well i need new pads and rotors. so i've been thinking about the 2 pc rotors. well my question is if it saves rotating weight at each corner, i would technically get more power to each corner because theres less weight there. yess or no?
what else makes a two pc design better than a one piece?

 

I think it's basically less rotating mass and better cooling so more resistant to brake fade I would assume.

 

less unsprung and rotating weight = more power.

 

I would not recommend these for daily driving. They can be noisier. Gains to more net whp would be minimal.

 

There are a few big differences between 1pc and 2pc.

1pc rotors are pillar vane which do fine for cooling at slow speeds but at high speeds don't do much of anything

2pc rotors are direction vane so at high speeds they at like a pump forcing air though the rotor, helping to keep it cool.

Most premium 1pc rotors use a standard gray iron which is good but some 2pc rotor manufactures (like us) use a ductile iron which is much denser then gray iron. This makes for a more durable rotor with longer life.

Girodisc rotors are also a fully floating as opposed to a bolted design. A fully floating rotor has the ability to let the aluminum hat and iron rotor to expand un-opposed to each other as they heat up. With a 1pc or bolted rotor the energy from heat expansion will push into the hat and this can cause premature cracking and warping of your rotor. A floating rotor will be able to stay true and will not fatuge under repeated heavy use.

An lastly the rotor assys are lighter. By replacing the center section with aluminum the rotor can be between 4-7lbs lighter per rotor. For Girodisc a full set of rotors is a 20lbs reduction in rotational mass.

Now obviously we are biased to our products but if you are shopping for a 2pc rotor look for a floating rotor with ductile iron. They will outlast many sets of one piece rotors and save you money in the long run.

 

/\ nicely said makes me want to pick up some

 

2pc rotors do not generate noise. If you are getting noise from swapping rotors its probably your pads. 2pc rotors will run cooler then a 1pc rotor so you might be getting squeaking from your pads not having a good cold bite. There are however many pads on the market that have great cold bite and work very well with 2pc rotors. There is no real downside to swapping to 2pc rotor except for justifying buying them for a street car that will never really utilized them to their full potential so its in the eye of the beholder. We have had a 100% street car go though 3 sets of Ferodo DS2500s and get 60k miles on these rotors before needing a replacement so if you can justify the purchase then your good to go.