Hey everyone, I'm new to the site. I purchased a 2013 g37 black sedan back in June and I recently started to do work to it.

I just put on my R2C intakes about 2 1/2 weeks ago. Install was as straight forward as can be, and the whole first week they sounded ridiculous. But lately for some reason the sound seems to of gone away or gotten quieter. Everything is still nice and tight on there so I'm not sure what the problem could be. I can still hear them but no where near as dramatic as it was.

any ideas?

 

Maybe you have just gotten used to the noise?

 

Mash the peddle...it will roar again

 

+1^^^

 

You're just used to it, is all.

Try removing the hood liner. Its sole purpose is for sound-deadening, so if you want to hear what's going on under the hood...

 

At the risk of being off topic, I want to take a second to address this half truth. And who better to respond to then the resident voice of wisdom and reasoning? The insulating hood liner is designed to decrease noise levels, but also to protect paint from engine temperatures.

One could argue about the degree (pun intended) to which the heat affects the paint, but that would just be semantics. The life of the paint on the hood is increased by reducing temperatures from the engine bay. Adverse effects due to an increase in hood temperature once the lining is removed may not be something quickly noticed. Own your car for 20k miles? You may never even see it. However, peeling paint or degraded clear coat aren't the only diagnostic signs of this effect. Some other issues are much more subtle. For instance, all those rock chips will become more and more prevalent as the paint is compromised.

Something to chew on.

 

The bare underside the the 370Z disagrees with that assumption.

 

I do believe the GTR also has a bare hood. I think with the G37 being a "Luxury Coupe/Sedan" they wanted to quiet things down a bit. I just don't have anywhere to keep the large hood piece in my garage!

 

No, it has a liner. At least, from what I could see online. But I agree... being a "luxury" brand car is the raison d'etre.

OP, it was just a suggestion. Remove it, don't remove it, remove it and then put it back. Your car, your choice. Just throwing it out there as an option, and a common option that a number of people take.

Nelledge, don't remove your liner. Don't do it! Not in that Texas heat.

 

Seems like I struck a chord. It wasn't a personal contradiction. However...

I'll be your huckleberry.

Let's see, we can roll with my assumption based on experience and knowledge in automotive manufacturing, acoustic properties, and heat transfer. Or we can go on your assumption which is just pulled out of your ****. Pick your poison.

You think the liner in the GTR is solely for sound insulation? Doesn't make sense considering the physics of sound propagation. What makes more sense? Addressing heat transfer by radiation.

I honestly can't speak for the 370z. Thankfully, I didn't. Different paint? Different hood shape for increased convective cooling? Different hood construction for increased insulative properties? Thermal reflective coating? Who knows? I'll stand by statement. Hood liners have been designed for sound and heat insulation for decades. Physics will be physics. You leave yours off. I'll leave mine on. I can roll my windows down anytime I desire more noise. I'll never freeze my glutes off down here.

 

If there were a heat issue, then everyone who's painted their engine covers would be seeing blistering paint or worse.

Until I see a melted/blistered engine cover, I wouldn't worry about the paint on the hood w/o a liner.

 

Well, that's an interesting consideration. You know, I spray painted the center section of my engine cover with a rattle-can from Lowes over two years ago. Still waiting for it to bubble and peel. Perhaps since I removed the sound-deadening material, there's a little less heat in the engine bay, and that won't happen? But then, to make that proposal allows for the possibility that the sound deadening panel actually has an impact on heat transfer... and that would be anathema to my assumptions. And let's be honest, who here wants *less* heat in their engine bay? No, wait...



IDK, man. So many things coming out of my ****, I can't keep track.

If only someone here had vast knowledge in automotive manufacturing, acoustic properties, and heat transfer, then that person could respond with some more guesswork masqueraded as educated answers. After all, that's what I'm doing.

Except that my guesswork makes more sense.

 

It's ok. There are thousands of things I don't know about IT junk(or software development, or whatever it is). We each have our own wheelhouse. And we are allowed to disagree.

Have a Snickers. The weekend is on the horizon. Just PM me if you would like to argue more about it. Pig in mud. Back to the OT.

I agree with those that have stated your reference point has been altered, and your ears have acclimated. Heartbreak of modding: There is always a better mod.

 

Car forums... LOL