Big brakes big caliper and rotors.

deleted_user_160 · 2014-05-19T10:48:40+00:00

@AshDVS , He is the barking Dude here. Has kits , can get kits and úber pads....

Ex850R

Dual caliper bracket using 850 calipers?x70...

You get em for rears for drift so why not front?

deleted_user_160

Hahaha! Badass idea.
Ever increasing unsprung mass.
Would prob find a quality large surface area caliper be more effective.

AshDVS

blondejay;20699 wroteHahaha! Badass idea.
Ever increasing unsprung mass.
Would prob find a quality large surface area caliper be more effective.

This is actually a VERY valid point.
Shortly we'll have our 320mm brake upgrade available for the P80 (ie 850, C70/S70/V70 up to 2000) which sees the standard caliper (which is rubbish) and 280mm rotor (or 302mm for V70R models) replaced with the caliper and 320mm rotor from a LS-LV Ford Focus XR5 (or new C30/S40/V50 T5 models).

The 320mm rotors weigh just under 10kg each!!!
You could reduce this a lot with a two piece rotor and hat, the question becomes about whether the masses are willing to pay for it. If you're paying for a two piece rotor and hat, its probably worth paying for a 'real' caliper too - Focus caliper is still a sliding design.

deleted_user_160

By slide type, you mean the static/active caliper. Single sided actuation?

AshDVS

Correct.

Ex850R

So Ash , you should be making dual caliper mounts instead to save all that unsprung mass with the big discs?!

AshDVS

I don't really like dual caliper arrangements. The mounting is often a bit clumsy and plumbing and bleeding can be a nightmare.
a decent aluminum caliper and two-piece hat and rotor is the way to go of unsprung weight is a c oncern.

Despite the weight, the focus setup is very good on an 850 given the caliper design.
I may play with a hat and rotor on my car. I think I can get a suitable 320mm rotor so just need to draw up a hat and get it made. Depending on cost, that may or may not be worthwhile.

deleted_user_160

Who does your cnc work? If need be I've got my tool maker in brizvegas.

That focus setup, is it compatable with the 7series?

Philia_Bear

calvintibia001;20679 wroteBut seems XC90 brakes are decently cheap, only problem with XC90 brakes are there is not much performance disc out there

???

For the 336mm
Can easily and cheaply get slotted or drilled or slotted&drilled
Pad choice range is excellent as well including the police spec ones

calvintibia001

Philia_Bear;20745 wrote
calvintibia001;20679 wroteBut seems XC90 brakes are decently cheap, only problem with XC90 brakes are there is not much performance disc out there
???

For the 336mm
Can easily and cheaply get slotted or drilled or slotted&drilled
Pad choice range is excellent as well including the police spec ones

Hmmmm, maybe just me being blind. Have you tried fitting on a 240/740/940 yet ?

Philia_Bear

they fit fine on 240, just going to require large-ish wheels to clear
The stock brakes just look puny by comparison
The weight is however way up there

deleted_user_160

Hmmm, wonder if they will fit the 7 then?
But with 17's clearance will still be the concern correct?

AshDVS

blondejay;20740 wroteWho does your cnc work? If need be I've got my tool maker in brizvegas.

That focus setup, is it compatible with the 7series?

We're about to do a first 'real' volume run with our new place - I'll pass on details if you want them, if they prove to be good to deal with.
The place we had been using unexpectedly closed their doors.

Philia_Bear;20745 wrote
calvintibia001;20679 wroteBut seems XC90 brakes are decently cheap, only problem with XC90 brakes are there is not much performance disc out there
???

For the 336mm
Can easily and cheaply get slotted or drilled or slotted&drilled
Pad choice range is excellent as well including the police spec ones

Avoid drilled rotors on a road car.
Slotted are fine, but I wouldn't touch drilled.

Philia_Bear;20815 wrotethey fit fine on 240, just going to require large-ish wheels to clear
The stock brakes just look puny by comparison
The weight is however way up there

As you'd expect, I suppose. probably 10.5 or so kg each if they're an ATE or Brembo rotor I'd guess?

deleted_user_160

@ashdvs your brembo's in comps reason to factory 7/9 series what's the size/set up?

deleted_user_160

@ashdvs your brembo's in comps reason to factory 7/9 series what's the size/set up?

Spac

+500 on the "avoid drilled rotors" comment.

Ex850R

zIts been said so many times "avoid drilled rotors" but no one says why??

deleted_user_160

I was about to ask the same thing. My theory would be, that road set up is generally not checked as often. There is also tonnes more junk on the road, than track

egads (she/her)

Cracks on extreme heat cycles out from the holes.

Google image search cracked drilled rotors to get an idea what I mean.

Spac

Drilled rotors always crack - even in moderate use. It may be possible to drive softly enough to avoid it, but what's the point in that?

As best as I can tell, it's caused by the outer surface being much cooler at the holes.
Drilled rotors are rarely used in race cars, but when they are, they have a LOT more holes than the drilled rotors you can buy for road cars. IIRC, it's about the ratio of surface area in the walls of the hole vs surface area removed.
Also, they only seem to be used on endurance racing cars, where the rotors aren't expected to endure many heat cycles.

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