engine harshness at high revs

Chan Chee Hoe · 06-29-2009, 09:50 AM

I have heard[don't know true or false],our cars comes with a active electronic controlled engine mounting,maybe it becomes harder when the revs rise above a certain Rpm,can anyone comfirm this.?

wstar · 06-29-2009, 10:30 AM

Quote:

Originally Posted by Chan Chee Hoe

I have heard[don't know true or false],our cars comes with a active electronic controlled engine mounting,maybe it becomes harder when the revs rise above a certain Rpm,can anyone comfirm this.?

I don't think this is true. I looked in the Service Manual at the exploded view, they show the engine mounts (there's 3, one on each side and one at the rear), and there's no indication of any kind of electrical (or other) connections to them, they're just standard rubber/urethane/whatever mounts.

t-ray · 06-29-2009, 11:19 AM

This motor is a tad more coarse IMO than the HR. The HR was *much* more so than my Revup, which itself isn't as smooth as the normal VQ35DE. And I've heard from owners that moved up from the VQ30 to the VQ35 that the VQ30 was much smoother as well.

It appears to be a negative trend spanning nearly over a decade now.

RCZ · 06-29-2009, 12:41 PM

so we have some weird liquid filled engine mounts right? I wonder if Nissan did this to cover up the harshness/vibration...

Phimosis · 06-29-2009, 01:34 PM

Quote:

Originally Posted by RCZ

so we have some weird liquid filled engine mounts right? I wonder if Nissan did this to cover up the harshness/vibration...

The new 911 GT3 uses weird liquid filled engine mounts (as an available option), but they are talking about them as a point of pride because it's a technological breakthrough, rather than trying to cover it up.

mrmixitup · 06-29-2009, 02:12 PM

Quote:

Originally Posted by RCZ

Our car is very rough at high RPM's...I've been in a few cars that should be rougher per se, but are smooth as silk compared to this. Nissan lost points in the refinement department with this engine...

SRT-4 owners complained about the harshness of the muffler-less exhaust and the harshness of the turbo kicking in when they first picked up their cars. But that's why people purchased the car.

earwicker7 · 06-29-2009, 06:00 PM

Hey, it sounds better than the Ford Focus I drove before it, so I'm not that bothered.

wstar · 06-29-2009, 06:09 PM

I wonder if there's some variance in our engines, or perhaps it quiets down after sufficient break-in? Mine's a little harsh, but after hearing you guys complain about it, it makes me wonder if we're hearing the same things or not. Mine's not really that bad. I'm at just a hair under 7K miles now, and I guess 7AT could make a difference too, as the torque converter / trans will damp engine vibration differently than your flywheel/clutch setup will.

earwicker7 · 06-29-2009, 07:09 PM

Quote:

Originally Posted by wstar

I wonder if there's some variance in our engines, or perhaps it quiets down after sufficient break-in? Mine's a little harsh, but after hearing you guys complain about it, it makes me wonder if we're hearing the same things or not. Mine's not really that bad. I'm at just a hair under 7K miles now, and I guess 7AT could make a difference too, as the torque converter / trans will damp engine vibration differently than your flywheel/clutch setup will.

Interesting, as I also have the 7AT (I would have loved to get a manual, but driving one in Los Angeles is brutal, so I sissy'd up and got the auto) and don't find it annoying at all.

RCZ · 06-29-2009, 07:24 PM

wstar, your car doesnt vibrate at high rpm?

wstar · 06-29-2009, 10:27 PM

Quote:

Originally Posted by RCZ

wstar, your car doesnt vibrate at high rpm?

Well, it certainly sounds quite loud and raw up around 6-7.5K, and I could see how some would call it unrefined, but I wouldn't say the car is vibrating in a really noticeable way, and doesn't seem as bad as some people seem to be making it here. Are you feeling that through the steering wheel, pedals, shifter, etc? Tomorrow if the rain is gone I'll go for a drive in the morning and specifically pay attention for it so I can compare.

m4a1mustang · 06-29-2009, 10:40 PM

I think maybe the M6 guys feel it more than the 7ATs. I get a lot of that coarse feedback not only from the seat but from the gearbox and the clutch as well.

I am willing to deal with it but it does irk me every now and then considering the test drives I did with the Cayman S... so every now and then I think about how silky smooth that engine feels compared to the Z. But thinking about the price differential usually kills any "should have bought the Cayman" thoughts.

Though it is funny, I think, that my '03 Mustang GT's 4.6L V8 was a lot smoother and a little more refined feeling than this V6. I'm not really a fan of the gearbox in the Z either so it kind of annoys me every now and then.

Maybe I'm just picky, though. I've pretty much accepted the fact that no matter what car I have I will never be totally happy with it.

