Are You Cracking Dba Rotors?

[Ant97GTR]

Mr Baron ....as stated before I'm after a set of slotted rear rotors for my 33GTR....do you know the part no for the Mu's as the 34's have a larger rotor....

[Beer Baron]

34s rears are the same as 33s. only 34 N1s have a larger rear rotor. could be wrong but pretty sure on that.

[Beer Baron]

actually it turns out I was wrong all this time. that part number is for the N1 sized rear rotors. 322X22mm. They don't make a 2 piece rear for any of the other models. sorry for the false hope.

endless do make them though. but they are quite a bit more expensive.

[Beer Baron]

the only rear project mu rotors you can get for a GTR with brembos and a 300X22mm rotor is the SCRN008. It's 1 piece, 8 slit SCR rotor. costs about $500 a pair plus shipping.

[Beer Baron]

still not a bad looking rotor:

[Angus Smart]

rear is standard and running Rda un slotted rotors, tho my friend milled some slots in them for me. they have not yet cracked and i'm running project mu max 500's pads

f50's on the front using race brakes/gav sport made front two piece rotor using an unknown disc that i was advised by race brakes to use, and i beleive i run level max 900's on the front with no signs of cracking yet. (tho it probably hasnt had much use)

i'm sure gav sport at st marys will make up a two piece rear set if you wanted. i beleive the fronts cost me around 1300 that was with hats made and rotor supplied.

surely there would be enough people after them..

Edited January 9, 2008 by Angus Smart

[djr81]

Yeah I was thinking that, in the absence of serious bling options, the <$300 RDA blandness looks to be a winner. Local mu secret lists them at $710 a pair plus postage, Nengun at about $630 delivered (Not listed, but similar sizes are about that - also I'm in WA so its probably cheaper for those of you living on the wrong side of the country)

Angus, out of interest how is the balance with the F50's up front & what master cylinder + front rotor you running? Sorry if I have asked before, but my memory is not what it used to be.

Edited January 9, 2008 by djr81

[Ant97GTR]

the only rear project mu rotors you can get for a GTR with brembos and a 300X22mm rotor is the SCRN008. It's 1 piece, 8 slit SCR rotor. costs about $500 a pair plus shipping.

Thanks Baron....I can't believe how difficult it is to get std sized decent slotted rotors for GTR's here in Oz!

[Roy]

I have the number of a guy that does a lot of Commodore setups using AP 4 pots on the rear with his own design hat and rotor. If someone is interested it may be worth chasing up. Uses a 320 x 22mm rear rotor, so you will need an N! Brembo caliper for the rear or a Biot style adaptor to run the 300mm R33 GTR Brembo caliper. But...can ask if its available with a 300x22mm rotor instead.

[Scooby]

We're bl**dy neglected here for choice. Check out Jap Yahoo! sometime and you'll see the massive range available to them; Dixcel 355mm Brembo and Alcon replacement rotors for $650, brackets to put just about anything on anything usually about $350, Biot and RDD stuff...the list goes on. Problem is you can't tell other than in a very basic sense exactly what they fit. I picked up a set of F50 calipers and 340mm two piece discs with brackets for $2100 landed. Problem is if I want to get replacement rotors or upgrade to 355mm discs I'm stuffed unless I go to 355mm GT-P DBA 5000s blanks (very similar offset) and get them drilled for the GTR.

As for the rears if I want to go bigger than the standard 300mm it's a pain because of the handbrake issue. I know places like Racebrakes and Gavsport have their own hats and rotors that gets made up by their mates, but I'm not sure I want to go down that path either - not the least reason for which is that they seem to want to charge like it's their first go at production when I know the dimensions are in a CNC somewhere and take bugger all time to make.

Bring on a local Biot / Dixcel etc distributor.

[Angus Smart]

Angus, out of interest how is the balance with the F50's up front & what master cylinder + front rotor you running? Sorry if I have asked before, but my memory is not what it used to be.

tell me how i'd find out this information about the master cylinder. after new rotors and pads on the rear the balance seems pretty good!

as for the front rotor custom made hats from Specialised Brake & Clutch Service and rotor unsure of brand..

from memory i think arond 340mm? perhaps a little more i can measure when i get home

[Angus Smart]

We're bl**dy neglected here for choice. Check out Jap Yahoo! sometime and you'll see the massive range available to them; Dixcel 355mm Brembo and Alcon replacement rotors for $650, brackets to put just about anything on anything usually about $350, Biot and RDD stuff...the list goes on. Problem is you can't tell other than in a very basic sense exactly what they fit. I picked up a set of F50 calipers and 340mm two piece discs with brackets for $2100 landed. Problem is if I want to get replacement rotors or upgrade to 355mm discs I'm stuffed unless I go to 355mm GT-P DBA 5000s blanks (very similar offset) and get them drilled for the GTR.

As for the rears if I want to go bigger than the standard 300mm it's a pain because of the handbrake issue. I know places like Racebrakes and Gavsport have their own hats and rotors that gets made up by their mates, but I'm not sure I want to go down that path either - not the least reason for which is that they seem to want to charge like it's their first go at production when I know the dimensions are in a CNC somewhere and take bugger all time to make.

