Here’s a comparison of DBA (http://www.dba.com.au) versus GiroDisc (http://www.girodisc.com/) 2-piece disc brake rotors for the 350z Track Model based on the web searching I’ve been doing. This is not a “hands-on” comparison (i.e. I haven’t used either). Feel free to add new information/corrections to this thread, especially about other brands of 2-piece rotors for the Track 350z.

On Stillen.com and brake-pros.com, DBA 2-piece disc fronts for the Track 350z are $695 for the pair. I can’t find a DBA 2-piece for the rear. Doesn’t look like they’re available. On 350evo.com, I found DBA replacement rotors for the 2-piece at $300 for the pair. The replacement rotors do not appear to include new hardware (bolts, etc.). So far, I haven’t figured out if the hardware can be safely reused.

On 350zmotoring.com, MSRP for the GiroDisc 2-piece is quoted as $450 per disc, front and back. So that’s $900 a pair. Replacement discs are $225 per disc and that includes hardware, or $450 a pair. I haven’t actually found any distributors for GiroDisc yet. It’s not clear if resellers would go much lower than the MSRP, but I hope so!

See: http://www.350zmotoring.com/forums/s...light=girodisc


I can’t find specs on the weight of the DBA discs, but GiroDisc saves 4 lbs over OEM front rotors and 4.5 pounds over rear rotors. I would guess that DBA shaves at least a couple pounds per rotor since the hats are aluminum just like GiroDisc. I can’t find any info on which discs move more air (i.e. run cooler). Also, I don’t know which company has a higher quality casting process for their rotors. Another thing, I don’t know how many miles to expect from either brand before needing replacing. However, my stock Brembo rotors are basically gone with 23k on them, taking two years to get there (no racing).

DBA 2-piece rotors would actually be somewhat cost effective long term as the replacement rotors are cheaper than other high quality one-piece rotors available for the Track 350z. That’s not the case for the GiroDiscs (if going by MSRP). The only advantage GiroDisc seems to have is that they offer 2-piece rears. Otherwise, GiroDisc 2-piece rotors are much more expensive.

Another thing to consider if you go with either company is how long will they be in business? If you get two-piece rotors, obviously you need them in business long enough to buy replacement rotors when you need them over the next few years. DBA is from Australia and appears to have several distributors in USA already. It looks like DBA has been in business since at least 1996. I can’t find any distributors for Girodisc, and I can’t figure out how long they’ve been in business. However, their resume looks pretty solid, at least from an engineering standpoint.

BTW, If you do get two-piece rotors and you do any sort of organized amateur racing, you should check to see if two-piece rotors are allowed for your class.

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Jeff

 

Wow, I wish I had included the StopTech 2-piece rotors for the Track Z in my write-up. They look very promising so long as the price on replacement rotors is not too bad.

Check out this thread: https://my350z.com/forum/showthread....threadid=89662

And this link:
http://www.stoptech.com/press_releas...drkrelease.htm


“The AeroRotor® DRK is 2.5 pounds lighter per front rotor assembly and more than 2.75 pounds lighter per rear rotor than the stock rotors, creating a total reduction of 10.5 lbs total weight savings versus the stock rotors.

Retail prices for the 350Z AeroRotor® DRKs are:
Slotted-Front $584.00
Slotted-Rear $736.00
Drilled-Front $684.00
Drilled-Rear $836.00”



Anyone know the price on the replacement rotors?

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Jeff

 

Don't forget that the DBA rotors use Pillar Vane Technology which cools much better than standard vane vented rotors. The Girodisk uses standerd vane rotors.
Based on the fact that DBA has better cooling technology, costs less, and has been in business longer, the choice would be simple for me.

 

Hi guys,
All three companies are producing good products. It would be hard to go wrong with any of them.
I was an engineer with Brembo until recently anmd I have seen tests and the results of comparisons of cooling rates versus rotational speeds for straight vane, curved vane, and pillar vane.
Curved vane rotors act as an active air pump when rotating. Pillar vanes do not. Every serious racing vehicle using iron rotors is running curved vane rotors, and for good reason.
Brembo, AP, Performance friction, Stop-tech, Alcon etc are using curved vane rotors for all racing applications. You will not find pillar discs on any serious racing application. Pillar discs are cheaper to make in production. That is why they exist. The DBA "kangaroo paw" is a variation of this theme, and is functional, but it does not outperform similar curved vane designs.
But again, all of these brake rotors will outperform the OE rotors.
-Eric