MeanGreenSwedeMachine Posted August 15, 2007 Report Share Posted August 15, 2007 So someone gave me a tip with my low boost problem today. Said it seemed like my BCS was running wide open. I took a look at it, and found what hopefully is the problem. The bottom hole goes to the wastegate like it should. The top hole goes somewhere toward the turbo, which I'm assuming is right. The middle hole has about 3 inches of tubing and is then capped off with a screw. Where is this supposed to go? And could this cause low boost? (about 3psi) Thanks. Link to comment Share on other sites More sharing options...
Hellas850 T-5 Posted August 15, 2007 Report Share Posted August 15, 2007 The middle hose goes to the turbo inlet right after the MAF sensor,to the bottom side of the plastic inlet hose.I'm not so sure but it could be the problem because it works like the Mbc valve where the one hose stays free in order to leave the pressure from the turbo go out and not in the wastegate so it rises the turbo pressure. Link to comment Share on other sites More sharing options...
PsychoBeano Posted August 15, 2007 Report Share Posted August 15, 2007 Yeah, feel around the plastic piping coming from an airbox, there should be a nipple around there. Then just plug the hose thats capped off into there. Link to comment Share on other sites More sharing options...
RAzOR Posted August 15, 2007 Report Share Posted August 15, 2007 Disconnect the wastegate actuator and check you boost (carefully). I think the top (yellow) connection on the BCS goes to the Wastegate.There are also two connections at the bottom the turbo. I do not recall what goes where but one of them is the BCS. I imagine one could get them swapped. Link to comment Share on other sites More sharing options...
Hellas850 T-5 Posted August 15, 2007 Report Share Posted August 15, 2007 Disconnect the wastegate actuator and check you boost (carefully). I think the top (yellow) connection on the BCS goes to the Wastegate.There are also two connections at the bottom the turbo. I do not recall what goes where but one of them is the BCS. I imagine one could get them swapped.Two connections on the bottom of the turbo? Link to comment Share on other sites More sharing options...
JHEIII874T5M Posted August 15, 2007 Report Share Posted August 15, 2007 Two connections on the bottom of the turbo?Well, you could say the one going to the BCS and then the other one for the CBV (compressor bypass valve).Either way, to the original poster, that middle port on the BCS should lead to your intake (air inlet pipe) it will have a nipple on it, just plug the vacuum line on there. Link to comment Share on other sites More sharing options...
MeanGreenSwedeMachine Posted August 15, 2007 Author Report Share Posted August 15, 2007 Awesome, thanks guys.I've got the bettery disconnected now to let everything reset so that I can go give her a hard run and hopefully everything will be fixed now. Link to comment Share on other sites More sharing options...
Account_Deleted_T5M Posted August 16, 2007 Report Share Posted August 16, 2007 Screw the bcs, run an mbc Link to comment Share on other sites More sharing options...
Denovae Posted August 16, 2007 Report Share Posted August 16, 2007 Well, you could say the one going to the BCS and then the other one for the CBV (compressor bypass valve).Either way, to the original poster, that middle port on the BCS should lead to your intake (air inlet pipe) it will have a nipple on it, just plug the vacuum line on there.wouldn't the CBV be running off the TB or manifold in order to allow it operate properly? if it's off the turbo it'll have the same psi on both sides of the diaphragm so it would stay closed when you let off the throttle... correct me if i'm wrong. Link to comment Share on other sites More sharing options...
PsychoBeano Posted August 16, 2007 Report Share Posted August 16, 2007 I think he meant that you could say two plugs come off the turbo because one of them goes from the turbo to the bcs and the other one from the cbv to the intake mani/vac tree but yet they are both coming from about the same area. Link to comment Share on other sites More sharing options...
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