Tex Posted December 6, 2021 Report Share Posted December 6, 2021 At a very wet Donington today and not for the first time I realised just how poor Cup 2’s can be on track. No heat can be generated and the tread pattern can not cope with the wet. So what tyres are being used for road/ track in less than ideal conditions ? I have previously considered PS4S but can’t get them close to the front size of 215/45/17 and rears would need to be 295/30/18 as not available in 285’s Thoughts welcome 1 Quote Link to comment Share on other sites More sharing options...
Bravo73 Posted December 6, 2021 Report Share Posted December 6, 2021 Don’t the PS4 come in Exige sizes? Quote Link to comment Share on other sites More sharing options...
Rooge Posted December 6, 2021 Report Share Posted December 6, 2021 I went for eagle f1’s Quote Link to comment Share on other sites More sharing options...
Tex Posted December 6, 2021 Author Report Share Posted December 6, 2021 2 hours ago, Bravo73 said: Don’t the PS4 come in Exige sizes? Not sure they do, I know PS4S don’t but will check on the PS4 46 minutes ago, Rooge said: I went for eagle f1’s What sizes ? Quote Link to comment Share on other sites More sharing options...
Rooge Posted December 6, 2021 Report Share Posted December 6, 2021 215/45 285/30 Quote Link to comment Share on other sites More sharing options...
Tex Posted December 6, 2021 Author Report Share Posted December 6, 2021 Cheers, Looking online could not see the 285’s , where did you get them ? Quote Link to comment Share on other sites More sharing options...
Rooge Posted December 7, 2021 Report Share Posted December 7, 2021 Sorry my mistake the cup 2s are 285 and 275 for the Goodyear Quote Link to comment Share on other sites More sharing options...
Tex Posted December 7, 2021 Author Report Share Posted December 7, 2021 Potential solution is to go for PS4 in OEM size 215/45/17 on the front and up a size on the back to 295/30/18 on rears with PS4S. Issue then is mixing different tyre compounds, although not huge difference in PS4 to PS4S and changing the rear height/Geo which may not be a great idea Quote Link to comment Share on other sites More sharing options...
Markymark Posted December 7, 2021 Report Share Posted December 7, 2021 I believe PS4S are similar to the old Supersport and have a better , higher performance, carcass design than the PS4 Quote Link to comment Share on other sites More sharing options...
Bibs Posted December 7, 2021 Report Share Posted December 7, 2021 Our resident tyre guru @rallyesax may be able to help Quote 88 Esprit NA, 89 Esprit Turbo SE, Evora, Evora S, Evora IPS, Evora S IPS, Evora S IPS SR, Evora 400, Elise S1, Elise S1 111s, Evora GT410 Sport Evora NA For forum issues, please contact the Moderators. I will aim to respond to emails/PM's Mon-Fri 9-6 GMT. Link to comment Share on other sites More sharing options...
rallyesax Posted December 7, 2021 Report Share Posted December 7, 2021 This post was recognized by Bibs! rallyesax was awarded the badge 'Superstar' Mixing PS4 and PS4S on track is not the way to go. It could be OK for road use but not perfect. Either go full PS4 or full PS4S for wet weather trackdays, they both perform really great in this conditions. Cup 2 is a clear dry trackday Tyre, no doubt about that. 1 Quote Link to comment Share on other sites More sharing options...
Tex Posted December 7, 2021 Author Report Share Posted December 7, 2021 Yes that would be the best solution but not possible as they don’t do the correct sizes Quote Link to comment Share on other sites More sharing options...
rallyesax Posted December 7, 2021 Report Share Posted December 7, 2021 If you aim at wet trackdays go for the Exige 350 sizes in PS4 if you want to stick with Michelin. I don't know in the UK, but for trackday use only, you can go for a different Tyre size than the homologated one. Quote Link to comment Share on other sites More sharing options...
Tex Posted December 7, 2021 Author Report Share Posted December 7, 2021 Different size wheels etc on the 430 and 410’s Quote Link to comment Share on other sites More sharing options...
Exx Posted December 8, 2021 Report Share Posted December 8, 2021 PS4, available in our sizes Quote Link to comment Share on other sites More sharing options...
