Feeler: Girodisc 2-piece floating rotors for E46 M3
Hi guys, some people expressed interest in two-piece rotors in ZCP/CSL sizes (345x28 and 328x20) so I wanted to break it off into its own thread.
Disclaimer: I work at Girodisc, but I don’t work in sales or engineering. I own an E46 M3 myself, and I’d like to run these rotors on my own car.
Tl;dr is that our usual policy is if 5 people express solid interest, we start drawing rotors up and test fitting them. Add yourself to the list in the next post if you’re interested. No deposits or anything now, but we will secure orders when we have the design ready for production.
Tentative price: ~$1000/pair for the fronts. Could come in a little under. Replacement rings (including new attachment hardware) will be in the $500-550 range. We've found that between the superior iron mix and the more effective cooling, they tend to last way longer than OEM discs even under track use.
In-depth overview
General: Girodisc has been around since 2003, starting with application #001 for Ferrari 360s. All parts are machined in-house in the USA. We use a two-piece, fully floating design that saves weight over OE discs thanks to the aluminum hat and holds up to serious abuse. We're known in the Porsche world with the guys who track their cars regularly, including our plug & play kits to convert from carbon ceramics to iron rotors.
Hat: We machine them from 6061-T6 aluminum that is sourced domestically. These will be black hard anodized (see attached photo of our 458/488 Challenge rotors for an example). Floating hardware consists of cadmium-plated pins (machined in-house as well) and 12.9-grade hardware using a combination of Belville and spring washers for full float. This means they won’t rattle around on the street but can fully accommodate the iron disc expanding & contracting with heat.
Rotor: We machine raw castings that are poured to our specifications by a foundry in the Midwest. We use a proprietary blend of iron that lends itself to being more durable under extreme use and longer lasting. Rotors are slotted and not drilled since most of our customers end up taking them to the track. Our design has curved, centrifugal vanes that act as an air pump and is much more effective at shedding heat than straight, pillar-vaned rotors.
E46 M3 fronts: 345x28, direct swap with OEM. This size of rotor will have 48 curved vanes. Will work with 996, Megane RS, etc. retrofits designed to work with stock rotors, as well as the stock, sliding calipers.
E46 M3 rears: This will be more complicated. As many of you know, PFC makes a 2-piece rear rotor but requires a unique pad shape to clear the 2-piece hardware. There are ways we can get around this, and I’ll be bringing my car in to get it up on our lift and see what we can do. So for now, consider the fronts good to go, and the rears pending.
Let me know if you guys want any more details or have any other questions. Anything that I can’t answer I can find out for you guys. Thanks!
Disclaimer: I work at Girodisc, but I don’t work in sales or engineering. I own an E46 M3 myself, and I’d like to run these rotors on my own car.
Tl;dr is that our usual policy is if 5 people express solid interest, we start drawing rotors up and test fitting them. Add yourself to the list in the next post if you’re interested. No deposits or anything now, but we will secure orders when we have the design ready for production.
Tentative price: ~$1000/pair for the fronts. Could come in a little under. Replacement rings (including new attachment hardware) will be in the $500-550 range. We've found that between the superior iron mix and the more effective cooling, they tend to last way longer than OEM discs even under track use.
In-depth overview
General: Girodisc has been around since 2003, starting with application #001 for Ferrari 360s. All parts are machined in-house in the USA. We use a two-piece, fully floating design that saves weight over OE discs thanks to the aluminum hat and holds up to serious abuse. We're known in the Porsche world with the guys who track their cars regularly, including our plug & play kits to convert from carbon ceramics to iron rotors.
Hat: We machine them from 6061-T6 aluminum that is sourced domestically. These will be black hard anodized (see attached photo of our 458/488 Challenge rotors for an example). Floating hardware consists of cadmium-plated pins (machined in-house as well) and 12.9-grade hardware using a combination of Belville and spring washers for full float. This means they won’t rattle around on the street but can fully accommodate the iron disc expanding & contracting with heat.
Rotor: We machine raw castings that are poured to our specifications by a foundry in the Midwest. We use a proprietary blend of iron that lends itself to being more durable under extreme use and longer lasting. Rotors are slotted and not drilled since most of our customers end up taking them to the track. Our design has curved, centrifugal vanes that act as an air pump and is much more effective at shedding heat than straight, pillar-vaned rotors.
E46 M3 fronts: 345x28, direct swap with OEM. This size of rotor will have 48 curved vanes. Will work with 996, Megane RS, etc. retrofits designed to work with stock rotors, as well as the stock, sliding calipers.
E46 M3 rears: This will be more complicated. As many of you know, PFC makes a 2-piece rear rotor but requires a unique pad shape to clear the 2-piece hardware. There are ways we can get around this, and I’ll be bringing my car in to get it up on our lift and see what we can do. So for now, consider the fronts good to go, and the rears pending.
Let me know if you guys want any more details or have any other questions. Anything that I can’t answer I can find out for you guys. Thanks!
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