Weird Noise Reason - 2010 INFINITI G37 SEDAN

[spring patrol]

Here attached is a video with the sound that’s happening (please excuse the wind it’s a windy day today.) Mileage is 103k on the chassis and transmission, but engine was swapped for the same VQ37VHR motor with 52k miles. The sound was before and after the new motor. The sound has only gotten louder over time and has reached its peak. It’s very obnoxious. It has been like this since last September and it hasn’t affected the driving capabilities of the car. I just want to know what’s maybe causing the sound and how I can fix it.

[granite wolf]

Is it only while at idle?

Could be a pulley

[spring patrol]

it’s even while driving ? i’m not sure if it’s a pulley cus remember i did an engine swap and it has the same sound

[granite wolf]

Did u swap ur ac, ps and alternator?

It is either a pulley or ur engine

As it is rhythmic

[spring patrol]

what do you think is wrong with it?

cus when i open the hood and put my ear next to my engine i don’t hear it as loud as under the car

and i did not swap my alternator

[granite wolf]

Probably a pulley then

[spring patrol]

the guy just compressed my ac more

would there be a chance of an exhaust leak?

or a bad cat

[granite wolf]

No

[granite wolf]

No

[spring patrol]

hm is a pulley an easy fix or expensive ?

[granite wolf]

Well maybe

It could be

I don’t think though

[spring patrol]

that is weird thi

cus the sound happened before with the old engine

and after with the new engine

like i got new engine and new pulleys and everything

[granite wolf]

Maybe they reused the exhaust gasket and it didn’t hold up after being put back on

[spring patrol]

exhaust gasket? what’s that

[granite wolf]

Check for that, but also check ur pulleys

[spring patrol]

i’ll look at the pulleys.

dailying the car for the past couple months

[granite wolf]

Let me just send a video

[spring patrol]

okay lemme go start her up

i don’t hear it rn

cus the car is cold

so that’s another point to make

the sound isn’t noticiable while the car is cold

[mild tundra]

GG @spring patrol, you just advanced to level 3! Chat more to level up and earn top roles!

[spring patrol]

but doesn’t this only matter if you took apart the engine ?

cus it was never taken apart it was just our with the old and in with the new

[spring patrol]

plug in the wires and electrical system connect to tranny and that’s abt it

[granite wolf]

No

[spring patrol]

i see

i sent u the video of the engine pulley

[granite wolf]

They will reuse the exhaust

[spring patrol]

you could see the belt moving

[spring patrol]

oh okay!s

so you think it’s an exhaust issue ?

[granite wolf]

Either pulley or exhaust

Imo

[spring patrol]

yeah i hear it when i put my ears next to the wheels

but not when i am near the engine bay

[granite wolf]

Weird

[granite wolf]

Probably a exhaust leak on your down pipe

I would check it for a leak with soapy water

[spring patrol]

how do i do that check?

https://www.z1motorsports.com/z1-products/z1-motorsports/z1-g37-coupe-cat-back-single-exit-race-exhaust-p-32177.html?list_name=CategoryCatBackExhausts&oid=32177%3A0%3A83463%3A11&qid=5b37f6ef5dd86e2f9adf7337ac189302

would something like that fix it ?

[granite wolf]

Do you have any lights on the dash? To check for a exhaust leak just spray soapy water on your exhaust and if it bubbles that means exhaust gases are escaping

[granite wolf]

U could fix it probably with just a new gasket

Also do u smell any like sulphur or rotten eggs

[spring patrol]

no not rlly

[granite wolf]

?

[spring patrol]

not much of a smell unless i like go 6k rpm

[granite wolf]

If it is leaking through a gasket

[spring patrol]

sorry sorry sorry

i replied to the wrong message

[granite wolf]

Np

[spring patrol]

i meant thag to the smell

i don’t smell anything unless i’m at high rpms

which is normal

[spring patrol]

no lights on the dash

[granite wolf]

#https://m.youtube.com/watch?v=N-exs1iMLFU

Follow Chris fix’s video

[granite wolf]

K good

Just checking

[spring patrol]

yeah ofcourse !

this is very weird

[granite wolf]

So ya either a leak or a pulley. U are saying it ain’t really coming from the bay so I think it is your downpipe gasket gone bad

[spring patrol]

yeah maybe

would just getting the new catback exhaust fix it?

cus ik itll also give me like 12 hp or sum and a much better tone to the engine

[granite wolf]

I mean a gasket would fix it

[spring patrol]

how much is a gasket 😭

[granite wolf]

U don’t need a new exhaust

[granite wolf]

Bro like $5

[spring patrol]

ahhhh i see

would u have to take apart the exhaust to get to the gasket?

like in other words can me, a 16 yo kid do it or do i need help?

