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Said it a million times.

The tutututu noise is when all the compressed air passes back through the turbo and out the intake after throttle body closes. A bov, in correct position, prevents this from happening. To a point.

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Airbox (small pipe off turbo with pod on it) with heaps of boost and no bov and you'll get your turkeys.

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  On 21/10/2011 at 10:45 PM, STAINLESS said:

Said it a million times.

The tutututu noise is when all the compressed air passes back through the turbo and out the intake after throttle body closes. A bov, in correct position, prevents this from happening. To a point.

If tutut is what's happening , its the pressurised air passing back over the turbine blades trying to stall the turbo. sounds good but the Bov idea is to stop this and reduce lag by keep the turbo spinning.

A bov with a tight spring wont do its job properly and too lose will lose boost.

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Take the hose out between the bov and the crossover and block the ends up with chair stoppers. You will get minimal flutter at standard boost levels anyway but this is how you achieve it, mine is fairly loud now, but also has cooler pipes and a replacement intake pipe

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  On 22/10/2011 at 12:53 AM, rab said:

If tutut is what's happening , its the pressurised air passing back over the turbine blades trying to stall the turbo. sounds good but the Bov idea is to stop this and reduce lag by keep the turbo spinning.

A bov with a tight spring wont do its job properly and too lose will lose boost.

Its not the turbine being effected its the compressor due to the intake air going backwards through it and stalling the turbo which makes the noise out the intake as stainless said. Otherwise the reduce lag bit and bov info is correct.

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The turbo does not stall, it's impossible for a turbo spinning at 20k + rpm to simply immediately stall due to the throttle plate being closed the inertia involved is simply too high for this to happen

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This would probably suck for a manual, but in an auto there is no issues during gearshifts as turbo stays on the boil

No dose in my car unless you lift your foot, throttle stays open when foot is flat to floor so no lag on gearshifts

Manuals FTL LOL

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