I know it's an older thread, but I wanted to add a data point.
I eventually wore out the Stoptech rotors. At the time I was short on money so I bought the cheap Centrics from Rockauto. Honestly I think the only difference is that the Stoptechs have a powdercoated hat, which I didn't like anyway since it melted and peeled off and made a mess. The Centrics are laughably cheap (like under $20 each) and they hold up to endurance racing just fine.
BTW if you don't buy cheap organic pads most modern pads to not give off much or any gas when heated. Slotted rotors are not needed. None of the competitive teams in Lemons use anything but blanks. Drilled rotors are a bad idea, they crack at each of the holes and they go through pads like no one's business. They have less thermal mass and less surface area touching the pads. I know they look sexy, but don't waste your money.
One other thing I wanted to mention here for posterity. Balance front to rear is important. I first upgraded our fronts to the CL knuckles and rotors. At that race we cooked our Porterfield front pads and had some scary rear end instability under braking. My brake points moved back about 50' because it was too easy to lock up the fronts. The fronts were doing all the work and it made everything worse. For the next race I upgraded the rears to the CL knuckles and brakes. Problem solved.
I eventually wore out the Stoptech rotors. At the time I was short on money so I bought the cheap Centrics from Rockauto. Honestly I think the only difference is that the Stoptechs have a powdercoated hat, which I didn't like anyway since it melted and peeled off and made a mess. The Centrics are laughably cheap (like under $20 each) and they hold up to endurance racing just fine.
BTW if you don't buy cheap organic pads most modern pads to not give off much or any gas when heated. Slotted rotors are not needed. None of the competitive teams in Lemons use anything but blanks. Drilled rotors are a bad idea, they crack at each of the holes and they go through pads like no one's business. They have less thermal mass and less surface area touching the pads. I know they look sexy, but don't waste your money.
One other thing I wanted to mention here for posterity. Balance front to rear is important. I first upgraded our fronts to the CL knuckles and rotors. At that race we cooked our Porterfield front pads and had some scary rear end instability under braking. My brake points moved back about 50' because it was too easy to lock up the fronts. The fronts were doing all the work and it made everything worse. For the next race I upgraded the rears to the CL knuckles and brakes. Problem solved.
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