's to be either good or too good as in having too much traction to cause chatter exiting a turn (which I switch to F1 P3's and all is fine for that particular car) (and lickin' them doesn't help much...though they do taste like chicken...). They do seem to work better on a dirty track though...seeing how most will be going with silicones - meaning a "clean" track surface which to me is the same as dirty - I'd go with Ortmann's over other "rubber" tires if I didn't want to use silicone.

        An update on my IMSA Corvette GT entry - so far my box-stock Fly race version Capri whoops its butt...sure'd hate to enter a plain ol' RTR...however, that's on plastic so I need to test on wood for a final verdict. Those Fly "D" tires are impressive

        Having Fun - Da Vols
        Last edited by Da Vols; 08-13-2006, 06:12 AM.

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        • GPR Cars in Progress

          I thought i would join the thread and post the progress on my GPR cars. Both are still in the ugly ducking stage, but comming along.

          Prototype:
          Car: Fly Porsche 908
          Motor: FK130SH
          Drivetrain: Slot-it axel, bushings and spur
          Tires: Rear are NSR supergrips on slot-it rims, fronts are monograms on stock rims
          Mods: Motor configuration has be modified to an anglewinder set up, front guide asseblely is from a 1/24 scale pan chassis.



          Body has the front aeros shaved off and is in the middle of being finished with my 'custom blue' for the GPR.




          GT
          Car: Monogram Greenwood Corvette
          Chassis is still in 'R&D' - has been converted to an inline from its stock front motor configuration, but still being worked on.
          Body: Sporting my 'custom blue' for the GPR, lookin pretty bad a@#



          Cheers

          Comment


          • Hey Brad,

            Cool looking cars! Is that a Porsche wheel on the front of the 'Vette? Cool!

            I've finally commenced work on my entries. My GT car is this Fly Porsche 911 Racing model.



            I'm a little concerned about the wheel size though.



            Looks like I'll have to get out the calipers and see how I'm doing for size here, eh Robert? I'll make sure I don my lead apron and gloves before I handle the highly radioactive Strontium (aka black plastic) wheels.

            The TSRF chassis is going on the back burner for a while. Too much fiddling and rebuilding of the front guide section to get the car to my liking. With my meagre chassis building skills, off-the-rack is what'll get my car on the track for testing. I've decided to HRS-ize my 936.





            This car has the same wheelbase as the Fly 908. With a bit of judicious dremelling I was able to get the HRS to fit underneath.

            Comment


            • Nicely done Porsche, triggerhappy - looking forward to seeing the Corvette's underpinings.

              DV - How does the Fly Porsche take to your track as is...wondering if those "D" tires like that kind of plastic.

              Er...not to be picky, but is that body configuration legal as it's a "rally" version which doesn't fit into the classes mentioned...

              Having Fun - Da Vols

              Comment


              • Hi DV,

                The early examples of the Porsche 911 Carrera were of the "ducktail" configuration.


                photo courtesy of racingsportscars.com

                This car pictured here raced LeMans in 1973 so the Fly Racing Porsche 911 meets the GPR eligibility requirement. The co-driver will not be present for competition in the GPR, though I'm sure the driver might like the company for the long haul around the world.

                I don't have a track built right now, so the 911 has been disassembled and the chassis is being detailed. My buddy Reckless Racer informs me that the car has very short gearing and maxes out very quickly on the straight. I may go Slot.it in the axle/gear/bushing area so I can really mess around with gear ratios. If the new Fly Rally motor lacks the necessary grunt, a NINCO NC should drop right in. I'll look at putting a larger pinion on the motor for starters, and see how it winds out once Raceworld Canada reopens with their new tracks. I'm curious to test out this NC style motor from Fly.

                I've been concentrating my efforts on the 936, as its body will need more work to finish properly.

                Comment


                • DV - I knew it'd be legal - heck there's seemingly a 911 variant of some kind that's been racing somewhere for near 4 decades now.

                  I set up a temporary long oval with a 12' straight and the Capri seems to have plenty of legs for that length...seems very NC-2-ish in overall speed, acceleration, and braking which ain't a bad thing.

                  Having Fun - Da Vols

                  Comment


                  • DV,

                    I like the NC can motors, especially the NC6. It's just within the GPR RPM limit and has plenty o' grunt. I can't wait to get these cars on a track! The Racing Capris are fast...that much I know. Low CG, wide, and light.

                    DV

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                    • Which exact motor is in the Fly Race Porsche? Is it the 22k/14.8v "EV0-2" (looks like an NC2), or the 26,750 RPM FK (Fox type)? Or another one altogether?

                      Is the chassis a flat plastic plate, or a floating motor pod? Inline I presume?

                      Comment


                      • The motor in the Fly Racing Porsche 911 is an 18k/14V NC can.



                        The motor is sitting in a suspended Evo 3 type pod. I'll check it out on Raceworld's track tomorrow.

                        Comment


                        • I'm pleased to say that the rubber finally hit the road at DrVanski Racing today:



                          Both of my cars got a shakedown run on Raceworld Canada's 8 lane track. The 936 (aka the Batmobile) ran mag free, and will continue to do so until I get it fully sorted.

                          There was no timing hooked up to the track as of yet, but both cars ran really well. The 911 seems to lack top speed and is geared more for acceleration. The Evo 3 setup makes for a smooth handling car without any tweaks at all!

                          The 936 is using a boxer HRS chassis and is also a smooth runner. Great brakes on that boxer in stock form. Both cars are running without lead for the time being.

                          Comment


                          • DV - I guess the motor & gearing is proper for the Porsche since it is a rally version. I'll assume on the Porsche that "no tweaks" means you ran it with the stock "D" tires?

                            If so, if I can't come up with a GT "scratcher" of some sort, I'm just going to stick a postage stamp on a Fly Capri and send it up North.

                            I'll have to give that HRS-Boxer setup a try for my next project - so far all 3 HRS versions I've used have been winners...though I haven't seen that much difference in handling between them.

                            Having Fun - Da Vols

                            Comment


                            • DV:
                              Originally posted by Da Vols
                              DV - I guess the motor & gearing is proper for the Porsche since it is a rally version. I'll assume on the Porsche that "no tweaks" means you ran it with the stock "D" tires?
                              Yes...totally stock. Better gearing and improving the float of the motor pod and body will hopefully yield better lap times.

                              Originally posted by Da Vols
                              If so, if I can't come up with a GT "scratcher" of some sort, I'm just going to stick a postage stamp on a Fly Capri and send it up North.
                              No shame in that, Bruce. GT class is production based so I'd say "go for it".

                              Originally posted by Da Vols
                              I'll have to give that HRS-Boxer setup a try for my next project - so far all 3 HRS versions I've used have been winners...though I haven't seen that much difference in handling between them.
                              I've yet to build an HRS sidewinder car. I find inlines or anglewinders better suited to my driving style...if I may be so bold as to call it that.

                              DV

                              Comment


                              • DV - Thank you kindly for the information - the Fly tires were my only concern, but they like Artin and that looks like flat latex on the track you ran so it seems like the Capri is very much a perfect RTR out of the box...can one really say that about a Fly with a straight face???

                                At worst, I'll pick up another race version and at least paint it up some...wonder if Iceman kept those Bordeaux's Butt Paste decals on file...

                                I like Pete's Gp 5 Fiat he just did up...my resin-bodied TS VW is an excellent handler with a HRS sidewinder underneath...hmmmmm...still got 90 days.

                                Having Fun - Da Vols

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