Am i stupid?

[richybigman]

Hi all,
At the weekend i decided to take my 007p valve off completely and capped off the pipes. The sound it creates is quality which is caused by wastegate chatter.
Question is as the title suggests 'am i stupid?' for doing this and should i put the 007p back on?

Thanks
Rich

 

[G2232]

Yes cos that chatter is the turbo stalling basically

 

[richybigman]

Surely it's just the wastegate letting the air out and not the turbo stalling

 

[G2232]

well if you have removed the dv and capped it off then the back pressure has no where to go there for resulting in the turbo slowing quicker than its really ment to or wanted

im no expert but thats my opinion

 

[DPJ]

How about the air pressure backing up against your turbo compressor wheel, with the blades chopping against the air, causing themselves potential damage?

 

[andycupra]

yes you are stupid.

the dv is there for a reason, as set out above.

 

[Romeoisgraham]

How about the air pressure backing up against your turbo compressor wheel, with the blades chopping against the air, causing themselves potential damage?

This guy is right.


and yes your stupid.................would you take your brake calipers off to reduce weight?

 

[richybigman]

This guy is right.


and yes your stupid.................would you take your brake calipers off to reduce weight?

Ok...... bit of an over exaggeration there me thinks.

I was just wondering as some of the jap tuning company's say it's ok to run no valve on jap cars and i assumed all turbo's worked pretty much the same.

 

[G2232]

well yeah the seat cupra cup cars dont run dvs but they might be able to afford to burn out turbos every race.

as for the japs they may well use something in place of this i dont know the ins and outs

 

[Ruddmeister]

Ok...... bit of an over exaggeration there me thinks.

I was just wondering as some of the jap tuning company's say it's ok to run no valve on jap cars and i assumed all turbo's worked pretty much the same.

I run no DV on my diesel, it works a treat

 

[skahigh]

Funny this should come up, I was reading an article yesterday in 'Redline' magazine about tuning myths. Apparently, there is no such thing as 'wastegate chatter', the noise is made by something else, I cant remember exactly what but i'll have a look and post it up when i get home.

 

[777cupra]

I personally wouldn't be a fan of doing it.

One thing I've noticed is no-one has asked if it's actually made any difference in perfomance, either for the better or worse?

If all it has done is make a noise then probably better to keep the dump valve on.

It's kind of like when your exhaust falls off, the car sounds all deep and nice like a rally car but in actual fact has got "issues"! ha ha!

 

[skahigh]

here we go, from redline magazine entitled "wastegates make a 'chatter' noise"...

We'd like to make this very clear: wastegates don't make any kind of chattering noise, ever.

We've got no idea how this one started, but we remember hearing it on episodes of Top Gear in the early 80's. Comments like "You can hear the wastegates chatter as they dump boost" have been repeated ever since.

The noise actually comes from pressurised air exiting the turbo inlet. The only noise wastegates can make is a loud exhaust noise if they're vented to atmosphere through an unsilenced screamer pipe.

 

[Cupraloon]

I used to have a system2, 2 litre RST running 250bhp at about 1.3 bar without a dv, never had any issues with that, and power engineering who did the conversion said one wasn't really nessasary, but.....

I'm of the opinion that if vw/seat who have all those million pound resorces at there finger tips have fitted one it must be there for a reason, so i don't think it's advisable to remove tbh, but i'm not an expert ...

Just a final thought arn't dv's there to vent excessive pressure to stop the turbo from slowing or stalling on boost thus preventing damage to the turbo.....

 

[skahigh]

ha, 10mm away from the previous quote in redline, the following myth is also revealed....

All turbos will fail rapidly if you don't run a dump valve.

The theory behind this is sound, because the pressurised air trying to escape out the turbo inlet as you shut the throttle on a car with no dump valve rapidly slows the turbo, which in theory could damage it. The reality, however, is that the engine or turbo usually fails from a different problem first.

Certain turbos are stronger than others, and considering the price of dump valves one popular opinion is that you should run one anyhow just in case, especially on big, high boost turbos.

At the other end of the scale are tuning experts who advise against running one at all, on the grounds that if it leaks slightly you can lose performance and damage the turbo. Frankly, the choice is yours.

If it was me, as loon says, Seat put one there for a reason...I wouldn't remove it.

 

[richybigman]

Well i put the 007p back on when i got home from work. It did sound good though

 

[beezasport]

I think jap cars use roller bearing turbos...i've been told they can get away with this, i'm no mechanic though

 

[push110]

I think the main confusion is the wastegate chatter name as it has nothing to do with the wastegate

A wastegate vents exhaust pressure once the turbo is producing a set amount of boost, in order to limit the boost pressure produced (by limiting the energy imparted to the turbo turbine blades)..

A dump valve vents excess intake boost pressure when the throttle is shut, which means there (shouldn't) be an instantaneous 'stalling' of the turbo compressor (and therefore turbine) which puts stresses on the rotating parts, and leads to a bit of lag when you open the throttle again and ask the turbo to start spinning once more

Thats my understanding of it any way

 

[Rick 01]

Yeah, surely 'lag' will increase without the DV?

That's never a good thing.

 

[65coupe]

This guy is right.


and yes your stupid.................would you take your brake calipers off to reduce weight?

I'm taking my brake calipers off tomorrow - without brakes my car should be much faster!!