Vacuum to turbo. Waste gate?

[abscate]

Thanks absate.

I need a kids hand to work on this! I may lower the front of sud frame for easier access back there.
Thanks again

Its even harder when you are left handed.

[mrjay62]

And that I AM! left handed! With nerve damage from my neck down to my right hand.... 15,20mins and I cant hold a tool in my right hand.
Is what it is... ill get this figured out...

Thanks.

[abscate]

Its creepy what algorithms can figure out on the internet...

[mrjay62]

lol. Ok....

I can Only get to 2 of the 3 bolts on the CBV. Not even a thin 10mm flat square wrench from a motorcycle tool kit has room.
I guess im suppose to remove the turbo for this?

[abscate]

Its a real b*** in heat, I agree. Do you have a ratcheting box end 10mm? I think that worked on mine.

I am having a vague ugly flashback that I might have turned one off with an open end, having to flip and rotate every 1/16 turn or something ugly like that.

[mrjay62]

Hi...
Yes I Do you have a ratcheting box end 10mm 3 different makes the thinnest is a Husky set but I can not land it on the bolt head. I can just about get a box wrench but no room to get any kind of turn on it..... The car is now in full sun im going to leave it alone for a while.....
When I cool off maybe ill see things differently. lol
Ill update as soon as I figure out what to do next.... maybe try to remove the complete turbo and hope for the best...

[SuperHerman]

Different car but maybe what I did on my XC90 T6 could help. To get to my bolts I loosened the inlet pipe and moved it aside and then coming in from the side (airbox removed) with a long 1/4 extension and 10mm swivel I was able to attack the bolt. Again not sure if it will work in your car but something similar may - at least get you thinking of options.

[abscate]

Removing or loosening the water pipe looks a lot easier than turbo removal. You just need a single place you can move the tool

[mrjay62]

I think your right abscate...
Got the car on the garage its off ground about a foot tomorrow im just going to loosen the sub frame mounts and lower the front of the sub frame.
I just Can Not work in that tight space. Cant see what im doing or flex my neck to look down there...
Ill update when I make progress.

Thanks guys...

[jimmy57]

A little note here. The TCV control is a pulsed signal that changes the pressure to wastegate. The spring in the wastegate actuator is there to hold wastegate valve closed with the pressure from hose applying the force on diaphragm to push wastegate open to variable opening. On systems with TCV the wastegate opening pressure is set to a low pressure setting. This low setting is the safe torque setting used for a list of problems (including broken valve or disconnected wire) and also for winter mode on models with that switch. With low boost wastegate setting the TCV now becomes a variable leak to reduce the pressure from turbo outlet boost level to something less than wastegate opening pressure for RPM ranges where torque output is going to be low without higher boost. In middle RPM range the engine torque is higher and boost needs to be reduced or a much higher torque will be produced, in narrow RPM range high peaks usually. At higher RPM where torque will fall off the TCV signal is increased in percentage to create more leak and thus less wastegate opening pressure and boost goes up to prop up torque. Front wheel drive vehicles can be more tricky to control with sudden high torque peaks. Tire wear is much worse from too easy break loose tire on inside of turns in normal city driving. The third hose to inlet pipe from MAF to turbo is the bleed air (leaked air). That has been metered by MAF already and dumping it there makes it not affect fuel mixture control by truly being a leak.
The bypass valve on models with that are fitted with that device and it is not an electric version, use vacuum to open momentarily on lift throttle. That valve has a diaphragm and uses a small bleed orifice (leak). When you are under higher boost and throttle closes suddenly the vacuum goes to a high level quickly and lifts the valve off seat and output of turbo is connected to inlet of compressor wheel. This dumps the pressure surge that occurs from suddenly closed throttle. The surge is not healthy for turbo, slows turbo down hurting throttle re-apply response, and can go back past MAF sensor and give a high flow signal that could make fuel mixture rich momentarily.

To complete the info I will add that some wastegate systems are vacuum and the wastegate is adjusted by a pulsed TCV controlling vacuum to the wastegate. These use the manifold pressure sensor as monitor for pressure to drive signal change. Why would they use vacuum? The wastegate is opened for cold start no load to allow faster catalyst heating. Exhaust heat falls with contact with exhaust turbine. The new 2.0 litre 4 cylinder engines can use this feature.