Vacuum lines, BOV, Wastegate, and MBC - Does this look right? 1gin2g

[TSG59_Steve]

Finishing up the swap this weekend and I want to make sure I've got it all right. I've got a tial 38mm wastegate (the nipple in the diagram is the lower one) and a turbosmart single stage mbc.

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If there is anything wrong please let me know.

Thanks,
Steve

 

[RedTurboEclipse]

People are still T-ing mbc/ebc connections to the bov line?

 

[super95awd]

Well in that setup the boost controller won't work, but I'm assuming you just slipped up.

Hell, I still run mine tee'd off my BOV line.

 

[2GeNTSi]

^ Yeah how is the mbc going to function, it's only receiving the vacuum source but no outlet to the wg. Also have you tried going with a source after the compressor but before the ic?

 

[TSG59_Steve]

Well the reason I'm teeing it off right there is because my j-pipe has no nipple on it. And the turbo smart controller has a weird looking box thing on it that has an arrow that says point towards the wastegate. I'll have to take a picture later and post it. So you're saying as of right now everything looks good except the boost controller... hmmm... I really don't know how else I can hook it up. At least without welding a nipple onto the j-pipe but I can't weld.

 

[TSG59_Steve]

Like this:

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[CanadianTSi]

The nipple on the front(side) of the valve cover is not a boost source.

Gonna have to move that BOV line to a TB port...

 

[PsiRemix]

I had always T-ed my MBC in with my BOV until quite recently. I think it was all those old threads with posts from Oldman and etc that finally convinced me to hook it up another way.

The way I have it now is: intake to BOV (one line), tapped boost source(1/8 fitting off my Jpipe right after compressor outlet) to MBC inlet, MBC outlet to WG.

I admit it as well, the BOV seems to function a little better, especially at low boost. I can also properly set my Tial for higher boost levels despite the spring rate.
I dont know if this helped at all, but if you need a diagram or a pic, I'll post one up when im not in such a rush.

Thanks to Oldman and RedTurboEclipse for finally convincing me btw

 

[MrBoxx]

You don't need to weld a nipple onto your J-pipe: You can just drill a hole in either the pipe or the compressor housing outlet, tap the hole, and screw in an NPT nipple.

Also, that Turbosmart MBC isn't exactly a reliable MBC for our cars, since that gate-tee has to go in between a vacuum line. You'd be better off using a simple Hallman, JoeP, or TurboXS style MBC with a simple inlet and outlet, and attaching a pressure source directly from the IC pipe/compressor to the inlet side, and a vacuum line from the outlet side to the wastegate actuator.

 

[TSG59_Steve]

The nipple on the front(side) of the valve cover is not a boost source.

Gonna have to move that BOV line to a TB port...

That's the intake manifold, not the valve cover. Picture wasn't really clear, sorry.

 

[TSG59_Steve]

You don't need to weld a nipple onto your J-pipe: You can just drill a hole in either the pipe or the compressor housing outlet, tap the hole, and screw in an NPT nipple.

Also, that Turbosmart MBC isn't exactly a reliable MBC for our cars, since that gate-tee has to go in between a vacuum line. You'd be better off using a simple Hallman, JoeP, or TurboXS style MBC with a simple inlet and outlet, and attaching a pressure source directly from the IC pipe/compressor to the inlet side, and a vacuum line from the outlet side to the wastegate actuator.

I didn't even think about just drilling and tapping. I have an extra NPT nipple too. I feel dumb now.

I don't really understand how the turbosmart isn't going to be a realible mbc though, can you please explain it to me? If that's the case obviously I would like to switch it out, but I would want to really know why first.

 

[MrBoxx]

I don't really understand how the turbosmart isn't going to be a realible mbc though, can you please explain it to me? If that's the case obviously I would like to switch it out, but I would want to really know why first.

Because of the way the Turbosmart has to be installed, that is to say, that the directional tee needs to go between a pressure line, there's really no good reliable way that I know of to install it on our cars without tapping something like the BOV line.