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Discussion Starter · #1 ·
HI,

What is wastegate chatter ? ...... I have heard it mentioned in past conversations but wasn't listening at the time !

What causes it ?

How do you cure it if you have it ?

What part is usually responsible ?

Thanks.....jonathan
 
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Discussion Starter · #2 ·
The MLR club magazine http://www.ltregister.f9.co.uk/graphics/happy1.gif border|EQU| 0 align|EQU| absmiddle >

Sorry , that was too tempting.

Don't worry it's not a fault.

The wastegate is a valve in the exhaust housing of the turbo which controls the boost pressure. When the boost reaches the pressure set for the engine an actuator controlled by a solenoid linked to engine vacuum , opens the wastgate which bypasses some of the exhaust gas fed to the turbo by the exhaust manifold , the turbo slows down and boost pressure does not rise until the wastegate closes.
Wastegate chatter is the noise made by fast response external competition wastegates fitted to high output engines , typically in race and rally cars. They can be used in the more ambitious road cars though.
 
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Discussion Starter · #3 ·
That is 'ONE' sound that I would love to have on my E6 http://www.ltregister.f9.co.uk/graphics/biggrin1.gif border|EQU| 0 align|EQU| absmiddle >

What do I do next ? [img]http://www.ltregister.f9.co.uk/graphics/tonguewink1.gif border|EQU| 0 align|EQU| absmiddle >
 
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Discussion Starter · #5 ·
Peely,
Remove the Blow Off Valve and you will get the noise when you lift. My 6 came with the BOV 'removed' and I got a noise at lift-off which I associate with the wastegate. Ive put a BOV back in the system and dont care for the noise I now get. I'll be reverting to the original set up when I have the time.
 
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Discussion Starter · #6 ·
Howardb, sounds easy enough, but is it safe to run without the BOV ?

What happens to the pressure if there is no valve to go through ?

Anorak ready.
 
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Discussion Starter · #7 ·
Howard,

I think the noise you'll be hearing is associated with the turbo stalling - this is not a good thing http://www.ltregister.f9.co.uk/graphics/sad1.gif border|EQU| 0 align|EQU| absmiddle >.

Years ago a friend of mine had a R5 Turbo which came without a recirc valve. When he fitted an aftermaket filter, you could hear the turbo every time he changed gear. It sounded similar to the chatter the rally cars make but it was the turbo stalling. You could distinctively here the turbo stuttering to a halt. As soon as he fitted a BOV, the stalling went, being replaced with a nice Psssssht [img]http://www.ltregister.f9.co.uk/graphics/happy1.gif border|EQU| 0 align|EQU| absmiddle >. Unfortunately, he went through two turbo's before the BOV was fitted.

I'd replace the Recirc valve before you [email protected] the turbo up - if you're running high boost, the compressor can actually shatter (rare, but not worth taking the risk), getting ingested by the engine!!
 
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Discussion Starter · #8 ·
Mark,
I see where you're coming from. I've had a lot of discussions over the use of a BOV on my engine. BTR Preparations have commented on it and I also note that Julian Edgar in his 21st Century Performance book actually questions the use of BOV's. I also believe that Cossies dont run BOV's, or at least not the high power ones. At the end of the day its how the car was sold to me, so if the turbo fails it should be a warranty issue! The car certainly felt much quicker through the gears. I'm actually going to try using the Seconmdary Air Supply valve as a dump valve this weekend, as this is originally where my BOV was venting to, not that the SAS valve is operative often - well mine wasnt when i monitored it.

Peely, all I can suggest is that you try it. You might get away with just removing the vacuum feed to the BOV, though the boost pressure might start to open it, just reverse it if that happens. One day of careful driving isnt going to hurt the engine and if you arent happy with the results go back to original. If you do remove the vacuum line to the BOV remember to block it up or the engine will try to breath through it.
 

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Evo4Jon said:
HI,

What is wastegate chatter ? ...... I have heard it mentioned in past conversations but wasn't listening at the time !

What causes it ?

How do you cure it if you have it ?

What part is usually responsible ?

Thanks.....jonathan
its our magazine u plank ;) :D

go blow yer valves somewhere else :moon: :crackup:
 
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