I Need a quick lesson on the Z32tt

[Porschetech38]

I need someone to help me better understand how the wastegate accuators work on the vg30dett. Are the accuators controlled electronically by a stock electronic boost controller or by other means??? Im new to boost but im trying to catch on lol any help would be greatly appritiated. thanks for your time guys

[Ace2cool]

I need someone to help me better understand how the wastegate accuators work on the vg30dett. Are the accuators controlled electronically by a stock electronic boost controller or by other means??? Im new to boost but im trying to catch on lol any help would be greatly appritiated. thanks for your time guys

No electronics involved, completely mechanical. Entirely controlled by the spring rate in the wastegate. When the pressure at the wastegate reaches "x" amount of pressure, determined by the amount of boost being generated, the spring in the wastegate opens and keeps the system from "overboosting".

[Porschetech38]

so an electronic boost controller would be pointless without changing the springs in the wastegates???? I really want to make these turbos to make some more boost...

[DanDrath]

no an ebc will help you. What it does is closes off the vacuum going to the wastegate making the wastegate need more pressure to open up. Letting you run higher boost

[Porschetech38]

I thought boost pressure accuated the wastegates, if im wrong where the hell are the wastegates getting vacuum when the turbos are creating boost. Im new to boost likw i said.

[Ba11erz]

I thought boost pressure accuated the wastegates, if im wrong where the hell are the wastegates getting vacuum when the turbos are creating boost. Im new to boost likw i said.

Ace2Cool and DanDrath are on it!

I added these links to provide some more clarity.

In short-

The main function of a wastegate is to allow some of the exhaust to bypass the turbine when the set intake pressure is achieved. (source: http://bit.ly/aX9tPH)

Boost controllers often use pulse width modulation (PWM) techniques to bleed off boost pressure on its way to the reference port on the wastegate actuator diaphragm in order to (on occasion ) under report boost pressure in such a way that the wastegate permits a turbocharger to build more boost pressure in the intake than it normally could. In effect, a boost-control solenoid valve lies to the wastegate under ECU (engine control unit) control. The boost control solenoid contains a needle valve that can open and close very fast. By varying the digital control frequency to the solenoid, the solenoid valve can be commanded to be open a certain percentage of the time. This effectively alters the flow rate of air pressure through the valve, changing the rate at which air bleeds out of the T in the manifoldpressure reference line to the wastegate. This effectively changes the air pressure as seen by the wastegate actuator diaphragm. (source: http://bit.ly/9fQY1X)

Also, I took the plunge and purchased from Amazon "How to Tune and Modify Engine Management Systems" (ISBN: 13: 978-0-7603-1582-8) It has a few gems in there regarding manifold tuning among other things if you're interested in reading up on engine and ems tuning.

Good luck and I hope this helps.

[evildky]

boost pressure does activate the wastegate actuators, but in the Z32 the actuators are set to 7 psi or there abouts, the line that feeds them first goes through a soleniod valve that bleeds oressure off, and when saftey boost is activated the solenoid closes or opens (sorry It's been a while and I can't rmemebers fir sure if it was normal open or normal close) and the actuators see the actual pressure and open at 7, when saftey boost is nto activates the valves bleed pressure off so the actuators don't open until 10 psi

an ebc, is an inline valve that goes in that same line and opens at a predetermined pressure

[Komodo]

in some what keeping with the theme of this post, does anyone have a link that talks about the Z's VG30DETT engine? I know how engines and turbos work but not the setup Nissan used on these engines.

Thanks!!