DIY Spring Installation
bought the lowered spring RS-R Ti2000 just few days before the trackday... 
spec:
Design: Linear
F Drop: 15mm (.6in)
R Drop: 15mm (.6in)
F Stiffness: 6.2kg/mm (345lb) (+10%)
R Stiffness: 7.5kg/mm (417lb) (+22%)
Stiffness transfer: 12% to Rear
Notes: Ti2000 is titanium spring. its really light compared to the OEM spring or the RS-R basic...
i like this spring coz it doesnt drop the car too low... im scraping everywhere already with stock spring...
- jack up the car, sit it on four jack stand...
- remove the wheels
- start from the easiest one... rear spring... 350z has multi link setup at rear so i dont need to remove the suspension...
remove the bolt holding the arm (jack up the suspension arm abit to release the tension so that you wont strip the bolt), and press the arm down using a metal bar or something like that (towards the red arrow direction... ) - you should have enough space to remover the spring from the 'pocket'... take of the rubber top cone and fit in on the new spring. fit in in reverse order and torque the bolt back to the manufacturer specs
- now the front suspension removal
use to ratchet to unbolt the main arm bolt (the bolt that connect the suspension and the main control arm). jack up the bottom of the arm abit to release the tension (preventing you stripping the bolt)
- detached the brake line from the suspension
- detached the speed sensor from the suspension
- remove the swaybar link bolts from the suspension arm (its the one next to the suspension bolt)
use rubber mallet to knock the bolt out, should be easy... if its stuck, dont push it... try jacking up the suspension arm to release the tension... - now... if you dont want to use spring compressor to remove the suspension, you can do what i did... i remove the 'A' arm link...
first remove the safety clip... (its bent, so straighten it and pull it out...)
then just unbolt it normally...
- remove the sturt mount top bolts... 3 of them... careful not to strip them *look at shaun (-_-)*
- now you can press the whole lower suspension arms down by holding to the 'A' arm connector... pres it down firmly and the strut should have enough space to come out... careful not get tangled with the brake line...
- now that the suspension off, if you have spring compressor, compress the spring and the remove the top bolts on... remember to mark the top and bottom position so it can be installed back easily...
i didnt have spring compressor, so i bring it to PROTEK tyres for them to swap the spring for me... they made it look so easy... - anyway, install in reverse order... i cbf writing anymore
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