Arv Mc Slow Posted July 21, 2015 Share Posted July 21, 2015 Since having my new set of ZZR's I've been advised to set them from 14 psi to 32psiReading the advice on the Avon website, I've decided to keep well away from the lower pressure, due to potential tyre wall damage, so my question, does anyone know a correct starting point for hot days sprinting, and possibly track days?cheers Arv Link to comment Share on other sites More sharing options...
Area Representative Andrew Gilbert Posted July 21, 2015 Area Representative Share Posted July 21, 2015 I'm running 18psi on mine and they were perfect at Snetterton on that. Link to comment Share on other sites More sharing options...
OliW Posted July 21, 2015 Share Posted July 21, 2015 17 cold for my super softs. I know some sprinters use 16 quite happily (and succesfully). Link to comment Share on other sites More sharing options...
Arv Mc Slow Posted July 22, 2015 Author Share Posted July 22, 2015 I was told that the low pressures mentioned above could damage the sidewalls Link to comment Share on other sites More sharing options...
OliW Posted July 22, 2015 Share Posted July 22, 2015 Where's that info then? (Just curious).My tyres are in their second season and look fine on the sidewalls. Link to comment Share on other sites More sharing options...
Simon.Rogers Posted July 22, 2015 Share Posted July 22, 2015 Most of us run that low or lower.Personally other than cross ply the I have always used 16psi cold. And yes I did once use ZZR's for one event and sold them at the same event! Never again!Kumho all the time formalist 1b However the Avon slicks are just fantastic. Just as progressive as the Kumho! Link to comment Share on other sites More sharing options...
Arv Mc Slow Posted July 24, 2015 Author Share Posted July 24, 2015 See second paragraphhttp://www.lotrdc.com/tyres-avon-zzr Link to comment Share on other sites More sharing options...
Arv Mc Slow Posted July 24, 2015 Author Share Posted July 24, 2015 http://www.lotrdc.com/tyres-avon-zzr Link to comment Share on other sites More sharing options...
AdC Posted July 24, 2015 Share Posted July 24, 2015 Is the individual cars' weight not relevant here? Am I right in thinking a car weighing 1200kgs, at, say, 17psi would be more likely to damage the tyre sidewalls than a car of 500kgs? Same goes for affecting the handling characteristics of the tyre?Mine are 17psi and seem fine (up from the 13-14psi of the old A048's) on a car weighing 475kgs with driver. Link to comment Share on other sites More sharing options...
2GBR Posted July 24, 2015 Share Posted July 24, 2015 I believe that when the carcass was changed is when the weight of the new ZZR as opposed to the earlier ZZR changed, And there was also a suggestion to run higher tyre pressures to maintain tyre shape to get the tyre working. For us in a 40 min race the earlier tyres road / race compound worked well around 21psi hot we now run at a much higher psi and is a much better tyre. Bearing in mind it takes our car with an average lap speed of 80mph 5 laps of a 3 mile circuit for the tyres to come up to their max temp and remain stable at that point. Sprinting wise with the softer compound surely running sub 17 psi the tyre footprint could go concave under side loadings and reduce adhesion, But what works for one could be totally different for another, But with a rumour of no more Kumho till christmas there could be more interest in the ZZR Link to comment Share on other sites More sharing options...
Arv Mc Slow Posted July 30, 2015 Author Share Posted July 30, 2015 27 psi today was dreadful, drifting into 4 wheel slides at relatively low speeds. down to 17 to see what that's like. Ho hum the unknown is a hitch. . Ps what's these khumo tyres like? especially for sprinting? Link to comment Share on other sites More sharing options...
Simon.Rogers Posted July 31, 2015 Share Posted July 31, 2015 Kumho Rules :-)And apart from that Arv you get to chat to Mel Williams to order them. Now thats worth the fee anyway.I will make sure I tell him your going to call so that he can prepare himself Make sure you sit down with coffee/beer and try to answer back!http://www.melwilliamstyres.com/ Link to comment Share on other sites More sharing options...
Drumster Posted July 31, 2015 Share Posted July 31, 2015 I'm not sure 'chat' is quite the right word more like 'strange experience' . It's the same with all these guys across the border Link to comment Share on other sites More sharing options...
2GBR Posted July 31, 2015 Share Posted July 31, 2015 Have you got the car set up correctly to run ZZRs they need plenty of Neg front and rear ? Are you using the soft compound for sprinting and road / race compound for road use ? Aim for 4/5 psi cold under your target pressure of 23/25 psi hot which you will not achive with road compound used for sprinting, but could if soft compound, ZZRs on sub 250 bhp Kumho on + 250 bhp works well Link to comment Share on other sites More sharing options...
2GBR Posted July 31, 2015 Share Posted July 31, 2015 Q is your car set up to run ZZRs ? They do need loads of neg camber front and rear, are you using soft compound for sprinting ? And road compound for road use ? Cold psi should elevate to + 4/5 psi when hot for road use, when sprinting poss 3/4 psi depending on loadings. My thoughts are ZZRs for up to 250bhp Kumho 250 + bhp Link to comment Share on other sites More sharing options...
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