[jessrayo]

Originally Posted by ZL1-V

I'm not that concerned, I'll still enjoy the car with 20's or maybe 19's. Not trying to set any records anyway. Just need to reiterate that the kit has not been assembled yet to confirm that only 20" wheels can be used. I'm trying to clarify that you ran your car with 20" Toyo's and CF rotors and pads? What were the time differences between those and the steel rotors? How was the feeling of both?

I've run the car on 20" toyos and 19" hoosiers both with racing brake iron rotors. The car can corner and stop faster on the Hoosiers because the tires have more grip. Never with either tire did the iron rotor brake system ever fail to give 100% of the stopping power the tires could give. Basicially the antilock system is active with all braking at the limits, if the anti lock system is on then the only way you could stop faster is with more tire traction. In many other cars I have driven you can hardly get the ABS to come on at over 100mph because the brakes don't have the power to stop the inertia at the limitation of the tires. I'm fairly certain my ZL1 brake system could lock the tires at 200 mph. One time when I was getting strange ABS codes at the Texas mile I pulled the ABS fuse and locked up tires at over 170mph with surprising little pressure.

When you apply brake pressure the first thing the brakes have to do is slow the rotating mass of the wheels brakes and rotors.... then the tire bite stops the mass of the car. Reducing mass in the brake system will help the tires get into their grip limits sooner...that is not a problem with 6 piston calipers on the ZL1... when you put a racing pad under there it locks any tire you can fit under the car at will...

If you already have racing pads and fluid then Carbon brakes on the ZL1 should reduce stopping distances only by reducing mass. It would be nice to reduce the mass.... reducing mass is always good but the brakes are so good stock the only way to significantly improve the actual stopping distances is improving tire grip. The Z/28 can stop in less distance than the ZL1 mainly because the 19" Trofeo tires are better than the Goodyears.

I have never had Carbon brakes on my ZL1 but would still consider it to test longevity of the rotors. I'm a very big fan of Porterfield racing pads. I think they are a better cold pad than most "racing" pads and they are great hot. They can be driven on daily if you can stand some brake squeal when cold. The feel and stopping torque is phenomenal at any speed or temp.

Thanks for the post, I realize the product has not been released yet, but I would think that a company like racing brakes would be aware that people willing to spend over $10K on a brake upgrade are probably trying to make the car lap as fast as possible. With all the people I see running "track" tires to improve times, the brakes have to be able to work with the best tires if anyone is going to see any advantage from them. For now you have to be able to run "19s.