Whats Is This Thing?

[Buddy]

hey guys, i have a big boost problem with my R33 gtst, just have mad missfiring when boosting and i have noticed this..

i dont no what it is but is there a hose missing or is it normal, i have an intercooler n blow off aswell

Edited April 23, 2009 by Buddy

[gotRICE?]

That is an Actuator, the rod is connected to the wastegate, and it opens when it reaches the boost its set to, via an internal spring/diapragm.

Im no expert with aftermarket ones, but i would say theres sposed to be something hooked up to it? What boost does it make?

The missfire could be you boosting 400000psi

[HEKT1K]

that's your wastegate actuator mate.. pretty sure you need a vac hose from somewhere in your cooler piping (a pressure source) to that nipple.. unless you want infinity psi of boost

[HEKT1K]

gah you beat me to it gotrice!

Buddy - do not drive the car in this state, unless you want your turbo to go bang

[femno]

What are you on about?

Looks right to me. Connected to the top port. Havent ever seen a dual ported internal actuator but it looks like it should be connected that way, by way of daiphram functions. It pushes to open the gate flap.

Second (lower) port could be to add more boost, similar to the way an external gate works. Dont worry about it though.

What is your boost set at? Boost controller? ECU? Not much looks standard there...changed plugs lately? Tried changing coilpacks?

[Buddy]

i dont no what boost it gets to cause it just seems to miss when its flat just after 4000rpm, iv seen it at 10psi b4 around 6000rpm but i dont have a boost controller or anything so i dont no why its boosting past stock??

i dont no what im talking about thats y i posted,

i have them idridum plugs in bout 5000ks ago, n i have standand coil pack?

why would it boost past stock boost if its all normal with no controller??

Edited April 23, 2009 by Buddy

[PM-R33]

Wow a dual port internal gate, that's different

[SDEWY5]

ur turbo is new and same wit wastegate, put money on it ur not running standard 7psi. Do you have any form of aftermarket management on this car?

[blind_elk]

Where is the other end of the hose connected?

And that arm is adjustable - could be producing too much boost for the ECU to handle.

[mico]

are u sure the top port is supposed 2 be used ? on external gates its side port only, top for a boost controller. the diaphram cant release otherwise.

[VB-]

as long as it has one hose to the top of the actuautor you'll be fine. got a bit more of a description of the exact problem? sounds like it could be dying coil packs....

[RBceffy25]

I have a HKS EVC II boost controller and when i bought it no one I know knew how to hook it up so I jumped on the net and found a PDF for the manual. The only problem was that the installation instructions were for either external gate or dual-port internal gate. From memory the lower port should go to an un-interrupted intake pressure source such as somewhere on the intake plenum.

Don’t quote me on this cause I’m not sure how correct this is. Maybe someone can verify this?

[Pal]

nah, should be on top. the actuator pushes the wastegate open and the hose is positive pressure so air needs to pressurize the top half of the actuator!

[mico]

^^ full credit, im not familiar with these dual ports.

[FATGTS-R]

Not sure about the GTR's but the gibson R31 GTSR's ran a dual port actuator.

I asked the owner of one at phillip island why it was like that and all I got was "better boost control". I didnt want to look like a dick and sticky beak all over the thing so I didnt see where either hose was going.

Edit~~ Found this from a google search.

A dual port wastegate adds a second port on the opposite side of the actuator. Air pressure allowed to enter this second port aids the spring to push harder in the direction of closing the wastegate. This is exactly the opposite of the first port. The ability to help the wastegate remain closed as boost pressure builds can be increased. This also adds further complexity to boost control, requiring more control ports on the solenoid or possibly a complete second boost control system with its own separate solenoid. Use of the second port is not necessary. Secondary ports, unlike primary ports, cannot be simply attached to a boost control line and require electronic control to be useful. C02 can also be used to apply pressure to the second port, in order to control boost on a much finer level.

[Buddy]

ur turbo is new and same wit wastegate, put money on it ur not running standard 7psi. Do you have any form of aftermarket management on this car?

i have boost gauge which says 7??

and no aftermarket management

[Buddy]

Where is the other end of the hose connected?

And that arm is adjustable - could be producing too much boost for the ECU to handle.

the top hose is connected to my intercooler pipe?

is this rite?

[Buddy]

as long as it has one hose to the top of the actuautor you'll be fine. got a bit more of a description of the exact problem? sounds like it could be dying coil packs....

well it just missfires heaps when the throttle is flat from start of boost till around 6000rpm and iv seen the boost around 10 but cant keep it there cause of the missfire, but if i press the throttle about half than it doesnt miss but boosts around 5psi, i have no boost controler and im sure its all standand just with intercooler n BOV??

[VB-]

is it a really rapid, machine gun sort of missfire? or does it just randomly pop/cough/fart a bit?

[MBS206]

Coil packs/plugs...

You're all too worried aobut the actuator to see the guy has classic coil pack break down...