I've heard people mention "diconnecting the boost bypass" what exactly does this do? Does it help a lot? And, how do i do it?

thanks

 

You just unplug the boost bypass valve and it helps mostly if you are racing at the dragstrip and/or running extra boost. I don't have a picture on hand, but it's a little plug behind your intake near the firewall.

 

If anyone has any picture of where this plug is that would be great.

 

Just took these a minute ago for you, so, sorry for the poor quality, it's cold in my garage!





If these don't help, look for the solenoid with a pink(?) sticker around the wires that say SCB

 

Here it is........The plug with the red tab on it is the disconnected "male" end.

--Joe

 

It keeps it from dumping boost when you go past redline or the tranny gets too hot.

 

When you disconnect the boost bypass silinoid, it keeps the PCM from opening the vaccume controlled waist gate and dumping the boost when it falls into fail-safe.

 

Can someone tell my why this is a good thing to disconnect the plug or install a bypass kit? Don't you run the risk of damaging the blower/motor by doing this?

Bob

 

The waist gate is controlled by vacume. When you go to WOT (Wide Open Throttle), there is no vacume on the waist gate makeing it close and you get full boost. But when the PCM sees something it doesn't like (hitting the rev limiter, excessive transmission heat, or what ever), it will trip the silinoid causeing vacume to go on the waist gate which in turn will open and dump the boost. When you disconnect the silinoid, the PCM can not trip it due to the open circuit. When you use JDM's $25 kit with three little plastic elbows in it, it takes the silinoid out of the vacume system. By doing this, the PCM can trip the silinoid, but it wont do anything.

 

I prefer to unplug mine at the track and keep it on when normal driving....well normal to us.

 

Thank you Lightning Boy. I've asked this question on a couple other boards and could never get a good explanation of it's operation.

Bob

 

ok, but referring to the question of potential damage. Is there a chance going down the track at WOT that not having boost dump will cause damage? Worst case scenario?

 

You could just have your chip set to shift at about 5200 if you don't want to worry about it. It probably wouldn't help your E.T's much though.