engine harshness at high revs

zZSportZz · 06-28-2009, 11:04 PM

I agree, it feels like the engine is going to slap me in the face past 6500 rpm. I think the reviewers were well in line when they complained about the harshness, picky or not. Lets me honest here. Love the car BIGTIME, but it is harsh.

Chan Chee Hoe · 06-29-2009, 08:50 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, 09:30 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.

jyhighsky · 07-15-2009, 07:03 AM

Quote:

Originally Posted by zZSportZz

I agree, it feels like the engine is going to slap me in the face past 6500 rpm. I think the reviewers were well in line when they complained about the harshness, picky or not. Lets me honest here. Love the car BIGTIME, but it is harsh.

lolll

t-ray · 06-29-2009, 10:19 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, 11:41 AM

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, 12:34 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.

earwicker7 · 06-29-2009, 05:00 PM

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

wstar · 06-29-2009, 05:09 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, 06:09 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, 06:24 PM

wstar, your car doesnt vibrate at high rpm?

wstar · 06-29-2009, 09:27 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.

FricFrac · 07-06-2009, 11:19 AM

Quote:

Originally Posted by wstar

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.

I'm confused about the vibration issue. To me the car seems very smooth even at 7K - is it possible that there is a difference between cars? Or have I just been driving older vehicles for too long? Is it possible I just don't have enough miles (around 2000 miles) on the vehicle? I'm not detecting any significant vibration yet I can feel every nook and cranny on the road...

Modshack · 07-06-2009, 01:30 PM

Quote:

Originally Posted by FricFrac

I'm confused about the vibration issue. To me the car seems very smooth even at 7K - is it possible that there is a difference between cars? Or have I just been driving older vehicles for too long? Is it possible I just don't have enough miles (around 2000 miles) on the vehicle? I'm not detecting any significant vibration yet I can feel every nook and cranny on the road...

Mine's been smoothing out more as it gets miles on it...Plus my intake/exhaust is fully adapted now. 2100 miles and it keeps getting better. I found it very annoying when the car was newer..

There is an inherent Harshness factor with this motor, but it does seem to vary a bit between cars...

VTalumni · 07-07-2009, 09:42 PM

Quote:

Originally Posted by Modshack

Mine's been smoothing out more as it gets miles on it...Plus my intake/exhaust is fully adapted now. 2100 miles and it keeps getting better. I found it very annoying when the car was newer..

There is an inherent Harshness factor with this motor, but it does seem to vary a bit between cars...

Is it getting better or could it be that you getting used to it?

06-29-2009, 05:09 PM	#9 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3595	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

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06-28-2009, 11:04 PM	#1 (permalink)
zZSportZz A True Z Fanatic Join Date: Mar 2009 Location: Maryland Posts: 1,095 Drives: 370z Blk on Blk 6MT Rep Power: 19	I agree, it feels like the engine is going to slap me in the face past 6500 rpm. I think the reviewers were well in line when they complained about the harshness, picky or not. Lets me honest here. Love the car BIGTIME, but it is harsh.

06-29-2009, 08:50 AM	#2 (permalink)
Chan Chee Hoe Track Member Join Date: Mar 2009 Location: Singapore Posts: 861 Drives: 370z,Yellow,7sp A Rep Power: 18	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, 10:19 AM	#5 (permalink)
t-ray Base Member Join Date: Apr 2009 Location: bham al Posts: 91 Drives: 05 g sedan 6mt Rep Power: 17	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, 11:41 AM	#6 (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, 05:00 PM	#8 (permalink)
earwicker7 Enthusiast Member Join Date: Jun 2009 Location: Burbank, CA Posts: 265 Drives: 09 370Z (maxed out) Rep Power: 17	Hey, it sounds better than the Ford Focus I drove before it, so I'm not that bothered.

06-29-2009, 06:24 PM	#11 (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?