One thing I only just got around to doing was the front caliper upgrade.
Looking at S30 upgrade info, the first port of call are Toyota Hilux calipers, 4 piston and vented.
I initially picked up a S12+8 caliper for a vented disc off a Landcruiser for a dollar to do some measurements.
Here it is side by side with the stock 260C caliper.
Measurements looked good so I picked up some S12W ones to use.
Stock caliper mount bolt centre to centre is 3.5", so is the Toyota caliper.
Stock caliper mount boss is 19mm thick and the bottom mount slots in between the steering knuckle and the spindle, Toyota caliper is 19mm too so no problems there.
Then I had to find a disc that would work with minimal messing around.
After trawling through the DBA disc catalogue the vented 5 stud Z31 86-89 Turbo (DBA604) one looked promising.
Disc OD 271mm 274mm
Disc ID 81mm 81mm
Thickness 12.5mm 22mm
Width 43.5mm 35.5mm
Only thing I wasn't sure of was the bolt pcd as the 260C one is around 103mm, so I ordered a set hoping that Nissan had kept it the same, thankfully they did.
The PCD was a match
I was trying to make the swap as simple as I could so replacing parts in future wouldn't requiring any work to fit them. All I needed was an 8mm spacer, no modifications to the discs were required but I did have to widen the disc slot in the calipers from 23.3mm to 26mm and shave down the ribs on the side in order to fit my wheels.
Then I put in a new 15/16 master cylinder and 10 psi residual pressure valve on the rear circuit and made up a couple new lines.
They feel a lot better so far and I haven't had any fade.