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Originally Posted by porsche986spyder
You must be thinking in terms of thickness, I'm talking about overall diameter/circumferance.
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They can't. Look at the specs I posted earlier in this thread between the 'S' and the base model. The difference in diameter is less than an inch. The 'S' is also slightly thicker. Yet, the 'S' rotors won't fit on the base model with it's calipers. Also, Zimmerman is the OEM supplier to Porsche. For their aftermarket discs, they are essentially taking a solid OEM disc and drilling it - they're the same size. That's also why the 'S' and base have different model numbers.
Also consider this, even if you could do what you've stated, why would you? What would you gain? You've not increased the swept area because your pad size is the still same as a result of the calipers. You'd get no additional benefit - and actually lose some.
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Originally Posted by pecivil
so what I am hearing is that Porsche, Lambo, Ferrarri, etc put stock drilled rotors on just for looks, and a solid rotor is better.
I understand the logic as to why drilling has its problems, but I really hate to believe porsche puts drilled rotors on a GT-3 strictly for marketing, when solid is better.
Hummmmmm.....
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You're hearing correctly. Porsche (and Ferrari) are a couple of the best companies in the world when it comes to marketing/selling their product. They know their market and what it wants very well.
Just for reference, here's another good link that talks about brakes for those that are interested:
http://www.rennsportsystems.com/2c.html
From the link:
"Porsche used cross-drilled rotors with mixed success. The Zimmerman rotors used on the 930 Turbo brakes were very soft and crack prone, even though the holes were chamfered. The later Brembo rotors will also show some wear when used with most performance brake pads. Some of the best rotors in the world are made in Britain by AP and Alcon. Those rotors, when properly adapted, seem to be superior to the Brembo ones in terms of wear and crack resistance. All drilled rotors will crack sooner or later if overheated. Slotted rotors are more durable in this regard however they are heavier. One reason that most large iron rotors are cross-drilled is to save some unsprung weight. Since nice big, light, carbon rotors cost $1000 each, saving some weight without bankruptcy, is important. Plus, carbon rotors possess very little friction until they reach 500-600 degrees F. Porsche's PCCB ceramic matrix rotors while very light, seem to have mixed success when used for track events."
Hey, no worries...my car has cross-drilled rotors too.
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