R32 N1 Discs - Non Drilled- Why

[NISMO]

Guys, anyone know why the R32 N1 GTR's would run standard looking non drilled rotors unlike the normal GTR's which ran drilled from factory?

Would there be any merit on running non drilled or slotted rotors?

[GTRsean]

Because they don't crack through the drilled holes like the stock pieces of s%$t.

When I bought mine it had N1 front and rear discs, they were great, no cracking.

Bought some nissan stock drilled discs and 6 months later they were cracking!!

N1 FTMFW!!

[Moodles2]

N1's were basic kit needed for teams to use them in racing, first things they probably did was dump the brakes for better ones.

[NISMO]

Because they don't crack through the drilled holes like the stock pieces of s%$t.

When I bought mine it had N1 front and rear discs, they were great, no cracking.

Bought some nissan stock drilled discs and 6 months later they were cracking!!

N1 FTMFW!!

:-)

Thought it might be something like that, but surprised they didn't design something different along the lines of slotted/drilled but without the issues.

I need new front discs and the genuine N1's would be impossible to find so am thinking of just popping in a set of RDA/DBA non drilled/slotted as thats what the car should have. Only prob is I do a few track days a year and if the slotted/drilled are much better for track work, might go with them?

[NISMO]

Moodles - I thought N1 racing was largely production based back then and things like brakes where non upgradeable. But not sure.

[scathing]

Slotted is OK for racing. Cross-drilled is not. If you have a look, few of the top-tier modern racing teams run drilled rotors.

Dominic Chen from Endless USA did a blog post ages ago. He took it offline due to perceived bias, but its been copied and posted here

Another demerit to the OE system is the fact that the rotors are cross-drilled. Putting aside the cross-drilled-rotors-have-a-tendency-to-crack debate, the issue with them is that they cool too quickly for track conditions. This is a fact that even Brembo themselves will tell you. With rotors that cool too quickly, you get erratic temperatures which cause rotors, both cross-drilled and slotted, to crack.

Also, the inability to maintain a good temperature means that you can potentially drop in and out of the ideal temperature range for whatever brake pad you’re using. The fact that the OE rotors are 2-piece floating allow for the rotor and bell housing to expand with heat, which is good, but the fact of the matter is that the surface of cross-drilled rotors is cooling too quickly.

[GTR-N1]

Obtained my DBA fish-hook slotted rotors with curved vanes (the latter, to dissipate heat) from UAS.

...same as some of the SuperV8 teams as Alan alluded to.

Cross-drilling under high heat renders the disc to cracking at the site of the hole.

This is due to uneven rates of expansion as heat builds juxtaposed to fast contraction in between braking.

Any slots that go to the edge of the disc are also prone to cracking at high heat.

So slots that are contained 'within' the perimeter are better.

[Duncan]

just grab the plain (non drilled or slotted) Bobby. That's exactly what i ran on the race car for years (from DBA) before they allowed us to go to 2 piece. they were fine (see avatar )