Resolved Why remove a BCS restrictor?

[coloradotuner]

Why would you want to remove the restrictor from the bcs? The reason i ask is because this is in The free mods page but is not explained why it is helpful. They put it in there for a reson right? Anyone heard of cars having problems after this was removed. ?

I know that it will incrase the boost a couple psi I would just like to know why this mod is done.

 

[athlete3344]

Most people leave it plugged in and cap it, and use a MBC to control boost.

http://www.dsmtuners.com/forums/newbie-forum/354740-bcs-restrictor-removal-vs-mbc.html

 

[iBoostDSM]

If you're not ready for a mbc yet there is a little rubber piece in the bcs that can be taken out to raise the boost 1-2psi.

 

[eclipsyco]

Just to add a couple psi more that it. I did it and many others no problems at all you basically go from the stock 9-10psi to 11-12 psi . That if your on the stock turbo. I personally completely remove it after a while and bought a MBC.

 

[wparks]

The BCS is there to limit boost if the ECU senses detonation via the detonation sensor because the fuel has too low of an octane rating, etc. If there is detonation (or the det sensor is bad) the ECU removes power from this relay, closing it, feeding the full boost pressure to the waste gate control dashpot on the turbo, which starts to open in the 8-10 psi range and limits the boost to that level.

When the ECU does not detect detonation under boost, it applies power to this solenoid, opening it, causing some of the boost pressure in the line to bleed out through the restriction (and back into the intake), so that a pressure lower than the actual boost to appears at the wastegate control dashpot, causing it to activate at a higher actual boost pressure. The restriction is engineered to control how much extra boost is allowed- removing this restriction increases somewhat the boost.

The manual boost controller is definitely advantageous, by not only allowing higher boost to be selected but also in preventing the waste gate control dashpot from starting to open and leak before you reach the desired boost threshold.

 

[undefined0000]

Its usually one of the first mods I do to my friend's cars, just bypass it and run wastegate pressure. While running a boost controller, you can adjust boost to whatever you want that's safe. For safety, its always good to get a Wideband sensor and gauge, but stock, 15psi is safe enough.

Don't get the Ebay MBC if you decide to go that route. There are 3 settings, I've noticed this on 2 cars.

Wastegate pressure
Medium
Holy crap batman (which is usually too much for fuel to keep up)

 

[coloradotuner]

The BCS is there to limit boost if the ECU senses detonation via the detonation sensor because the fuel has too low of an octane rating, etc. If there is detonation (or the det sensor is bad) the ECU removes power from this relay, closing it, feeding the full boost pressure to the waste gate control dashpot on the turbo, which starts to open in the 8-10 psi range and limits the boost to that level.

When the ECU does not detect detonation under boost, it applies power to this solenoid, opening it, causing some of the boost pressure in the line to bleed out through the restriction (and back into the intake), so that a pressure lower than the actual boost to appears at the wastegate control dashpot, causing it to activate at a higher actual boost pressure. The restriction is engineered to control how much extra boost is allowed- removing this restriction increases somewhat the boost.

The manual boost controller is definitely advantageous, by not only allowing higher boost to be selected but also in preventing the waste gate control dashpot from starting to open and leak before you reach the desired boost threshold.

Thanks this is what I was looking for. So when you remove the bcs and replace it with a mbc you could possibly get more detonation

 

[undefined0000]

Thanks this is what I was looking for. So when you remove the bcs and replace it with a mbc you could possibly get more detonation

Yes. The higher the boost, the more likely knock is, when its detected, timing gets pulled though, its about all the computer can really do to try and save the motor.