[granite wolf]

Ya, I mean first check if it is a bad gasket

Watch the video with Chris fix checking for leaks

And then see what gasket is bad

Also spray on your headers

[spring patrol]

ok

i’ll do that maybe tmr cus i’m off school tmr

[granite wolf]

It will give u maybe 2whp

Or less

Modern cars are pretty efficient to begin with, if u delete ur cat and do a full tune u will maybe make 5 more whp

[spring patrol]

yeah i guess but it’ll sound much cleaner

[inner drum]

I'll warn you, exhaust manifold gaskets on VQs are NOT fun. Do NOT disconnect the cats from the manifold, just disconnect the cats from the Y pipe and the manifold from the block. Your manifold studs should be rust-free since Nissan did something decent with their lives, but the Y pipe bolts will be bad. It took me around 16-17 hours to do a Long Tube Header install on my 370z, because the bay is so ridiculously tight and hard to work around. Drivers side is worse than the passenger side, but both will suck. Watch a youtube video on how to install Long Tube Headers (I think TheCarizon on YT has a very good video on it), that will show you how to remove your manifold. In all honesty, I wouldn't do it myself unless I absolutely had to. it sucks. I haven't even watched your video yet, but lemme try

[granite wolf]

I mean I just told him to check for leaks first

My brother has a g37 and it ain’t that bad. Penetrating fluid, a ratchet and hammer will get u through the job with ease.

[granite wolf]

16-17 hours?!?!?

[granite wolf]

U should have seen my skyline’s exhaust. Seemed to have a coolant leak that dropped directly onto the down pipe bolts and part of the header. Had to drill 2 of them and use a retractor kit to get em out 💀

[spring patrol]

oh gawd. ya i’m gonna see if my mechanic wants to do it for me 💀

he does things for cheap so maybe 15 for labor and 5 for the part or whatever

[granite wolf]

Ngl it ain’t that bad. Especially depending on where the gasket leak is on the exhaust

[spring patrol]

ok so. news.

it’s the cats.

both of them.

i didn’t get an engine light so the cats are working but they just make the annoying sound

it hasn’t done anything to the performance of the car

i need opinions on what cats i should get… that is cheap but also would do it’s job and make the VQ sound nicer.

Woosphy Catalytic Converters Set Front Left & Right Replacement for Infiniti G37 3.7L 2008-2013 12H5484 12H5485 https://a.co/d/5EHKjEj

[granite wolf]

@spring patrol is it the cat gasket or the cat???

[spring patrol]

the cat

@granite wolf

[quartz musk]

time to get highflow cats

[spring patrol]

@everyone will it pass inspection in texas ?

[mild tundra]

GG @spring patrol, you just advanced to level 4! Chat more to level up and earn top roles!

[granite wolf]

Yes

[spring patrol]

awesome

wait wait wait wait wait @granite wolf

i sent the wrong link

https://www.z1motorsports.com/cats-and-parts/kinetix/kinetix-370z-g37-high-flow-cats-p-4204.html?list_name=Related+Products

this one is the one

[spring patrol]

would this pass inspection? or throw up any engine codes ?

[granite wolf]

High flow cats are meant to function the same as normal cats but allow a better flow. It shouldn’t throw any codes and u should be able to pass inspection

[quartz musk]

I also got a g37 let me know how the high flow cats are I might buy them

[granite wolf]

I wouldn’t make a vq any louder unless u have too

[quartz musk]

I wanna tune it

[granite wolf]

How on a n/a v6. A vq, a newer engine that has great flow already. How is a high flow cat gonna do much?

Cat deletes are for turbo charged cars

[quartz musk]

For the pop and flame tune you wanna get rid of cats

[granite wolf]

I guess if you want that, it will sound pretty bad though.

