engine harshness at high revs

RCZ · 07-10-2009, 03:31 PM

Quote:

Originally Posted by need4speed

If I didn't want harsh n course and boominess n road n engine noise?
But be trying to buy an acura or lexus sedan.
Why the F&%K would I want a quiet race car!
And a slightly notchy stick is more fun 2.
F&#k the reviewers. Take the minor criticisms like those with less than a grain of salt.
The Z is perfect fun.

Wow.

We aren't talking so much about sound here, its more the vibration at high RPM that bothers some of us I think. Just because its a sports car, it doesnt mean it should feel so coarse and out of control at high RPM. We go back to the same point over and over... and the fact of the matter is that an engine that is made to rev high and for sport driving should be MORE well balanced and exhibit LESS vibration. The engine internals are put through so much more stress, being a sports car and all, that it should be a LOT smoother to aid in its longevity.

Does that make sense to anyone else or is it just me being crazy?

Modshack · 07-10-2009, 03:41 PM

Quote:

Originally Posted by RCZ

Wow.

We aren't talking so much about sound here, its more the vibration at high RPM that bothers some of us I think. Just because its a sports car, it doesnt mean it should feel so coarse and out of control at high RPM. We go back to the same point over and over... and the fact of the matter is that an engine that is made to rev high and for sport driving should be MORE well balanced and exhibit LESS vibration. The engine internals are put through so much more stress, being a sports car and all, that it should be a LOT smoother to aid in its longevity.

Does that make sense to anyone else or is it just me being crazy?

You're on the money....Coarsness bothers me. When an engine revs smoothly to redline it feels like everything is working in Harmony. Too bad it's not as good as the Hyundai Coupe in this regard. Certainly not as nice as my last Boxster. I tend to short shift at 6K as a result...

iwantone09 · 07-10-2009, 05:03 PM

i am heavily considering a 370. i've driven 3 370z's, first, a manual, then an automatic and then i went back and drove another manual. the reason i keep test drving them is because i needed to see if the rough engine and vibration in the shift knob was just in the first car i drove or was it a traight with all of them. when i first drove the car, i noticed a slight vibration in the shift knob of the manual. i honestly thought something was wrong because of the vibration i felt in my hand. that vibration disappeared with the auto. so i went back today at lunch and drove another manual and sure enough, i felt the vibration in my hand again. i could probably deal with it, but it would take some getting used to. as far as the engine, i didn't feel any vibration in the steering wheel or car, but all of them sounded rough when accelerating. it didn't purr like that g35's did when they came out. i currently have an 08 honda accord v6 coupe with a 3.5 motor. although my car has less power and torgue, my car is much smoother than the 370z. one of you guys talked about the size of the engine possibly beeing a culprit. based on what i've read, nissan probably should have kept the engine at 3.5 liters to keep the vibration down witout having to add so much counter balance. i don't know. i love the 370z and it's still on my list right now, but i will admit that coming from my silky smooth vtec v6 and drving my boys' bimmer 335, going to that rough engine would play heavy in my decision process. it's still a hell of a car though.

VTalumni · 07-10-2009, 05:16 PM

I am more concerned with the reliability of the automobile than the feeling when it is vibrating harshly. I mean is it going to shake things loose, destroy the engine prematurely, ruin the mounts, etc. Whether or not it is covered under warrenty, it would still bother me. You all think that is a concern?

need4speed · 07-16-2009, 01:07 AM

Quote:

Originally Posted by RCZ

Wow.

We aren't talking so much about sound here, its more the vibration at high RPM that bothers some of us I think. Just because its a sports car, it doesnt mean it should feel so coarse and out of control at high RPM. We go back to the same point over and over... and the fact of the matter is that an engine that is made to rev high and for sport driving should be MORE well balanced and exhibit LESS vibration. The engine internals are put through so much more stress, being a sports car and all, that it should be a LOT smoother to aid in its longevity.

Does that make sense to anyone else or is it just me being crazy?

