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R33 Rda Slotted Rotors

08r3308
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_Ryan_ Grand Master

_Ryan_

Posted
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The slot not going to the edge is to prevent cracking, As I was told by Howard at Racebrakes in Melbourne.

RDA do make a coated rotor IIRC, but it wouldnt be too hard to paint the non-pad contacting area with a rust proof high temp paint.

siksII Grand Master

siksII

Posted
Posted

The last set of rotors I had on the front of my r33 were RDA slotted. Gave them a pretty hard time on the road and some track use.

Im always very careful with warming up / cooling down and had no issues with cracking. Overall very happy with the RDAs considering their low price from the group buy.

Just fitted a set of custom slotted DBA 4000s a couple of weeks back to replace them.

Here is a pic of when I took them off - well used ;)

post-2685-1254459704_thumb.jpg

GTR-N1 Grand Master

GTR-N1

Posted
Posted
The slot not going to the edge is to prevent cracking, As I was told by Howard at Racebrakes in Melbourne.

This is absolutely correct!

Analogy:- If you use a glasscutter and don't cut to the edge, it's still hard to snap. It cracks easily when the scoring is taken right up to the edge.

Example:- DBA had a run of complaints where there were short slots at the edge of the rotor showing cracks large & small.

08r3308 Mentor

08r3308

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The last set of rotors I had on the front of my r33 were RDA slotted. Gave them a pretty hard time on the road and some track use.

Im always very careful with warming up / cooling down and had no issues with cracking. Overall very happy with the RDAs considering their low price from the group buy.

Just fitted a set of custom slotted DBA 4000s a couple of weeks back to replace them.

Here is a pic of when I took them off - well used :P

those slots are gone

did you machine rotors at any stage or used pads that ate away the rotor?

how many kms roughly of use with your rdas?

ssxRicho Grand Master

ssxRicho

Posted
Posted

there is a HUGE lip on those rotors.

also, i taped up and painted my rda rotor hats black. autobarn brake caliper paint, newspaper and some tape. pretty easy.

these are my rears. (there is a lot of brake dust in the slots here, just after a track day)

th_rotors.jpg

siksII Grand Master

siksII

Posted
Posted
This is absolutely correct!

Analogy:- If you use a glasscutter and don't cut to the edge, it's still hard to snap. It cracks easily when the scoring is taken right up to the edge.

Example:- DBA had a run of complaints where there were short slots at the edge of the rotor showing cracks large & small.

DBA still makes their slotted 4000 series with those slots at the edge for 296mm rotors. This is why the rotors I purchased to replace my RDA's were blank 4000s into which I got custom slots machined in that do not reach the edge.

those slots are gone

did you machine rotors at any stage or used pads that ate away the rotor?

how many kms roughly of use with your rdas?

Machined them once which actually took away approx 1mm or 50% of the rotors life. I had an incident where my pad disintegrated and the backing plate ate the rotor a little - hence the machining. The other 50% of wear was from the pads.

Not sure of exact kms off the top of my head but it would be ~25,000.

GTR-N1 Grand Master

GTR-N1

Posted
Posted
DBA still makes their slotted 4000 series with those slots at the edge for 296mm rotors. This is why the rotors I purchased to replace my RDA's were blank 4000s into which I got custom slots machined in that do not reach the edge.

^^^Very wise!

My DBAs have fish-hook slots that go nowhere near the edge + curved vanes.

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