why does it do this?

semtex · 09-18-2009, 02:54 PM

Quote:

Originally Posted by HITLIST

Thank you and one more thing has anyone heard your clutch box i think thats what it is but when you take it out of first and are parked or stopped can you hear your clutch spinning kind of loud just a ? those lil noises bother me

One other thing to be aware of with this car (if you aren't already) is that it has a very heavy flywheel. More mass = more inertia. You may have noticed that in between upshifts, the revs are a little slow to drop -- that's due to the inertia of the flywheel. The way it could factor into what happened is that if you were going WOT, when you disengaged the clutch with all that power going to the flywheel a moment before, the flywheel could have actually gone up in revs momentarily, even if you lifted off the throttle. And if you were really close to redline, it may have been just enough to hit redline and trip the limiter.

Speaking of the flywheel, it's the flywheel you're hearing, not the clutch, and yes I hear it too. It's normal for this car. In fact, flywheel noise is why Nissan put such a heavy flywheel in. They did the same thing in the 350Z. I don't fully understand the technical aspects of it, but a higher mass flywheel = less noise. I had a 350 before the 370 and put in a JWT lightweight flywheel. Man, my car sounded awful after doing that! The performance gain was there, sure. But sitting there at idle with the clutch disengaged? It sounded like something was wrong with my engine!