Sponsored

Anyone using Girodisc's rotors on their GT350?

honeybadger

Just don't care
Joined
Apr 20, 2016
Threads
59
Messages
3,697
Reaction score
6,206
Location
COTA
First Name
Kevin
Vehicle(s)
'17 GT350
Hi all -

Planning for some big trips this summer and working through my list of consumables. I'm exploring brake options before I commit and am wondering if anyone has tried the Girodisc rotors? Wanted to see if anyone has some real feedback/data points to share?

I'm currently testing out Raybestos ST43s on the OEM rotors. When I used G-Loc R16s last year, the OEM rotors last 15 track days before they were toast. But that was before R compound tires, which are looking like they might cut the life by 1/3rd or so.

I have 8 track days scheduled within a 2ish week time period that will be hell on the brakes and am looking for something maybe more durable. Thoughts? Anyone have real feedback?
Sponsored

 
Last edited:

tdzee

Well-Known Member
Joined
Nov 4, 2015
Threads
32
Messages
866
Reaction score
346
Location
Atlanta Motorsports Park
First Name
Tom
Vehicle(s)
85 Corvette, 04 Corvette Z16, 08 350Z NISMO, 15 CTS-V Coupe, 17 GT350R
Are you looking for suggestions on pads or rotors?
 

Austinj427

Well-Known Member
Joined
Aug 31, 2017
Threads
11
Messages
806
Reaction score
448
Location
CO
Vehicle(s)
2017 GT350
Vehicle Showcase
1
Are you looking for suggestions on pads or rotors?
The girodiscs are rotors.

OP I don't have anything for you on that one. I know they are pricey, if it was me I would be ordering a second set and keeping them in the car until you get the the track.
 
OP
OP
honeybadger

honeybadger

Just don't care
Joined
Apr 20, 2016
Threads
59
Messages
3,697
Reaction score
6,206
Location
COTA
First Name
Kevin
Vehicle(s)
'17 GT350
Are you looking for suggestions on pads or rotors?
Rotors. Just wondering if anyone is running them for hard track use on the GT350 and what their feedback is.

The girodiscs are rotors.

OP I don't have anything for you on that one. I know they are pricey, if it was me I would be ordering a second set and keeping them in the car until you get the the track.
If I go with OEM, I plan to start on a new set and carry a back up with me in the trailer. Too much travel and cost in track fees to miss out from a few $$ on rotors :)
 

HISSMAN

Large Member
Joined
Jun 10, 2016
Threads
39
Messages
2,992
Reaction score
1,459
Location
West Virginia
Vehicle(s)
2016 Oxford White GT/PP Premium
I had them on my EVO X. They were very good.
 

Sponsored

Trackaholic

Well-Known Member
Joined
Nov 9, 2013
Threads
7
Messages
3,036
Reaction score
1,472
Location
USA
Vehicle(s)
2003 350Z, 2016 GT350, 2018 Pacifica Hybrid
What about the girodisc rotors would make them last longer than OEM?

Do they have a significantly better venting arrangement that would keep temps down? Or are they a different material that won't wear as much?

They mention having optimized cooling, using curved vanes, but the OEM rotors use curved vanes as well (but not sure how the density compares). Looking at photos, the girodisc vanes look to be more tightly spaced, which would be better for cooling.

One nice thing about the OEM rotors is their relatively low cost. They run ~$550 for a set of front rotors. I don't see prices for the GT350 rotors on the girodisc website. On amazon, the regular Mustang GT girodisc rotors are $800 for the cast iron rings only.

I imagine the GT350 ones would be similar in price, so they would defnitely need to have an improvement in life for the cost to balance out.

Anyway, I'm sure you've thought about all those aspects already, but (having just replaced my own OEM rotors due to pad deposits) it help me to think it through a bit. I'll be interested to see which way you end up going, and hearing your results.

If you really want to go nuts, you could get the AP Racing setup, but you're talking quite a bit more at that point.

-T
 
OP
OP
honeybadger

honeybadger

Just don't care
Joined
Apr 20, 2016
Threads
59
Messages
3,697
Reaction score
6,206
Location
COTA
First Name
Kevin
Vehicle(s)
'17 GT350
What about the girodisc rotors would make them last longer than OEM?

Do they have a significantly better venting arrangement that would keep temps down? Or are they a different material that won't wear as much?

They mention having optimized cooling, using curved vanes, but the OEM rotors use curved vanes as well (but not sure how the density compares). Looking at photos, the girodisc vanes look to be more tightly spaced, which would be better for cooling.

One nice thing about the OEM rotors is their relatively low cost. They run ~$550 for a set of front rotors. I don't see prices for the GT350 rotors on the girodisc website. On amazon, the regular Mustang GT girodisc rotors are $800 for the cast iron rings only.

I imagine the GT350 ones would be similar in price, so they would defnitely need to have an improvement in life for the cost to balance out.

Anyway, I'm sure you've thought about all those aspects already, but (having just replaced my own OEM rotors due to pad deposits) it help me to think it through a bit. I'll be interested to see which way you end up going, and hearing your results.

If you really want to go nuts, you could get the AP Racing setup, but you're talking quite a bit more at that point.

