wastegate spring pressure/ bov spring pressure
#1
wastegate spring pressure/ bov spring pressure
I was wondering the rule of thumb for wastegate spring rating vs desired boost level? I want to boost around 14psi, so should I use the 10-12psi spring? I will be using an electronic boost controller.
What about bov spring pressure? I don't want too much attention, so I was tightening it quite a bit, and I didn't hear any surge
What about bov spring pressure? I don't want too much attention, so I was tightening it quite a bit, and I didn't hear any surge
#2
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10-12 psi would be fine and you can control the rest with the boost controller. I'm not aware of any rule of thumb but to get the desired boost pressure you just run the same or lower pressure spring on the wastegate. You can control the wastegate duty and thus the boost spiking all with the boost controller.
For the BOV, that's usually based on the design. The one's that whistle like F &F are typically the ones that attract attention.
For the BOV, that's usually based on the design. The one's that whistle like F &F are typically the ones that attract attention.
#3
10-12 psi would be fine and you can control the rest with the boost controller. I'm not aware of any rule of thumb but to get the desired boost pressure you just run the same or lower pressure spring on the wastegate. You can control the wastegate duty and thus the boost spiking all with the boost controller.
For the BOV, that's usually based on the design. The one's that whistle like F &F are typically the ones that attract attention.
For the BOV, that's usually based on the design. The one's that whistle like F &F are typically the ones that attract attention.
I'm getting my car tuned soon and my wastegate is coming with a 14psi spring tension. I only want to hit 14psi max. I will have a boost controller anyways, so why would I need to buy a spring rated lower? Will I boost spike? I know lower is safer and better, I'm wondering if anyone had problems.
I guess my new question should be. I know a boost controller is always used to add boost, how about lowering boost?
#4
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the boost controller vents pressure between the turbo and the WG spring, so it can only raise boost, and not lower it.
you're also correct in the assumption that a 14lbs spring is sort of a ball park number, it will probably be accurate in that if you give the actuator 14psi, the wastegate will open, but due to the different manifold/turbine/compressor/engine combinations its hard to say what the boost will actually be.
the BMW 335's i think are setup backwards, the spring holds the wastegate open?
#5
Enthusiast
iTrader: (5)
I'm wondering how my boost would be if I set my controller lower than the rated spring pressure of the wastegate. I know the spring pressure is an estimate, and just a stiffness for a desired boost.
I'm getting my car tuned soon and my wastegate is coming with a 14psi spring tension. I only want to hit 14psi max. I will have a boost controller anyways, so why would I need to buy a spring rated lower? Will I boost spike? I know lower is safer and better, I'm wondering if anyone had problems.
I guess my new question should be. I know a boost controller is always used to add boost, how about lowering boost?
I'm getting my car tuned soon and my wastegate is coming with a 14psi spring tension. I only want to hit 14psi max. I will have a boost controller anyways, so why would I need to buy a spring rated lower? Will I boost spike? I know lower is safer and better, I'm wondering if anyone had problems.
I guess my new question should be. I know a boost controller is always used to add boost, how about lowering boost?
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#8
Just in time to die
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I say this with all the love possible to Ihor, I would never run a WG at twice the rated pressure. More often than not once you get too high over spring pressure you will start to see(graph) or hear oscillations. There has been more than one time on the dyno where we've heard the wah wah wah wah... Overall it is best to stay within 5psi or less of spring pressure for the typical build otherwise the spring can be too soft to hold.
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