How you guys liking the Ferodo DS3.12?

[NYG]

Originally Posted by Intensemojo

I've been running a 9668 front with 3.12 pads. stock rear brakes with 3.12.

I went to Road America last week and going into 1, 5, and Canada, the car dances a lot under braking. So much so, that I find myself not taking the ideal line to give myself some room to manage the car in the braking zones. I am set on increasing compression in the front and buying 9449 in the rear to settle the car more. What I cannot decide on is pad choice. Some say I should get more braking done in the rear, like a 3.12 rear and 1.11 in the front. Thoughts?

Different compounds usually wont make a big difference unless you have adjustable bias and super stiff springs.

What are your alignment specs and are you running the stock bushings?

[Intensemojo]

-3 in the front. -2.5 in the rear
Ohlins with camber plates
Fall Line toe links
Stock bushings
Apex sm10 10&11" 275/305 RS4 tires

So I thought I'd increase the front by a few clicks but as the Ohlins are single adjustable I am also increasing rebound.

[NYG]

Originally Posted by Intensemojo

-3 in the front. -2.5 in the rear
Ohlins with camber plates
Fall Line toe links
Stock bushings
Apex sm10 10&11" 275/305 RS4 tires

So I thought I'd increase the front by a few clicks but as the Ohlins are single adjustable I am also increasing rebound.

Do you know the front caster and front/rear toe? These two would be relevant.

[SYT_Shadow]

Originally Posted by Intensemojo

I've been running a 9668 front with 3.12 pads. stock rear brakes with 3.12.

I went to Road America last week and going into 1, 5, and Canada, the car dances a lot under braking. So much so, that I find myself not taking the ideal line to give myself some room to manage the car in the braking zones. I am set on increasing compression in the front and buying 9449 in the rear to settle the car more. What I cannot decide on is pad choice. Some say I should get more braking done in the rear, like a 3.12 rear and 1.11 in the front. Thoughts?

You really want to move bias to the rear, around 10%

Some BBKs have this built in, but it seems like the AP RadiCal uses the same bias as stock. In that case, you are left to your own devices and have to 'do it yourself'

[fanatic1]

Originally Posted by Intensemojo

I've been running a 9668 front with 3.12 pads. stock rear brakes with 3.12.

I went to Road America last week and going into 1, 5, and Canada, the car dances a lot under braking. So much so, that I find myself not taking the ideal line to give myself some room to manage the car in the braking zones. I am set on increasing compression in the front and buying 9449 in the rear to settle the car more. What I cannot decide on is pad choice. Some say I should get more braking done in the rear, like a 3.12 rear and 1.11 in the front. Thoughts?

BBK front and stock rear calipers and had good results experimenting with DS1.11 front and DSUNO rear. Pulled brake balance rear, but at the expense of excess heat on stock rear system.

Best to try this with BBK F&R.

Maybe someone else can weigh in here

[RSXDC5]

Originally Posted by Intensemojo

I've been running a 9668 front with 3.12 pads. stock rear brakes with 3.12.

I went to Road America last week and going into 1, 5, and Canada, the car dances a lot under braking. So much so, that I find myself not taking the ideal line to give myself some room to manage the car in the braking zones. I am set on increasing compression in the front and buying 9449 in the rear to settle the car more. What I cannot decide on is pad choice. Some say I should get more braking done in the rear, like a 3.12 rear and 1.11 in the front. Thoughts?

Are your front control arm bushings stock? I had the same braking issues with sticky tires/race pads...the Bimmerworld sealed front monoball bushings stopped this entirely. Highly recommend.

[Intensemojo]

That's interesting. I was thinking about picking those up.

I'll look up caster numbers and report back. appreciate the replies.

[RSXDC5]

Originally Posted by Intensemojo

That's interesting. I was thinking about picking those up.

I'll look up caster numbers and report back. appreciate the replies.

I believe they are the stock caster offset (no offset)...also no NVH gain that I can tell. This was a no-downsides mod for me, which also helped with on-limit "feel" out of the front end. It went from vague to direct, and inspired confidence when u push on track

In the same vein, if you have dancing from the rear under hard acceleration, rear toe arms fix that! I grabbed the SPL w/ Eccentric lockout.

[Intensemojo]

added rear AP 9449 this week and dinan front monoballs. will be running 3.12 pads all the way around for an upcoming June 7th track day.

hopefully it all helps with settling the car.

[fanatic1]

Originally Posted by Intensemojo

added rear AP 9449 this week and dinan front monoballs. will be running 3.12 pads all the way around for an upcoming June 7th track day.

hopefully it all helps with settling the car.

Really like the 3.12 just don’t forget to rotate them and you will greatly extend their life

[Intensemojo]

Like left to right?

[biofluke]

Originally Posted by fanatic1

Really like the 3.12 just don’t forget to rotate them and you will greatly extend their life

Sometimes when I rotate my 3.12 I get some shuttering for a few sessions. It's strange because it's only at 30-60% brake pressure. When I go full-on brakes, It doesn't shutter. It usually goes away after a few sessions, but it's not very confidence-inspiring. I've started marking which pad came from which corner, and they do seem to wear pretty evenly.

