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Discussion Starter #1 (Edited by Moderator)
Hi all ~ new member here! I purchased my 2018 Q60 Silver Sport pre-owned last November with 18k miles on it. I enjoyed it since but...

Over the past few months, I have been hearing about some siren/whistle like noise when I hit the gas harder than usual. Maybe it was there when I purchased the car, and I thought it was normal, but it has been concerning me recently. Sometimes its faint, sometimes its not. I should note that I only hear this noise when I accelerate harder than usual. When I'm cruising or accelerate normally I don't really hear it. I've tried turning off the fake exhaust note (ANC/ASC settings) and it made no difference. I'm not sure what's going on, could it be turbos failing? I uploaded my video clip below.

I should also note that the previous owner seems to have modified the exhaust/muffler system. I'm not too familiar with car mods, but it looks like he deleted the muffler and welding the pipes? It does sound good, but is it done right and could it be the issue? Pictures attached for reference. I'm not very tech savvy with cars so I could use some help as to what I should do. Could the sound be exhaust or turbo related? Should I be concerned? Thanks in advance!

https://youtu.be/9ABTC7PZ_0A
 

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I think another member had an issue with an O2 or some other sensor falling out.
 

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Welcome to the forum!

I would definitely take it to an exhaust shop and have them look at the gaskets and welds as well. You should also check if the previous owner tried installing BOVs (blow off valves) or modified the factory intake/BOV set-up.
 

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Are you sure it's not a squealing belt? I had an issue with mine where the belt would squeal under hard acceleration. The dealer took care of it under warranty.
 

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Discussion Starter #5 (Edited)
So I took it to the Infiniti dealer. One of the techs drove it and heard the sound, though it wasn't as audible as my video clip above. He said it might be turbo related (honestly he didn't seem too sure). He did not check anything else to my knowledge (engine, sensors, belt, exhaust, etc.)

The service manager offered to replace the turbos under warranty. He said this is the first turbo replacement he's seen for a 2018 Q60. He said they will have to drop the entire engine and its a 2 day job. Wow!! It all seems very complicated to me; what if it was never the turbos causing the siren noise? Do you guys think its worth doing this replacement, or is it better to leave the engine alone? I don't want to cause other possible issues by dropping the engine. My car has close to 22K miles on it. Or should I get it inspected at another shop for the belt, exhaust, O2 sensor etc.? Or just live with the sound lol!
 

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Are you sure it's not a squealing belt? I had an issue with mine where the belt would squeal under hard acceleration. The dealer took care of it under warranty.
Never mind, I couldn't hear the youtube video at work. It's definitely not belt related. Hope the new turbos solve the problem!
 

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Even under warranty I would hate my baby to go through a Turbo rip out. I suggest getting a second opinion from another good Infiniti Dealership before having a major Thoracic Aortic Dissection Repair operation...
 

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Discussion Starter #8 (Edited)
Even under warranty I would hate my baby to go through a Turbo rip out. I suggest getting a second opinion from another good Infiniti Dealership before having a major Thoracic Aortic Dissection Repair operation...
That's what I'm leaning toward. I might cancel the appointment. Who knows what else could go wrong by dropping the whole engine and putting it back. Do they mess with the transmission and subframe as well? Is it worth it? I don't know the intricacies but it sounds like a major job for a car thats barely 2 years old.

Anyone else have experience dropping their engine and/or replacing turbos?
 

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That's what I'm leaning toward. I might cancel the appointment. Who knows what else could go wrong by dropping the whole engine and putting it back. Do they mess with the transmission and subframe as well? Is it worth it? I don't know the intricacies but it sounds like a major job for a car thats barely 2 years old.

Anyone else have experience dropping their engine and/or replacing turbos?
Another member had his engine dropped and posted pictures. Can't remember the issue. Try using the forum's search feature.
 

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Man.....I feel for you. I am all too familiar with failing turbos. I had a N54 (BMW tt engine) and the stock turbos failed and then I purchased a prototype from a supplier who was coming out with a stage 2 upgrade and they failed TWICE (he had a machining error each time when I sent them back to be warrantied) and finally my 3rd time swapping the turbos they were fine. So to me even though the video is hard to hear it COULD be the turbos.

Typically, when I had the siren it was accompanied by more smoking from the exhaust bc of the turbos seals leaking oil and also some oil at the tips of the exhaust. Do you have either going on too? If not.. it still does not negate failing turbos. Only sure way is to pull them off and see if there is any shaft play too.

I did my swaps a few times until I got irritated and said let a shop do it lol. Each time I dropped the subframe. It was just way easier to have more room. I suggest getting a hoist and HOLDING the engine in place so you dont have to move it (but again not sure if that's the best option for the VR30 since I haven't gotten into its guts yet lol)
 

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Yikes.... sounds like turbos. That happened to me (and at around the same mileage).
 

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I just got my 2017 3.0 premium with 27k miles about 3 weeks ago and the car has already been to the dealership for the whistle, which I would describe more as a screeching sound, under hard acceleration. The first time I thought it was the drive belt, the tech was not able to replicate the sound, but adjusted the drive belt .5mm per a service bulletin. They found the drive belt in good condition so they didn't replace it. Now a few days later it's doing it again, seems like it happens when the turbos kick in for a brief moment. I tried to listen to that YouTube vid but it's no longer available. Ha anyone else had the issue? If the culprit isn't the drive belt then is it probably the turbos?
 

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Check all of the clamps for the tubing between the turbos and throttle bodies. I had the "air horn" noise when my dealership did not properly reinstall a clamp following a spark plug change.
 
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