Hey hey,
Just a few things I thought I'd share, Mk4 16x8/9 wont fit over em. If you got the 350z track disc (I recommend) then get your center hub spacer made up like the pic below with the taper on the inside and outside, means the disc actually 'locks' the spacer onto the hub. Mine were such a tight fit that I had to heat them up to fit them, extra help staying on
OH and for the kit to work correctly (like intended) you NEED the z32 or R32 4 pot calipers. The R33 and R33 GTR calipers (while the same caliper) actually have different length legs on them. The latter two put the caliper too far off the disc. The Z/R32 caliper puts the whole pad on the disc. The others wont unless you find another disc thats bigger but has the same offset etc. ALSO there are two different calipers for the '32s, one has a space for IIRC a 30mm disc, while the other has room for a 32mm -or I think that was the width of the gap for the disc on the side of the calliper. You want the 32mm. Which again IIRC is the only one on the z32, and is the aluminum one on the R32 (not the Iron one). But check the link rather then going on my memory from a year ago! lol
Heres a bookmark I have that compares teh calipers:
http://www.princeton.edu/~asad/zbrakes/
For the sake of argument, in Australia (Vic) to see if you need to do have an engineering brake test you work out the area of the piston on the inner side (if double sided) then compare to the area of the pistons on the inner side of the replacements. So effectively on the Skyline calipers you work out the area of the 2 pots on the inside etc and compare to the single pot on the A70. When I did this the area's were actually comparable. Although I've found the braking heaps better then the stockies. ALSO the reason I went this rather then Az's was that it was ment to be cheaper (bad currency conversion at the time) altho I ended up spending about the same as I went all new except the calipers which were rebuilt AND the lack of dust sheilds on the wilwoods means you need to rebuild once a year (for a daily) to keep them reliable etc from what I was told, plus dust sheilds are a legal requirement in VIC, from what I was told by my brake specialist. Oh and willwoods don't have a good rep round here, if your serious about race style brakes you skip em and get some better quality calipers. Not a shot at anyone, just what my brake specialist tells me (he should know he races and services several rally cars
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I got the Blitz M3 pads, Good shit tho they take a bit to heat up
I hope that helps someone!
Pics:
The last pic the caliper isn't quite sitting on right, its hanging off a bit