Tex Posted December 8, 2021 Author Report Share Posted December 8, 2021 No PS4S or PS4 in 285/30/18 available in UK Quote Link to comment Share on other sites More sharing options...
Exx Posted December 8, 2021 Report Share Posted December 8, 2021 Yes but they do exist in 265/35 which is OEM for 350 And it will be enough for wet days I ran them on wet track on mine and it was really good, far better than Cup 2 (i have 295/30/18 Cup 2 now with 4mm spacers) If you want to stick to Cup 2 you can try the new "Connect" they are supposed better in rain Quote Link to comment Share on other sites More sharing options...
rallyesax Posted December 8, 2021 Report Share Posted December 8, 2021 I know, tyre sizes and rims are different between 350s and 410/430s but as @Exx mentionned, you can definitely run 265 PS4 on your car. You can run a 265 tyre on a 9" up to 10.5" inch (Width) rim and stay in the ETRTO legal definitions. 350s rims are 9.5J18 whereas 430s are 10J18 Same for the Front with the 205 vs 215, both on 7.5J17 rims This, only for wet trackday purpose, as this tyre size is not homologated on your car. 1 Quote Link to comment Share on other sites More sharing options...
Tex Posted December 8, 2021 Author Report Share Posted December 8, 2021 2 hours ago, Exx said: Yes but they do exist in 265/35 which is OEM for 350 And it will be enough for wet days I ran them on wet track on mine and it was really good, far better than Cup 2 (i have 295/30/18 Cup 2 now with 4mm spacers) If you want to stick to Cup 2 you can try the new "Connect" they are supposed better in rain Yes connect are better although I have 2 sets of wheels and would like to run a wet road / track tyre on one set and Cup 2’s on the other for dry track Interesting you are running 295 rears, no issues I presume. Also Are your spacers aftermarket ? Cup 430’s run Spacers as OEM Quote Link to comment Share on other sites More sharing options...
Tex Posted December 8, 2021 Author Report Share Posted December 8, 2021 22 hours ago, rallyesax said: Mixing PS4 and PS4S on track is not the way to go. It could be OK for road use but not perfect. Either go full PS4 or full PS4S for wet weather trackdays, they both perform really great in this conditions. Cup 2 is a clear dry trackday Tyre, no doubt about that. So Is the mixing with PS4S rear and PS4 fronts a real no no ? Presumably the grip levels and the temps they perform at is different and this i imagine would be an issue ? As stated before the only solution to using Michelins is to mix them unless I go down tyre width, which I would prefer not to do. Quote Link to comment Share on other sites More sharing options...
Exx Posted December 8, 2021 Report Share Posted December 8, 2021 Yes custom made Quote Link to comment Share on other sites More sharing options...
Gold FFM Paul_D Posted December 8, 2021 Gold FFM Report Share Posted December 8, 2021 1 hour ago, Tex said: So Is the mixing with PS4S rear and PS4 fronts a real no no ? Presumably the grip levels and the temps they perform at is different and this i imagine would be an issue ? As stated before the only solution to using Michelins is to mix them unless I go down tyre width, which I would prefer not to do. This is worth a watch. Having watched that I think having PS4 one end and PS4S the other could result in some interesting handling. And a complete change of balance from wet to dry or hot to cold. 1 Quote Link to comment Share on other sites More sharing options...
Popular Post rallyesax Posted December 8, 2021 Popular Post Report Share Posted December 8, 2021 It's not a complete no go but could result in an unbalanced car. Tread compounds material is N°1 factor for wet performance, and they are not the same on PS4 and 4S (both being really good on wet it's a bit less of a matter but still). As you mentionned, their thermal state performance is not the same. If it's a warm wet day, it should be OK but on a cold wet trackday, you'll figure out 😁. The tread depth is not the same, on standing water it could result in U/S or O/S at steady state or under transient maneuvers. Then, cornering forces will take more time to build up between FR and RR axle as lateral rigidity are different (you could almost not feel it or end up with a sensible delay in steering response) That's for the quick answer 😅 4 Quote Link to comment Share on other sites More sharing options...
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