scoobyJim2

Hey all! Im looking into getting new front brake set-up for my 320bhp which hopefully is soon to be 400bhp 2004 wrx. The 294mm discs with subaru 4pots give me fade after one very heavy stop (tried various pads & discs) Some manufacturers do 300mm upto 400mm discs with 4,6 or 8 piston calipers. Dont want gold brembo 4pots with 330mm discs because think they would probably fade too. What im asking is how big a disc and how many pistons in caliper can go without changing rear brakes and affecting bias. I want the 400s I have 18" wheels

jura11

iTrader: (7)

Hi there

Brembo combination with right discs and pads can be great upgrade and they will no fade with right discs and pads combo

I would suggest you speak with Alyn@AS Performance about the options for Brembo

We are running 8 pots front with 356mm and 6pots rear with 330mm and think balance is perfect,some guys running 356mm with Brembo 2pots at rear and everything is fine

You can have 6 or 8 pots brakes,but if you are using wrong pads and wrong brake fluid,you can suffer same issue(brake fade) with 6/8 pots too

Due this I would recommend and suggest speak with Alyn@AS Performance

Jura

ditchmyster

iTrader: (7)

If it's a road car at 320bhp it would be fine with the RIGHT pad and disc combo.

I have AP 4pots godspeed discs and ds2500 pads which is more than enough for road and track use, but if I was doing track days I'd go for a track focused pad.

As above speak to Alyn @as performance or Ian @ godspeed brakes.

Henrik

iTrader: (5)

I think the k-sports (330mm) option is sensible value, and they are not unnecessarily heavy. I've ran other combos in the past, and I can definitely tell the weight difference over pot holes etc, where the car is noticeably less jittery over rough bits. They also fit under standard wheels.

However, having said that, I think there must be something wrong with your four pot setup if you get fade after one brake. What pads/discs combos have you tried, and have you got fresh fluid?

Fudgey

iTrader: (1)

AP Racing CP5200 4 pots with 330mm discs will be a massive improvement over what you have, or if your budget can stretch to it
AP Racing CP7040 6 pots with 355 or 360mm discs.

you will be hard pressed to find a better price than here:

http://www.reyland.co.uk/subaru-impezza/

1509joe

iTrader: (2)

XYZ are a good upgrade fit on standard 17" wheels with the proper offset. Reasonable price too and I think you get braided lines as well.

scoobyJim2

I used to have 294mm drilled brembo discs & performance friction carbon metallic pads which absolutely ruined the brembo discs within few months (which also faded easy) and seeing as my brakes are 4pot same as brembo I wonder if brembo calipers & 330mm discs can be much better

scoobyJim2

I heard big discs deal with heat therefore less fade?

tubbytommy

iTrader: (20)

brembos with decent pads will handle 400 bhp easily, "i heard" is the route to expensive cockups.

anything over 356mm will require bigger than 18 inch wheels.


what mods are you doing to get a wrx upto 400bhp as this is an expensive route to go on a wrx

scoobyJim2

The best way to describe my needs I suppose is I need a set of brakes that will handle a lot of stops where I accelerate from 50mph to about 100mph then brake very hard back to say 50mph and do this a good few times without fading

scoobyJim2

I do admit I want to change fluid (want to do it when i change calipers though) I did have it tested at a garage and boiling point was still good. Am interested in k-sports,think they're the ones that go to 400mm discs but i would be happy with 350ish if 400mm is to much. Had ebc grooved with yellow stuff pads.brembo drilled with performance friction carbon metallic,both faded so for now I got oe discs with black Diamond predator pads (which seem just as good). I got sick of spending hundreds and getting same issue.

scoobyJim2

Thanks for link,will have a look

scoobyJim2

I'll look into them,thanks

scoobyJim2

Without sounding rude I have to hear my knowledge from somewhere,like asking on here I thought all the big brakes fit under 18s? Dont want to change rear brakes really but dont want to mess braking system if thats possible by going too big on the front. 356 sounds ok,better than 330,how many pot caliper with 356 disc,does it make difference?

tubbytommy

iTrader: (20)

400s wont fit under 18s, 356mm only just clear.

scoobyJim2

Engine is built very strong all uprated internals. Mods are 550 pink injectors,front mount ic,vf35 turbo,induction kit and full exhaust including uppipe.been mapped already to 320bhp before I bought it,since then I've had engine and gearbox work done. I just need good mapper to discuss the power upgrade with what I've already got,doesnt have to be 400bhp,another 50bhp would do! Wouldnt mind a few things done with map like maybe a bit of launch control and some spitting & spluttering here n there lol

Tidgy

http://shop.scoobyclinic.com/index.p...product_id=521

tubbytommy

iTrader: (20)

you wont get 400 on a vf35, you will also need a 6 speed box and new injectors.

what uprated internals does it have?

scoobyJim2

Ok thanks. 356 is ok,how many pistons 6 or 8

JGlanzaV

iTrader: (3)

330mm will stop you just fine with some decent pads and fluid,

Fudgey

iTrader: (1)

He wont "need" a 6-speed....

Just lots of 5-speed's lol.

All depends on how you drive the car really.
If you launch it at every opportunity then nothing will last long.

Fudgey

iTrader: (1)

Have a look at the reyland link i posted, 330mm 4-pots
355 and over 6-pots.

But the AP's are far superior to ksport/d2/xyz and even the sti brembo's imo.

Having driven cars with the 330mm AP 4-pots the brakes were awesome, and the 6-pots were just brutal!

Yes they cost more... But there is a reason for that....

scoobyJim2

How much bhp do you think vf35 is capable of? My wastegate goes crazy bleeding the boost when on the loud pedal,I reckon it could easy create upto 2bar. How much bar/psi do you think 400bhp would need?

scoobyJim2

I have a group n cryogenically frozen gearset in it

tubbytommy

iTrader: (20)

right another newb bellend, its the final straw for me.............laters

the marque is fooked now........

scoobyJim2

Why be offensive? Your right it is the first car I have ever had tuned but everyone's gotta start somewhere. I mearly told you my engine is strong and what mods it has and asked what kind of boost you think vf35 is capable of and how much would be needed for the kind of power im looking for

scoobyJim2

Anyway tubby this is a brake size thread,not a tuning one (although I do have a thread on the tuning if you'd like to put in your thoughts thanks) and someone like youself with 15415 posts should know better! Read my original question if you'd like to be of help please,cheers

Fudgey

iTrader: (1)

Unfortunatly 15414 of tommys posts have been utter toss/**** taking or just plain useless....

But hey, he said he has gone now so its ok LOL

gazney101

iTrader: (5)

Boost is not what it needs mate, it need to flow more air, for example your vf35 will flow a certain amount of air at 1.5bar but a 20g will flow more at 1.5bar, turbos reach a certain point where they exceed their compressors efficiency , the air that is being forced in is warmed by compression and is not substantial enough in mass to overcome its temperature issue therefore you would see a very small gain in power but reduce the life of your turbo and engine

scoobyJim2

Really? There is someone selling some ap 6pots on here