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Old 03-28-2005, 08:09 AM   #11
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Quote:
Originally Posted by willwren
Betcha 10 bucks that GTP will stop better without the holes. It'* the slots that improve braking power, holes are for cooling, but only in extreme braking conditions. And they're replaced after every race.

Slots allow the pad gasses to escape. You don't get the 'air hockey' effect between the pad and rotor. They do the same for shedding water as well. My slotted rotors gave me the same effect as you describe.
Maybe it would stop better without the holes, I'm not saying it wouldn't, but I'm not saying it would either. However, it stops A LOT better than it did with the regular rotors on it, and looks a lot cooler. I have never liked what slotted rotors looked like. The drilled and slotted look really good IMO and it stops a lot better than it did without them, and fade is pretty much non-existant. GTP brakes are A LOT worse than Bonneville brakes, and then when you put Grand Am brakes on the front (significantly lighter), they become even worse. It had brake fade so horrible if you tried to slow down at a normal rate from 80mph to 0 when you got down to around 30 or so there would be basically no braking power, it doesn't do that at all now, and I highly doubt its the slots that got rid of that...but I could be wrong.

Shawn
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Old 03-28-2005, 11:12 AM   #12
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One neat thing I noticed with mine, not only is fade much improved, it'* so non-existent, they actually bite HARDER the hotter they get, all the way to a complete stop.

Shawn, the holes help with cooling, but reduce your braking surface. If you went bigger, I'm not surprised you saw an improvement. Just saying if you took out the holes, it would be better still.
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Old 03-28-2005, 01:12 PM   #13
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Drilling your own rotors yourself is about as smart as drilling 1/2" holes in the body for weight reduction mod.
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Old 03-28-2005, 09:02 PM   #14
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Mr. Blunt strikes again! He'* right. But it doesn't hurt to ask. I'm glad this question pops up from time to time, rather than people trying it from time to time.
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Old 03-28-2005, 09:39 PM   #15
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you'd ruin enough bits going through two rotors to pay for a drill bit sharpener or four
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Old 03-28-2005, 11:09 PM   #16
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Quote:
Originally Posted by John Deere Boy
you'd ruin enough bits going through two rotors to pay for a drill bit sharpener or four
p

I was gonna mention that. All brake rotors are hardened a lot, premium ones HEAVILY. After plopping $17 for a 1/2" hardened bit to do my ball joints, i don't even want to think about that one.
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Old 03-28-2005, 11:11 PM   #17
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Wire EDM would be the only feasible method.
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Old 03-28-2005, 11:13 PM   #18
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Maybe a waterjet... But as we've stated, it'* HIGHLY unsafe.
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