wastgate
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wastgate
hi there need 2 know a question as above what is a wastgate and what job does it do i know its a silly question 2 ask also what is an acutor 2 and what does sorry 4 silly qustion can u tell me in very easy terms
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yeah wiv gases from the exhaust the spins the turbo its self and after that i am total lost wiv wastesgates and acturors i know know how a dump valve works thats just a spring does up and dwn when the turbo is on and off pressure
#7
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now; you've got to control the amount of boost, this is done by the waste gate and actuator.
the actuator basically controls the opening and closing of the wastegate by overcoming spring pressure
so if you're car/turbo is set 20psi peak, the wastegate will remain closed until 20psi is reached; then then spring will open the wastegate to allow exhaust gas to escape to stop more boost from being made.
does that make sense?
the actuator is calibrated or set electronically via a boost controller
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#8
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a dump valve is basically a way of venting built up pressure to the atmosphere
so; when your turbo is making boost you have pressurised air, now once you come off the throttle; the pressurised air needs somewhere to go.
if you dont have a dump valve the pressurised air can only come out of the turbo (which is why you get that lovely fluttering noise) this is better known as turbo stall, because essentially the air is stalling the turbo. However if you have a dump valve the presurissed air will come out through the dump valve which is why you get the ptshhhh noise.
This is why with a DV fitted the turbo doesnt have to spin up again which will in turn make the car feel faster between gear changes
Hope that helps; i'm crap at explaining things!
Matt
so; when your turbo is making boost you have pressurised air, now once you come off the throttle; the pressurised air needs somewhere to go.
if you dont have a dump valve the pressurised air can only come out of the turbo (which is why you get that lovely fluttering noise) this is better known as turbo stall, because essentially the air is stalling the turbo. However if you have a dump valve the presurissed air will come out through the dump valve which is why you get the ptshhhh noise.
This is why with a DV fitted the turbo doesnt have to spin up again which will in turn make the car feel faster between gear changes
Hope that helps; i'm crap at explaining things!
Matt
#10
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peak is the most amount of boost a turbo will make; usually a turbo will peak then tail off towards the top end of the rev range
a -31 actuator has a base lift pressure of 8psi
a -34 actuator has a base lift pressure of 14psi
cheers
a -31 actuator has a base lift pressure of 8psi
a -34 actuator has a base lift pressure of 14psi
cheers
Last edited by LHD220Turbo; 23-10-2009 at 08:07 PM.
#13
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If you have no DV the air stays in the system and as soon as you come back on throttle, the pressurised air is already there, so no lag.
Although this would depend on the psi and turbo i would imagine.
Last edited by st3v3; 23-10-2009 at 08:39 PM.
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