[GrandSport]

Originally Posted by Icecreamtruk

Anywhere from 3k to 5k long, the difference is around 3 to 4 secs, depending on how twisty the track is, at least for our cars is, maybe that changes when the weight/power ratio changes drastically. Unless we are talking about little 1k to 2k tracks that are around 1min lap, there it is around 2s per lap, but there arent many tracks like that down there, are there?

ya, obviously the car, what street tire and what slick you're going to. In my case it was a good street tire (Super Sport). Obviously if you're going from an 80k mile hard economy tire to a michelin soft on a super technical track that is very long, it will be more than 2s. Kind of related: Strangely, I have very similar lap times with R888R and MPSS (ZP). MPSS get greasy and lose traction much faster and cost a lot more though. R888R are 40mm wider in front too.

Typical call it 2.4 mile-ish track going from a street tire you'd do a track day on (R888R, NT01, MPSS, etc) to a Slick/semi/cheater slick you'd do a track day on. I'm not trying to go from one extreme to another extreme.

Originally Posted by CSG Mike

I'd bet there's a strong correlation for the tire preference with driver skill. A more experienced/skilled/confident driver would take the shock that enables them to exploit their skill, rather than go the "safe" known of a stickier tire.

I'm not sure about that. I think virtually every driver would take slicks every single time. I'd be really surprised if one coilover system to another resulted in 2 second difference in lap time, assuming both are setup right. Suspension as a whole (geometry, spring rates, shocks, etc) can do a lot, but just one shock brand to another? Eh.