Originally Posted by clarkkent06

it's definitely not something that will void your warranty. I'm almost positive he doesn't know either A) what you're talking about specifically or B) he just doesn't know. I think he might think you are venting the PCV valve to the atmosphere, which "technically" is not emissions legal. But you're not, it's still going back into the engine. All you are doing is removing one hose and replacing it with 2 hoses with a can in the middle. It is COMPLETELY reversible. And easily reversible, if you're worried about the Infiniti tech's seeing it.

Yes, I know. Pinging is the layman's term for "pre-detonation". In other words, the gas and air in your cylinders is exploding before the spark plug is firing (bad). It mainly happens under high load situations, like going up hills in lower RPM's. Like you're experiencing. And yes, you can prevent it by manipulating the throttle (putting less gas into the chambers). One thing that causes pinging is a "lean" fuel mixture (lots of air and not much gas). This will burn "hotter", which heats up the cylinders, which will cause pre-detonation. Lots of low emissions vehicles these days are tuned from the factory to run leaner rather than richer (thereby causing more pinging). Why, you ask? Lean fuel mixtures A) get better gas mileage and B) burn hotter and therefore cleaner and more completely for less emissions. So, theoretically, you could get an piggyback computer and get it tuned and program your car to run richer (which could actually gain you horsepower). Obviously you'd lose gas mileage, and also possibly not pass emissions. I've noticed much much less pinging with the catch can, and I'm sure you will, too. Especially after cleaning the upper plenum.

By the way, if you're worried about a catch can voiding your warranty, you might not want to put the plenum spacer in there. Putting anything on, however minor, could potentially be causing warranty voiding issues, depending on your dealer and all that. A oil catch can most likely will not, a plenum could, they could claim crazy stuff about you opening your engine and all that.

Originally Posted by parhamm1

Here in the G community that rattle noise you're hearing is referred to as flywheel chatter. This is 100% normal on all G35 and 350z 6mt's. Changing the clutch and flywheel to something other than stock will do nothing more then increase the noise. If you don't like the noise hold in your clutch while shutting down or next to a wall in a drive thru line. I've learned to live with it and remain loving my 6mt coupe.

I'm more then happy to thoroughly explain it if you would like, but if you search 'flywheel chatter' here on Driver you will probably discover endless information.

Matt