[Mrwatchdawg]

Creating this thread for those of us that will track the car. Can we get some links for the following stuff, anyone with experience

• Harness options for carbon buckets
• Better brake kit
• Suspension
• Wheel and tire combo
• Stainless steel brake lines?
• Alignment setup

And anything else I may have missed here.

[ZPD]

Regarding the harness option for Carbon buckets:
I have been in contact with Schroth and they are not intending to do system for the G8x platform. They do not see the demand. Feel free to email them and ask and perhaps if enough of us do then they will change their mind. The only option is to do a roll cage and attach a harness to that or do a harness bar. I could not find a harness bar for the G87. Brey-Krause makes one for the F87 but I got some key measurements from one of their distributers and compared it to my car and unfortunately, it will not fit. I am thinking about making my own this winter when it is not so damn hot. I will post it if I do.

[ZPD]

Originally Posted by Mrwatchdawg

Creating this thread for those of us that will track the car. Can we get some links for the following stuff, anyone with experience

• Harness options for carbon buckets
• Better brake kit
• Suspension
• Wheel and tire combo
• Stainless steel brake lines?
• Alignment setup

And anything else I may have missed here.

But to respond to your question- I just made some purchases this week to get ready for a few track days in Sept. Here is my list:
19x10.5 et18 Apex VS-5RS
Nankang 295/30/19 tires
Millway Camber plates
EBC bluestuff trackday pads
Xpel ppf on the front

After I get a few track days in I will see if I need Motul brake fluid or a lower suspension. Aero mods is pretty far down the list for me.

[M1500Z]

Originally Posted by ZPD

But to respond to your question- I just made some purchases this week to get ready for a few track days in Sept. Here is my list:
19x10.5 et18 Apex VS-5RS
Nankang 295/30/19 tires
Millway Camber plates
EBC bluestuff trackday pads
Xpel ppf on the front

After I get a few track days in I will see if I need Motul brake fluid or a lower suspension. Aero mods is pretty far down the list for me.

Without knowing anything about your background/track experience, looking at the changes you're planning to make, I would suggest going ahead and flushing fluid to SRF—there's really no downside. Especially if you'll be tracking at COTA.

The G cars are heavier and more powerful than the already heavy F cars and you're adding grip—higher speeds on the straight from exit traction and then putting more energy into the brakes (compounded by a more aggressive pad). Might as well cover your bases and not find yourself with a soft pedal due to cooked fluid.

I fully expect these cars to rip so enjoy it and maybe we'll see each other at the track.

[gcmak]

Originally Posted by ZPD

But to respond to your question- I just made some purchases this week to get ready for a few track days in Sept. Here is my list:
19x10.5 et18 Apex VS-5RS
Nankang 295/30/19 tires
Millway Camber plates
EBC bluestuff trackday pads
Xpel ppf on the front

After I get a few track days in I will see if I need Motul brake fluid or a lower suspension. Aero mods is pretty far down the list for me.

I have similar plans/parts on the way....
19x10 et12 Apex VS-5RS (will run 12mm future classic spacers in the rear - I currently have them on all 4 corners with OEM wheels).
undecided 275/35/19 tires
Millway Camber plates
CSG CP Pads
SRF Brake fluid

Considering the IND Fender liners so I can run 285 square instead.

I'll be honest after following Jackie Ding, I'm not sure pads and fluids are needed at all at least not for the first set of OE pads to wear through...yes the car is heavy, powerful and if adding sticky tires on a heavy braking track it is a risk, but you also cannot compare it to F87 because there's a ton of heat capacity in this new braking system too...

One thing I question though, with this car having brake by wire, how will it behave with pad fade or boiling brake fluid? Some manufacturers have warnings and other safeguards. Do we still feel a mushy pedal?

Alignment I'll target -3 and -2 to start but open to recommendations.
I ran this similar setup in a GR Supra and found it to do pretty OK, but wouldn't be surprised if I ended up wanting more negative camber up front.

[aerobod]

Originally Posted by gcmak

One thing I question though, with this car having brake by wire, how will it behave with pad fade or boiling brake fluid? Some manufacturers have warnings and other safeguards. Do we still feel a mushy pedal?

“Brake by wire” is more accurately described as “brake boost by wire”. There is still a hydraulic path from the brake pedal to the calipers, but variable electronically controlled electric/hydraulic assistance is provided instead of vacuum assistance. There is still some hydraulic feedback, although variable assistance could mask that if the control algorithms are designed that way, but it is still fundamentally a hydraulic system end-to-end.

