boxerfan

Acceleration is smooth and the turbo does indeed appear to spool just a tad quicker under heavy shifting.

Are those valves directional? If so... why?

MarkPan

And ****e - i had better order a chip soon!!

boxerfan

Fist off I should say that this is not ideal because of the distance from the throtttle body valve opening at the end of the MM hose.

I used a 1/2" hole saw and bored a hole in the intercooler on the lower side. Looking at the IC you will see a raised bump about the size of a nickel. I used that as my location. After boring the hole I used a grinding stone to gently open the hole to the point where my fitting would self thred in. I used an NPT 1/2" to 3/4" adapter. The 1/2" size side I threaded into the IC.

I then used a spare hose from a decel valve. It is angled quite well to raise the BPV away from the turbo. Since it is probably not good with heat I wrapped it in tin foil as a heat shield. So that's the IC to BPV done.

I ran the BPV trigger line to the IM where the fittings are at the rear. I T'd into one of those lines.

The comes the tricky part. The recirculation feed back to the inlet side of the turbo. The first attempt was to bore a hole into the pipe from the CIS igloo to the turbo inlet and braze a 45 degree copper pipe fitting in there. My brazing sucked and while it did fit I decided to try another approach. Remember that decel valve hose? Well, I used the 90 degree fitting and the rubber bung that connect the hose to the CIS box. I carefully measured and cut a hole in the spare pipe I had and the bung fit very well. The hard part is finding a 1 inch ID hose to connect the BPV to the 90 deg. fitting. I've just cluged together some scraps of pipe to complet the path for the time being.

So... which way does the BPV go? I've seen pics of both orientations. Does it matter? I currently have the IC side connected to the pipe that is opposide the nipple for the control line. The recirculation path is connected to the fitting on the larger chamber that is at 90 degrees to the control fitting. Like I said... the car runs well... does the orientation really make a difference?

Sleeps 4 at 120

You can plumb right back into the waffle boot and forego the whole welding and cutting pipe bit. Just disconnect your decel valve and route the return hose into the boot where the decel went.

Also, the Bosch BPVs are directional. If you put it in backward it'll leak boost at anything over 1 BAR (absolute.)

boxerfan

the control line holds it closed either way.

SteveAngry

<center><img src="http://pictureposter.audiworld.com/4612/cockpitbpv_004.jpg"></center><p>Some valves rely on additional manifold pressure added to the spring pressure to keep them shut.

If you put it in the opposite way then you are only using spring pressure to keep the valve shut.

This would be fine on a valve that has a very stiff spring, etc. BTDT.

Most Bosch BPV work best when mounted the correct way. See picture.

Steve
Michigan

boxerfan

I'll swap it around tomorrow. And see if there is a difference.