[fanatic1]

Originally Posted by Intensemojo

Like left to right?

Also inside to outside, outboard pad seems to wear quicker

[bimmerboyE92]

Originally Posted by Intensemojo

I've been running a 9668 front with 3.12 pads. stock rear brakes with 3.12.

I went to Road America last week and going into 1, 5, and Canada, the car dances a lot under braking. So much so, that I find myself not taking the ideal line to give myself some room to manage the car in the braking zones. I am set on increasing compression in the front and buying 9449 in the rear to settle the car more. What I cannot decide on is pad choice. Some say I should get more braking done in the rear, like a 3.12 rear and 1.11 in the front. Thoughts?

We went 9668/9449 right off the hop. With 350/600 springs on TCK DAs.... the rear moved around a lot. Even a resident pro at NCM commented that the brakes out perform the chassis. The only thing that worked was increasing rear toe to 3/16” in total. Still moves but is very drives me even under max braking.

[Driver407]

Originally Posted by bimmerboyE92

We went 9668/9449 right off the hop. With 350/600 springs on TCK DAs.... the rear moved around a lot. Even a resident pro at NCM commented that the brakes out perform the chassis. The only thing that worked was increasing rear toe to 3/16” in total. Still moves but is very drives me even under max braking.

Ive seen your build journal. We are similar builds. Ill have to look out for this on my trackday this weekend. Got my hands on a set of 9660's, installing tomorrow. Will be running 1.11 tho. I also have TC Kline with the same spring rates as you and already have the 3/16 toe per the TCKline spec sheet. What settings/clicks do you run on coils?

[bimmerboyE92]

The 295 and 315 tire sizes really made the car neutral. It was a pushy f-in b*tch before.

Front is 1-1/4 reb and 7 click from soft comp
Rear 2-0 reb and 7 clicks from soft comp ( TC spec is 10). But the car actually turns with the front tires now and the rear rotates!

And although the spec sheet says 3/16”, TC installed the coil overs and put in 1/8” and runs 1/8” on his F8X cars including the GTS that he just sold.

One of these days Id like to put a jack under the rear and go up 1.5” and then measure toe. I bet it goes to zero. If that’s the case, maybe 1/4” toe is the answer.

[EGbeater]

Looking for feedback from anyone who has run the Ferodo 3.12 compound on the OEM (steel rotor) setup... about to switch to the 3.12s F&R from PFC08s on my '16 F80, and a friend just got back from a track day with his 991 GT3 running the 3.12s... anyone ever seen a crazy rotor wear pattern like this? This is the front rotor:

[NYG]

Originally Posted by EGbeater

Looking for feedback from anyone who has run the Ferodo 3.12 compound on the OEM (steel rotor) setup... about to switch to the 3.12s F&R from PFC08s on my '16 F80, and a friend just got back from a track day with his 991 GT3 running the 3.12s... anyone ever seen a crazy rotor wear pattern like this? This is the front rotor:

Yeah - I remember having unusual wear on the rotors of my AP 9660 kit.

The reason for it is because brake dust builds up in the vent holes which makes the rotor face not perfectly level. They say it's no cause for concern.

[EGbeater]

Originally Posted by NYG

Yeah - I remember having unusual wear on the rotors of my AP 9660 kit.

The reason for it is because brake dust builds up in the vent holes which makes the rotor face not perfectly level. They say it's no cause for concern.

Thank you NYG; I don't doubt the "striped" wear pattern is due to the drilled holes, but I have not seen anything like this on my OEM drilled rotors (front or rear) on my F80, having tracked it repeatedly with PFC08s over a couple seasons and gotten the brakes very hot (my front calipers have turned nearly completely murky dark-green/dark gray)... maybe with a more aggressive (higher mu) pad compound on drilled rotors, this concentric-ring wear will happen?

[NYG]

Originally Posted by EGbeater

Thank you NYG; I don't doubt the "striped" wear pattern is due to the drilled holes, but I have not seen anything like this on my OEM drilled rotors (front or rear) on my F80, having tracked it repeatedly with PFC08s over a couple seasons and gotten the brakes very hot (my front calipers have turned nearly completely murky dark-green/dark gray)... maybe with a more aggressive (higher mu) pad compound on drilled rotors, this concentric-ring wear will happen?

I think there has to be the right scenario for enough dust to build up and the right temperature for the pad to start developing a small groove around those points. Not sure to be honest but I know it's not abnormal.

[D_SheerDrivingPleasure]

Midway through an event yesterday I replaced my semi-worn PFC11 front pads with fresh DS3.12's. The rear pads (PFC 11s) still had lots of material and didn't need to be replaced. Back on the track I noticed a marked increase in initial bite which put the car off balance if I wasn’t gentle. I’m worried that I shifted the brake bias to the front. Is it clear that the strong initial bite is due to the aggressive nature of the DS3.12 compound? Or, I am just experiencing a normal reduction in pedal travel/knockback from having fresh pads? The brakes are stock except for giros, racing brake pistons/seals and removed dust shields.

[D_SheerDrivingPleasure]

@EGbeater How deep are those ridges on your rotors? Can you feel them when your run a finger over the rotor?