33 GTS25t brakes on 32 GTSt

[Chris32]

I want to swap my front brakes for R33 brakes, I have a few questiosn that hopefully I can get a few answers on -

1) Is it just a case of swapping the calipers and rotors for the R33 ones?

2) Will the stock R32 master cylinder be ok

3) What rotors should I run - new stock or something a little better - will be using Racebrakes RB74 pads

4) Will they fit behind the standard rims?

5) Is there any other things I haven't thought of?

Chris

[Roy]

Some info on brakes, master cyliners and rotors

R32 GTST

Master Cylinder diam (mm) - 25.4

Front Caliper Piston(diam x qty) - 40.4 ×4

Front rotors (diam x thk) - 280×30

Rear Caliper Piston(diam x qty) - 38.18×2

Rear Rotors (diam x thk) - 297×18

R33 GTST

Master Cylinder diam (mm) - 23.8

Front Caliper Piston(diam x qty) - 40.4 ×4

Front rotors (diam x thk) - 296×30

Rear Caliper Piston(diam x qty) - 38.18×2

Rear Rotors (diam x thk) - 297×18

Now the interesting bit...

R32 GTR (Non V-Spec,)

Master Cylinder diam (mm) - 25.4

Front Caliper Piston(diam x qty) - 40.4 ×4

Front rotors (diam x thk) - 296×32

Rear Caliper Piston(diam x qty) - 38.18×2

Rear Rotors (diam x thk) - 297×18

R32 GTR V-Spec / R33 / 34 GTR with Brembos

Master Cylinder diam (mm) - 26.9

Front Caliper Piston(diam x qty) - (44+38)×2 ... leading pistons larger then trailing

Front rotors (diam x thk) - 324×30

Rear Caliper Piston(diam x qty) - 40×2

Rear Rotors (diam x thk) - 300×22

So there isnt much difference between the Brembos and the std Nissan R32/33 GTST calipers and R32 GTR calipers.

If you want a brake upgrade id say go grab some DBA4000 meant for ther GTR , which are 324 x 30mm ...(DBA5000 if you can afford them) All you will need is a bracket to offset the caliper to suit the larger rotor.

Id stick with the std R32 GTST calipers. R33 calipers look better but hardware wise i think you will find they do the exact same job:)

[Chris32]

Cheers for the info mate, the big thing for me is that they HAVE to fit under my 16" P1's, other wise there is no point me upgrading.

The main reason I want to go for the 33GTS calipers is so I run the bigger disk without fouling the rim, and being that bit bigger, hopefully they will do a decent enough job

Currently I am running some type of slotted rotor and racebrake RB74 pads, they work well, but I think with a bit more grunt and a upcoming driver training/track day early december, something a bit more substantial is required

What do you reckon?

[RiverSide]

O would not see any issues fitting the R33 brakes behind your 16" rims........R33's came stock with 16's, depending on the offset of your P1's you may require small spacers, simple fix.

If you do go ahead with this i would be interested in purchasing your R32 discs and calipers.

Cheers

[Chris32]

O would not see any issues fitting the R33 brakes behind your 16" rims........R33's came stock with 16's, depending on the offset of your P1's you may require small spacers, simple fix.

If you do go ahead with this i would be interested in purchasing your R32 discs and calipers.

Cheers

I will be going ahead with this, as I have already found some calipers and paid a deposit, just need to know if its going to be a simple task

PM me if you want mine and we can sort something out,

regards, Chris

[David Kemps]

What effect does the different diameter of the master cylinder have on the brakes?

[Roy]

Id use DBA 296mm rotors. The R32 GTST caliper is the same as the R33 GTST caliper isnt it. If it bolts to the hub and automatcally clears the larger rotot then fair enough, but im not sure if that will be the case. Intersting to see if the hub is different or the wings of the caliper are different

Larger master cylinder means the piston is bigger, sdo for say 10mm movement pisplaces more brake fluid so in theory should equate to a little more pressue in the lines?!?! I think, not 1000% sure

[Chris32]

I know that the R32 caliper will not accept a 296mm rotor, tried that already from what I can see, the R33 caliper is mounted up a little more to make room for a bigger rotor

From what I can gather of the wrecker I am getting them of, its a simple case of unbolting the 32 calipers, put the 33 disc on and caliper and that should be it

I reckon you are pretty spot in re master cylinder stuff

Chris

[David Kemps]

Roy: 297mm rear rotor for the GTST's....this must be incorrect

Dave

[Roy]

:confused: havenbt measure mine...bu the listing i have says they are 297mm?!?!?! They are a pi55y 18mm thk though

[Chris32]

I am pretty sure that is correct for the rear brakes, 297mm looks about right

[Roy]

LOL...forget read brakes.How did the tune go:) My car wasnt ready to pick up:( Still have to do a bit more tuning apparantly:(

[Roy]

LOL...forget read brakes.How did the tune go:) My car wasnt ready to pick up:(

They still werent all that happy with the tune and needed a bit more work,i suppose there is not point rushing them if you want it doen right

[Chris32]

They are bolting everything back on now, pipes and other shit, and tune is happening now I spose. I am leaving here in about 40 mins to go and hopefully see the final tuning etc and drive it home, Shaun reckons it should be all done by about 7ish, as they have to get the car out to make way for a few more booked in for tomorrow

Bummer about your car, at least they are not giving it to you until they are happy with it, should be great mate!

[DLuded]

any idea as to how much r33 front calipers cost as i already have the front discs

[David Kemps]

the rear brakes can't be bigger than the front

[Roy]

Mine arent but i got 330 fronts. Why cant they be bigger then the fronts?

[Roy]

Mine arent but i got 330 fronts.

[David Kemps]

well, i was pretty sure they weren't bigger, you could be right, ill measure on the weekend

[mist]

the rear disc size is 297mm as Roy says hehe

btw, R32 GT-R discs have angled cooling vanes in the middle, compared to the straight vanes of R32/R33 GTS-T discs. That, combined with its extra thickness and 296mm size, gives it better performance over extended track sessions (>10 laps). The R32 GT-R caliper is physically bigger than the R32 GTS-T's caliper, similar size to R33 GTS-T but slightly different design.