TCV Installation

**PierreC** · 09-30-2010, 12:23 PM

I just took delivery of an IPD TCV ... with the 7' silicone hose. I believe the "bottom" hose is the difficult one to replace. Is anyone who has done it willing to share some "how to" and "watch out for" experiences please? A photo or two, maybe?

Thanks!

**howardc64** · 09-30-2010, 12:45 PM

Originally Posted by PierreC

I just took delivery of an IPD TCV ... with the 7' silicone hose. I believe the "bottom" hose is the difficult one to replace. Is anyone who has done it willing to share some "how to" and "watch out for" experiences please? A photo or two, maybe?

Thanks!

You will get performance just by replacing the top 2 hoses. Worked for both my 01 T5 and 01 V70XC.

Strangely enough, just replacing TCV without the 2 top hoses yields no performance gain.

**sjonnie** · 09-30-2010, 02:32 PM

Originally Posted by PierreC

I just took delivery of an IPD TCV ... with the 7' silicone hose. I believe the "bottom" hose is the difficult one to replace. Is anyone who has done it willing to share some "how to" and "watch out for" experiences please? A photo or two, maybe?

Thanks!

It's actually not all that difficult, I probably swore only 4 times, a lot less than that time I took the B4 servo cover off! Just remove the upper engine mount to gain better access to the turbo. I found it was easier to remove the clip for the lower hose from underneath the car, just grab it with the pliers and slide it up. Then you can pull the hose off from above. Replacing the hose can be done entirely from above.

**PierreC** · 10-02-2010, 12:49 AM

OK - so the "yellow" hose is easy ... but it seems that I will have to remove the air duct pipe between the air cleaner housing end the turbo to reach the bottom of the "blue" hose ...

Is this the only way or is there another way? Or a special tool that can reach in the narrow space?

**jda2000** · 10-02-2010, 05:19 PM

the top two hoses, the green and blue can be replaced from the top without removing the intake pipe to the turbo.

Put the car on ramps and is easier that way.

The red(bottom) one is easier to get to it if you remove the clamp/hose from below, then attach new hose from above and place clamp over connection from below.

**PierreC** · 10-23-2010, 07:31 AM

I finally installed the IPD TCV ... including all three hoses!

Immediate difference is an almost total elimination of turbo lag, which had become very noticeable and frustrating lately. Power delivery is also faster and smoother ...

Well worth the $$ and EFFORT!

Pierre

**Ocean Racer** · 10-23-2010, 07:43 AM

Im yet to connect the third one (bottom hose) and am already satisfied. Pierre, did you notice any difference by doing the third?

**PierreC** · 10-23-2010, 08:51 AM

@ OceanRacer: Don't know as I did it all simultaneously ...

Pierre

**Huzer21** · 10-23-2010, 09:18 AM

I've done 2, and will be doing the third next week when I finally get around to a few other things. I'm not expecting a significant difference but will report back regardless.

**Pennhaven** · 10-23-2010, 09:50 AM

I've only done the top two on mine. Results are favorable as described by others. On the other hand, with the factory hoses I could detect hardly any difference with the heavy duty TCV.

The explanation for only needing to change two of the three is, I think, that the bottom hose is pressurized by the turbo. It's purpose would be to provide the boost level feedback signal to the valve.

The other two are vacuum lines (supply to the valve, control feed to the waste gate).

Being constantly pressurized the signal hose would not be subject to collapse.

But, if the hose walls aren't stiff enough, the two vacuum lines will collapse somewhat as the vacuum increases. As others have already explained, the collapsing hose would cause a lag/decrease in the control signal to the waste gate. So stiffer hose for those two lines results in better control signal with less lag.