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Nankang AR-1 R Spec tyre review

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    Originally posted by trdee View Post

    Was doing my usual thing of aiming for 30psi hot and bleeding the tyres down across the day to suit as the track warmed up
    I've had a couple of sets now and found if you need them to last more than 5 laps then starting a few psi lower is the go. Will be a bit slower in the first few laps but come good after that.

    The best time i got out of mine was on lap 8 of a session.

    Depending on how long the sessions are should dictate hot pressure. In my car, 1550kg with me in it, i am for 34-36 hot for 10 min sessions and can push hard by the end of the first lap, on 15-20 min sessions i aim for 30-32 hot. Obviously your car is much lighter and require lower pressures than mine.

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      Originally posted by Sprinkles View Post

      I got my set from a shop in Artarmon if you are prepared to travel that far LMK and I’ll dig out the name of the place
      Keen to know! Cheers.
      "If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower." - Mark Donahue Penske Porsche 917

      "In Japan we no give fark for Subaru" - Trust Japan Technical Director
      (TM - AVENGE)

      "You can never have enough power. I remember when we had Group B cars... THEN we had enough power!"
      Juha Kankkunen - Rally of Argentina '02

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        So I got a set of AR-1 for the Jag.

        265/35ZR20 on a 9" wide rim
        305/30ZR20 on a 10.5" wide rim

        with a full tank of fuel and my fat arse behind the wheel it's gonna be ~1950kg...

        Will be 10 minute sessions

        Just wondering about pressures now, seems that 30-31PSI hot is the go for the lighter cars like the MX-5 and RX-7, but 34-36PSI hot for THE CHIEF in his 1550kg setup.

        1950kg would be higher pressures again?

        TBH I don't know shit about this stuff, the last time out on the PS4S I had them at 36PSI cold in the morning and refused to check pressures for the rest of the day because *ignorance is bliss*
        Jaguar XJR, Freelander 2 HSE, Jaguar XKR, MINI Cooper S
        Originally posted by nutttr
        People must assume you are some sort of drug dealer with all these nice cars turning up to a fibro home

        Comment


          Originally posted by Jack Nicholson View Post
          So I got a set of AR-1 for the Jag.

          265/35ZR20 on a 9" wide rim
          305/30ZR20 on a 10.5" wide rim

          with a full tank of fuel and my fat arse behind the wheel it's gonna be ~1950kg...

          Will be 10 minute sessions

          Just wondering about pressures now, seems that 30-31PSI hot is the go for the lighter cars like the MX-5 and RX-7, but 34-36PSI hot for THE CHIEF in his 1550kg setup.

          1950kg would be higher pressures again?

          TBH I don't know shit about this stuff, the last time out on the PS4S I had them at 36PSI cold in the morning and refused to check pressures for the rest of the day because *ignorance is bliss*
          Screenshot from nankang uk website.

          Comment


            I have found the AR1s to be excellent on my caged 1030Kg, 165 WHP, BMW2002 on the track running a hot pressure of 30 psi. I don't doubt the Yoko A050s are quicker, but it would be by less than 1 sec at Lakeside IMO. The AR1s are 205/50/15 on 7s. Five track days done and maybe 2 left in them. Best time 62.9 secs.

            On my lightly modded Renault Megane RS265, 235/40/18 on 8.25" rims, I have needed more like 35 Psi on the front to hold them up straight. The rear has 30 Psi. I have done 3 track days on them, rotating them, wear being much worse than the 2002. I now have two down to the canvas, and the other 2 will get another day out of them on the back. 62.4 secs at Lakeside. At around 1400 Kgs the Renault cannot brake as late or corner as well as my basically track 2002, but has 295 WHP to help it achieve a good time. The AR1s come on quite quickly, but the fronts on the Renault were overheating by the 5th lap on a warm winters day. I measured the tyre temp on the LHF at 110 degrees after a cool down lap. They are around 75 degrees on the BMW. One negative of the AR1s is the weight. They are massively heavy, and quite likely 2 Kg+ heavier than other semi slicks, although I have not weighed them.

            I expect I will buy the AR1s again, but might not bother taking the Renault to the track, given it is my road car.

            Comment


              I think we need a build thread on your 2002.
              Rust is lighter than carbon fibre.

              My Italian 510

              Comment


                Originally posted by THE CHIEF View Post
                Screenshot from nankang uk website.
                Thanks mate, so i guess i'll start them at 36PSI cold, see where they end up hot, probably need to be at the top end of that scale 40-42PSI...

                Originally posted by Alan M View Post
                One negative of the AR1s is the weight. They are massively heavy, and quite likely 2 Kg+ heavier than other semi slicks, although I have not weighed them.
                I weighed my two setups new AR-1's on OEM forged wheels vs well-worn PS4S on OEM cast wheels, seems that the forged wheels offset most of the added weight of the AR-1s.



                Bear in mind these are big wheels, big tyres... but in the end 100g heavier on the front, 600g heavier on the rear.

