Ive removed the twin scroll setup from my TII with the exception of the flapper inside the exhaust manifold.

Obviously the flapper needs to stay open, so I was just going to wire it open, but then I started thinking, if I dont wire it open and just let it move freely, wouldnt the exhaust gas hold it open at all times?

 

not necessairily.....if its removed you should wire it open

But why would you remove it?? Felt like adding a little lag to your setup?

 

i removed it, felt no real diffrence with a free flowing exhaust, i can get into boost at 3k rpms in 3rd

 

my motor is streetpored, with a full exhaust. I dont think the twin scroll would have helped anything in my case.

But I guess I'll wire it open then.

 

take it out, weld the hole shut, or put a bolt in its place.

 

It's far more llikely it will hold it closed under load. Definitely wire it open or leave the actuator in place to hold it open.

Neither of those things would make the twin-scroll system less beneficial.

Did you confirm the system was actually working before you removed it? Any problem with it (like a cracked vac line) will make the flap stay open, so there will obviously be no difference upon removal.

 

http://fc3spro.com/TECH/HOWTO/EGT/egt.html


-Ted

 

wait does the actuator for the twin scroll hold it OPEN or CLOSED with no vacuum source attached to it?

 

i speak from experience do NOT let the flapper flap freely IT WILL block your exhaust stream. take the flap out if you dont have a stock turbo. and you will notice a difference if the flap is taken out.. i know i did. i took mine out by breaking the weld on the pivot from the outside. and twice the out arm off. tap it and be merry

 

i speak from experience do NOT let the flapper flap freely IT WILL block your exhaust stream. take the flap out if you dont have a stock turbo. and you will notice a difference if the flap is taken out.. i know i did. i took mine out by breaking the weld on the pivot from the outside. and twist the out arm off. tap it and be merry

 

Why remove the twin scroll? Im just trying to learn more.

 

If you had just removed the vacuum hose from the solenoid or actuator.........the flap would have stayed wide open all day and night long. The actuator spring loads it to full open when there is no vacuum available.

 

The spring in the actuator holds the flap open. Below 2700rpm (and as soon as you start the engine) the ECU turns the solenoid on which applies vacuum to the actuator, which pulls the flap closed. A check valve holds the vacuum in the actuator even if you open the throttle. When the engine goes above 2700rpm the ECU turns off the solenoid which releases the vacuum to atmosphere (or more correctly lets air in) and the flap springs open. When the engine speeds drops again the process repeats.

 

Less turbulence in the turbo exhaust manifold...
Even with the flapper in the "open" position, there is still partial blockage.


-Ted