Engine bogging down with any swift throttle change

[RETed]

Originally Posted by JustJeff

Whats your opinion of using the same nipple that's under the BAC for Pressure Sensor, BOV, and aftermarket boost gauge?

#1 priority is the BOV valve.
Always use a dedicated vacuum line for the BOV.
Do NOT "T" this line, if possible.
If the BOV doesn't get a strong enough vacuum to trigger, it fails to open efficiently.
If the BOV doesn't open properly, it'll kill the turbo due to compressor surge.
I tend to use the fitting under the BAC valve for the BOV, since we're only concerned with vacuum.
The BOV opens due to a vacuum signal - i.e. when you lift off the throttle under high RPM's.
Pulsations under other conditions doesn't mean anything to the BOV; it stays closed under anything close to "0" or positive boost pressure.
This fitting also is usually the closest to the BOV in most installs (and with the stock unit), so having a short vacuum hose helps here.

Everything else doesn't really matter.
Unless you're worried about being off a few psi, they are not important.
Stock ECU retards ignition timing under positive boost - it does not affect fuel delivery.
The stock ECU ignition maps are very conservative, does being off a few degrees won't hurt anything.
Most aftermarket boost gauges aren't accurate enough for you to worry about being off a few degrees; even if the gauge is off, it's just a display.

Killing your turbo is a different matter...


-Ted