Boost Controller and the TCV?
 

I hooked up my boost controller and gauge. THey are doing their job. But boosting can sometimes be sporadic. Plus I never get any negative vacuum to the gauge. Only thing that could possibly be causing the no vacuum could be the TCV. Anyone know exactly what this does and how it works.

RE: Boost Controller and the TCV?
 

btw TCV = Temp Control Valve

RE: Boost Controller and the TCV?
 

I will go ahead and answer my own question for all who reads. The TCV (Temp Control Valve, aka Turbo Control Valve, aka Turbo Control Solenoid) is located in the line going to the waste gates. It regulates air and wut not. Anyway... it seems that it is best to unhook it and bypass it if you hook up a MBC. It will make boosting smoother. When upping the boost, the air pressure is out of its range to handle and it sort of freaks out. Someone on one of these forums said they were getting a noise in their cabin on the left hand side when they hooked up their MBC. It was because they didnt bypass the TCV and the relay that controls it is under the dash to the left, it will click rapidly causing a light fluttering sound.

RE: Boost Controller and the TCV?
 

Thanks for updating the post. Very useful info.
Do you have any pics of the setup?

RE: Boost Controller and the TCV?
 

Now I do,... Here is my stealth type set up.

Boost Controler
http://i14.tinypic.com/85pte1y.jpg

Boost Gauge
http://i11.tinypic.com/71e77h4.jpg

Here is the connector peice I used to bypass the TCV
http://i9.tinypic.com/716tpq9.jpg

and the BOV (which has the annoying whistle on it (its removable). I figured it would be usefull for atleast being able to hear when it opened up. I have yet to hear it whistle because I swear the BOV never goes off.)
http://i4.tinypic.com/6yd339c.jpg

RE: Boost Controller and the TCV?
 

hmmm Now I want to do thatto my volvo :)


thats so cool

RE: Boost Controller and the TCV?
 

If you go into full boost the let off the gas fast you can't hear it?

RE: Boost Controller and the TCV?
 

No, I have tried. Plus I watched the gauge when doing this and all was normal. No signs or sounds from the turbos ether conserning back pressure. The throttle body is electronicly controlled, I was thinking that had something to do with it. Because it prolly' wont slam shut like a normal TB would.

RE: Boost Controller and the TCV?
 

I was driving a TT yesterday after installing new turbo's and I could hear the factory ones by boosting and letting off the gas.

Big you bypass the factory ones?
Are you running both setups?

RE: Boost Controller and the TCV?
 

No CBV if that is what you mean?

RE: Boost Controller and the TCV?
 

Does that mean you bypassed or no?
If you didn't then that may be why you can't hear the valve it might be to quiet because you have 3 things releasing pressure at the same time.

RE: Boost Controller and the TCV?
 

the CBV was replaced by the BOV

RE: Boost Controller and the TCV?
 

Oh ok Im supprised you can't hear it.
I hear the factory setup all the time.
Have you connected a vaccum guage to make sure it is receiving vaccum to open? (Or the other way around)

RE: Boost Controller and the TCV?
 

Yeah, I did it the "proper" way just to replace the stock CBV. The "vacuum" line in all actuality keeps the thing closed unless the throttle body slams shut. Which who knows when it comes to that because it is electronicly controlled. The way it is programmed hurts mid throttle performance. I can tell that (to put simply) it doesnt put the power out unless you put the peddle all the way down... [holding back from ranting[:'(]]

RE: Boost Controller and the TCV?
 

Ok sorry it isn't working the way we think it should.