Z31 rear conversion

[s13eater]

Originally Posted by Draconis

Yes, in theory you could but with the extra spacing for the rotor, it wouldnt work. Reason being, when trying to put on a wheel after putting the rotor on, there are virtually not threads on the lug studs and the caliper would not work due to different spacing of the bridge and the caliper itself needing to fit the extra width of the rotor. I'll get some better pics tomorrow.

ok matey, cheers.

[CamInHead]

presume I need the Z31 specific caliper carriers, as well as the calipers themselves ?

[Draconis]

I do not know to be honest but would not be surprised if the carriers are different. Just the calipers themselves are different.

[CamInHead]

I'm also wondering how the z31 rear ARB/Sway bar compaires to S12....?

edit:

Originally Posted by Draconis

I do not know to be honest but would not be surprised if the carriers are different. Just the calipers themselves are different.

TBH I'm hoping they're the same as IIRC the discs diameter is the same and I'll probably plump for refurbed calipers (rather than do it myself).

[CamInHead]

Hey peeps I'm still unting these damn brackets!

A mate suggested getting the s12 brackets machined to accept the wider Z31 vented discs. Can anyone se why this wouldn't work ?

[CamInHead]

quick blag; got the brake hardware and I got a z31 beam off ebay. save for a couple of bent brackets it looks in good shape and even came with handbrake cables attached (no doubt they're borked).

I'll start a proper project thread but I'm skint after buying that porker.

[gerryb]

I'm a bit confused with this thread. This is what I have 'seen' with Z31's.

MkI 84 to late 86 - non ventilated disc on rear 290mm dia. same calipers as s12 with the exception of mounting 'ears' which are longer to accomodate 290mm dia. rotor. (NB non turbo = 4 stud till 85, all others 5 stud)


MkII early 87 to 88 ventilated rear rotors,(both turbo and non turbo are all 5 stud) can't remember exact diameter, 282mm from memory. Calipers match rotors with wider opening to suit, (not interchangeable with earlier calipers). The trailing arms have a 10mm longer "bearing tube", to push the hubs out 10mm to suit the extra 10mm of rotor width. (I have a set of these later trailing arms complete and have compared it physically and measured the differences with earlier type Z31 setup)

So in closing if you want the ventilated setup you need the whole trailing arm with rotors and calipers and swap it onto your s12.