I c wat u r saying and u do have a point. But one thing u first year buyers don't realize is.
Though the vq 37 is proven in the G37. Its still mated to a seperately programmed ECU,
New suspension and other components. So these parts are tested in pre production
But production brings forth new issues that must be resolved from the line up.
But guess who are the final testers??? First year buyers.
Cars like this are usually better bought the 1st year by serious tuners or people that don't drive fast but wanna sports car for show.
Reason being tuners will observe problems but they don't care too much cuz they are always trying to make the car better than production. And. Mild drivers. Well. They never put hard enough work in sports cars that they don't need max performance.
But in betweeners. Meaning, you might track here and there. Have a spirited driving style
And will use this car as a daily but. Won't go past suspension n bolt ons. Don't wanna void warranty. Will not do or are interested in tranny tuning or aspirating the engine.
I would suggest. WAIT FOR THE 2ND YEAR MODEL.
AND EVEN THEN. WAIT TILL UR TRUSTED MAGAZINE GIVES REPORT.
Its very common for 1st year cars to exhibit crudeness or harshness. 2nd n 3rd year cars are vastly improved. And the 4th year refresh is usually the sweetest.
I know some of you couldn't wait to get one and an extra year is long.
But tuners report back to companies n companies make fixes.
Novice racers win in year 2.

RCZ · 07-16-2009, 09:43 AM

Quote:

Originally Posted by need4speed

I c wat u r saying and u do have a point. But one thing u first year buyers don't realize is.
Though the vq 37 is proven in the G37. Its still mated to a seperately programmed ECU,
New suspension and other components. So these parts are tested in pre production
But production brings forth new issues that must be resolved from the line up.
But guess who are the final testers??? First year buyers.
Cars like this are usually better bought the 1st year by serious tuners or people that don't drive fast but wanna sports car for show.
Reason being tuners will observe problems but they don't care too much cuz they are always trying to make the car better than production. And. Mild drivers. Well. They never put hard enough work in sports cars that they don't need max performance.
But in betweeners. Meaning, you might track here and there. Have a spirited driving style
And will use this car as a daily but. Won't go past suspension n bolt ons. Don't wanna void warranty. Will not do or are interested in tranny tuning or aspirating the engine.
I would suggest. WAIT FOR THE 2ND YEAR MODEL.
AND EVEN THEN. WAIT TILL UR TRUSTED MAGAZINE GIVES REPORT.
Its very common for 1st year cars to exhibit crudeness or harshness. 2nd n 3rd year cars are vastly improved. And the 4th year refresh is usually the sweetest.
I know some of you couldn't wait to get one and an extra year is long.
But tuners report back to companies n companies make fixes.
Novice racers win in year 2.

You are serious?

Modshack · 07-16-2009, 09:57 AM

Quote:

Originally Posted by RCZ

You are serious?

LOL.....

wstar · 07-16-2009, 10:01 AM

07-10-2009, 05:03 PM	#3 (permalink)
iwantone09 Base Member Join Date: Jul 2009 Location: Atlanta Posts: 1 Drives: 08 Honda Accord cpe Rep Power: 18	rough engine i am heavily considering a 370. i've driven 3 370z's, first, a manual, then an automatic and then i went back and drove another manual. the reason i keep test drving them is because i needed to see if the rough engine and vibration in the shift knob was just in the first car i drove or was it a traight with all of them. when i first drove the car, i noticed a slight vibration in the shift knob of the manual. i honestly thought something was wrong because of the vibration i felt in my hand. that vibration disappeared with the auto. so i went back today at lunch and drove another manual and sure enough, i felt the vibration in my hand again. i could probably deal with it, but it would take some getting used to. as far as the engine, i didn't feel any vibration in the steering wheel or car, but all of them sounded rough when accelerating. it didn't purr like that g35's did when they came out. i currently have an 08 honda accord v6 coupe with a 3.5 motor. although my car has less power and torgue, my car is much smoother than the 370z. one of you guys talked about the size of the engine possibly beeing a culprit. based on what i've read, nissan probably should have kept the engine at 3.5 liters to keep the vibration down witout having to add so much counter balance. i don't know. i love the 370z and it's still on my list right now, but i will admit that coming from my silky smooth vtec v6 and drving my boys' bimmer 335, going to that rough engine would play heavy in my decision process. it's still a hell of a car though.

07-10-2009, 05:16 PM	#4 (permalink)
VTalumni Base Member Join Date: Feb 2009 Location: Germany Posts: 31 Drives: 370z soon to come Rep Power: 18	I am more concerned with the reliability of the automobile than the feeling when it is vibrating harshly. I mean is it going to shake things loose, destroy the engine prematurely, ruin the mounts, etc. Whether or not it is covered under warrenty, it would still bother me. You all think that is a concern? __________________ '98 Ford zx2 '04 SRT-4 '07 Scion tc

07-16-2009, 10:01 AM	#8 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	__________________ 7AT Track Car! Journal thread / Car setup details

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