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Turbo flutter at low boost

Ottdurr

By Ottdurr,
in Four Door Family & Wagoneers

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Ottdurr Contributor

Ottdurr

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I know it's an age old argument that turbo flutter may damage the turbo over time, but I want to know if it can still damage the turbo if it only flutters at very low boost?

Recently got a new BOV and I've adjusted the pretension spring so it only "blows off" above 4 PSI, which means if I release the throttle at ~2 PSI I get a nice fluttery Su-tu-tu-tu which my inner 14 year old self loves. My logic is that surely this couldn't possibly damage the turbo like 14PSI with no BOV could. What do you reckon?

20200125_134046.jpg

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GTSBoy Grand Master

GTSBoy

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Posted (edited)

It's a myth anyway. That myth is not the reason that Nissan fitted compressor bypass valves to our engines. They make the engines work better.

Externally venting BOVs do not make them work better in the same way. In fact, if you still have you AFM, they make them work worse.

Edited by GTSBoy
Ottdurr Contributor

Ottdurr

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3 hours ago, GTSBoy said:

It's a myth anyway. That myth is not the reason that Nissan fitted compressor bypass valves to our engines. They make the engines work better.

Externally venting BOVs do not make them work better in the same way. In fact, if you still have you AFM, they make them work worse.

It's a dual port BOV with 25% venting to atmosphere and 75% plumb back, hasn't thrown a check engine light or anything so it seems the sensors are happy

GTSBoy Grand Master

GTSBoy

Posted
Posted

It won't even throw a CEL on any Skyline, even if it is 100% venting. But it sure as hell f**ks with the fuel-air ratio when it vents.

Those hybrid BOVs that vent and recirculate are the most wanky of all. They are only to make the noise, whilst trying to keep the ECU and fuelling happy enough to cut out all the horseshit that a venting BOV causes.

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