why does it do this?

HITLIST · 09-18-2009, 02:17 PM

Quote:

Originally Posted by semtex

The the OP . . . you stated that you "tried to launch at around 4500 no higher and then went to shift into second . . ." Am I to understand that you held the clutch pedal in at 4500 then dumped it directly from neutral to 2nd gear? Or did you start off in 1st gear? I guess what I'm trying to figure out is what rpm you were at when you shifted into 2nd, and from which gear. Presumably, you would have shifted into 2nd from 1st, but the way you wrote it kinda makes it sound like you skipped 1st gear altogether and tried launching straight from 2nd.

i was launching around 4000 rpm in first gear an then hit say 7000 rpm and went into second and thats when it happend so yes i did start in first..

semtex · 09-18-2009, 02:23 PM

Quote:

Originally Posted by HITLIST

i was launching around 4000 rpm in first gear an then hit say 7000 rpm and went into second and thats when it happend so yes i did start in first..

Hmm...in that case, I see no reason it would have hit the rev-limiter in 2nd. Unless -- were you power-shifting? Like did you lift off the throttle in between 1st and 2nd? If you didn't lift in between, then maybe in that split second between gears it ran up to redline and triggered the rev-limiter. That's all I can think of. You already said you had TC off, so that shouldn't kicked in. (I'm just trying to be constructive.

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HITLIST · 09-18-2009, 02:34 PM

Quote:

Originally Posted by semtex

Hmm...in that case, I see no reason it would have hit the rev-limiter in 2nd. Unless -- were you power-shifting? Like did you lift off the throttle in between 1st and 2nd? If you didn't lift in between, then maybe in that split second between gears it ran up to redline and triggered the rev-limiter. That's all I can think of. You already said you had TC off, so that shouldn't kicked in. (I'm just trying to be constructive.

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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

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!