invisiblebarriers (November 30, 1999 at 12:00 am)

errmm same thing, just depends on how you describe the noise, turbo stall, turbo surge, turbo chatter blah blah but it CANT be described as WASTEGATE CHATTER cause the wastegate plays no part in making that noise, looks like your the goon now mate!i've always run turbos without gay valves and they have never broke,only with a GT turbo i rub one coz those do break coz the shafts too thin

StockDC2 (November 30, 1999 at 12:00 am)

What are you goons talking about? Wastegate chatter? It's called compressor surge. You apparently don't know exactly what you are talking about either. Surge occurs because the BOV doesn't vent all of the air out of the piping, thus causing the air to circulate back into the turbo. This causes the turbo to spin the other way which yes, will kill turbos.

invisiblebarriers (November 30, 1999 at 12:00 am)

oh? where is it you've seen these cossies blow up from this excessive WASTEGATE CHATTER? if you knew anthing about cars you'd know that aint a wastegate chattering but the compressor wheel chopping up boosted air rushing back thru the wrong way!

antuk15 (November 30, 1999 at 12:00 am)

Oh dear, fit a dump valve. Ive seen cossie's blow a turbo from excessive wastegate chatter.

Tommymeboy69 (November 30, 1999 at 12:00 am)

it actually was a wastegate

yonumpty (November 30, 1999 at 12:00 am)

They are technically the same thing. Just stall is more commonly used when referring to turbines engines on planes etc. In a car it is more commonly referred to as compressor surge and is most notably associated with the flutter. Which many people mistake with the waste gate making the noise. Just different terminology for the same thing.

DeanBufton (November 30, 1999 at 12:00 am)

I would still have to disagree with you, i doubt that Cosworth would fit a recirculation system that was of no use in stopping the problem... I also think you're getting confused between "compressor surge" and "compressor stall", and their relationship.

yonumpty (November 30, 1999 at 12:00 am)

He may do that is still not wastegate chatter...wastegates can make a noise but not that noise it is different. That is compressor surge. As I said in a previous post there are huge articles about this and a lot of them explain the different. And the kinds of noises each makes. That is making the typical compressor surge noise. And I don't care if Cosworth designed the car with a recirc valve because virtually all modern turboed cars have them. They can still make that noise.

DeanBufton (November 30, 1999 at 12:00 am)

He does have a "blow off valve".

edwargo (November 30, 1999 at 12:00 am)

Actually it's just that he has no blow off valve, nothing at all to do with a wastegate. Close the throttle and boost pressure goes back through the compressor wheel and out the intake. It isn't compressor surge either, that's an entirely different beast - read your fluid dynamics text books! My car does exactly the same thing. If you believe it damages the turbo that's your business but there are just as many people who believe otherwise.