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Old 10-04-2009, 12:52 PM   #1
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What size z32 BMC

I have heard mixed opinion on what size bore z32 brake master cylinder I should run with my s13, which includes; FRONT: z32 4 pot 30 mm aluminum front brakes with porterfield pads,brembo blank rotors, steal braided brake lines REAR: stock calipers, porterfield pads, slotted dimpled rotors. This car will see the track as often as possible so i don't mind if its fairly aggresive, i have raced go karts in the past, which breaks lock up instantly with a bit a of extra pressure if that gives anyone anymore help.
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Old 10-04-2009, 12:59 PM   #2
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Doesn't matter really. As long as its a z32 BMC, it will be a great improvement over the stock 240 one.
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Old 10-04-2009, 01:09 PM   #3
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i know but there are quite a few different bores...
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Old 10-04-2009, 01:12 PM   #4
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Old 10-04-2009, 01:19 PM   #5
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mike said differently and BRIAN SAID YOU RUINED HIS LIFE
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Old 10-04-2009, 01:29 PM   #6
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well if you ever plan on upgrading to z32 rears in the future you might as well get a 17/16" now.
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Old 10-04-2009, 02:26 PM   #7
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Quote:
Originally Posted by mrchomponthis View Post
i know but there are quite a few different bores...
few? there are only two. 17/16 and 1 inch. Either one will work fine. The 17/16 is only 1/16 bigger so obviously not going to notice it a whole lot. So like I said as long as its a z32, you will be fine.
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Old 10-04-2009, 02:37 PM   #8
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The Definitive 300ZX Brake Swap!
46010-30P01 Manufacture date 2/89 – 7/90 (17/16" NA Tokico)
46010-30P02 Manufacture date 7/89 – 7/90 (17/16" TT Tokico)
46010-30P02 Manufacture date 7/90 – 2/91 (17/16" NA & TT Tokico)
46010-30P10 Manufacture date 2/89 – 7/90 (15/16" NA Nabco non-ABS)
46010-30P21 Manufacture date 2/89 – 7/90 (17/16" NA Nabco)
46010-30P22 Manufacture date 7/89 – 7/90 (17/16" TT Nabco)
46010-30P22 Manufacture date 7/90 – 2/91 (17/16" NA & TT Nabco)
46010-45P00 Manufacture date 9/91 – 9/93 (1" NA TT Tokico)
46010-45P00 Manufacture date 2/91 – 9/91 (1" NA & TT Tokico)
46010-45P20 Manufacture date 9/91 – 9/93 (1" NA & TT Nabco)
46010-45P20 Manufacture date 9/93 – Up (1" NA & TT Nabco)

hope this helps
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Old 10-04-2009, 03:14 PM   #9
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what bore should i run i am not going to swap the rears, and i i have seen 1 1/16, 15/16, 1'
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Old 10-04-2009, 03:28 PM   #10
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You can run an Auto S14 BMC and booster as well. I would just get the 17/16", if you ever do want to upgrade to the rears, it's already done. Make sure you get one with the fitting already installed.
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Old 10-04-2009, 03:40 PM   #11
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what fitting?
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Old 10-04-2009, 04:00 PM   #12
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that fitting.

if you are 100% sure you're never going to upgrade your rear brakes then a 1" will be fine. but still, might as well get a 17/16. it won't be that overly aggressive and you will get used to it quick, plus have the option to upgrade brakes later.
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Old 10-04-2009, 04:08 PM   #13
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so i saw some for pretty cheap online how do i know they have this fitting which i don't know what it is since this picture has no arrowwww
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that fitting.

if you are 100% sure you're never going to upgrade your rear brakes then a 1" will be fine. but still, might as well get a 17/16. it won't be that overly aggressive and you will get used to it quick, plus have the option to upgrade brakes later.
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Old 10-04-2009, 04:13 PM   #14
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The fitting is the one in the middle, I suggest you read up on The Definitive 300ZX Brake Swap!
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Old 10-04-2009, 04:20 PM   #15
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how do i get that fitting?
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Old 10-04-2009, 05:19 PM   #16
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The stock 7/8" BMC is alot more powerful then the Z32 1 1/16" BMC, some people dont like using the stock 7/8" BMC because it has more slop and over boost the brakes.

