rotaryracer1

iTrader: (1)

Hello, i am replacing my turbo in my 88 t2 and was wondering what the " wastegate" looking thing is on my manifold, do i need this, the metal line that comes off it wasnt hooked up before. please help

NZConvertible

It's for the twin-scroll control system. The flap closes off one of the turbo's scrolls (the passages to the turbine wheel) at low rpm to increase gas velocity and hence spool the turbo faster (less lag). At 2700rpm it opens to allow both scrolls to flow.

With the hose disconnected the flap remains open. Assuming the solenoid is still in place on the vac rack and is functioning correctly, if you reconnect the actuator your turbo should spool up faster at low revs.

rotaryracer1

iTrader: (1)

does anyone know where it links to, i have no idea.

vicious525E

hmm, i was always under the impression that the twin scroll was a peace of **** and did more dammage then good, as is common with alot of the little things on the fc's

rotaryracer1

iTrader: (1)

so can i leave it disconected?

scathcart

You're wrong. Faster spool is always better.

scathcart

You can, but you would get low-end power if you reconnected it back to factory specs. You would gain nothing but simplicity from leaving it disconnected.

NZConvertible

Look in the FSM, page 4B-53.

You can leave it disconnected if you want, no harm is being done, but unless you've upgraded the turbo to something bigger you'll find the car drives nicer with it working.

Well that just shows how little you know doesn't it...

rotaryracer1

iTrader: (1)

thanks guys, where does it hook up to? i dont know

vicious525E

meh

NZConvertible

There should be a metal vac line coming down the back of the eninge from the vac rack. See the FSM page 4B-5.