Dump valve, blow off valve, call it whatever you want. Once boost reaches a certain pressure it diverts any extra, unwanted boost, usually back into the intake, pre-turbo.
By moving air I meant the volume of exhaust gas it allows through it. A 1.58 A/R housing allows significantly more exhaust to flow through it than a 1.15 A/R housing but the 1.58 takes longer to spool up. The 1.15 spools up faster but can't let the volume through it that a 1.58 can which causes a high drive pressure ratio. The fix is to put a small housing with a wastegate. You get the spool up of the 1.15 and the ability to move the volume of exhaust that the 1.58 housing has.
They don't limit boost or power. They lower drive pressure to help maintain a 1:1 boost/drive pressure ratio.
Detroit 60 series RPM range
Discussion in 'Trucks [ Eighteen Wheelers ]' started by marineman227, Feb 10, 2015.
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midcon, Blowcanner1975 and spsauerland Thank this.
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Guf Thanks this.
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Wastegates don't control boost pressure; they control drive pressure.Blowcanner1975 and spsauerland Thank this. -
A blow off valve and a wastegate are two completely different concepts.
A wastegate WILL and does control boost if properly developed. They are not a one size fits all concept.
To me a wastegate includes the hole in the housing not just the actuator. -
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I think everyone is confused a bit.
There are 2 types wastegates. Internal type that is inside the turbine housing on the drive pressure side .And external type that is down stream on the boost side.
Benjamin is correct to a point that the turbine wastegate limits drive pressure and that its main purpose is to stop over speed of the compressor . Does it limit boost ? Yes but not as much as a external wastegate. The external gates main purpose is to stop compressor surge or chuff when letting off the throttle fast between shifts. The computer controlled external wastegate now a days will also control boost pressures but this is more common on gassers.
Hope this help clear up the confusionLast edited: Oct 10, 2019
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My truck isn't overspooling...You just can't build an 1800hp Series 60 with 30lbs of boost. If you were paying attention you would understand why I have a wastegate. It's to get the quick spool of the 1.15 housing and the high flow of a larger housing. If I took the wastegate off, my drive pressure, which right now never exceeds a 1:1 ratio, would increase above my boost pressure with would limit how much boost I can make and lower overall horsepower. -
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benjamin260_6 said: ↑If I took the wastegate off, my drive pressure, which right now never exceeds a 1:1 ratio, would increase above my boost pressure with would limit how much boost I can make and lower overall horsepower.Click to expand...
It would seem that a wasegate controls drive pressure which limits boost by bleeding off exhaust energy
A pop off valve limits intake pressure [boost] by bleeding off excess back pressure. -
How It Works: Wastegates Explained
Some good info to whoever is confusedLast edited: Feb 6, 2020
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