Bring on a local Biot / Dixcel etc distributor.

I came across a problem with my rotors, was looking on yahoo to purchace new rotors as i my car came from japan with f50's on the front. the rotors were shagged, i went about trying to find out who made the kit and what rotor they used, but kept falling short, the hat bold sizes didnt compare to what the rotor bolt sizes were dixcel was looking the closest. the cheepest option was to get new hats made from specialised brake. the actual price wasnt too bad, $1300 for new rotors, and hats made.

these were the rotors and hats that came on the home. they are 10 bolt which seemed hard to find something that matches

Edited January 9, 2008 by Angus Smart

[Scooby]

Hi Angus,

They sure look good, but I think $1300 is a lot unless they needed to make everything from scratch which I suspect was the case. Redrilled - dare I say it - DBA 5000s are half the price, and I think Brembos are about $1500. The orginals you have look a lot like mine with a 10 bolt pattern. Brembo is 10 bolt also but I don't think Dixcel make a 340mm rotor and I'd bet our hats wouldn't match in other ways. Hence the problem.

Maybe the Beer Baron should become the Brake Baron?

Cheers

[Angus Smart]

Hi Angus,

They sure look good, but I think $1300 is a lot unless they needed to make everything from scratch which I suspect was the case. Redrilled - dare I say it - DBA 5000s are half the price, and I think Brembos are about $1500. The orginals you have look a lot like mine with a 10 bolt pattern. Brembo is 10 bolt also but I don't think Dixcel make a 340mm rotor and I'd bet our hats wouldn't match in other ways. Hence the problem.

Maybe the Beer Baron should become the Brake Baron?

Cheers

Yeah exactly the problem i had, i couldnt find a matching rotor from japan that was 10 bolt with the same rotor size, and i spent months and months searching.

And yes they had to make the hats, i gave them one of my old rotors+hat and they machined up a new hat to suit. i beleive the replacment cost for a new disc is about 200-300 each, and he also said that they dont wear out too quickly either.

i should try find out the brand name on the rotor itself but i beleive he said it was a locally made disc. not rda or dba tho??

[Scooby]

Yeah exactly the problem i had, i couldnt find a matching rotor from japan that was 10 bolt with the same rotor size, and i spent months and months searching.

And yes they had to make the hats, i gave them one of my old rotors+hat and they machined up a new hat to suit. i beleive the replacment cost for a new disc is about 200-300 each, and he also said that they dont wear out too quickly either.

i should try find out the brand name on the rotor itself but i beleive he said it was a locally made disc. not rda or dba tho??

isn't that funny, we both have the same discs and hats so we know they exist but can't find them! mumble f@rk mumble....

i'm surprised that neither DBA or RDA or Gavsport et al make aftermarket options for the GTR, particularly since the 32/33/34 are almost identical in terms of hubs etc apart from the M14 bolt size on the 34 and so many of us are bitching about the mega $ for AP and Brembo kits while desperately wanting bigger brakes. i reckon if someone came up with a kit to adapt the F50 and 355mm disc currently found on falcons to the GTR they'd do OK and make a big hole in the sales of some obscenely priced options.

Edited January 10, 2008 by Scooby

[Roy]

Disassemble the rotor and measure the overall diameter and then measure the PCD. If its 340mm then they are one of 3 manufacturers.

[Scooby]

yes, but do you know for sure which ones or how to communicate with them to order their gear? they seem to be the sticking points that Angus and I have encountered. i reckon it's either Biot, Rdd or Dixcel. Close?

Edited January 10, 2008 by Scooby

[Roy]

Here is the thing, Biot make 340mm, RDD make 343 and Dixcel only do std Brembo sizes such as 332 and 355. So like i said, if you measure them up then you are a chance. I have some catalogues etc for various japanese rotor manufacturers. You can also get a good indication of which brand of rotor it is based on the mounting hardware they are using.

[Sydneykid]

As I have said many times, I have no idea why some guys have so much problem with brakes on Skylines. We have never cracked a DBA rotor like you guys do, why do you think that is? Maybe we simply don't use the brakes as much because the difference between our corner speed and our straight line speed isn't as great. Perhaps because we have a strict running in regimine. Maybe it's because we have a controled cool down procedure to prevent hot spots. Or it's because we use lower temperature pads, so the rotors don't overheat. Ducting perhaps or heat shield removal.

Maybe you need to look at what you are doing that causes them to crack, rather than buying bigger and better (more expensive) rotors that might still crack anyway.

Cheers

Gary

[Roy]

Maybe it's because we have a controled cool down procedure to prevent hot spots.

LOL, dont discount whoever is drivng your cars actually knows how to brake

I cracked my near new 4000s doing a half mile run where i didnt get a chance to warm the brakes, and had to stop from god knows how quick, about 210km/h i think. And the runway didnt have a lot of run off space in the brakign area so you had to really jump on them to slow the car to a complete stop. Car had to do that 4 times with about a 45 min rest between runs....so i suspect thats what caused dramas for me. Here is the thing, my car is being used for these sorts of events more and more, and has different stresses on the car to the usual track work