[Mk2] [NA] Drilled Grooved Brake Discs

[Flyin Donkey]

I'm looking for some Drilled Discs..... anyone know of any places where I can get some & what price am I looking at?
A little advise from anyone who has some & any pics would be belting!
Cheers Very Much!

[Igor]

i have some, but i'm replacing them with standard ones. in my experience they warp very easely. i've got lots of brake judder now, and they still overheat far to easely and mine are vented and drilled!

if you want some here's a website that sells them:

http://www.fensport.co.uk/parts.htm

the fensport ones are different to the ones i've got by the looks of things so they might be better

[Hurstie1981]

Black Diamond and Red Dot also do them, but arent cheap...youre talking around £250 a pair.

[JeffD]

Dont want a debate but I just thought I would quote a couple of sections from the "Car Hacks & Mods for Dummmies" (I kid you not its a real book written by David Vespremi who owns an MR2 so its a pretty handy book ISBN 0-7645-7142-7 £14.99)

Anyway....

Page 138
Cross Drilling
Unless your using period-correct brake pads that release gasses when hot, cross drilled rotors dont improve performance.

Cross-drilled rotors were invented when brake pad compounds released gases when they were hot (a phenomenon called outgassing). The gas pressure actually pushed the pad away from the rotor surface. Cross drilling allowed a passage for the gasses to escapr. Modern brake compounds usually dont release gas under load, so you usually dont need cross-drilled brake rotors. Some high end car manufacturers have cast cross-drilled rotors alomg with painted calipers, but this is done more for marketing than because it improves performance.

If rotor holes actually are drilled instead of cast (this includes most cross drilled aftermarket rotors), the rotors are prone to cracks, and ultimately failure around the drill holes.

Slotted Rotors
A grooved or dimpled rotor surface may make brake pads less likely to glaze (crust over with burned material) under high heat. But these features are more of a marketing gimmick than a benefit ro the performance-minded enthusiast. They look cool, but grooves and dimples work like a cheese grater on the brake pads, wearing them more quickly than a smooth surface rotor.

If your rotors are glazing over, the culprit probably is your brake pad compound. You will be better served changing to a more aggressive pad compounds rated for a higher heat range.

Hope this helps and if your happy with standard pads I do em at 25% at www.flashmetal.com ;-')

Make your own mind up but I would save your cash! :-)

[Flyin Donkey]

cheers for the info guys, guess I'll have to bide my time and have a think about it

[JeffD]

Its a very good book btw. It covers all about turbos, exhausts the lot and although its meant to be a general book on tuning a lot of the examples are illustrated using the 3SGTE engine. Really good read and for £15 a brgain. :-)

[Scott Barton]

I have big red dot vented/drilled discs and also done the Brembo 4-pot caliper mod as well. Best upgrade i have done.
Not cheap though.

Moving to Modifications

[si2040]

I've just bought 4 off ebay with zinc plating and they so far seem to be fine! CRM are the guys and they can plate in in gold or silver! I just got groved and no venting as not needed as post shows as well!!