                Originally posted by Guido View Post
                I think we need a build thread on your 2002.
                This! Make it so.
                Jaguar XJR, Freelander 2 HSE, Jaguar XKR, MINI Cooper S
                Originally posted by nutttr
                People must assume you are some sort of drug dealer with all these nice cars turning up to a fibro home

                Comment


                  Originally posted by Guido View Post
                  I think we need a build thread on your 2002.
                  This might be the understatement of the century, I've literally been following this build my entire adult life.
                  Don't worry, thats just the self-preservation instinct, in my experience you can safely ignore it.

                  Comment


                    Originally posted by hotgemini View Post

                    This might be the understatement of the century, I've literally been following this build my entire adult life.
                    Yes Adam, I have had the '73 2002Tii (Round Tailight) since 1991, and have known your family since 1984. I will tell a bit of the story, as the whole thing would take many pages.

                    It was a leading "Club Car" (Improved Production) car in the '80s in Queensland, and as I was a Scrutineer for many years I had admired the BMW at the track, particularly because it was different. It was sold privately when the owner moved overseas, and I bought it from the next owner for $5500, with it looking quite sad in Ceylon (Bronze), with widened steel 13 x 7 wheels, a rare close ratio 235/5 Getrag box, and a custom made LSD using two bronze cones made in Brisbane. The engine had slide throttle injection with the original Kugelfischer pump, the engine had been in a open wheeler Renmax, before fitment to my car. To tune the Kugelfischer required the pump, like a diesel injector pump, to be stripped and a pear shaped mechanism that controlled the fuelling to be put in a lathe and machined to change the stroke on the pump at different throttle openings. Fairly difficult and specialised, with a lot of guesswork involved. I changed over to 45mm DCOEs with 39mm Venturi, which I knew more about, and was looking to reinstate it as a Club Car, but I needed to do a restoration first. At that stage it was making 125Hp at the wheels, and in the 64s at Lakeside.

                    I was driving it at a track day at Lakeside, still unrestored, where they had some game instructors that would sit in with you and give some pointers. I was coming onto the straight with, I think, Justin Wade in the car with me, and at 8000Rpm just before changing into 5th about halfway between the gate and the tower, the engine blew putting a fist sized hole out through the block at No.3 on the inlet side, putting aluminium swarf everywhere. The forged Venolia pistons had just done too many cycles, with the gudgeon pin splitting. The crank was bent, two valves bent, two rockers broken, and a piston relief mark in the head where the piston hit it. I think I reused the flywheel and the cam, the rest had done fair service or too broken, I thought.

                    Anyway, enough for now. Perhaps I will continue the story another day, away from the Nankang AR-1 thread.

                    Comment


                      I fail to see how weight is relevant whatsoever. If a tyre does 'x' laptime, who cares if it weighs 7kg or 9kg? Would you chose a lighter tyre that's slower?
                      As far as I can see, the only real things that matter about semi slicks are performance, life and cost.

                      Comment


                        Originally posted by THE CHIEF View Post
                        Depending on how long the sessions are should dictate hot pressure. In my car, 1550kg with me in it, i am for 34-36 hot for 10 min sessions and can push hard by the end of the first lap, on 15-20 min sessions i aim for 30-32 hot.
                        What's your logic behind different hot pressures?
                        Don't you think you should be aiming for the same hot pressure regardless? ie lower starting pressures for longer sessions, not lower hot pressures...

                        Comment


                          Originally posted by hrd View Post

                          What's your logic behind different hot pressures?
                          Don't you think you should be aiming for the same hot pressure regardless? ie lower starting pressures for longer sessions, not lower hot pressures...
                          I just re read what i wrote and can see that it doesn't make sense.

                          Yes should be aiming for the same hot pressure. What i meant to say is that on longer sessions when starting with lower pressures, the tyres won't be as quick for the first few laps but will be consistent once they get to their full pressure.

                          I think I confused myself because on the day i came up with that i had set lower pressures to see if I could go faster but the session ended up being longer than expected and i ended up at my normal 35-36psi. The net result was setting my best times toward the mid-end of the session.

                          Anyway, nice pick up. You owned me😉

                          What's your take on them, did you find they went greasy after 5 or so laps?

                          Comment


                            Our sprints up here normally only go for 5 flying laps, so can't really say after that.
                            I've always found their ultimate performance is in the first 3 laps for me. After that they drop off just a fraction. If I were smarter I'd back off after those 3 laps and cool everything off more before coming in. You'd probably get more life out of them that way. But when I'm on the track I always think I might be able to improve on that next lap... lol

                            Comment


                              I used to do the cool down thing but have now changed to your style of just trying to bang as many quick ones in as i can.

                              I still rate the Ar1 as unbeatable in bang for buck terms. Although the pricing is on an upward spiral and the gap is closing. I'm on my second set of these but contemplating on spending the big $ next time and trying a fresh set of A050 or Z221.

                              Comment


                                i landed another cheap set of V70s (which arent super old) but once those are used up ill try a set of 245/40/15 AR1s next. if nothing else, the extra tread should make me faster
                                1988 AW11 9A-GTE - project #1 | 1984 MA61 1JZ-GTE - project #2

                                Originally posted by Walt Kowalski talking like a crazed hobo
                                The major arrests will start from 1st January 2019.

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