Customize your stock Holset Turbo
Registered User
Joined: Feb 2007
Posts: 1,958
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From: Dixon, IL
I should have said, "If you want one to just have one, either will "work". It will be bling and you can impress the local Hondas and JDM's."
Yes, 2 different things. I was wanting him to improve his knowledge so he can then help others, while knowing what each one does and which would be beneficial.
Registered User
Joined: Jan 2005
Posts: 3,899
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From: Yuba city Kalifornia
that was with a stock turbo ..before I up graded .and i guess I didnt need a blow off my head gasket took care of that for me.and with out a waste gate or blow off you have to turn down the fuel to keep from blowing a stock HG with stock head bolts and tq
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Joined: Oct 2008
Posts: 351
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From: Dallas, GA
Seems to be some confusion.
A Blow Off Valve sits on the intake side of the turbo. When it senses vacuum the internal piston/valve within the BOV is instantly opened the moment you let off the gas, allowing the charged air an ALTERNATE route to take instead of flowing backwards through the turbo. It can now vent to the atmosphere, which eliminates compressor surge and maintains spool up of the turbo during the shift (manual).
A Wastegate's ONLY function is the regulate the maximum boost pressure that the turbo will provide.
Similar to a BOV, the wastegate also has a piston/valve that is opened, however NOT by vacuum like the BOV, it is opened from the exact OPPOSITE - boost pressure. That's what makes them different from each other.
The wastegate has a spring inside of it (internal and external wastegate) that hold the piston/valve shut. The vacuum line attached to the side of a wastegate allows the boosted air to enter the lower chamber of the wastegate and when the boost pressure inside the wastegate OVERCOMES the spring holding the pison/valve closed, it cause it to open which allows the exhaust gases that normally flow through the turbo, to exit via the wastegate.
Because the exhaust gases now have an alternate route to take, the turbo can no longer continue to spool up and create higher boost pressures. Therefore it will maintain the same boost pressure that the spring is set at.
A Blow Off Valve sits on the intake side of the turbo. When it senses vacuum the internal piston/valve within the BOV is instantly opened the moment you let off the gas, allowing the charged air an ALTERNATE route to take instead of flowing backwards through the turbo. It can now vent to the atmosphere, which eliminates compressor surge and maintains spool up of the turbo during the shift (manual).
A Wastegate's ONLY function is the regulate the maximum boost pressure that the turbo will provide.
Similar to a BOV, the wastegate also has a piston/valve that is opened, however NOT by vacuum like the BOV, it is opened from the exact OPPOSITE - boost pressure. That's what makes them different from each other.
The wastegate has a spring inside of it (internal and external wastegate) that hold the piston/valve shut. The vacuum line attached to the side of a wastegate allows the boosted air to enter the lower chamber of the wastegate and when the boost pressure inside the wastegate OVERCOMES the spring holding the pison/valve closed, it cause it to open which allows the exhaust gases that normally flow through the turbo, to exit via the wastegate.
Because the exhaust gases now have an alternate route to take, the turbo can no longer continue to spool up and create higher boost pressures. Therefore it will maintain the same boost pressure that the spring is set at.
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Cummins600
3rd Gen Engine and Drivetrain -> 2003-2007
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Mar 30, 2004 01:21 PM
