Im just wondering what everyone is doing for the wastegate and blow off signals. I have been reading that you want the wastegate signal before the TB and to never see vaccum? The compressor housing on my turbo doesnt have a refrence point like mentioned.

1. Where to place the wastegate signal? I have a steel pipe right after the compressor going to the intercooler or one right up by the tb that I can attach a fitting to. I had it t-ed off the intake manifold .

2. What size of vaccum line is everyone running? I think my signal line now is 1/4. Tial says 6MM lines whats that convert to in standard hose sizes?

3.The bov needs to see boost and vacuum correct?

Just want to make sure everything looks correct on my setup while the tranny is out.

 

6MM = 0.235" or roughly 1/4".

Wastegate needs to see boost to work. It gets plumbed to the intake tract between the turbo and the throttle body. It will see some vac. during low throttle/cruise, and thats fine. If your Wastegate has two ports on it for hoses, make sure you connect the line to the right one!

BOV needs to see intake manifold vac/press. It goes after the TB to one of the lines on the manifold. When you close the throttle and it creates vac. then the BOV will open. Else you'll get compressor surge.

 

i was told to connect the vacuum source for the wastegates directly to behind the back of the throttle body and not before the t/b to get a true psi reading.

 

Does it say that in the instructions? I'm familiar with a few different ones, but if the instructions say after the TB then I wont argue with them.

If you were to plumb the "boost" hose to after the throttle body, that shouldnt change anything with limiting boost- the only event you will have is closing the throttle plate while in boost, but then the exhaust flow will cut so quickly that boost will fall off anyway.

Putting it closer to the compressor housing (and/or before the intercooler and/or throttle body) will allow it to respond better to leaks in your cold piping (assuming you cant hear them and fix them). After the TB if you cant hear the leak, the turbo may still be able to generate the same PSI if it spins much harder, and you dont want to push it out of its sweet spot.

So I guess it comes down to checking with the manufacturer and seeing what they say. There may be a reason for it, but I cant think of any good ones.

 

I had my wastegate t-d after the tb and im going to switch it to the charge pipe before the intercooler.

 

Wastegate vaccum line can go any where on the boosted side of the turbo. To get a true psi reading it just needs to be after the intercooler. I would just T off a line on the intake manifold.

BOV line needs to go to the intake manifold as well (after the TB). This is how the BOV works (boost on valve) and when the line sees vacuum, pop boost is relieved out of the BOV.

 

This shows the line before the TB, but you can do it after. Its up to you .
http://www.tialmedia.com/documents/w..._wginstall.pdf

BOV line goes after the TB
http://www.tialmedia.com/documents/w...bovinstall.pdf

 

I have mine on the intake manifold now(wastegate) after the tb and it seems to be working ok but I read on another forum that the vaccum is hard on the diaphram.

 

I ran both mine off the intake manifold.

 

i run my wastegate right off the compressor housing.

 

Well I have my wastergate after the tb. Should I change it or just run with it.

 

Its up to you. I cant count how many boosted threads I have read on ls1tech and turbomustangs.com where people have the reference to the intake manifold... its alot though. If it makes you feel better, move it ahead of the TB.

 

well i was only told jon that if you refernece it in the tubing before t/b you will see better psi since it needs to fill the coldside before filling the intake manifold plus when the throttle blades close is this true or will it see the same before or after i know on my old turbo regal it was referenced to the comp inlet housing...

but i will be trying it out directly to the intake maniofld jon as we spoke before and see what thediffernce is after all its just connecting and reconnecting a vacuum line not nothing crazy.