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Originally posted by wayne hiscock
I Can have chatter or the woosh of a dv

i got woosh

will have chatter soon

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Originally posted by jr
bit boring but important as it stops all these people gettign excited over wastegate chatter

writtne by mike rainbird from passion ford btw

WASTEGATES DO NOT CHATTER, WASTEGATES DO NOT "DUMP THE BOOST" WHEN YOU LIFT OFF THE THROTTLE or any other noise that every journalist seems to accuse them of making!

For your information, wastegates dump EXCESS boost pressure in the same way as a pressure release valve on a pressure cooker, i.e. only when it gets to a point that is preprogrammed into the ECU as being too much (being controlled by a sprung loaded actuator and air being bled off / fed to this by an electromechanical solenoid, but that is a totally different kettle of tuna). So a wastegate only dumps boost in full throttle (or heavy load partial throttle) situations. The noise you are actually hearing in your closed throttle scenario (often described as a pigeon noise, or "whoofling" if heavily damped by a factory airbox), is in fact nothing more sinister than turbo stall (or it's correct term, compressor surge). This occurs when the throttle is shut and the air flow produced by the turbo hits the shut butterfly of the throttle body and has nowhere to go but back the way it came (the wrong way through the compressor housing), so the noise you get is the blades of the turbo "chopping" through the air that is bounced back off the closed throttle butterfly. Normally at this point (if fitted) you can hear a "tssssssshhhhh" noise as well, which is the "dump" valve releasing some of this air flow, in an attempt to stop the compressor stalling (and thus trying to reduce the lag when the throttle is reaplied and the turbo has to "spool" back up).

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Originally posted by kenzo

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Originally posted by Kerry
so to cut a long story short dump valves are bad and u are better with a recirc

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And how do u work this one out?

A recirc valve is the exact same as a dump valve. They both relieve the air pressure. The only diff is that the recirc vents the air back into the intake and a DV vents it into the atmosphere.

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Originally posted by j1400


hmmm 40mm external wastegate. Still waiting for the right engine to use it on.

External wastegates can't be illegal? on a few road cars.

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Originally posted by vibrio

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Originally posted by wayne hiscock
I Can have chatter or the woosh of a dv

i got woosh

will have chatter soon

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take the vac pipe off your DV and you'll have turbo stall

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Originally posted by stevenford_uk
atmospehric dump valves do a job, if its a good one they do it well, they reduce lag cos they gettin rid of the air that tries to stall the compressor, anti lag is cool. my dads mate had it on his evo 6, anti lag and launch control! the fun!
and i have been told by ian nixon at euro parts motorsport (twin engined renault 5gtt anyone) that turbo chatter does not damage your turbo, its jus a little laggy.
running 30+ psi with turbo stall sounds absolutly awesome! stupidly loud pitschhhh followed by lots and lots of very loud fluttering (i know cos my actuator pipe broke on my turbo mini, so i ragged it about for 2 days on 30+ psi (boost guage stopped reading at 30! went straight off)
that was fun, but bit laggy due to the 1.3l and T3 turbo

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Originally posted by Kerry
so to cut a long story short dump valves are bad and u are better with a recirc

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Originally posted by Kerry
i wont even give u the satifaction of rising to you

in my opinion you talk shit, as for your opinion on me i dont really give a fuck

but thanks for your concern anyway

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Utter crap! you've just proved to me, your little rant last night was posted from pure naivity and lack of knowledge, some dump valves don't work too well with certain engines as opposed to others is a more realistic statement.

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