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Tyre testing at the "Combe"

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  • Tyre testing at the "Combe"

    In the absence of any news from Italy...., I thought I would do a little tyre testing at the Combe (GPR UK Track) to see how different makes performed and interacted with each other. Nuthin' to serious (Is that another of WCR's drivers....) but it passes the time between rounds...............

    I was very fortunate to be given some PPR tyres from Ace Hobby as my prize from last years RAA, (thanks Guy's, much appreciated), so it was a good opportunity to see how they worked on my track. These tyres are not really available in the UK, (to the best of my knowledge).

    OK The test Mule chosen was a Fly Lola T70, with the standard modifications I undertake to all my Fly Classic cars, Slot.it Spur gear, bearings, solid front axle, Slot.it deep wood guide, BWA O3 wheels on the front with Slot.it zero grips and BWA 05 wheels on the rear.

    I chose 4 tyres to test:- Ortmans, NSR Ultra grips, PPR, and standard Fly Classic. I should add my track is MDF with copper and a semi-gloss surface.

    All the tyres were mounted onto sets of BWA 05's and trued, (not glued as I normally do).

    Ortmans.....Not a very good fit on BWA wheels, high spots at the inner side of the tyre and not very round. However it is very easy to shape/true the tyre to the required profile.

    NSR Ultragrips...Good fit but tyre is concave. Truing results in the tyre "chunkin" ie. lumps falling off it!..Needs to be done in stages.

    PPR....I don't think these can be trued, but a fair fit. The corners need rounding for maximum performance, but how do you go about doing this.

    Fly Classic....Best Looking tyres and a fair shape but trueing needs to be done very slowly to avoid melting the tyre!.

    All the above tyres would benefit from glueing to the wheels.

    Now onto performance.....Each set of tyres ran for 50 laps in order to settle them in and for the driver to get used to their performance characteristics....

    Results.....Fly Classic....Fastest Lap.........4.63 seconds. Very smooth but lacks grip, lots of tail-out on the 180's.

    PPR.....Fastest Lap ....4.23 seconds...Very smooth ride but lack consistancy to lap at high speed. Much better grip when clean, and when warm. A good tyre choice for my track.

    NSR Ultragrip....Fastest Lap 4.20 seconds....Smooth ride and gripped well up to a point when they just lost grip completley. Performed better when clean and when warm. Very difficult tyre to drive on the limit.

    Ortmans....Fastest Lap....4.19....Harsh ride but consistant grip, easy to do consistant fast laps. No difference noticed between clean and dirty tyres, or hot and cold. Still my tyre of choice.

    As you can see, not a lot in it performance wise, (apart from the standard Fly's), Ortmans appear to have the edge but maybe that's just my driving style.

    The other thing I wanted to try out was how the NSR's and Ortman's reacted following running of the silicone PPR's......I'm happy to say no problems of lack of grip or altered performance characteristics were apparent, so PPR's are welcome at my track.

    OK Guys.....Let's race....

  • #2
    Cars to put tyres on

    Now if we only knew where are cars are all this tyres testing would be some advantage!

    Phil

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    • #3
      Interesting observations from The Combe there Alan, your results about what might be expected given my vicarious knowledge of your track conditions.

      PPR....I don't think these can be trued, but a fair fit. The corners need rounding for maximum performance, but how do you go about doing this.
      SuperTires - you can find some good information on these (often referred to as PPRs though they're only one distributor of the same product) at www.supertires.com seem to be inflexible in terms of stretching them over rims that they weren't designed for. But if, like me, you received a set of #1104s then they should fit the stock wheels of a Scalextric GT40 perfectly; the results may surprise you! (If your SuperTires are not #1104s and you own a GT40 let me know as I haven't found an application for my pair yet.)

      Once you get them on the wheel they're meant for, use drywall sanding paper, combined with brute force and ignorance, to get those shoulders rounded off. Also, cleanliness of the track is critical to these tyres.

      From interest, have you tried any of the Slot.it tires? I suspect that S1s or S2s might do quite well on your circuit. But realizing that your local inclination is toward the "rubber" compounds, it's worth noting how many cars are doing well on P3s both down under and in a couple of current proxy series.

      Comment


      • #4
        If you keep on tape or sticky-label cleaning those PPR's, they may outperform the Ortmanns. It took me about 125 laps to clean up a little-used lane the other day, running only two laps between rolling the rear tires over the Mongo pad (sticky label, about 5x7 inches). The Ortmanns are oblivious to dust, so they don't suffer at all when the track is super clean for the Super Tires.

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        • #5
          I'm "tire"d of waiting for traction

          Good job Alan.
          I've been leaning more towards Ortmans myself. The main reason is track maintenance. I can go out right now and rattle off fast laps with my Ortman tire cars. The silicones will be all over the track. When the track is "proxy race" clean, Ortmans and PPR's are close and even the 20x12 S1's will do great in a well set-up car.

          I've found using 400 grit wet/dry sandpaper and a bit of water really helps true the PPR's and keep the temps down to prevent smearing. The corners are a bearcat to get rounded. I'll have to try WCR's drywall paper method.

          NSR Ultragrips...Good fit but tyre is concave. Truing results in the tyre "chunkin" ie. lumps falling off it!..Needs to be done in stages
          What method did you use to true them? I tried to clean up the NSR's on my dupr 908/3 and they started to chunk also.

          Terry

          Comment


          • #6
            Originally posted by beejay7 View Post
            ...The other thing I wanted to try out was how the NSR's and Ortman's reacted following running of the silicone PPR's......I'm happy to say no problems of lack of grip or altered performance characteristics were apparent, so PPR's are welcome at my track.

            OK Guys.....Let's race....
            Interesting observation, Alan. I tested my Raceworld LMP1 car on The Coffin both before and after the Supertire shod RAA cars came through. My car was .2s quicker so the old wive's tale of silicon tires destroying tracks is somewhat overrated.

            Comment


            • #7
              Just a few more additional comments:-

              I'm sure my lack of experience with PPR tyres didn't help their results, and with the correct cleaning regime performance would have been on par with Ortmans. My only complaint against them is that constant cleaning of both the track and tyres is necessary. I don't have to do this at all with Ortmans and NSR's don't seem to mind an unclean track.

              The NSR's are strange tyres and I'm sure they should be run with the special solution sold by NSR, this softens the tyre and increases grip levels. I would not be happy doing this as it takes me back to the good old days of Goop on foam tyres...

              As far as trueing goes, I have found that the less you true Ortmans and NSR's the greater the grip levels. Obviously you have to get them true but I use these:-



              As sold by AB Slotsports. I just take off the highspots. round both edges of the tyres and then run them for a long time, to run the tyres in.

              I have tried both S1's and S2's in the past and neither performed very well. When I had Sport track the S1's were great, but on wood I found them poor. With the S2's I found them to be worse performers than the standard tyres supplied with Slot.it cars. This may well be due to the fact that my track is almost 100% Ortman based.

              I'll restate it, I would be more than happy to use Ortman, NSR or PPR tyres on any of my cars as I don't think there is a great deal of difference between any of them. My only concern is the cleaning issue, which puts me off PPR's a little.

              Regards

              Alan

              PS there are a lot of rumours in the UK regarding Ortman tyres. I understand there may well be a forced change in compound in the future, although this is only speculation at the moment.

              Comment

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