noob boost question..

**stndrd** · 04-12-2011 10:33 PM

Originally Posted by mugen_ctr

A standard internal gated turbo doesnt have a spring but a diaphragm, a spring is what they use on many external type waste gate

What do you think moves the diaphragm then? All wastegates have springs, just the internally gated set ups have the rod attached to the diaphragm & spring to open up a flap in the rear housing to allow excess air flow through

**mugen_ctr** · 05-12-2011 12:10 AM

Originally Posted by stndrd

What do you think moves the diaphragm then? All wastegates have springs, just the internally gated set ups have the rod attached to the diaphragm & spring to open up a flap in the rear housing to allow excess air flow through

ah my bad, an yes, that is true.

And on that note, this does explain why u need a boost controller, as it allows/limits the amount of pressure that enters the actuator thus allowing the flap to open/close at certain pressure....

One common problem with internal gated ive ran across was boost spiking, though running a EBC does help alot, for those who run a manual bleed valve its not a pretty sight!

**IV73CI** · 05-12-2011 07:25 AM

Simple answer NO.

if your using a standard turbo with an internal wastegate/actuator = NO.
If your internal wastegate/actuator has an adjustable ROD = YES
If external wastegate/spring = YES
If boost controller = YES
IF during a dyno tune = NO (yet again - define what dyno tune really involves?)
IF your running an after marker ECU with boost controller option = YES

People are saying by playing around/tampering with your internal actuator adjusts boost then they are wrong!

You cannot tamper with your internal actuator as they are Diaphragm/spring loaded, and if u dent the actuator housing, this will cause the Diaphragm/spring to malfunction.

Best thing is buy a boost controller or buy the optional boost controller/module for an aftermarket ECU.

just to answer the theory below;

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Originally Posted by mugen_ctr

A standard internal gated turbo doesnt have a spring but a diaphragm, a spring is what they use on many external type waste gate

What moves the Diaphragm/spring in and out is the amount of forced controlled pressure vs vacume pressure within the turbo setup.

There is a spring in the internal actuator which is under the diaphragm - this is controlled by the pressure within the engines gases. i.e Vacume, Exhaust etc,

External Wastegates = are spring loaded and do not have diaphragms. - Boost is controlled by the spring density rating.

Put your pedal down = builds up pressure by the turbo spooling (actuator closed), once released the vacume acts and opens up the actuator which then releases the excess exhaust gasses into your dump pipe.

Here is a great write up all about turbo setups.

http://www.beesandgoats.com/boostfaq/g2icturbo.html