Is turbo "flutter" bad?

Was watching this video on youtube earlier today and was reading some of the comments left. Got me thinking is turbo flutter bad for your turbo? Im assuming the car in the video has no bov?

Reason i ask is that i am planning on going single turbo next year and just wondering if fitting a bov is essential.

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Cheers guys

I'd liek to know also, i get this on a bpu tt with stock recirc and aftermarket bov

It's not going to kill the turbo straight away, but it can cause other problems on high boost applications. I've heard of intercoolers having holes blown in them because of the pressure in the turbo system.

The Supra in the video probably does have a BOV, but because the 2JZ engine flows so much air there are very few BOVs that can cope without a little bit of compressor stall.

Mine does it and I'm not too bothered.

I thought the noise you can hear in the vid was a BOV!!

If its not that then what is it??

Just for my own record a BOV is also called a dump valve, isn't it?

I thought the noise you can hear in the vid was a BOV!!

 

If its not that then what is it??

 

Just for my own record a BOV is also called a dump valve, isn't it?

It's compressor stall, and yes, a BOV is sometimes known as a 'dump valve'

Compressor stall is caused when the pressurised air in the turbo system tries to move back through the turbine vanes while they're still spinning when you come off the throttle. The vanes chop through the air, and that's the noise you can hear.

Are certain bov better at dealing with this than others then?

If so which one is the best?

It's compressor stall, and yes, a BOV is sometimes known as a 'dump valve'

 

Compressor stall is caused when the pressurised air in the turbo system tries to move back through the turbine vanes while they're still spinning when you come off the throttle. The vanes chop through the air, and that's the noise you can hear.

Well I never stop learning around ye lot!

I always thought that noise was from a particular design of dump valve.

I have a terrible feeling I'm going to break my TT engine very quickly due to my total ignorance.

I have an terrible feeling I'm going to break my TT engine very quickly due to my total ignorance.

You'll be fine if you carry on reading on this site it takes quite a bit of abuse to kill a 2JZ-GTE if it's properly maintained.

You'll be fine if you carry on reading on this site it takes quite a bit of abuse to kill a 2JZ-GTE if it's properly maintained.

It's a 1JZ swap into my NA I'm tackling soon.

It'll be a fecking miracle if it EVER runs!

Are certain bov better at dealing with this than others then?

 

If so which one is the best?

There are blow off valves for higher hp applications designed to flow more and hold higher boost pressures, such as the HKS SSQV Racing, but even these cannot vent the air quick enough to prevent flutter when you lift off.

There are blow off valves for higher hp applications designed to flow more and hold higher boost pressures, such as the HKS SSQV Racing, but even these cannot vent the air quick enough to prevent flutter when you lift off.

Cheers for that. I guess its just something that you have to deal with then.

I get it a little bit myself with my current setup on BPU so would probably get bit a lot more on a single i guess.

Im running a Blitz bov at the moment IIRC.

I actually like the sound

I actually like the sound

Yeah its not too bad

Just wanted to find out if it is actually damaging to the turbos or not. From what i have just found out fitting a bov is better for the turbo than without one but doesnt get rid of the issue totally.

I think thats right

Yeh, getting rid of the excess air will always be better than letting it float about internally.

Good old turbo stall, listen to a wrc car and thats what your hearing, a build up of pressure which has no where to go .

I love that sound, heard it first when I went for a drive in a Nissan Sunny Pulsar GTiR!

That sounds deadly .

internet myth. its not going to damage your turbos dont worry

Flutter is the reason I want a TT/single, the other reason is the swoosh!

internet myth. its not going to damage your turbos dont worry

But if the air is being 'chopped-up' by the blades, then that means that the air is travelling the wrong way, right? So isn't that putting pressure on the blades? and not only pressure, but pressure the wrong way? So putting a load on them when they're spinning so fast will cause damge somewhere?

But if the air is being 'chopped-up' by the blades, then that means that the air is travelling the wrong way, right? So isn't that putting pressure on the blades? and not only pressure, but pressure the wrong way? So putting a load on them when they're spinning so fast will cause damge somewhere?

Internet myth becomes internet argument.

Old thread on the subject HERE

I don't run a dump valve on mine. I think the flutter sounds alot nicer imo. There have been threads about this before, I think Chris Wilson had his input in one of them. I think the overall view is that your turbo will break of something else before it dies of compressor stall.

Internet myth becomes internet argument.

I'm not arguing, I was just asking.

Ive never been a fan of BOV's. Yes they do sound good sometimes but other times it bring to much attention to the car.

To be honest i dont think there is any valve that can react quickly enough to relieve the system before compressor stall occurs anyway.