BOV sound but i don't have a BOV!!!
#1
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It's been a while, but i thought it was normal.
I believe it's been going on ever since i placed thinner oil in the car (0w~40 Mobil 1)
If i floor it, i hear the turbo (that sssssssssssss sound) and once i let off the throttle/shift there is it wooooooooosh (just like a BOV). But i don't have a BOV.
Is this a sign of a failing turbo? do they get noisy on boost?
Oil consumption is ~average (accoriding to the manual 1L/1,000kms) when i get much more than that (~3,000-6000kms/liter depends how i drive the car)
No smoke on boost............no CAT, just a straight pipe..........but that sound wasn't there, started a few months back when changed the oil (but getting a tad louder these days).
I believe it's been going on ever since i placed thinner oil in the car (0w~40 Mobil 1)
If i floor it, i hear the turbo (that sssssssssssss sound) and once i let off the throttle/shift there is it wooooooooosh (just like a BOV). But i don't have a BOV.
Is this a sign of a failing turbo? do they get noisy on boost?
Oil consumption is ~average (accoriding to the manual 1L/1,000kms) when i get much more than that (~3,000-6000kms/liter depends how i drive the car)
No smoke on boost............no CAT, just a straight pipe..........but that sound wasn't there, started a few months back when changed the oil (but getting a tad louder these days).
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The vacuum lines/pipe/hoses are all checked on.
But i am leaning towards the very thin oil that i am running that's causing this.
On boost, you can hear the turbo spinning, once you let go off the throttle, you can hear it stopping/slowing down (causing a woosh like a BOV).
But i am leaning towards the very thin oil that i am running that's causing this.
On boost, you can hear the turbo spinning, once you let go off the throttle, you can hear it stopping/slowing down (causing a woosh like a BOV).
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Oil shouldn't have anything to do with the sound. There has to be a leak of some kind, the stock intake system pretty much kills any and all induction noise.
If you have a cone filter in there you might hear something, and with a MAF or MAP system the whooosh will be definately audible.
If you have a cone filter in there you might hear something, and with a MAF or MAP system the whooosh will be definately audible.
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#8
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Gauge reads normal, no vacuum leaks...........started since using thinner oil..........![Frown](https://rennlist.com/forums/images/smilies/frown.gif)
New DV, Vacuum lines, Boots etc.....
Sound is definately comming from the turbo area (could be the DV? but it's a few month old).........
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New DV, Vacuum lines, Boots etc.....
Sound is definately comming from the turbo area (could be the DV? but it's a few month old).........
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Its new.........
OIl consumption when off boost is great (almost zero) when pushing it REALLY hard for long times, it goes quick, so i don't think the turbo bearings are cooked. Using the turbo every now and then is fine, no oil consumption. But when using it alot (ie it gets hot) oil cnsumption is high.......
I am suspecting the blades failing, but why ONLY when i let off the throttle? on boost the turbo sounds normal.........
OIl consumption when off boost is great (almost zero) when pushing it REALLY hard for long times, it goes quick, so i don't think the turbo bearings are cooked. Using the turbo every now and then is fine, no oil consumption. But when using it alot (ie it gets hot) oil cnsumption is high.......
I am suspecting the blades failing, but why ONLY when i let off the throttle? on boost the turbo sounds normal.........
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Originally Posted by 9fitty1
Your impeller will not make any sound even when it is throwing itself apart.
~Eyal
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But why would the sound come on only when off throttle/shifting?
If the impeller blade was worn, it would be noisey at all times right?
If the impeller blade was worn, it would be noisey at all times right?