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Originally Posted by Speedtoy
Correct..mostly. They are not a dedicated track pad, they are a hybrid that is a sane street pad, but has the capability to work at moderate track temperatures and stresses..its a give on the track side of performance for the benefit of street sanity.
There's no such thing as a perfect street pad that's also a perfect track pad. Too many tradeoffs, but IMHO, the R-4S is a pretty sweet place to be on the map if you need one that can do both within reason.
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I'm also a big fan of the Porterfields. I run the R4's (not the R4-S's) at the track in my StopTechs and love 'em.
However, I still switch over to the Axxis Ultimates for autocross. I've had nothing but good luck w/ the Ultimates for excellent cold grip, and they seem to be pretty gentle on the rotors. The Ultimates dust like crazy though... I had a set on my SVX and they're just too messy for the street. I've switched to the Metal Masters on that car and I'm 10 time happier.
What are the changes to the Axxis pads that are concerning people? I've been using 'em for about 4 years now and never had an issue.