@Dales Cannon just continuing on from this. I'm pondering a tyre for the GTR for the odd dry weekend street run and for track work.
Do I:
1. Compromise and get a set of Nankang NS2R semi slicks. Or
2. Get a second set of OzRacing wheels with dedicated track tyres like a Nankang AR1 and Pilot Sport 5 street tyres on the OEM wheels?
Also what's your view on carbon ceramic brakes for a 1700kg car?
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Depends what gear you have available at the track. Most fast cars at the sprints run dedicated non road legal track tyres. Yoko A048, 50, 52 or slicks etc. Those that drive swap wheels and tyres at the track so have access to a trolley jack and carry tyres in the car or borrow trailer space. One Lotus drives on road tyres while his wife tows a trailer with slicks and spares. Big effort. I ran a track focused semi (Toyo R888R) and drove to, played and drove home on these but they are a compromise, maybe 0.5s slower than the Yokos above. This season I am running half worn AD08R and will replace them with something similar next year. I feel the 08s are as fast as the Toyos with the benefit of bags of grip if a dog pisses within 5km of the track.
We fitted AR-1 to the Fiesta but I can't give you a drive report because I haven't tracked it with those on it. However there are a few reports suggesting the AD09 and the Goodyear F1 (track oriented version) are better.
You are going to be putting a lot of load through the tyres so it comes down to whether you want maximum performance and change wheels at the track or it is for "my benefit" so 95% is good enough. For me I can change wheels at home on the hoist and drive to and from so it is a no brainer
Ceramic brakes are 100% the way to go. I would have replaced the M2 fronts for ceramics had I kept it. Just follow the rules and you will be fine.
PS5 are a very soft sidewall tyre. I don't think they will suit you even as a road tyre. You will need more pissies to overcome the lazy sidewalls. I run Yoko V107 for the road and so far (6,000km) they have been great. Very much a PS4S clone from Japan. Maybe 3dB quieter than the AD08R which got really noisy at half worn and probably 95% of the dry grip and double wet compared to the AD08 or 7,512% better wet grip than the Toyos.