4AGE 20v ITB vacuum instructions on Intecracing.com

[jondee86]

Quote:And what about the Blow Off Valve?

Uses the same vacuum source as the other signal lines, so your can
hook it up to one of the tubes on the common vacuum rail.

That rail is connected to each throttle body via the (quite large) ISCV
air inlet ports. So whatever pressure/vacuum is downstream of the
throttle bodies is whatever you will read in the common vacuum rail.

Of course this only applies if you are using the full 20V inlet on a 20V
engine. If you have ITB's on a 16v (as I have) you need to tap each
inlet port for a vacuum signal, and then average the signals in a small
vacuum accumulator.

Cheers... jondee86