Vendor GiroDisc 370mm Rotors for GM Brembo 6-Pot Calipers

It takes a village to raise a kit. This one is TMC's very own. @Lukez pioneered the 6-piston CTS-V DIY for the Model S. Then @jesse_le prototyped a rotor with GiroDisc for the Model 3 and Y. These full-floating slotted GiroDisc rotors for the Model 3 and Y come in at 370mm x 34mm. This mirrors the rotor size on the Cadillac CTS-V, Corvette C7 Z06, and other GM performance vehicles allowing fitment of massive GM 6-piston Brembos. For comparison, the OEM Model 3 Performance 2-piece rotor measures in at 355mm x 25mm while the OEM 1-piece "Base" Rotor measures a paltry 320mm x 25mm.

The GiroDisc rotors differentiate themselves from other manufacturers with U.S. sourced iron and beautifully anodized U.S.-sourced 6061-T6 aluminum rotor hats. The hat is also 4mm thicker than OEM which helps clear the unique stepped hub of the Model 3 Performance and obfuscates the need for small wheel spacers. The GiroDisc is also a true 2-piece rotor allowing you to replace the rings without need to replace the hats.

OEM GM Brembo 6-piston Calipers​

The GiroDisc rotors allow you to mount OEM GM Brembos from a number of GM performance vehicles including the ATS-V, CTS-V, and C7 Corvette Z06. These are lightweight 6-piston monoblock aluminum calipers that are optimized for cooling, specified as "low drag", and are designed to fit under 18" wheels. They mount up to the OEM Tesla front knuckle by either drilling out your caliper mounting holes to accept M14 caliper bolts or re-threading the caliper to accept the OEM Tesla M12 hardware. The latter allows you to return the vehicle completely to stock.

Another benefit of the GM 6-piston Brembos is a wide assortment of available brake pads. If you have ever searched for brake pads for the stock Model 3 Performance calipers you know that the selection for this seemingly proprietary caliper can be somewhat limited. The GM calipers feature a standard FMSI D1405 pad shape which opens up pad options from $64 Centric OE replacement street pads up to $700+ Ferodo DSUNO race pads.

Ordering​

As these are a relatively new offering, GiroDisc requires a minimum of 5 rotor pairs to make a production batch. Pricing is $1,200 per pair with free shipping to the continental U.S. There is an approximate 4 to 6 week lead time from the batch order for fulfillment. There is already some interest in the next batch and my hope is that the demand is strong enough for these to become regular stock at Emotive Engineering.

... and introducing... The EmotiVetted GM 6-Pot Bolt-on BBK​

This is a full bolt-on affair which allows you to reuse your factory caliper mounting bolts (brake dust shield removal required).

Street Kit - $2,649

• CTS-V Calipers - Silver (or optional Yellow) - re-threaded to accept factory Tesla caliper bolts
• GiroDisc 370mm 2-Piece Rotors
• DBA SP500 Street Performance Pads - copper-free ceramic pads, low-noise, and low-dust. Everything an OE+ street pad should be.
• Spiegler Stainless Steel Brake Lines
• OE GM Caliper Hardware

Track Kit - $2,899

• C7 Corvette Z06 Calipers - Red - re-threaded to accept factory Tesla caliper bolts
• GiroDisc 370mm 2-Piece Rotors
• G-LOC R12 Track Pads - amazing pedal modulation, rotor friendly, at the expense of some noise and dust.
• Spiegler Stainless Steel Brake Lines
• OE GM Caliper Hardware

Not ready to go full on BBK? Emotive Engineering is an authorized GiroDisc dealer offering a full line of OE-replacement 2-piece rotors for your Tesla Model 3 or Y.

 

[emotiveeng]

Are the rotors available?

Need one more order to kick off a production run. 4 to 6 week lead time for rotors from there.

 

[Snelson3]

Are the rotors available?

Not yet - they are still looking for one more interested party to get the minimum. Let’s hope that might be you?

 

[emotiveeng]

I need to head in to the shop for more photos this weekend, but ready to offer this up as a kit for those who do not want to fill their garage with metal shavings while re-threading the calipers or shopping around for parts. Still working on a more elegant bracket solution for the Spiegler lines. Having these ready to accept the factory M12 caliper bolts makes install a breeze. As we have already had photos confirm, there is plenty of room under 18" wheels - APEX EC-7 pictured.

Street Kit - $2,649
CTS-V Calipers - Silver (or optional Yellow)
DBA SP500 Street Performance Pads - copper-free ceramic pads, low-noise, and low-dust. Every thing an OE+ street pad should be.

Track Kit - $2,899
C7 Corvette Z06 Calipers - Red
G-LOC R12 Track Pads - amazing pedal modulation, rotor friendly, at the expense of some noise and dust.

Product pages will be up on the site next week. All kits will include re-threaded calipers to accept your factory caliper bolts. The hardest part will be removing your dust shields, which require just a couple of cuts with tin snips and a little muscle. Also included are the all important GiroDisc 370mm rotors, Spiegler stainless steel brake lines, and all caliper hardware. The default Track and Street Kits are for those who just want to hit the easy button. If you want to source specific calipers/caliper colors, pads, or brake line colors just reach out. Custom color powdercoating is an additional $500 - hope to have an example soon.

The longest lead time right now is another rotor production run. Expect 4 to 6 weeks after that production order is made at which point I will keep some rotors and kits in stock.

