Actuator Options
Turbo Mini Forums

Just wondered what actuators people are using for 20-25 psi boost.

We have the standard actuator for the Gt2056 which is probably only rated for 6-8 psi. The spec quotes "1.280 - 1.420 bar = 4.00 mm"

Obviously we can increase the pre-load and we will be using boost control via the ECU, but I'm concerned that the spring will not be man enough to hold the wastegate closed.

Any tips or recommendations?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

that should do .... itll be about 1,3 bar id expect ,so about 20 psi , then bleed it a bit for your boost level ?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Thanks Robert.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Waste... gate....?

So we can read this as being gauge pressure then:

"1.280 - 1.420 bar = 4.00 mm"

For some reason I was thinking absolute, but it would not be anyway. Another grey moment.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

No, because the actuator is a proportional modulating device, not an open/closed switch.

I think that the quoted pressure range is a tolerance and in gauge pressure.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

For example, the Gt17 actuator is quoted as:

"0.36Bar-0.40Bar = 0.38mm movement"

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Ah right so the stock setting on the GT20 is 18psi?

How do you intend to run lower boost?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I'm glad that this thread has popped up. I've been experiencing an odd boost issue at anything over 15psi. Instead of boost climbing smoothly, it fluctuates before contiuing to climb. I was wondering if either the actuator was struggling or my bracket was flexing at higher boost.

The actuator is set at the standard 5psi and I'm bleeding the rest off. I'll try a bit more preload and see if that helps.

In the 13's at last!.. Just

If you do not set enough preload, then the pressure in the turbine housing will force the wastegate open.

Let us know if the increased pre-load helps.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Pull the pipe off the actuator and you'll soon see how much boost it's capable of making on the standard actuator.

With proper boost control via a bleed device, I'd say you will be fine.

If you're just using a basic fixed bleed valve then it will not be fine.

But as others have said, if you fit a heavy w/g you wont be able to turn the boost down.

For progressive power delivery, map boost via TPS or rpm for a gradual increase. Should make traction easier and go easier on clutch/gearbox etc

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Pull the pipe off the actuator and block it, maybe, or wont you get uncontrolled boost if the actuator is just disconnected ?

Please tell me if I am wrong - I often am.

You're not wrong Dave.

We will see how we get on with minimal pre-load to start with. Might have to have another actuator on standby.

Boost will be controlled by the ECU and a solenoid valve, depending on gear and revs. We will also have traction control.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

http://www.dtsturbo.com.au/751578_dash_500...plied%29/pd.php

Says there its a 16psi actuator

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Gary...... NO!

No what?? lol

In the 13's at last!.. Just

we both know once that pipe comes off, theres no way it'll ever go back on LOL

I thought 2056 acutator was 15-16 psi like sprocket says. I have one on my 17 it did 12psi. Probably weakend over time

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

Don't worry, the pipe will stay on. Just going to wind the actuator in for a bit more preload...

For now at least....

In the 13's at last!.. Just

Mr. Prawn, the friendly Crustacean- slowly making steps towards forced induction.

Yep,

just thinking off the top of my head....

if the diaghram in the actuator is 1.25" diameter then the area is 5"

as force = pressure x area if we apply 10psi to the actuator we get 50 lb of force,

assuming Turbine inlet pressure (TIP) is three times boost pressure and that the wastgate valve is 3/4" diameter...

area of the wasgate valve is 1.75" so 30psi x 1.5" = 45psi.

asumming the leverage ratio of the wastgate lever is 1:1 (which it looks like from memory) thats getting pretty close even with my shady figures!


also its worth noting that on really high boost engines there can be an issue with manifold pressure pushing the valves open!!

it isnt pressure x area.

It's pressure x area^2 ( or square area whatever )

area = pi x radius^2

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will