Wastegate Actuator

[mid life crisis]

just a quick question r33 stock turbo ok what would happen if i ran a hose from the pressure side of my intercooler ie oulet side of turbo straight to the actuator bypassing the boost solinoid .would it just boost to what ever the spring in the actuactor is set at whatever that may be or would it over boost

cheers

[Beer Baron]

it will just boost to whatever the wastegate actuator spring will hold.

[mid life crisis]

cheers for that . thats about what i fig as well ok will give it a go see what happens

[MBS206]

If it's on a stock car, you will only hit 3PSi.

[mid life crisis]

im sure the spring is stronger than 3 pound in the actuator otherwise how could it hit 7 in the high boost mode?

[The Mafia]

the boost solinoid actually bleeds off air pressure so that the wastegate is harder to open and requires more pressure.

[GunMetalR33]

on a stock r33 GTST I think the actuator is a 5 psi spring or close to. By doing this you will get less boost.

[Guest 40th-edition]

the turbo diesel all run that set up out of intrest... well the ones i work on do!

[BAMR33]

on a stock r33 GTST I think the actuator is a 5 psi spring or close to. By doing this you will get less boost.

Not true, think about what you have said....

My solenoid is disconnected as it was playing up and bleeding off 4psi, once unplugged boost retuned to 7psi with some spiking as expected.

This guy is correct

vvvvvvvvvvvvvv

the boost solinoid actually bleeds off air pressure so that the wastegate is harder to open and requires more pressure.

[GunMetalR33]

Not true, think about what you have said....

OK Mate,

Let me clear this up. When the bleed actuator is connected and working it bleeds air out of the hose between the intake piping and the waste gate actuator.

Lets say that the waste gate actuator spring is rated at 5psi therefore limiting the boost to 5psi as the waste gate opens. Now lets assume that the bleed value is set to bleed 3psi... This means that the intake will have to be pressured to about 8psi (5psi for the spring rate + 3psi worth of bleeding) to make the waste gate actuator spring open and limit the boost.

Therefore by removing the 3psi bleed you effective reduce the amount of intake piping pressure needed to open the waste gate which means offcourse less boost in the intake manifold...