Zuffy, they are not coilovers, just dampeners/shocks, I think that Koni is realising some coilovers soon for 350z, but they are going to be very expensive. So it means if you want to lower your car, you'll have to get aftermarket springs.
The front can be done in seconds, pop the hood and adjust with pliers.
The rear takes about 10min, if you have hydraulic jack pop it under the diff, get the rear of the car high enough so the tires are not touching the ground. You'll get a gap big enough to put your hand in between the tires and the fender. Now you can adjust the konis at the top of the straut. In the photo below I've highlighted in blue the adjustment point. I've already showed you on the cruise what I use to adjust it. By the way, when you put the rear shocks in, you have to make sure that the adjustment point is facing towards the wheel, otherwise you'll not be able to adjust it without removing the shock.
ky350, you have one next to your spare wheel. Also, how many times are you going to adjust the setting? I've adjusted mine months ago and I've not touched them since. You have to know that there is no easy adjustment for 350z for any coilover, unless you go with Tein and there electronic adjustment, which only adjust dampening and nothing else. Also other coilovers need to be removed to be adjusted so it's not that bad.
I think Yun and Murray should join in and tell us how their HKS and Cusco coilovers are adjusted.
The 350z is different to most other cars in that there is no access to the top of the rear struts. Most of the shocks and coilovers out there require the adjustments made to the top of the shock. I have seen one company put it towards the bottom but even that would be difficult to gain access to without jacking the car up because of the wheel, brake and rest of the car in the way. If you are worried about how easy it is to adjust then get the Tein Flex with EDFC, you can adjust it from the drivers seat, or wait for the wireless EDFC to come out then you can adjust it from the bar stool.
The Cusco coilovers are adjusted at the top as well, for the front I pop the hood and use a small screwdriver or something similar and turn it to the desired setting (No photos, Zedd is at Nissan getting the gearbox replaced). For the rears I just get someone with a lift(Peter) to change it (When i get a trolley jack this may change but I probabally wont be using it for this as i havnt needed to change it yet.). Most setups out there will have the same issues so I dont think of it as a problem.
I bought a set of Cusco coilovers though technically the rears arent coilovers. Coilovers are a spring and shock designed to work together combined into one unit. This makes choosing the right spring rates and shock profiles easier as the manufacurer has already combined them correctly.
See how it is one unit, which also enables them to offer height adjustability.
My 5th gear is stuffed and a Nissan dude took the car for a spin and agreed its stuffed. Which the dealership could have told him so they are replacing it with a new one. Symptoms, It woulld grind into 5th unless I shift slowly.
Nuff - I ment I haven't got a hydrolic jack to lift the car in seconds. The spare jack is a PITA and only used in emergencies.
Personally, I would only change my shocks / springs if I had the ability to simply alter the setting for street / track use. I know that the Teins with EDFC give you that ability, but you pay a bomb for the installation of the EDFC in to the cabin - just no value for money IMO.
BTW, my new tyres have soften the ride of my Z amazingly, which is great for my daily driving. So i'm keeping the stock shocks until they go poof.
You mention changing them for track use etc, surely if any track use is your aim then the benefits of having better shocks or springs would outwieght the downside of having to jack the car up to adjust them?
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