Originally Posted by PhoenixLexi300
I've been looking at carbotech xp12 pads or project Mu pads. Rated for up to 800 deg Celsius.
Rotors I need some capable of handling the heat, best ones I found are good to 600c --Project mu club racer.
Anyone heard anything about these? Or have a recommendation?
You need pads to handle the heat, and rotors to shed the heat in between stops. The DBA design is slightly higher temp AFAIK
then Project Mu Club racer and likely has cooling similar to the Project Mu SCR Pro type rotors based on internal fin design. There should be other equivalents on the market....
The best bias set up that I've had on my car was the Figs adapters, Supra TT rotors (DBA), and Hawk pads (keep forgetting that I have this in my garage should anyone want a good deal for a xmas present). From highway speeds it was slam me in my seat belt good and felt good in rain, or other poor conditions. For lower speed track days, I would have ran with this for as long as I could have.
I switched to 4 pistons because I wanted a more aggressive/higher temp capable pad with some street manners for over 600whp+. The Hawk pads are under 1000° before serious fade issues occur vs. <1500-1600° on what I have now. I'm confident I could stop down from 150+mph if needed, but the trade-off is brake bias. I can lock up the fronts before the rears which won't translate into shorter stopping distance in most situations. Situations where pads end up over 1000° it sure will stop better, but otherwise.... I doubt it.
On a pure numbers side... at one point, I built myself some calculators and looked at friction factor of all the pads I could find, and various brake options/diameters/etc. for the IS. The brake bias is borderline horrendous with 4 pistons up front on a large diameter rotor and an aggressive pad... while keeping stock diameter and calipers in the rear. Most internet wisdom will say 'stopping power comes from the front, my 4 pistons are awesome, and don't even touch the rear brakes'. But, I'm glad to see guys like Hardvin chiming in stating some actual truth that BBKs can ruin the bias and make things worse.
Personally, I think guys should be looking into rear brake upgrade options when doing 4 pistons on the IS. The options coming out for larger diameter rotors and 6 piston calipers front with larger diameter rotors and 4 piston rears merit more research... just as would some kind of rear brake upgrade to match 4 pistons now.
Some other reading/real world thoughts for you...
Brake Myth #1
Was watching a vid on tuned that made me think of this thread. 4 minutes in you can hear the fantastic race pad squeal. Even listen to the pro drivers comments after the lap test about too much brake up front, etc.