New or little known free BCS mod

[MNGSX]

I was looking at autspeeds DIY boost control articles.

Bottom has all three links
http://www.autospeed.com.au/A_0685/cms/article.html

I looked at all the different systems.

I came up with someting to do with the BCS restricor after you remove it from the solinoid.

Stick it inside the end of the T fiting that attaches to the line from the compressor port.

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That is like our factory system with the exception of the restrictor between the turbo and the T. Also we have a solenoid between the bleed outlet and the counted side of the MAF.

Just mentally draw that in there.

From

http://www.autospeed.com.au/cms/article.html?&A=0096

This diagram shows a typical wastegate bleed. A T-piece is inserted in the wastegate hose and air is bled out. One of the problems with taking this approach is that often a lot of air needs to be bled from the line before the wastegate actually sees a lower pressure. That's because there is an awful lot of air available from the turbo - bleeding off just a bit often makes little difference to the pressure seen by the wastegate actuator.

The way to overcome this problem is to insert a restriction before the bleed, as has been done here. This way, the bleed needs to flow only a small amount of air to make a large difference to the pressure seen by the wastegate diaphragm. Introducing the restriction is fundamental to the way in which this system works. The insertion of the restrictor also adds a measure of wastegate delay - the wastegate doesn't start to open until all the hosing the other side of the restriction is filled with pressurised air.

By moving the restrictor from the BCS to the T inlet from the turbo does two things.

Eliminates the restriction at the BCS which allows air to bleed out faster.. Less pressure on the wastgate actuator.

It also creates a restriction at the pressure inlet to the system. Not only can pressure get out easier but there is less air trying to get in there.

This will allow the wastgate to close faster on shifts and raise the boost pressure

 

[Tallen]

Problem being that most people totally destroy that little thing when removing it. I know I did.

Cool idea thou!

 

[nineD5_GS-T]

That is called the BCS mod. Its a free mod that raises boost 1-2 psi.

Your just supposed to use a screw inside the nipple and turn, locking the nipple, then pull out. Very easy mod.

 

[Enigma_Man]

He's talking about a different one guy, didn't you read it?

Originally posted by nineD5_GS-T
That is called the BCS mod. Its a free mod that raises boost 1-2 psi.

Your just supposed to use a screw inside the nipple and turn, locking the nipple, then pull out. Very easy mod.

 

[hostile]

300zx's uses these restrictors, they are called boost jets. Basically it is a small metal restrictor placed on the pressure line feeding the wastgate.

It alters the signal so you get more boost.

A ball and spring controller will give you faster boost though.

 

[MNGSX]

On a vented setup like ours putting it on the turbo side of the tee fitting gets faster boost.

Since the lines on the other side need to fill with air before the WG will move. So by putting it here it restricts air flow into the wastegate actuator a bit. It also does not restrict outward air flow. The gate will open slower later at a higher pressure since the air into the system is restricted.

I'll have to check my guage with this mod. I have'nt driven on it yet.

I was just looking at this stuff on the net and my BCS restrictor was in a little plastic box in my tool chest. I looked to see if the restrictor fit... Yep it snapped right in there. I'm not sure how many PSI this gets yet but I know the wastegate will open later.