I am changing my front brake soon and i am undecided which rotors to go with. I have read up alot on each rotor and i can get them for pretty much the same price. I am just wondering if anyone has any experience with any of them. Thanks

 

I have experience with dba on Subarus- amazing rotors. I ran rallies, track days, and plenty of autocross and road course racing on the dba's with Ferodo pads- they are simply bulletproof.
As for Powerslot, I've had them on my old EP (briefly- read on) and they were on my old EF when I bought it. On the EP, on track day #1 (lap six at Pocono's northeast loop, if you must know ), one shattered whilst coming off the banking into the infield. 130 MPH, and no brakes. Holy poop yourself moment! Smoked the handbrake coming down, ran across the infield lawn- thankfully, nobody nearby. They were broken in properly, and had 1,500 miles on them. Got yelled at, had the whole field stopped while I had to pick up pieces of rotor Bad day.
When I got the EF, I ripped them off post-haste, and put on Brembo blanks (it was NOT to be a track car). Note: these were NOT the cryo-treated bits, but the standards. Even still, no thanks! Mark W.

 

LOL... i had the exact same dilemma in autumn! here's the thread: https://www.fitfreak.net/forums/fit-...ake-setup.html

I finally went with the power slot because they should resist longer, as i mentioned in the other thread, the cryo treatment improves the structure of the material by transforming austenite in martensite... the grain structure becomes finer, thus, it makes a very hard material, the only downside from this is that it makes the material very fragile, but hopefully this does'nt apply for alloys...

as for DBA, i'm sure they're great too! but i've seen a few people who saw cracks develop on the surface!!!

BTW power slots have directional vanes, so they probably even cool faster than the kangaroo paw pillars

 

I have to disagree with the last bit- if you look at modern race rotors, virtually all of them use a similar, if not the exact same, pattern as the dba rotors. Virtually no race rotors are slotted anymore.
As for the cryo treatment, it absolutely does harden and strengthen the rotor at the atomic level, which may well pay dividends in terms of durability. I still can't speak for the cryo's, but I can say I've seen the standard Powerslots fail on the track several times- Mark W.

 

talking about the vanes, not the face of the rotor, the "pillars" i'll take pics tonight!

 

Just want to add that cryo treating, especially "deep" cryo definitely does not make the material fragile in any sense.. it makes it denser and removes residual stresses from the manufacturing process.

Which is why you cryo treat parts like cranks, rods, input shafts, gear sets, brakes, cams, turbos etc.

That is the same reason you have them REM and ISF treated, and if you all three you have removed the stress risers on the surface and along casting seams.

I go to these guys:
http://www.nwcryo.com/motorsports.html

And Rocky Mountain Cryo, but their website seems to have gone missing..

 

not the case for alloys, but not always true... Martensite - Wikipedia, the free encyclopedia
you can't have something perfect, with a harder material comes less elasticity, meaning that the material will not have a big deformation before breaking... thus being more "fragile" cryo treatment would make the material similar to the black line vs the green one

 

Thanks for all the great input guys! I have decided to get the DBA's. I just helped my friend install these on his MS3 and i was quite impressed with them.

 

All I can say here is I have been rocking the Cryo treated Power Slots in my '07 Fit for a looooong time. Since 2008 they have gone through many many auto x's and one weekend at New Jersery Motorsports park with Track Daze.

The same rotors have seen Hawk HPS, Hawk HP+, and now EBC Yellows. I always recommend them because they have worked so great for me.

I can't say DBA's are any worse or better because I don't have any personnel experience, but I know a lot STi's rock them... so they can't be bad either.

 

as i said, cryo treatment should give better longevity than dba