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240z brake upgrade s12+8calipers magna rotors


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#1 zcar63

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Posted 01 November 2010 - 01:45 PM

Hi Guys, i have been reading this forum  for a long time and thought i should make a contribution.I happened across  some Toyota s12+8  vented calipers (these calipers are made for a vented rotor , the rotor gap is 23mm i assume for a 20/22mm toyota rotor . there are  2 types of S12+8 calipers  1 for NON-VENTED and 1 for VENTED rotors, check the gap in caliper for width to know which one you are getting) cheap $25 a pair  to fit onto my 1971 240z.Having read the sticky on upgrades i thought i might as well have a crack at it, using the Mitsubishi Magna  front vented rotor from  the  TN,TM,TP model part # DBA 221 .A couple of issues came up that i haven't read in the other posts. The s12+8 vented caliper wasn't wide enough for the Magna rotor, the caliper(s12+8) can only accept a 22mm wide rotor as the gap in the caliper is 23mm at its widest, and the Magna rotor is 24mm wide.So i made some 3 mm spacers (with recess for an "o"ring) to widen the caliper. Please see picture.The rotor centre hole was opened up from 69mm to 81mm to fit onto the hub and 4 new holes were drill at 103mm pcd  to bolt the rotor to the hub.My 240z hubs are a little different from 260z hubs ,so i only needed to use 1.5mm spacers between the caliper mounting holes and the strut leg to move the caliper back (further inboard) to centre the caliper over the rotor.Next issue is my road rims are 14x6 eneki mag and won't bolt up the the hub as the new s12+8 calpiers are sticking out to far and catching on the back of the wheel spokes(run an 8-10mm spacer and buy some longer wheel studs part # NS 4570!).My 15x7 Performance Superlites with race tyres are just fouling a bit  on the wheel hub(run 3mm spacer) and another set of 15x6.5 rims are fine. Plus install new brake master cylinder Nissan Patrol 1 inch part #JB1419

COST BREAKDOWN 25/10/2010
Calipers                                $25.00 pair    Magna rotors                  $45.00 each        long wheel studs $80.00 for 8
New caliper pistons Large    $22.00 each  Machine centre hole        $25.00 for both
New caliper pistons small    $17.50 each  Calipers spacers              $Free
Caliper seal kit PBR              $30.00 each  Brake pads Girling brand  $60.00
Master cylinder                    $110.00          Wheel spacers                  $25.00             

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#2 Riceburner

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Posted 02 December 2010 - 04:30 PM

Hey guys can anyone confirm if this will work? I have S12+8 non vented setup already and want vented rotors to stop fading on track days. So if I read this correct all I do is get 3mm spacers for the centre of the caliper and tp magna vented rotors  :o   

#3 Riceburner

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Posted 03 December 2010 - 08:06 AM

Guys are the S12+8 calipers only for non vented rotors??? Providing this mod hasn't been carried out.

#4 Riceburner

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Posted 12 December 2010 - 09:13 PM

What size holes are required for mounting the disc to the hub. Main hub needs to be machined to 81mm and the 4 bolt holes are 103mm pcd but what dia?

#5 d3c0y

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Posted 15 December 2010 - 09:45 PM

S12+8 came in two configurations one for solid and one for vented. But even the vented one is made for something like 20mm wide discs so you will need to run the spacer for the magna rotors regardless. I have a pair of brand new magna rotors i want to get rid of if you need some.

#6 kolonelklink

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Posted 18 December 2010 - 02:34 PM

the 23mm disc notch in the 12+8 caliper can be machined out to accept a 25mm rotor... am currently running these calipers with magna slotted rotors.

#7 Riceburner

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Posted 18 December 2010 - 04:34 PM

S12+8 came in two configurations one for solid and one for vented. But even the vented one is made for something like 20mm wide discs so you will need to run the spacer for the magna rotors regardless. I have a pair of brand new magna rotors i want to get rid of if you need some.


Thanks, but I already picked up a new pair for $45

#8 Riceburner

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Posted 26 December 2010 - 10:28 PM

I have rebuilt S12+8 calipers for a vented rotors, new vented magna rotors DBA221's. The calipers have been machined wider to accomodate the 24mm thick rotor and I have bolted the disc rotors to 240 hubs on the car only to find that the calipers wont even go anywhere near fitting. What am i doing wrong?  :o Will 260z hubs give me the extra 10mm bigger offset I need?

#9 NZeder

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Posted 27 December 2010 - 06:46 AM

Yes.

240z rotor = 52mm offset on the rotor
260z rotor = 43mm offset on the rotor

So that is 9mm different aka the 260z hub is 9mm thicker vs the 240z items (as the total setup rotor and hub place the rotor in the centre of the caliper on a 240z as a 260z)

#10 Riceburner

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Posted 27 December 2010 - 07:44 AM

Yes.

240z rotor = 52mm offset on the rotor
260z rotor = 43mm offset on the rotor

So that is 9mm different aka the 260z hub is 9mm thicker vs the 240z items (as the total setup rotor and hub place the rotor in the centre of the caliper on a 240z as a 260z)


Great, got some on the parts car. Thanks NZeder!

#11 d3c0y

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Posted 10 January 2011 - 12:32 AM

Do any of you guys find that the magna rotor doesnt go all the way to the edge of the pads?

This is what i've read:

TP Magna 266mm diameter
240Z 271mm
hilux 289mm

so that's up to 23mm difference?

Are you getting pad over hang on the magna rotors?

#12 Riceburner

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Posted 10 January 2011 - 08:15 AM

I got my tp magna rotors off eBay for $45, I never measured the diameter but when I sat them on top off the old rotors they were the same size...

#13 d3c0y

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Posted 10 January 2011 - 09:23 AM

It is only 5mm difference so to a casual glance it probably would look the same. I'm just wondering what the sort of radius the hilux caliper mounts at compared to teh stock one - if it sits out further from the hub?
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#14 Riceburner

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Posted 10 January 2011 - 10:39 AM

With the RX-7 pads in a 12+8 caliper the pad material is in a different place so the do sit in 5-8mm from the edge. All I did was redrill the pin holes at the back of the pads to set them in the right place. If anything the hilux 12+8 calipers sit a little closer to the standard hub.

#15 d3c0y

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Posted 11 January 2011 - 01:40 PM

what sort of clearance do you have from the top of the rotor to the inside of the caliper.

#16 Riceburner

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Posted 11 January 2011 - 04:03 PM

From the outside edge of the rotor it's around 6-7mm to the back face of the rotor groove in the caliper.... If that makes sense :o hehe

#17 d3c0y

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Posted 11 January 2011 - 04:27 PM

yeah thats what i was thinking of!

Hrrm so it sounds like the max rotor size is the same dimensions as the stock 240Z rotor. I wonder what different 5mm of rotor diameter make?




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