Are the stock 350Z rotors able to be turned? I know some manufactures make the rotors too thin to begin with so they can't be turned, ex VW.

 

Yes.

 

As long as the fronts are at least 22mm thick or 14 on the rear and they're not warped, they can be turned.

 

Are your rotors really "hurt" ? You rarelly need to turn rotors. It makes bedding-in pads a bit quicker but above all, it makes you buy rotors that more often ($$$ for your vendor)...

 

All quality rotors start out as nominal, usually 2 mm excess on front an 1-2mm excess on rear.

Wear rate of metal is a function of cast iron grade quality and abrasiveness of pads VS. STOPS AND DURATION PER MILE.

Obviously 100 miles on interstate is very very very different than the same distance in bumper to bumper traffic..............you might apply brakes once every 500 feet vs never on the highway...........that 1,000 times more braking in the city.

Why specifying rotor life in miles is so variable and meaningless.

 

I can't tell exactly how much ware they have until I take the wheels off. I am changing to HPS pads this weekend and if the rotors need it I am going to have them turned; otherwise I won't.

So depending on how much life they have left I could either do nothing to them, turn them, or get new ones. Would one want to put new pads on used rotors w/o turning them?

 

Why not ? If the rotors are still true in flatness, don't have any nasty deposits, aren't locally hardened or crazy thinkness variation, in short if the brake pedals isn't pulsating, you don't have to trun them.

If the pedal is pulsating, you'll want to identify the source of the pulsation. In most cases, it's from uneven pads deposit of the rotors. That can be fixed with a good bed-in session.

Small circular grooves on the rotors aren't bad either. Once the pads has comformed to them, they actually give more surface contact area.

Take your time setting the pads in on used rotors as it will take a bit longer than is the rotors have been turned. That's all.

 

The vernier of the disk lathe can be set in 0.0005" increments by a careful expert operator....................new bits vs worn out used bits [cutting tool].

Taking ones time in set up [95% don't] can remove just enough metal to allow many many retrues.........................You get what you pay for at slam bam thank you places.

Most places remove double what is required to avoid the chance that they will have to recut again to correct a missed place on the rotor. Warping and material excess is NOT LINEARLY distributed across rotor.