Rotor Questions
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Rotor Questions
After reading Triny's Rotor Engineering & Buschur's Rotor Dyno Test, I have some questions:
1) Floating vs. Non-floating
Floating allows the rotor to remain perfectly parallel with the brake pads at all times, eliminating the effect of spindle or strut flex while under severe braking or cornering (i.e. turning into a corner with the brakes still on). This most certainly helps driver "feel" for brake modulation, along with reduced "pad taper" and rotor wear . A cooler running brake rotor is also attained relative to a non-floating type. For a track only or race car, the floating rotor is the way to go. It's really only necessary in the front but has been used on all four corners on some serious race cars (Formula-1, GTP). However please be aware that a floater can make a slight knocking noise at low speeds, so they can be annoying for street use.
As for non-floating, it does not move independently from its mounting flange or hub. When the spindle or strut flexes under severe conditions, the rotor moves right along with it, allowing it to become slightly cocked relative to the brake pad. This promotes small amounts of pad taper and a hotter running brake rotor. However, this is the recommended rotor for the street , or combination street / lite track car. It is still an excellent rotor because of the quality of the casting, the heat treating and shear heat sink mass
Question: Do floating rotors really make this annoying knocking sound at low speeds? Anybody with floating rotors please chime in.
2) Is lighter better? Or depends on application?
Floating seems lighter cause less material but I guess kind of material matters too. Based on Buschur's test, Baer is the lightest (non-floating) vs. heavier Racing Brakes (floating). My Evo is dd and soon to be track car also.
3) What are things to look for when purchasing rotors?
Thanks Guys!!!
1) Floating vs. Non-floating
Floating allows the rotor to remain perfectly parallel with the brake pads at all times, eliminating the effect of spindle or strut flex while under severe braking or cornering (i.e. turning into a corner with the brakes still on). This most certainly helps driver "feel" for brake modulation, along with reduced "pad taper" and rotor wear . A cooler running brake rotor is also attained relative to a non-floating type. For a track only or race car, the floating rotor is the way to go. It's really only necessary in the front but has been used on all four corners on some serious race cars (Formula-1, GTP). However please be aware that a floater can make a slight knocking noise at low speeds, so they can be annoying for street use.
As for non-floating, it does not move independently from its mounting flange or hub. When the spindle or strut flexes under severe conditions, the rotor moves right along with it, allowing it to become slightly cocked relative to the brake pad. This promotes small amounts of pad taper and a hotter running brake rotor. However, this is the recommended rotor for the street , or combination street / lite track car. It is still an excellent rotor because of the quality of the casting, the heat treating and shear heat sink mass
Question: Do floating rotors really make this annoying knocking sound at low speeds? Anybody with floating rotors please chime in.
2) Is lighter better? Or depends on application?
Floating seems lighter cause less material but I guess kind of material matters too. Based on Buschur's test, Baer is the lightest (non-floating) vs. heavier Racing Brakes (floating). My Evo is dd and soon to be track car also.
3) What are things to look for when purchasing rotors?
Thanks Guys!!!
The Eradispeeds are a "pretty" rotor and they are very light, so good for street/drag/autocross, but last time I checked with Baer they didn't recommend them for track use.
Here's some interesting pictures/comments on the PFCs vs Racing Brake 2-piece rotors:
https://www.evolutionm.net/forums/sh...9&postcount=34
https://www.evolutionm.net/forums/sh...3&postcount=52
Here's some interesting pictures/comments on the PFCs vs Racing Brake 2-piece rotors:
https://www.evolutionm.net/forums/sh...9&postcount=34
https://www.evolutionm.net/forums/sh...3&postcount=52
Last edited by EVO8LTW; Apr 25, 2008 at 06:18 AM.