Yeah, I definitely think the we 6MT guys feel it the most. You really feel the vibrations in the clutch pedal when you shift at high RPMs. We get feedback
|
|
LinkBack | Thread Tools | Display Modes |
06-30-2009, 11:16 AM | #31 (permalink) |
A True Z Fanatic
Join Date: Feb 2009
Location: Northern VA
Posts: 55,385
Drives: on two wheels
Rep Power: 6962 |
Yeah, I definitely think the we 6MT guys feel it the most. You really feel the vibrations in the clutch pedal when you shift at high RPMs. We get feedback from the clutch pedal and the shifter that the 7AT guys aren't getting.
Usually for them it's two hands on the steering wheel and the feedback you get from the wheel seems mostly to be from the road. I know at times pushing the clutch pedal in just feels downright nasty.
__________________
- Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook! |
06-30-2009, 12:48 PM | #32 (permalink) |
Base Member
Join Date: Jan 2009
Location: Houston, TX.
Posts: 182
Drives: Touring-Sport-Manual
Rep Power: 220 |
Likely this has to more to do with the natural imbalance of the V6, which has been exacerbated as they stroked the original VQ engine design more and more. Another engine recently revised with a longer stroke and VVEL is the VK50DE. How harsh is the VK50 in the FX50 at high rpms?
Edit: After finding Edmunds review, they stated that the VK50, 'much like VQ35/37 this V8 isn't quiet or smooth @ high RPM.' So we can rule that it's either the longer stroke, the VVEL or both. Last edited by Scribe; 06-30-2009 at 12:58 PM. |
06-30-2009, 03:11 PM | #33 (permalink) |
Base Member
Join Date: Feb 2009
Location: Germany
Posts: 31
Drives: 370z soon to come
Rep Power: 16 |
So, the problem must be related to the engine since it is noticeable in both the 6MT and 7AM (I know more in the 6MT but that doesnt matter).
Was this problem noticed in the 350z? Someone mentioned the VQ35DE was smooth. I am not familiar with engine names, but is that the 350z engine? To me, the problem seems like its related to the VVEL. Do the vibrations increase gradually as you rev higher or is it an instant thing? Has anyone driven a Honda with VTEC? VTEC kicks in full force at a certain rpm. Its like a whole nother engine. The intake seems 17 times louder than before VTEC kicks in and the whole car becomes harsher. Does it seem something like that? If so and the vibrations really kick in all at once at a certain rpm, then we can confirm that it is something related to the VVEL. If not, maybe it is an imbalance in the crankshaft or camshaft, something rotating.
__________________
'98 Ford zx2 '04 SRT-4 '07 Scion tc |
06-30-2009, 03:34 PM | #36 (permalink) |
A True Z Fanatic
|
Yes sir, but thats not the reason why I want harder mounts. I just feel the transmission mounts flexing and the shifts could be a lot more "positive" with some bushings. The car will feel a little crisper response if you remove the flex in the tranny.
|
06-30-2009, 03:37 PM | #37 (permalink) |
Base Member
Join Date: Feb 2009
Location: Germany
Posts: 31
Drives: 370z soon to come
Rep Power: 16 |
Yeah thats true. And usually with stiffer mounts you feel it more at idle. Since it seems like this problem isnt noticed at idle, the harshness must be more than just the mounts.
__________________
'98 Ford zx2 '04 SRT-4 '07 Scion tc |
06-30-2009, 04:09 PM | #38 (permalink) | |
A True Z Fanatic
Join Date: Feb 2009
Location: Northern VA
Posts: 55,385
Drives: on two wheels
Rep Power: 6962 |
Quote:
VVEL may or may not have something to do with it, but I'd venture to guess that it probably isn't the root cause. It's probably just how the engine naturally behaves and we just have to deal with it. It's definitely wierd, though, because it doesn't feel right when you drive the car hard... but it probably is right. Just have to get used to it I guess.
__________________
- Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook! |
|
07-04-2009, 09:44 AM | #39 (permalink) |
Base Member
Join Date: May 2009
Location: Bristol, VA
Posts: 59
Drives: 09 370Z Bl 6MT
Rep Power: 16 |
The electronically controlled motor mounts are usually 'soft' at <950rpm and
'hard' at >950rpm. The VQ35DE in the Altima/Maxima/Murano has a vacuum/solenoid controlled system that softens the mounts at idle and hardens them at speed. The 370Z doesn't have this system. There's vacuum tubes that lead to the motor mounts that would be there and they aren't on the Z. Dunno bout fluid-filled mounts, though. Nissan used fluid-filled mounts on the transmission and front (side) motor mount on the Altima VQ. Judging by the harshness of the Z, I'd doubt there are any fluid-filled mounts on this car. Late, Trav |
07-06-2009, 11:04 AM | #40 (permalink) |
Base Member
Join Date: Jun 2009
Location: Southeast
Posts: 11
Drives: M3, considering 370z
Rep Power: 16 |
It's largely an inherent property of the engine. A V6 is not inherently balanced. Neither is an inline 4 cyl, a boxer 4 cyl is.
Straight 6 cyl and 90 degree v8s are inherently balanced also. That's partly why BMW uses straight sixes and refers to a V6 as a bent six. When u take a motor that's not inherently balanced and give it large pistons and a long stroke (high velocity), it's going to vibrate a lot. You must then add counter weights to smooth things out, but that robs power and increases complexity. They can be made smooth ie NSX, but it's not easy. I have an M3 and a 335, and they're smoth as silk. Coming from that, the VQ37 feels VERY harsh. You can't compare the vq37 to the v8 because the v8 is an inherently balanced configuration. I could explain in much more detail, but I'm typing on my iPhone |
07-06-2009, 12:03 PM | #42 (permalink) | |
Base Member
Join Date: Jan 2009
Location: Houston, TX.
Posts: 182
Drives: Touring-Sport-Manual
Rep Power: 220 |
Quote:
|
|
07-06-2009, 12:19 PM | #43 (permalink) | |
A True Z Fanatic
|
Quote:
__________________
'09 370Z - '93 300ZX Vert - '83 280ZX - '83 280ZXT -'81 280ZXT stroker - '72 240Z - Stillen CBE, HFC, G3, Grounding Kit, Sways // Swift Spring // H&R 15mm // 5% Tint // Clear Bra // |
|
07-06-2009, 02:30 PM | #44 (permalink) | |
A True Z Fanatic
Join Date: Mar 2009
Location: Greenville NC
Posts: 2,883
Drives: 370Z Sport
Rep Power: 976 |
Quote:
There is an inherent Harshness factor with this motor, but it does seem to vary a bit between cars... |
|
07-06-2009, 02:42 PM | #45 (permalink) |
A True Z Fanatic
Join Date: Jan 2009
Location: Kansas
Posts: 3,800
Drives: 09 Z34-TT 6MT
Rep Power: 43 |
I've not revved my car much to notice harshness (1800 mi. so far), but I notice a hint of it compared to my VQ35DE. Engine sound of the VHR seem to be more relaxed at 4k, which is like 3k in the DE (it gets angry quicker). From watching the Genesis 3.8 videos, the VQ definitely lost some smoothness.
What I really like about the VQ37 is the lower engine note that compliments the higher note of the exhaust sound. With the VQ35, that lower engine note is not present. Overall... love it!
__________________
|
Bookmarks |
|
|
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 |