Will putting 110 octane in my stock Z do harm? Will it do any good as far as power increase?
Try it or waste of time?

 

Waste of time unless you have the ECU programmed to take advantage of it.

My understand is that a higher octane rating simply is more prone to resist detonation. By simply adding higher octane fuel, especially that high, you won't notice much of a difference.

 

I sure hope its unleaded. I've never seen unleaded with octane over 104

 

Would running leaded fuel damage the motor?

 

yes it would

it'd ruin your sensors

why do you guys need 110 octane?

if anything you'll LOSE power because there won't be enough compression in the piston chamber to get good spark ignition

if you go out to the track and are going to be running really hard, then run 100-103 octane

NEVER LEADED octane unless you have a race engine designed to run on leaded gas - probalby one that doesn't have fancy computer sensors....

 

Not the motor. It's kills O2 sensors after a while and kills catalytic converters quickly.

 

That's right. The computer can only advance the timing a certain amount. Once you're running an octane that causes no knocking at all, the computer will have advanced timing as far as it can. After that, continuing the increase the octane further will make no difference at all. 93 octane is probably the magic number on a 350Z where you'll get zero knocking. Beyond that and you're wasting money.