Thread: Slotted Disc Rotors?

Originally Posted by discowhite

less surface area, yes, wouldnt be more than 10% of the total area though, and the less breaking power quote is most likley nullified by the increase in brake preformance you get from having said slots

how fast do LR's go?? not as fast as a push or lambo so they probably dont need ceramic disc's either

cheers phil

Where I notice the reduced surface problem is when moving slowly or when stopped on the side of a steep hill where there doesn't need to be heat dissipation etc. This was more so with the EBC slotted and dimpled rotors. The DBA with just the slots is a better setup and they still clear the pads.

Originally Posted by discowhite

most likley nullified by the increase in brake preformance you get from having said slotsl

hrmmm....no sir, I don't agree.

And if it is nullified, then the positive is, they look good. So yeah, do it for the looks.

....further more, if you are going for a more aggressive disc AND pad, then you want them to get hot. No heat, no brakes...you also want them to cool faster when not used.

The gas dissipation under normal braking conditions is minuscule rendering the grooves......nice to look at.

If, however, you intend on hitting 220 down the straight of EC and taking that first left at 170, then you will be glad your slots not only look good, but serve a purpose


edit: If Slunnie states there is indeed a difference, then go with that. He has an extensive history of racing and a thorough understanding of all things automotive. It had to be said, Simon

Originally Posted by catch-22

....further more, if you are going for a more aggressive disc AND pad, then you want them to get hot. No heat, no brakes...you also want them to cool faster when not used.

The gas dissipation under normal braking conditions is minuscule rendering the grooves......nice to look at.

If, however, you intend on hitting 220 down the straight of EC and taking that first left at 170, then you will be glad your slots not only look good, but serve a purpose


edit: If Slunnie states there is indeed a difference, then go with that. He has an extensive history of racing and a thorough understanding of all things automotive. It had to be said, Simon

so what your saying is that is if slunnie says it ok then nobody else has the right to give an opinion? what about mikes comment? dosnt count either?
you dont even have the faintest idea of my background either do you?

Originally Posted by discowhite

so what your saying is that is if slunnie says it ok then nobody else has the right to give an opinion? what about mikes comment? dosnt count either?
you dont even have the faintest idea of my background either do you?

I didn't agree with Simon. Just pointed out that he had noticed a difference with the grooved rotors.

nobody else has the right to an opinion?? where'd I say that? It's a ****ing forum. It's designed for people to give opinions...

yes I have a faint idea......

anything else?

Thanks Catch-22, you've had way more time at the track than me over recent times. As you know, it does bring a degree of sensitivity of the little things that happen.

Phil, in my opinion I think most of what has been said in this thread by you, Mike, Catch-22, myself and others is correct.

In a 4WD application I think that an ideal rotor is something like the dba 4000 series wiper which just has minimal slotting to clear the pad but to still maximise pad contact area with the rotor. I think the value of running a slotted and dimpled or X-drilled rotor would be if you were running cheapo pads that overheat quickly and outgas in the process - but I think there is better value in running a better pad compound with higher friction coefficients and maximum temps with plain rotors. I think there is more in the pads than in the rotors.

Originally Posted by Slunnie

Thanks Catch-22, you've had way more time at the track than me over recent times. As you know, it does bring a degree of sensitivity of the little things that happen.

Phil, in my opinion I think most of what has been said in this thread by you, Mike, Catch-22, myself and others is correct.

In a 4WD application I think that an ideal rotor is something like the dba 4000 series wiper which just has minimal slotting to clear the pad but to still maximise pad contact area with the rotor. I think the value of running a slotted and dimpled or X-drilled rotor would be if you were running cheapo pads that overheat quickly and outgas in the process - but I think there is better value in running a better pad compound with higher friction coefficients and maximum temps with plain rotors. I think there is more in the pads than in the rotors.

So what pads do you recommend? Bendix for 4x4?

Only Pussies lift off at turn 1 EC.
Ive never had fade issues when off roading. You guys need to use more engine breaking or drive slower.