Thoughts on Engine Sound at High RPM's (kinda long)

RCZ · 05-31-2011, 08:04 AM

haha, yeah the car is "rough" pass 4500RPM. You're not going crazy. The way it sounds and the way it feels are two totally different things. No one should appreciate an engine that feels like you're breaking it when you take it up in the rev range...which ours does.

I don't think its that we're hitting its frequency, it just feels rough. It does it for several thousand RPM and that should tell us its not just resonance, its just that the damn thing vibrates a lot. Be it from the vvel system or more solid engine mounts or what. I've had three types of flywheel on my car and they all made similar vibration at high rpm. You could say the stock fw feels more muffled because it doesnt seem to get transferred into the cabin and chassis as much, but its still there loud and clear.

I had solid transmission mounts installed a while back and the vibration was completely unbearable. At high RPM it felt like the world was ending. I think the best we're going to be able to do is isolate the vibrations as much as we can, maybe we can get some liquid filled mounts like porsche does... that gt3 feels like silk at 9k rpm.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
370z engine will last long?	The Rock	Nissan 370Z General Discussions	25	03-11-2011 02:59 PM
WTB: High Flow Cats or F.I. Long Tube Headers and Uprev	Mozen	Wanted	0	02-05-2011 12:59 PM
Long Tube Intake Sound	6spd	Intake/Exhaust	19	01-18-2010 08:55 AM
high frequency sound/annoying as hell sound	Santent	Nissan 370Z General Discussions	4	12-22-2009 09:59 AM

05-31-2011, 08:04 AM	#11 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	haha, yeah the car is "rough" pass 4500RPM. You're not going crazy. The way it sounds and the way it feels are two totally different things. No one should appreciate an engine that feels like you're breaking it when you take it up in the rev range...which ours does. I don't think its that we're hitting its frequency, it just feels rough. It does it for several thousand RPM and that should tell us its not just resonance, its just that the damn thing vibrates a lot. Be it from the vvel system or more solid engine mounts or what. I've had three types of flywheel on my car and they all made similar vibration at high rpm. You could say the stock fw feels more muffled because it doesnt seem to get transferred into the cabin and chassis as much, but its still there loud and clear. I had solid transmission mounts installed a while back and the vibration was completely unbearable. At high RPM it felt like the world was ending. I think the best we're going to be able to do is isolate the vibrations as much as we can, maybe we can get some liquid filled mounts like porsche does... that gt3 feels like silk at 9k rpm.