why does it do this?

chris410

Even with VDC off it's not completely "off" you probably either hit rev-limiter and it blipped back down as you tried to shift or you set off a VDC parameter which kicked in. That's my best guess...launching at 4500 is ok if you know how to properly slip the clutch. Get it wrong and you'll bog and or glaze the flywheel/clutch plates which will require a new clutch!

__________________
Chris
Current: 2014 WRX Stage I + SPT / 2013 Hayabusa 202HP
Former:09 370Z 7-AT PW/Ark Type 2 exhaust/Evo R lip/TSW Nurburgring carbon

dszombiex

That was a very aggressive launch. Try not to do it again! I don't think that was a safety feature that went off. Sounds like something not so good might have happened. Someone please correct me if I'm wrong, I don't wanna give the guy misinformation.

kannibul

There's this thing called a rev-limiter. You found it.

frost

Agreed with the traction control comments. It would have felt pretty messed up if you had left that on, like the car was messed up.

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.

__________________
"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

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..

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. )

__________________
"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

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

semtex

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!

__________________
"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

zZSportZz

I love it when people go all high and mighty on someone else when they beat their car. Who cares? Its their car...and their money. They didn't grab your keys and beat your car...or your dog

Beat away my friend...beat away.

Just take pics/video next time.

__________________
--Rick

Forrest

+1. Its his dam car, its not like he is doing it to yours.

Hell the guy might be worth millions and its a throw away car. If he wants to lite his car on fire and sit in the middle of it, its aaaa oooo kayyyy by me. Long as he payed for it and has no more payments haha. I woudlnt want to see nissan get cheated out of what they were owed.

__________________
my pictures http://www.the370z.com/members/forrest-albums-370z.html

semtex

His insurance would pay off Nissan. And for some strange reason, the idea of insurance companies getting screwed doesn't bother me so much.

__________________
"There are no small accidents on this circuit." -- Ayrton Senna
316.8whp & 248 ft/lbs (Dyno Dynamics) | 319whp & 256 ft/lbs (DynoJet) (04/23/10)
Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

polarity

I'm with you there, for some reason that thought actually makes me really really REALLY happy.

As for the strange sensation I have no new guesses other than what the other guys have said. Have you considered trying a few launches at different (lower) rpms to see if you can recreate it without as much power (and without as much chance to hurt something)? Edit: Or maybe trying a 2500 rpm launch with the VDC still on to see if it is the same sensation as before.

To blown I say It's his car, he can drive it anyway he chooses. If he blows it up, maybe we will be lucky enough to hear how and it will give us even more information about the cars we all love. From what I've seen in this thread you're the one being immature. The man posted a question, he didn't ask to be treated like a jackass.

-William

HITLIST

thanks man yea from a digg at 3000 its solid it was just me i guess thanks again...

HITLIST

and yes BLOWN lol my car is paid for was the day i bought it the second i signed for it hooooooooora