24 FL5 squealing when letting off accelerator

[007]

Interesting thread. While it may not be much help, since some have mentioned wastegate noises as a byproduct of turbocharged engines, I can confidently say it’s not common. I’ve had zero wastegate noises in my GRY and my M2C. None. This coming from someone who is meticulous about nvh and highly attuned to any sounds. Such noises would definitely drive me nuts.

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[Giant Wonton]

I have this exact noise and it drives me nuts. I wish there was a fix. The dumbass dealership said it was a part of my aftermarket exhaust lmao.

 

[FL5Frank]

Normal my fk8 did it

now my fl5 does it

Makes car sound cheap ass he’ll but it’s the wastegate

 

[Cap]

I'd describe this more as a scraping noise vs. a squeal (if its the same thing I'm experiencing). At first I thought it was something stuck in the brakes but then I noticed it was every single time I'm off throttle. Sounds like crap. ?

 

[cryptolime]

i recognize that sound. that's the wastegate actuator and it's normal to sound like that. I hit the rev limiter pretty hard around 8k miles and it disappeared until i did the CRC IVD Turbo/Intake Valve Cleaner service at 14k miles.

 

[infiniteraiders]

I noticed a sound when I let off the gas as well.. I don't recall hearing this on my FK8. The only change I made was the K&N filter. I'll try to swap back to stock and see if it's still there.

Do you have any mods under the engine?

 

[jcm]

2025 fl5 700 miles, started noticing this "hissing" or "whistle" noise, while lifting engine breaking during downshift blipping gas moving to third and lifting off of gas although breaking makes the sound disappear faster likely due to moving through the rpm range that produces the noise faster during breaking, had me a little concerned about power train/possibly considered that this was normal break-in noises, does occur in 1-4th gear, strangely enough occurs less during initial warm up after a cold start, much more audible when engine breaking after warmed up and coming from decent load, don't have a microphone yet to observe more closely but it sounds like a lubrication related issue metal-on-metal or similar. anyone have any luck with a fix yet?

 

[lilDumpsterRat]

2025 fl5 700 miles, started noticing this "hissing" or "whistle" noise, while lifting engine breaking during downshift blipping gas moving to third and lifting off of gas although breaking makes the sound disappear faster likely due to moving through the rpm range that produces the noise faster during breaking, had me a little concerned about power train/possibly considered that this was normal break-in noises, does occur in 1-4th gear, strangely enough occurs less during initial warm up after a cold start, much more audible when engine breaking after warmed up and coming from decent load, don't have a microphone yet to observe more closely but it sounds like a lubrication related issue metal-on-metal or similar. anyone have any luck with a fix yet?

yes exactly, it worried me because I thought it was somethign in the transmission or lsd, so this high pitched metal on metal squealing sound is somehow related to the wastegate actuator? Why does the sound go away when you're not engine braking, or decellerating in gear off throttle.

 

[randica]

The Subaru I had prior to the FL5 made the same wastegate rattle. It's normal

 

[LogicalCC]

Bump…glad I found this thread.

I just got a 2025 FL5 and it is making this exact sound. I can live with it if normal, which sounds like it may just be the nature of the beast.

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