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Sure I've heard the noise, and I don't have to put my ear next to the throttle bodies. Is it indicative of anything wrong? Absolutely not. Enjoy the hassle of the dealer trying to get them to troubleshoot something that is completely normal. On the plus side, they might break something unrelated, so you need their service for real :eekdance: |
The TBs are never silent.
They are quiet(er) when they are new, but as they age and break in the noise becomes more prevalent. This is due to how they work, they're little DC motors that are having to hold the TB open against a spring. This creates vibrations that become more audible as the bearings wear in. There's seriously nothing to fix until the TBs begin to malfunction from bearing play or (more likely to be an issue first) the brushes wear out/get too dirty to function and the TB has to be serviced (replaced by the dealer, no one fixes them, they just R&R and send it off to be "recycled", but I have personally refurbed DBW TBs in my garage without issue). Again, it's a non issue and you can only hear it on this car more than others because the TBs are front and center, not covered up by feet of equipment to muffle the sound (and there's two of them). |
OH, and because this is one of the few cars without an under-hood heat and sound insulating pad.
If it had a half inch thick pad to absorb engine bay sounds you wouldn't hear the TBs at all. Nissan (incorrectly, apparently) assumed sports car owners wouldn't care that they could hear TB whine, relay chatter and other mechanical noises from their engine bays and decided to save that space that would be needed so they could make the hood lower profile, thus improving aerodynamics and aesthetics. |
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FWIW, the G37 has a pad, it also has a bulkier hood and no strut tower brace. The VQ37 is a tall motor, they had to min-max the entire design to meet design goals, random noises are a small compromise. |
this is the first time I've heard of people complaining about throttle body whine in a modern car
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Amazon.com: Thermo-Tec 14620 60" X 36" Heat and Sound Suppressor: Automotive
That would be my first choice. The Dynamat one is thicher, so you may have to do more trimming and shaving the foam down. Dynamat.com | The Hoodliner for Automotive and Restoration |
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