[gcmak]

Originally Posted by aerobod

“Brake by wire” is more accurately described as “brake boost by wire”. There is still a hydraulic path from the brake pedal to the calipers...

Understood, but what got me interested in this type of system was initially some Acura (TLS maybe?) when they had journalists take it on track with reports of on-screen warnings, and now more recently the C8. This is how that system works and how it seems like a bit of a PITA for people who want to aftermarket parts. https://www.corvetteblogger.com/2021...arning-system/

[Sculpin]

No one in the history of track driving has ever said "using high temp brake fluid was a real waste of money."

[M1500Z]

Originally Posted by gcmak

I'll be honest after following Jackie Ding, I'm not sure pads and fluids are needed at all at least not for the first set of OE pads to wear through...yes the car is heavy, powerful and if adding sticky tires on a heavy braking track it is a risk, but you also cannot compare it to F87 because there's a ton of heat capacity in this new braking system too...

I can't say that the new car has increased capacity or not, but the rotor sizes are smaller than the F87 M2 competition came with (400x36 front and 380x32 rear).

The other thing I'll just point out is @ZPD lists their location in Texas so I'm assuming, or just hoping that they'll come out to COTA at some point. COTA's back straight is twice as long as Autobahn's (where Jackie did his initial video) and ends going into turn 12—having faith in your brakes when slowing the car down to ~40mph from 150+ is nice. Ultimately SRF is just cheap insurance—it also has such a high wet boiling point that a lot of people do bleed it once a year. You're already spending much more on other things and there is literally no downside to good fluid.

Originally Posted by Sculpin

No one in the history of track driving has ever said "using high temp brake fluid was a real waste of money."

This is a very efficient way to summarize what I just typed.

[ZPD]

Originally Posted by M1500Z

I can't say that the new car has increased capacity or not, but the rotor sizes are smaller than the F87 M2 competition came with (400x36 front and 380x32 rear).

The other thing I'll just point out is @ZPD lists their location in Texas so I'm assuming, or just hoping that they'll come out to COTA at some point. COTA's back straight is twice as long as Autobahn's (where Jackie did his initial video) and ends going into turn 12—having faith in your brakes when slowing the car down to ~40mph from 150+ is nice. Ultimately SRF is just cheap insurance—it also has such a high wet boiling point that a lot of people do bleed it once a year. You're already spending much more on other things and there is literally no downside to good fluid.



This is a very efficient way to summarize what I just typed.

Yep, I have done COTA several times in my previous car. I definitely will be switching out brake fluid before I go there in October. In Sept I am doing Cresson (and perhaps Harris Hill). I will run stock fluid there because it is a milder track and I like to get a baseline on my mods. If we are at any of the same events come say hi. I will have the red M2 with gold wheels and #43 on the side.

[gcmak]

Originally Posted by M1500Z

I can't say that the new car has increased capacity or not, but the rotor sizes are smaller than the F87 M2 competition came with (400x36 front and 380x32 rear).

Thanks for the clarification and am aligned with recommendations. Years of hitting up the track has told me not to skimp on brakes (among a few other key items).

[GT3M2]

Originally Posted by gcmak

I have similar plans/parts on the way....
19x10 et12 Apex VS-5RS (will run 12mm future classic spacers in the rear - I currently have them on all 4 corners with OEM wheels).
undecided 275/35/19 tires
Millway Camber plates
CSG CP Pads
SRF Brake fluid

Considering the IND Fender liners so I can run 285 square instead.

I'll be honest after following Jackie Ding, I'm not sure pads and fluids are needed at all at least not for the first set of OE pads to wear through...yes the car is heavy, powerful and if adding sticky tires on a heavy braking track it is a risk, but you also cannot compare it to F87 because there's a ton of heat capacity in this new braking system too...

One thing I question though, with this car having brake by wire, how will it behave with pad fade or boiling brake fluid? Some manufacturers have warnings and other safeguards. Do we still feel a mushy pedal?

Alignment I'll target -3 and -2 to start but open to recommendations.
I ran this similar setup in a GR Supra and found it to do pretty OK, but wouldn't be surprised if I ended up wanting more negative camber up front.

FWIW 295/35/18 here 0 rubbing YET with 5mm front spacer.

-GT3M2

[jhall1957]

Originally Posted by GT3M2

FWIW 295/35/18 here 0 rubbing YET with 5mm front spacer.

-GT3M2

Can you provide details and specs on wheels and which tires, please?

[GT3M2]

Originally Posted by jhall1957

Can you provide details and specs on wheels and which tires, please?