Straight piped v6s sound really bad

[quartz musk]

Yeah but flames

Also I dont mind being obnoxious asf

[granite wolf]

U do u

[quartz musk]

I wanna be heard 14 blocks away

[granite wolf]

For me I wouldn’t want a car sounding like it is part of a school band

[quartz musk]

I don’t care about sound I just want it loud

[granite wolf]

Odd

[quartz musk]

It’s more fun

Having a loud ass car

[granite wolf]

My na rb will sound loud with itbs and a full hks setup. Still will have a high flow. Since I don’t want rasp and don’t want it too loud. Trust me u don’t want a shitty sounding car. Better to have a medium nice sounding car than a loud and completely shit sounding.

My brother’s g37 with a new rear exhaust already sounds like a trumpet; can’t imagine it with a cat delete. I would shun him.

?

U trying to send a video

[quartz musk]

Won’t let me post vid

[granite wolf]

Trust me I know how a vq sounds

[quartz musk]

It’s a different exhaust pattern

Cause it’s a IPL

[granite wolf]

Bro it’s the same engine layout

[quartz musk]

Yeah but different pattern changes noise

[granite wolf]

Not that much

They sound pretty similar, as the piston firing pattern is the same.

[quartz musk]

Plus I hit redline in the video and didn’t shift so good thing it won’t post 💀

[granite wolf]

Reason why a rb and vq sound so different. Have the same amount of pistons but have a different layout and firing order

[granite wolf]

Ya not my taste at all, too much rasp

The cat will not help with that

It will make it much worse, I would look into getting a resonator

Bro you friend has a engine light btw 😂

[quartz musk]

I do too 🤣

Yeah I’ve heard of vibrant resonators but idk lol I like it loud

[granite wolf]

Bro it still keeps it loud just gets rid of that rasp

[quartz musk]

I need tires first lol my shit bald

I be drifting in the rain tho

I think I got something wrong my with sensors I feel like my car run outa gas to fast

[spring patrol]

would the highway flow cat give me some good sound ? if so what’s an example?

[spring patrol]

high*

also would i need to tune my car ? or it’s just put it in and ur good

@everyone

[granite wolf]

U will need a tune if u want to take from the benefits of a high flow

It will sound louder and more raspy like hydroids car

[quartz musk]

I don’t have muffler or resonator

[granite wolf]

That is what I am saying

Cats act quite similar to a muffler and when removed or replaced with high flow; your car will be louder and more raspy

So it will sound similar to your car hydroid

Maybe a bit more quite but still similar

[quartz musk]

Yeah def be quieter tho

I think ima get test pipes and then Throw on vibrant resonators

Then get flame tune

[inner drum]

If you have a stock exhaust, and just throw on high flow cats, your exhaust will be high pitched and raspy, (see here: https://www.youtube.com/watch?v=prGhaBiIMkI). You do not HAVE to get tuned, however you will get a check engine light and no noticeable gains. If you have an aftermarket catback, you'll have to look it up yourself. In my entirely honest opinion, if you're going to buy Hihg flow cats, you'd be better off getting catless longtube headers. ISR has some for $700 that sound great. Test pipe install is arguably worse than long tubes, because of the "Demon Bolts" connecting the cats to the headers'

[spring patrol]

the thing is @inner drum i don’t got that typa money man. that’s why i’m going for some decent but cheaper option

soemtjing thag will do the job. stop the rattling and will make it sound better than stock

and abt the CEL on this specific one i was looking at all the reviews say it doesn’t pop the cel

and has oem 02 sensor spots or whatever

[inner drum]

high flow cats cost the same as ISR long tube headers. You might be thinking of test pipes, which are just cat deletes, but yeah, high flow cats aren't cheap

[spring patrol]

what abt these ?

https://www.z1motorsports.com/cats-and-parts/kinetix/kinetix-370z-g37-high-flow-cats-p-4204.html?list_name=SearchResults&oid=4204%3A0%3A83460%3A11&qid=2ac2e2ace3cf9a0dde0d0c5ad4183342

or

https://www.isrperformance.com/isr-performance-high-flow-cat-nissan-370z-infiniti-g37/

which one do you guys think is better ?

[inner drum]

My entire exhaust is ISR (Long Tube Headers, Y pipe, Y Back) so I'm a bit biased towards them, I'd go with them. High quality for the price you pay

[quartz musk]

What’s the difference between long tube headers and test pipes I was going to get some test pipes to shoot flames