Need Some Help From An R32 V-spec Gt-r Owner.

[djr81]

I am after a photo of the brake master cylinder from a V-Spec R32 Gt-R.

This is one from the povvo pack GT-R.

I need to do a compare & contrast.

Thanks in advance.

[Duncan]

if it helps 33 master is different (longer) and not a great fit in a 32. But I guess you are wondering about diameter?

[djr81]

if it helps 33 master is different (longer) and not a great fit in a 32. But I guess you are wondering about diameter?

33 one looks like the photo below.

I am just trying to determine what the 32 version looks like so I can be sure I get suffient parts if/when I change it over.

Either that or I will have to get an AP unit or similar.

Diamter is sorted R32 = 25.4mm, 33 = 26.9mm

[sav man]

I though R32 V-Spec and R33 m/s were the same? I know the cusco m/s stopper don't fit a R32 V-Spec (according to the notes on sites that sell them)

[djr81]

I though R32 V-Spec and R33 m/s were the same? I know the cusco m/s stopper don't fit a R32 V-Spec (according to the notes on sites that sell them)

From the little I can make out on shots of R32 V-Spec engine bays the master cylinder arrangement looks to be different to the 33's.

Surely someone out there must have a photo?

[djr81]

Cmon fellas, someone in this world must have a V-Spec and a camera.

[E33]

Will take a pic when I get the car back from the mechanic

[sav man]

I just put a R33 GT-R V-Spec (V-Spec shouldn't make a diff on R33) master cylinder on my car. The external dimensions are identical to the pov pack R32 GT-R, the only difference is that the warning plug is different.

[djr81]

I just put a R33 GT-R V-Spec (V-Spec shouldn't make a diff on R33) master cylinder on my car. The external dimensions are identical to the pov pack R32 GT-R, the only difference is that the warning plug is different.

That is usefull info. For some reason when you look at the brake stoppers as offered by Cusco etc they appear to differentiate between the Brembo & non Brembo Gt-R's. No idea why.

Anyway this is what little I have been able to find out.

Brake master cylinders for R32 Gt-R's.

Part numbers are stamped on the end of the master cylinder. There appears to have been two different part numbers available for most build dates. This may be as simple as Nissan sourcing master cylinders from two different manufacturers - Tokico & Nabco.

Stock model:

Build dates from 8908 to 8911

Part number 46010-05U20

Size 1"

Build dates from 8911 to 9108

Part number 46010-05U00

Size 1"

Build dates from 9108 on

Part number 46010-05U20

Part number 46010-05U00

Size 1"

V-Spec model, ie with Brembo brakes.

Build dates from 9302 on

Part number 46010-05U02

Size 17/16's.

N1 versions.

This gets confusing & may well be incomplete.

Early version appear to have 15/16" master cylinder sizes. I would guess (Note: NOT SURE) that they may well have three outlets rather than the normal two for stock GT-R's & have Sumitomo callipers. The number of ports relates to the presence of ABS. 2 ports for ABS, 3 for Non ABS. n Interestingly they appear to be smaller in size than their equivalent ABS equipped stock or V-spec GT-R's.

Any way:

Build dates 9002 to 9108

Part number 46010-02U00

Build date 9108 on

Part number 46010-02U00

The specification is listed differently for these units but is in Japanese on the spec sheet & I can't read it.

The alternate parts listed are here

Build dates 9002 to 9108

Part number 46010-02U20

Build date 9108 on

Part number 46010-02U20

Later versions had a 1" size.

Build date 9203 on

Part number 46010-05U01 for a Tokico unit.

Part number 46010-05U21 for a Nabco unit.

There may well be more options but that is the limit of my knowledge at present.

Edited August 29, 2008 by djr81

[LotusGTR]

Sorry if this is a little off topic, but I have a leaky master on my povo pack R32 GTR. I'd like to get it reconditioned, but don't want to do so if it is too small for a 'big brake' upgrade. I'm being told that the R32 V spec / R33 1 1/16 would be better suited for larger piston areas. I'm also being told (on the other contradictory hand) don't bother, the std 1" master will be fine, just get it reco'ed and away you go, std brakes / big brakes doesn't matter.

Any thoughts?

Cheers.

[djr81]

You need to first sort out what callipers you want to run & whether you still want ABS before you select a brake master cylinder.

Keep in mind the Sumitomo calliper has (relative to most other brands other than Brembo) a large piston area.

[LotusGTR]

You need to first sort out what callipers you want to run & whether you still want ABS before you select a brake master cylinder.

Keep in mind the Sumitomo calliper has (relative to most other brands other than Brembo) a large piston area.

Calipers are very likely to be Alcon 6 pots. I guess I should get the Alcon piston area stats and compare to the Sumitomos right?