wastegate hole size
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Evolving Member
Joined: Feb 2004
Posts: 152
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wastegate hole size
i've herd people say...
spoolup is affected by wastegate hole size.
why would the wastegate hole size affect spoolup???
if the wasegate is completely closed durring spoolup
and open durring a set manifold pressure (to relieve gas/pressure/decrease or maintain boost)
why would having a hole thats too small affect spoolup??
i could see how having a hole thats too small and not allowing enough gass to pass through/still creating thrust(i.e. boost creeps/manifold pressure still increases)
but...not spoolup
am i correct in this assumption?
also...
if i have an adjustable wastegate
as boost increase.... the wastegate rod will push further out and uniformly/steadily open the wastegate...as boost increases
if this is the case
an ideal situation where the wastegate is completely closed durring spoolup cannot be achieved
hence the need for an electronic boost controller or wastegate silenoid
i.e. to open the wastegate (all at one time, not incramentially) after spoolup to alleviate excess manifold pressur
spoolup is affected by wastegate hole size.
why would the wastegate hole size affect spoolup???
if the wasegate is completely closed durring spoolup
and open durring a set manifold pressure (to relieve gas/pressure/decrease or maintain boost)
why would having a hole thats too small affect spoolup??
i could see how having a hole thats too small and not allowing enough gass to pass through/still creating thrust(i.e. boost creeps/manifold pressure still increases)
but...not spoolup
am i correct in this assumption?
also...
if i have an adjustable wastegate
as boost increase.... the wastegate rod will push further out and uniformly/steadily open the wastegate...as boost increases
if this is the case
an ideal situation where the wastegate is completely closed durring spoolup cannot be achieved
hence the need for an electronic boost controller or wastegate silenoid
i.e. to open the wastegate (all at one time, not incramentially) after spoolup to alleviate excess manifold pressur
Your thoughts are correct. WG size has nothing to do with spool up.
A ball and spring style manual boost controler also alows none of the boost pressure to reach the WG actuator until the set boost pressure is reached just like the electronic boost controlers you are talking about, and give you great spool up. A bleeder style MBC acts just like stock with the wastegate rod being pushed further out as boost pressure increases, and is horible for spool up.
Keith
A ball and spring style manual boost controler also alows none of the boost pressure to reach the WG actuator until the set boost pressure is reached just like the electronic boost controlers you are talking about, and give you great spool up. A bleeder style MBC acts just like stock with the wastegate rod being pushed further out as boost pressure increases, and is horible for spool up.
Keith