RCZ · 06-29-2009, 11:23 PM

maybe 6mt is a lot worse. I can feel it in the floor, shifter, steering wheel. I've noticed the transmission mounts need some serious work too. The mounts are too soft.

wstar · 06-30-2009, 10:48 AM

Quote:

Originally Posted by RCZ

maybe 6mt is a lot worse. I can feel it in the floor, shifter, steering wheel. I've noticed the transmission mounts need some serious work too. The mounts are too soft.

Hmmm, I tried to pay better attention this morning, but no I don't think I'm getting vibration like you describe. It could be that your vibration is largely coming into the body though the clutch/transmission, and my torque converter is eating it up instead on the 7AT.

zZSportZz · 06-30-2009, 11:02 AM

Quote:

Originally Posted by RCZ

maybe 6mt is a lot worse. I can feel it in the floor, shifter, steering wheel. I've noticed the transmission mounts need some serious work too. The mounts are too soft.

I have a 6MT and the whole car vibrates and almost feels like its going to rip apart at any moment lol (slight exageration) at high rpms. You really do feel it in the floor, steerng wheel, shifter...even the seat to some extent.

06-29-2009, 06:09 PM	#23 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	I wonder if there's some variance in our engines, or perhaps it quiets down after sufficient break-in? Mine's a little harsh, but after hearing you guys complain about it, it makes me wonder if we're hearing the same things or not. Mine's not really that bad. I'm at just a hair under 7K miles now, and I guess 7AT could make a difference too, as the torque converter / trans will damp engine vibration differently than your flywheel/clutch setup will. __________________ 7AT Track Car! Journal thread / Car setup details

06-29-2009, 10:40 PM	#27 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6962	I think maybe the M6 guys feel it more than the 7ATs. I get a lot of that coarse feedback not only from the seat but from the gearbox and the clutch as well. I am willing to deal with it but it does irk me every now and then considering the test drives I did with the Cayman S... so every now and then I think about how silky smooth that engine feels compared to the Z. But thinking about the price differential usually kills any "should have bought the Cayman" thoughts. Though it is funny, I think, that my '03 Mustang GT's 4.6L V8 was a lot smoother and a little more refined feeling than this V6. I'm not really a fan of the gearbox in the Z either so it kind of annoys me every now and then. Maybe I'm just picky, though. I've pretty much accepted the fact that no matter what car I have I will never be totally happy with it. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Whine/Noise/High Pitch Arg!	prodigyz	Engine & Drivetrain	153	05-02-2014 01:41 AM
High pitch whine	antennahead	Nissan 370Z General Discussions	31	11-24-2010 05:56 PM
High oil temp fix for Nismo 370Z	FairmanZ	Nissan 370Z General Discussions	6	07-16-2009 09:33 PM
Nissan 370Z Touring: Brakes and Blips and Revs, Oh My!	AK370Z	Nissan 370Z General Discussions	35	05-26-2009 05:42 PM
High-Powered Vehicle	Indy	Australia/New Zealand	1	04-15-2009 10:51 PM

06-29-2009, 09:50 AM	#16 (permalink)
Chan Chee Hoe Track Member Join Date: Mar 2009 Location: Singapore Posts: 861 Drives: 370z,Yellow,7sp A Rep Power: 17	I have heard[don't know true or false],our cars comes with a active electronic controlled engine mounting,maybe it becomes harder when the revs rise above a certain Rpm,can anyone comfirm this.?

06-29-2009, 11:19 AM	#18 (permalink)
t-ray Base Member Join Date: Apr 2009 Location: bham al Posts: 91 Drives: 05 g sedan 6mt Rep Power: 16	This motor is a tad more coarse IMO than the HR. The HR was much more so than my Revup, which itself isn't as smooth as the normal VQ35DE. And I've heard from owners that moved up from the VQ30 to the VQ35 that the VQ30 was much smoother as well. It appears to be a negative trend spanning nearly over a decade now.

06-29-2009, 12:41 PM	#19 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	so we have some weird liquid filled engine mounts right? I wonder if Nissan did this to cover up the harshness/vibration...

06-29-2009, 06:00 PM	#22 (permalink)
earwicker7 Enthusiast Member Join Date: Jun 2009 Location: Burbank, CA Posts: 265 Drives: 09 370Z (maxed out) Rep Power: 16	Hey, it sounds better than the Ford Focus I drove before it, so I'm not that bothered.

06-29-2009, 07:24 PM	#25 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	wstar, your car doesnt vibrate at high rpm?

06-29-2009, 11:23 PM	#28 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	maybe 6mt is a lot worse. I can feel it in the floor, shifter, steering wheel. I've noticed the transmission mounts need some serious work too. The mounts are too soft.