-T
You've hit the nail on the head of what I'm trying to figure out. So far i can't find conclusive evidence either way. I am tempted to try them just for the data point. But you've also brought up my real hesitation - the AP racing setup.

I foresee heavy, heavy track use for the next 2-3 years and I am seriously tempted by the AP kit for my big upgrade this winter - for both weight and the ability to run 18s. Upgrading to the Girodisc rotors if I go that path seems like a waste.
 

7litergt

Member
Joined
Jun 27, 2017
Threads
1
Messages
21
Reaction score
7
Location
CA
Vehicle(s)
2017 GT350 (H4200), 1966 Fastback 427W
Interested in these rotors as well. Question to you guys with lots more track time than me; are you seeing any signs of cracking around the drilled holes in the OEMs?

I figured the biggest plus would be going to a non-drilled rotor if the OEMs were cracking at all in those areas with all the extreme heat cycles.
 

firestarter2

Well-Known Member
Joined
Jun 16, 2016
Threads
69
Messages
3,209
Reaction score
1,163
Location
NYC
Vehicle(s)
RR G350 Track
I think my rotors where about 400 for a pair (199 each)
What about the girodisc rotors would make them last longer than OEM?

Do they have a significantly better venting arrangement that would keep temps down? Or are they a different material that won't wear as much?

They mention having optimized cooling, using curved vanes, but the OEM rotors use curved vanes as well (but not sure how the density compares). Looking at photos, the girodisc vanes look to be more tightly spaced, which would be better for cooling.

One nice thing about the OEM rotors is their relatively low cost. They run ~$550 for a set of front rotors. I don't see prices for the GT350 rotors on the girodisc website. On amazon, the regular Mustang GT girodisc rotors are $800 for the cast iron rings only.

I imagine the GT350 ones would be similar in price, so they would defnitely need to have an improvement in life for the cost to balance out.

Anyway, I'm sure you've thought about all those aspects already, but (having just replaced my own OEM rotors due to pad deposits) it help me to think it through a bit. I'll be interested to see which way you end up going, and hearing your results.

If you really want to go nuts, you could get the AP Racing setup, but you're talking quite a bit more at that point.

-T
 
OP
OP
honeybadger

honeybadger

Just don't care
Joined
Apr 20, 2016
Threads
59
Messages
3,697
Reaction score
6,206
Location
COTA
First Name
Kevin
Vehicle(s)
'17 GT350
Interested in these rotors as well. Question to you guys with lots more track time than me; are you seeing any signs of cracking around the drilled holes in the OEMs?

I figured the biggest plus would be going to a non-drilled rotor if the OEMs were cracking at all in those areas with all the extreme heat cycles.
My cracks showed up after about (4) days. Here are what mine looked like at around (12) days. These are with street tires, so the stress was quite a bit less. I'm expecting 1/3-1/2 less life with R compound tires.

20180119_163905.jpg
 

Sponsored
OP
OP
honeybadger

honeybadger

Just don't care
Joined
Apr 20, 2016
Threads
59
Messages
3,697
Reaction score
6,206
Location
COTA
First Name
Kevin
Vehicle(s)
'17 GT350
I think my rotors where about 400 for a pair (199 each)
It's about $463 shipped to my door per set of fronts for me. I'm estimating going through 2-3 a year
 

7litergt

Member
Joined
Jun 27, 2017
Threads
1
Messages
21
Reaction score
7
Location
CA
Vehicle(s)
2017 GT350 (H4200), 1966 Fastback 427W
Yeah, those cracks are no joke. Ive only got one full day on mine at the moment, things to look forward to I guess...

Either way, solid rotors could probably relieve that pain, but they certainly aren't cheap.
 

firestarter2

Well-Known Member
Joined
Jun 16, 2016
Threads
69
Messages
3,209
Reaction score
1,163
Location
NYC
Vehicle(s)
RR G350 Track
My cracks showed up after about (4) days. Here are what mine looked like at around (12) days. These are with street tires, so the stress was quite a bit less. I'm expecting 1/3-1/2 less life with R compound tires.

20180119_163905.jpg
Mine looked worse than that. I have been told till the cracks meet you are ok to keep using them. I replaced mine though,
 
OP
OP
honeybadger

honeybadger

Just don't care
Joined
Apr 20, 2016
Threads
59
Messages
3,697
Reaction score
6,206
Location
COTA
First Name
Kevin
Vehicle(s)
'17 GT350
Mine looked worse than that. I have been told till the cracks meet you are ok to keep using them. I replaced mine though,
I've heard that too. I just replaced mine because the pads were toast as well. But scary pushing brake life to the limit on a 3800lbs car in heavy breaking zones from 150-40mph :eyebulge:
 

firestarter2

Well-Known Member
Joined
Jun 16, 2016
Threads
69
Messages
3,209
Reaction score
1,163
Location
NYC
Vehicle(s)
RR G350 Track
I've heard that too. I just replaced mine because the pads were toast as well. But scary pushing brake life to the limit on a 3800lbs car in heavy breaking zones from 150-40mph :eyebulge:
Mine were still in spec thickness wise, but I didnt want to them to start falling apart in the middle of the day. Im pleased they are so cheap TBH.
Sponsored

 
 




Top