Big Brake Upgrade For Gtr

[T04GTR]

excelent. this compliments my topic on master cylinders.

ive got some ktype alcons on the front

and ap 4 pots on the rear.

origonaly i had f40s. (38mm/44mm) same as porche big reds. 340mm rotor

on 355 and 330 respectivly. now they work realllllly well i can go flat out thrue the kink a wakie no problems. (about 220k) and it pulles up strait and fast.

now i recently changed to the alcons. (piecing together my f40 kit so i can sell it) these run larger pistons. (more leverage) they woprk great buy now i find the fronts are working to hard and there isnt enough going to the rears. (FRONTS BRIGHT ORANGE AND REARS NOT EVAN RED)

my point here is that the 1 inch master on a 32r is great. if only it didnt have the proportioning valve in it. an external one would be the shissel. does a 300xz one have it built in? and its bigger. 27.88 or somehting.

i was looking thru the prb book and theres alot of nissans running 25.4 (1 inch) masters. i just need to find a ilistrated book. or go to the wreckers and rumage thru the box. lol.

seems a few peeps seem to think that the factory pressures are wrong. but its the valve thats the issue. and f**k putting a pedal box with a balance bar in lol.

(and on the v8 supercar. welll sorted,, 5/8 ap cylinders pull type) sbr001 ba coon) the balance bar is alllllll the way over one side to ge the reqired 800ps1/600psi split. prettu usless i rekon.

[T04GTR]

no more latent heat issues eith. orange hot disc and no fade what so ever. mmmm titanium

or and that brembo lables ment to be white. now its dark blown lol the alcons came with knockback springs on the trailing piston. (large one) slight squeek but that it

[Sydneykid]

(and on the v8 supercar. welll sorted,, 5/8 ap cylinders pull type) sbr001 ba coon) the balance bar is alllllll the way over one side to ge the reqired 800ps1/600psi split. prettu usless i rekon.

If it's front bias, then you have the "endurance race" rear master cylinder in it to allow for the fuel load. Change to the "sprint race" rear master cylinder and you won't have that problem.

cheers

[T04GTR]

hrmmm well that stayd in the same spot the whole time lol. albeit development series. anyway im off to get more discs doh. i cracked one. not happy jan. and the knockback springs dont make it any better. grrrrrrr

[T04GTR]

oh well i had to get some alcon discs and new hats. they will be great. but yeah..

[sav man]

you get floating hats?

I think my calipers have knock back springs, as i can always hear the pad's rubbing. I still get bad knock off, i'm hoping a bigger master cylinder will make it a bit better.

[Roy]

Have you measured what sort of run out you are getting on the rotor? Is it worthwhile removing the rotor and rubbing back any scale/buildup on the hub?

[T04GTR]

yeah. i cleaned the hub properly. ie no rust at all!!!!!! and had them machined. i think it must be wheel bearings cos its only on cornering.

[dontfeelcold]

Just curious to know what people are paying for rotors (just the rotors, not hats) be it AP, Brembo, DBA500 etc and in what size?

[Roy]

It depends a lot on model of rotor and thickness.

In my experience Brembo rotors are the most expensive, with a 355x32mm rotor being around the $650 each.

[STATUS]

yeah. i cleaned the hub properly. ie no rust at all!!!!!! and had them machined. i think it must be wheel bearings cos its only on cornering.

is it definalely front causing the knock back? i have had the GTR and my old R32 do the same thing in the hills on me and it turned out to be rear hub bearings knocking the rear pads back in the caliper.... and it only happened initially when giving it stick in the hills or on the track.

[[200]]

Has anyone heard any reviews on the Project Mu calipers? For an S15 they have 4 pots on 345 x 32mm rotors. The pack with brake lines, adapters and brake pads was $3700 local. Probably cheaper overseas.

I'm in the market for a brake upgrade...

[phunky_monkey]

I think Troy (Roy on here) was looking into Project Mu calipers, try pm'ing him.

I haven't heard anything about them, but I love their discs and pads. Can't speak highly enough of them

[sh@un]

As usual, the tyres are the limiting factor. Past experience has taught me that a set of properly maintained standard R32GTR brakes with decent pads and fluid will outstop any road tyre.

That i can vouch for; The std brakes on my old 260rwkW R32 GT-R never got anywhere near to giving up at either The Creek, Oran or Wakefield, whereas the Falken *cough* Ziex's *cough* had well and truly had enough after about, oh, a lap and a half.

save on brakes- buy shite tyres. lol

(sorry for thread mining )

[T04GTR]

lol@ thread bump..

oh. a good trick is to use a gq patrol master cyl. no proportoning valve. 1 1/16" bore. combined with a bias valve for the rear it works really well.

all bolts up, just swap the resovior.

[Duncan]

good call thanks Dave. that solves my little problem