The 1" Z32 BMC is a good choice IMHO you can also use the 15/16" this is the size I ended up running, these will both give you less slop in the pedal and will require more leg effort to bring the car down to a stop.

The 1 1/16" BMC, I dont like this BMC for shit, the brake pedal is to damn stiff and you really have to get on the brake hard to bring the car down to a stop.

If your runing a dual diaphram brake booster like you should be in the first place the larger BMC works better. I know alot of people thing the biogger the BMC the better the brake, NOT!

BMC = Brake Master Cylinder

p.s. The Z32 used the 15/16", 1" and 1 1/16" throughout the years
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Old 10-04-2009, 05:29 PM   #17
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Damn, talk about spoon feeding the kid. Run what the s14 and s15 silvias do, BM50 (1"). I suggest upgrading your brake booster as well.
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Old 10-04-2009, 08:00 PM   #18
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if i buy a new bmc 1' will it come with the fittings?
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Old 10-04-2009, 08:19 PM   #19
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dude, have you not done an ounce of research? read the deffinite 300zx brake thread. seriously, shits been asked before and answered countless times.

Few to almost no z32 bmc will come with that fitting (15/16 will probably have it though as they were offered in non-abs cars).

Other option is a z31 bmc. It's 1", has the fitting, it's common, and fairly cheap.
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Old 10-04-2009, 08:27 PM   #20
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I believe if any are to have the fitting in the middle port it will be made by NABCO IIRC, I just sold a 1 1/16" that had the fitting and i believe it was also a NABCO unit but dont quote me.
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Old 10-04-2009, 08:27 PM   #21
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funny, im running a 17/16" Z32 MC and I fucking love the stiff pedal. Mind you the car was auto so it has the larger booster, but I wouldnt mind an even stiffer pedal.

Maybe I'll pickup a manual booster for even stiffer porsche-like pedal feeling............ ;-)


crazy to see that people DONT like stiff pedals. whats next, people are gonna complain about tight twats in the near future. god help us.
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Old 10-04-2009, 08:41 PM   #22
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look like also you can swap the fluid reservours from the stock BMC to the z32
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Old 10-04-2009, 08:45 PM   #23
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Quote:
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look like also you can swap the fluid reservours from the stock BMC to the z32
Yea you can and you should, I believe the tilt is different between the 2 chassis anyways IIRC.
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Old 10-04-2009, 08:47 PM   #24
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whats next, people are gonna complain about tight twats in the near future. god help us.
rofl!

on my hatch i run r33 brembos front and rear, dba 4000 rotors with hawk hps pads. i'm also using a 17/16 bmc with the manual booster and super blue.

honestly after the whole swap, and bedding in the pads, the pedal feels barely stiffer if not the same to me.

the car stops amazingly well though, i'm very pleased with the setup.
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Old 10-04-2009, 10:59 PM   #25
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rofl!

on my hatch i run r33 brembos front and rear, dba 4000 rotors with hawk hps pads. i'm also using a 17/16 bmc with the manual booster and super blue.

honestly after the whole swap, and bedding in the pads, the pedal feels barely stiffer if not the same to me.

the car stops amazingly well though, i'm very pleased with the setup.
awesome, show some pics.. ide love to see your setup

curious, does anyone know the size difference between the R33 front and rear rotors vs the Z32? Im curious and would like to keep that info in my database.

mike
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Old 10-04-2009, 11:20 PM   #26
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awesome, show some pics.. ide love to see your setup

curious, does anyone know the size difference between the R33 front and rear rotors vs the Z32? Im curious and would like to keep that info in my database.

mike
well i'm going to quote the dba catalog directly. there's tons of posts out there with incorrect rotor sizing imo.

r33 gtr front - 324 x 30mm
r33 gtr rear - 300 x 22mm

z32 front - 280 x 30mm (or 26mm obviously)
z32 rear - 297 x 18mm

mike i'm going to pm you the rest along with some pics in a bit. we're already sidetracking the thread as the op's question has already been answered numerous times!
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