grooved or drilled
29 December 2003, 10:15 PM
#2
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If the usual aftermarket cheap tat, then they are likely to crack through the drill holes if you use them as intended. I listened to the claims of the supplier who said they wouldn't crack and two lots later returned under warranty I received a refund and scratched heads as to why they had cracked. This was a commonly used brand of aftermarket discs.
You may fare better with grooved or just plain discs.
Notably, the Porsche discs are cast with the holes in they are not drilled afterwards.
You may fare better with grooved or just plain discs.
Notably, the Porsche discs are cast with the holes in they are not drilled afterwards.
30 December 2003, 07:12 AM
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Cast Porsche disks still crack slightly around the holes - it just doesn't get any worse is all 
Richard (who might actually have to change his disks for the first time in 18 months next season
)
Richard (who might actually have to change his disks for the first time in 18 months next season
)
30 December 2003, 10:47 AM
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I'm running DBA drill/groove discs on rear...no cracking at all with 400bhp (apart from std clutch cracking up under the strain!). I'd go just groove to be safe and for performance though as drill only gives cooling but takes away surface area - groove cleans pads...
30 December 2003, 02:40 PM
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And 6 pots on front. Front is area to look at most as it does most of the work. I've added cooling ducts to the rear brakes and it stops the discs going blue (this was before fitting DBA discs) - also worth a thought.
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