Brake Discs - 8 or 16 grooves??

[Akinesis]

What would serve better on a track car - 8 or 16 grooves? Bearing in mind they will be drilled, too.

[walkinginperu]

Be careful with drilled disks, the holes are a stress raiser so if you get very high temps (which you will on track) they can crack and then shatter

[Akinesis]

Be careful with drilled disks, the holes are a stress raiser so if you get very high temps (which you will on track) they can crack and then shatter

So you would recommend going for grooved only??

[Throbbe]

tbh with modern pads you get very little gas generation so you just don't need drilled disks. I suspect Porsche still do it for weight loss/looks as much as braking performance.

Grooved will keep your pads clean, but so will braking like a real man.

I had a set of Carbotech pads on the legnum and had a long chat with the guy that makes them (mostly for the lancer Evo crowd). When I asked him what disks they worked best with for fast road use he told me to go with plain vented OE disks.

[hyperdrinky]

Also, using grooved/drilled disks will increase the wear on the pads. You'll go through them a lot quicker than using standard disks.

Sorry to sound like such a skinflint. Scottishness showing through.

[scalainj]

I much prefer plain vented and have used them with fast road pads on quite a few track days without any problem

Drilled discs crack under stress and i'm unconvinced on grooved. But i've just fitted a pair as hey have stopped doin plain in my size

[bluestreak56]

I have grooved and vented and theyre better than any other rocco ive driven!