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Turbo 'whistle'

SoFreshSoClean
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SoFreshSoClean Proficient

SoFreshSoClean

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Hi all,

I have a R33 GTS25t with a GT-RS. I'm not sure what the issue is, but the turbo whistle is too loud. It basically sounds like its spooling, but happens at very very gentle throttle angles. Pretty much just off idle it starts, cruising at 110km/h its a constant whistle (i.e. really, really annoying).

Does anyone have any experience with this turbo? My mechanic suggested it was because I used to have a foam filter on which does not block any noise, however I changed it to a K&N item and it's only slightly quieter.

Other things I have pondered include the BOV leaking (its a standard item) and some sort of resonance in the intake piping. The second option doesnt really make sense though as the whistle happens all the way through the rev range. I'm just hoping its not a problem with the actual turbo.

It is getting tuned on Wednesday and that is one of the things my mechanic is checking, just wondering if anyone's been through this already...

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3LGODZILA Proficient

3LGODZILA

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seriously how can u not like the sound of a turbo spooling!!

yes the standard airbox will shut it up

and i remember SKYRYAN (from perth) in his forsale section a lil while back said he had a gt-rs and said its f**king loud, theres nothing wrong mechaniclly with it, thats just how those turbos are - fkn loud. throw him a pm might be able to help ya out

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l0WRB Mentor

l0WRB

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pretty sure u got a few grub screws in the front housing that holds the port shrouded cover in place... remove it and ur whistle will disapear..

i was running a gt3076r port shroud and i got over the whistle after a few weeks... only decent whistle is a hks t51r or t04z on 30psi bahah :D

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SoFreshSoClean Proficient

SoFreshSoClean

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any amount of opening the throttle will make it whistle away with a pod filter, like a mack truck

go back to the std airbox to shit it up and keep it quiet

Yeah, that might be the go. Pretty keen to keep it looking as stock as possible under the engine bay so that would tie in nicely.

seriously how can u not like the sound of a turbo spooling!!

yes the standard airbox will shut it up

and i remember SKYRYAN (from perth) in his forsale section a lil while back said he had a gt-rs and said its f**king loud, theres nothing wrong mechaniclly with it, thats just how those turbos are - fkn loud. throw him a pm might be able to help ya out

Its a bit anti social.. and plus I don't think the po po would appreciate it. Plus, its reaaaaally annoying on long drives. Acceleration spool is cool, yes. Constant drone, no.

If you get a Buzzz ..z zzz z.zzz sort of bearing noise on vehicle power off. It could be bearing noise. Which means they needs replacing.

Nah no noises like that to report..

Excuse my ignorance, but what is a port shrouded comp cover, what are its benefits and will it do anything if I remove it?

Edited by SoFreshSoClean
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greensa14 Collaborator

greensa14

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You wuill see on most larger sclae turbo the inlet has little holes or a lip in it. It is there to stop or help reduce compressor surge.

Due to the amount of boost these turbos run it help created a bit of turbulence and the air running over these "holes" is what is creating your whistle.

I am sure there is more to it, but that is my limited knowledge.

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andymoocow Grand Master

andymoocow

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Hi all,

I have a R33 GTS25t with a GT-RS. I'm not sure what the issue is, but the turbo whistle is too loud. It basically sounds like its spooling, but happens at very very gentle throttle angles. Pretty much just off idle it starts, cruising at 110km/h its a constant whistle (i.e. really, really annoying).

Does anyone have any experience with this turbo? My mechanic suggested it was because I used to have a foam filter on which does not block any noise, however I changed it to a K&N item and it's only slightly quieter.

Other things I have pondered include the BOV leaking (its a standard item) and some sort of resonance in the intake piping. The second option doesnt really make sense though as the whistle happens all the way through the rev range. I'm just hoping its not a problem with the actual turbo.

It is getting tuned on Wednesday and that is one of the things my mechanic is checking, just wondering if anyone's been through this already...

Its just the way GT-RS turbo's are. I have a GT-RS turbo with a APEXi pod filter, and YES it is extremely loud whistling noise. On a long drive it does get annoying, but my exhaust is pretty loud too, so it drowns it out a bit, and i always have my stereo at a decent volume so it does not bother me too much.

Put a stock airbox with snorkel back in and there will be ZERO whistle. But the trade off is you can hardly hear your turbo at all........

At first the whistle was a bit much, but its grown on me nicely. I borrow my mates ute sometimes and he takes my car, and he freaking loves it, even if he does not have to go anywhere he goes for a drive...... so whatever floats your boat i guess.

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Harey Veteran

Harey

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Hahaha yeah you dont mind hearing a turbo whine when your giving it some stick, but not when your just cruising on the highway. As said previously, stock airbox will stop the noise.

Other option is to get a bigger turbo that doesnt spool when cruising on the highway :happy:

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SoFreshSoClean Proficient

SoFreshSoClean

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You wuill see on most larger sclae turbo the inlet has little holes or a lip in it. It is there to stop or help reduce compressor surge.

Due to the amount of boost these turbos run it help created a bit of turbulence and the air running over these "holes" is what is creating your whistle.

I am sure there is more to it, but that is my limited knowledge.

I see, thanks for your help

Hahaha yeah you dont mind hearing a turbo whine when your giving it some stick, but not when your just cruising on the highway. As said previously, stock airbox will stop the noise.

Other option is to get a bigger turbo that doesnt spool when cruising on the highway :)

Yes! You get it.. cruising noises are just irritating. GT-RS was chosen because it has similiar lag to standard.. it passed over the pits but will still flow 400hp :happy:

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