no clue hahaha

 

yep i get this sound all the time - i quite like it though!

 

like previously stated, the issue should be looked over by a specialist because this can be from a number of things. It depends on how the car is driven, shifted, and how many miles the car has. If the miles are low on the car or you abuse the car too much it could be the clutch. since the clutch would make a similar sound when its worn or not broken in correctly and slips. Also if you rev the engine high at low gears and let go the gas pedal and shift simontaniously, the amount of force will cause the engine to violently kick back, which doesnt sound like a blow off valve.

 

Dealer tech today says it's the exhaust resonator, the sound is normal.

I don't see "resonator" on the exhaust diagram but I assume it's the same as the "front muffler" based on what I've read elsewhere about resonators. Can anyone confirm?

 

Wait Exhaust resonator? What resonator? my sound is coming from the front where the flex joints are not at the back.

 

Mine does the same thing and I might sound like a dumas but I think it sounds cool, reminds me of my turbo 240sx hehehe, but I think it has something to do with the emissions allowing the engine to utilize less than 6 cylinders to be more efficent, save gas on the unneeded cylinders because it is only heard at low to mid throttle. IDK but only a Infiniti tech can answer this I guess.

 

Here's my wild guess on why it happens at or close to WOT.

The amount of air sucked in at those rpms causes a huge rush of air up the intake tract, when the tranny shifts and the engine load changes, there's a temporary "break" in the suction, causing a vacuum and thus causing the whoosh sound when the next gear engages and the engine resumes the sucking of air.

 

^ I would agree with the above, I have the noise and it is clearly coming from the intakes, I don't think it's the clutch and I don't believe that it is a problem or something that has to be fixed.

 

I'm not sure it's a vacuum caused by changing gear either, as when I hear it, I can 'modulate it' with the throttle. It sort of sounds like a turbo spooling at times. Still weird. Sounds funny at first, and you think "aye, aye, what's going on here", but you get used to it! It is DEFINITELY nothing to worry about!