 

[Snelson3]

Good news! I just placed my rotor order on your webpage, looking forward to getting this going.

 

[drpheta]

Going to say factory bolts would be gravy. Wish Tesla had a bolt that fit these calipers. The bolts I grabbed from ZZPerformance aren't corrosion resistant.

Just need to find the GM P/N for it.

 

[emotiveeng]

Going to say factory bolts would be gravy. Wish Tesla had a bolt that fit these calipers. The bolts I grabbed from ZZPerformance aren't corrosion resistant.

Just need to find the GM P/N for it.

I had a tab open! M14 x 2 x 50.GM P/N 11570092

 

[stevehifi]

Is it possible to remove the ‘corvette’ logo silkscreen on the face of the red caliper so it’s blank without having to repaint/powder coat it?

Maybe buffing it off or something with decal remover liquid.

 

[yjypm]

Is it possible to remove the ‘corvette’ logo silkscreen on the face of the red caliper so it’s blank without having to repaint/powder coat it?

Maybe buffing it off or something with decal remover liquid.

I believe coming out the factory the logo is painted on top of the color coat then topped off with a clear coat. To buff it off you’ll have to buff off the clear coat at least.
You then need to disassemble the calipers and powdercoat a clear coat, or you might as well just sandblast and redo the powdercoat, or paint on top of the original calipers.

 

[jesse_le]

I scuffed mine with red Scotch bright pad to removed the silkscreen logo and resprayed the top only.

If you decide to say yellow, the OEM yellow on the caliper is Chevy Broom Yellow. Who ever is mixing it, have them leave out the pearls.

 

[jesse_le]

@emotiveeng - love the kit!!

 

[Lindenwood]

Honestly the difference in feel from stock Performance brakes from regular or even slightly spirited driving is noticeable, but otherwise subtle (which I think is a good thing on a street car…I don’t want F1 pedals with my wife driving). I would probably say the following jumps provided the same relative improvements in pedal feel:
1) Stock —> 2) Stock + MPP Master Cylinder Brace (say, a 10%-15% increase in pedal stiffness and responsiveness)
And
2) “…” —> 3) Brembo fronts + Powerstop Track Day Pads + XT910 Rear pads + MPP SS brake lines (another perhaps 10-15% increase in responsiveness.

I have had no additional noises or anything. Obviously I wasn’t particularly outrunning the stock brakes coming off the occasional spirited highway ramp or empty roundabout (or even doing AutoX), so I can’t provide any real heat-related feedback. But, I feel good about the coming road course event!

To follow up, I bled my brakes again in anticipation of my track days this weekend, and the pedal firmed up even more. I would now describe it as 20-25% stiffer than stock.

 

[PrincessStela]

To follow up, I bled my brakes again in anticipation of my track days this weekend, and the pedal firmed up even more. I would now describe it as 20-25% stiffer than stock.

Please report back. Definitely want to hear how these hold up on the track.

 

[stevehifi]

looking for some feedback from owners as well from running these at HDPE or track sessions. Would be good to know:
-how thermal management has improved
-improvements in stopping power
-consistency in brake application and operation (especially with rear brakes)

 

[Lindenwood]

Before I forget!

The rotor hats are a full 5mm thicker than factory! A not-insignificant difference when picking aftermarket wheels!

 

[emotiveeng]

looking for some feedback from owners as well from running these at HDPE or track sessions. Would be good to know:
-how thermal management has improved
-improvements in stopping power
-consistency in brake application and operation (especially with rear brakes)

I should have some feedback from Sonoma next weekend - running same G-LOC R12 compound as the car has been running with P-car brakes.

 

[daniloreyes]

I need to know if someone has tried the sleeves to put in the bolts to convert from 14mm to 12mm and where they are available. That will let me know if I should just buy the rotors and then I'll buy the calipers by myself.

 

[emotiveeng]

I need to know if someone has tried the sleeves to put in the bolts to convert from 14mm to 12mm and where they are available. That will let me know if I should just buy the rotors and then I'll buy the calipers by myself.

@Snelson3 has a DIY earlier in the thread.

Tools: Time-Sert 1217
M12x1.75x24mm Inserts: Time-Sert 12173

Available from Time-Sert directly, various tool suppliers, or on Amazon.

 

[drpheta]

I need to know if someone has tried the sleeves to put in the bolts to convert from 14mm to 12mm and where they are available. That will let me know if I should just buy the rotors and then I'll buy the calipers by myself.

I found aluminum tubes on Amazon that are 14mm OD and 12mm ID. They fit perfectly, but you just need to cut them to the proper length.

 

[Lindenwood]

I did something like 25 laps on a 1.7-mile course today. The last half were all in chill mode to conserve battery (which had the now-obvious huge benefit of forcing me to focus more on my lines since it becomes very obvious when I had lost too much speed in a corner).

Still, top speeds on the front straight were right at 100mph for me (and about 85 in chill mode), and I certainly got the brakes blue. Still, absolutely zero fade.

Of note, I was using about 3.5% battery per hot lap, but maxing out at 1.5% per lap in Chill mode. I accidentally started and stopped the recording, but I got to battle it out with one of the instructors my last ~5 laps. The instructor was in a Spec Miata (single seat, caged, NA, and mloud as hell) on 200tw tires. I was pretty proud that I held my own the entire time in chill mode (admittedly also with 200tw tires and probably more in my suspension and brakes than the Miata cost in its entirety ).

 

[jesse_le]

Finally got my setup installed.