thx247
10-12-2004, 11:23 AM
I ran config 13 counter clockwise at ButtonWillow a few days ago using a stock motor 240sx and suspension w/Azenis tires and 180sx brakes/Altima brakes.
I've had these 180 brakes for I'm not sure how many track days (over 10) and the pads were finally nearing the rivets (Carbotech rivets their pads for reasons I'll go into) on the backing plates. We estimated 1.5mm of depth in them to the rivet which should be enough for one more track day. Drove the event, and the next day the telltale of rotor grinding on pads was heard both front and rear.
I pulled the wheels and yep, we are hitting the rivets. What was interesting this time around was that the front brake rotor has tiny fissures or cracks in it everywhere. I've seen pictures of this before on rotors and apparently its nothing to be worried about unless there is a crack all the way through the rotor. These cracks never appeared until the pad was worn down sufficiently.
When a pad gets thinner apparently its operating temperature gets higher, how much higher I don't know. But it was apparently high enough to start cracking the rotor face. The depth of the pads is about 2mm where the rivet starts. I also managed to crack one of the pads through which if I had known I would have stopped driving- rivets or not.
Rear rotors were fine, however at an event prior I was overheating some Axis rear (Is there anything these pads do right?) pads after a couple of hotlaps so we had to ditch those for something else.
Whats this all mean? Basically with 180sx brakes and 140hp you can still exceed the limits of the stock brakes in certain conditions. Buttonwillow isn't even a really hard braking track in that configuration.
The setup I'm using now is a long way from the stuff I had for my first track day almost a year ago, so it was interesting to see the limits touched once again. 56k warning, big picts. (http://www.zilvia.net/f/showthread.php?t=37526)
Brake ducts are in the works now...
I've had these 180 brakes for I'm not sure how many track days (over 10) and the pads were finally nearing the rivets (Carbotech rivets their pads for reasons I'll go into) on the backing plates. We estimated 1.5mm of depth in them to the rivet which should be enough for one more track day. Drove the event, and the next day the telltale of rotor grinding on pads was heard both front and rear.
I pulled the wheels and yep, we are hitting the rivets. What was interesting this time around was that the front brake rotor has tiny fissures or cracks in it everywhere. I've seen pictures of this before on rotors and apparently its nothing to be worried about unless there is a crack all the way through the rotor. These cracks never appeared until the pad was worn down sufficiently.
When a pad gets thinner apparently its operating temperature gets higher, how much higher I don't know. But it was apparently high enough to start cracking the rotor face. The depth of the pads is about 2mm where the rivet starts. I also managed to crack one of the pads through which if I had known I would have stopped driving- rivets or not.
Rear rotors were fine, however at an event prior I was overheating some Axis rear (Is there anything these pads do right?) pads after a couple of hotlaps so we had to ditch those for something else.
Whats this all mean? Basically with 180sx brakes and 140hp you can still exceed the limits of the stock brakes in certain conditions. Buttonwillow isn't even a really hard braking track in that configuration.
The setup I'm using now is a long way from the stuff I had for my first track day almost a year ago, so it was interesting to see the limits touched once again. 56k warning, big picts. (http://www.zilvia.net/f/showthread.php?t=37526)
Brake ducts are in the works now...