Wheel: Apex VS 5RS 18x10.5
Tire: Nankang CR-S 295/35/18

Stock Supension, 0 rubbing, 0 issues. Ride is far more compliant than stock, tons of turn in, more supple over big bumps and sharp edges, but front end will tramline a bit just do to the rack width up front.

TONS of room to lower it.

https://apexwheels.com/gallery/bmw/m...port-gold-1583



-GT3M2

[jhall1957]

Originally Posted by GT3M2

Wheel: Apex VS 5RS 18x10.5
Tire: Nankang CR-S 295/35/18

Stock Supension, 0 rubbing, 0 issues. Ride is far more compliant than stock, tons of turn in, more supple over big bumps and sharp edges, but front end will tramline a bit just do to the rack width up front.

TONS of room to lower it.

https://apexwheels.com/gallery/bmw/m...port-gold-1583



-GT3M2

Do you track your car? I assume a square tire/wheel setup.

[gcmak]

Originally Posted by GT3M2

Wheel: Apex VS 5RS 18x10.5
Tire: Nankang CR-S 295/35/18

Stock Supension, 0 rubbing, 0 issues. Ride is far more compliant than stock, tons of turn in, more supple over big bumps and sharp edges, but front end will tramline a bit just do to the rack width up front.

TONS of room to lower it.

https://apexwheels.com/gallery/bmw/m...port-gold-1583


-GT3M2

I didn't look closer into your original response. My best educated guess is that by running a wider but slightly smaller overall diameter tire than OEM, gives you the clearance needed to not rub on the vents or anywhere else. It's probably the best compromise you could make.

Visually by going down in overall diameter, it creates a larger all-around gap in the wheel wells; especially in the rear.

Here's the generic size comparison of the OEM front vs. your new tire size.


In the rear, as mentioned, the difference is more pronounced from OEM vs. your new tire size.

[GT3M2]

Originally Posted by gcmak

I didn't look closer into your original response. My best educated guess is that by running a wider but slightly smaller overall diameter tire than OEM, gives you the clearance needed to not rub on the vents or anywhere else. It's probably the best compromise you could make.

Visually by going down in overall diameter, it creates a larger all-around gap in the wheel wells; especially in the rear.

This in combination with cheaper tires, more sidewall, smaller overall wheel size, less weight, less inertia all are geared towards improving hard driving/track driving experience.

Car would look 200% better dropped on 20's but, for the track, I think this is " the way".

19's are not much of a compromise but having so much space is nice.

-GT3M2

[GT3M2]

Originally Posted by jhall1957

Do you track your car? I assume a square tire/wheel setup.

Road Atlanta this weekend

-GT3M2

[gcmak]

Originally Posted by GT3M2

This in combination with cheaper tires, more sidewall, smaller overall wheel size, less weight, less inertia all are geared towards improving hard driving/track driving experience.

Car would look 200% better dropped on 20's but, for the track, I think this is " the way".

19's are not much of a compromise but having so much space is nice.

-GT3M2

I follow your thought process.
Was just sharing data for others to review as they consider options. Contact patch shape and top speeds in each gear are considerations too; splitting hairs IMO but factors nonetheless.

[eagletangogreen]

Hey guys this is my “Blu Pig”

19x10 apex on MCS coils

Anyone with 18x10.5 can you post a picture of the caliper clearance?

Was going to do RA this weekend but it’s going to cold and raining, haven’t driven the car on track with the new msc coils. This is a dedicated track car I don’t drive it on the street because #raceseats

[ZPD]

Originally Posted by eagletangogreen

Hey guys this is my “Blu Pig”

19x10 apex on MCS coils

Anyone with 18x10.5 can you post a picture of the caliper clearance?

Was going to do RA this weekend but it’s going to cold and raining, haven’t driven the car on track with the new msc coils. This is a dedicated track car I don’t drive it on the street because #raceseats

Sweet setup! I just ordered a set of MCS 3-ways the other day and the first wave of parts started to show up today! What spings did you get? I have 800lb in the front and 700lb in the rear. How much space is there between your reservoirs and the hood? I am glad to see they fit there.

[eagletangogreen]

Originally Posted by ZPD

Sweet setup! I just ordered a set of MCS 3-ways the other day and the first wave of parts started to show up today! What spings did you get? I have 800lb in the front and 700lb in the rear. How much space is there between your reservoirs and the hood? I am glad to see they fit there.

Im starting out with 800 and 700 also and will go from there. Ill have to check but you basically have to put them where I put mine so they clear, but plenty of room.