No VAC at idle

[jrd450r]

My rb25->s13 swap has gone pretty well, its up and running and driveable, only issue thats bothering me now is when at idle im not reading any VAC on my boost gauge. If i hit the gas at all its drops down to an appropiate level and seems fine, when boosting its holding around 12psi running the wastegate line off of the intake manifold. Im wondering why no VAC at idle though? Any suggestions?

[nissans13240sx]

vac gauge should read about 20 at idle. If it idles fine but gauge reads zero, my guess is your gauge is not hooked up correctly.

[jrd450r]

It idles perfect, thats why I'm kinda flustered. I have it hooked up to where the charcoal canister lines should be.

[nissans13240sx]

I dont know about the 25 but I have my gauge hooked up on the back of my intake manifold on my 20.

[Shocker]

try hooking it up to where the stock boost gauge for the r33 should be(intake Plenum by firewall), thats where I had mine when I did my swap, your most likely getting a pour VAC signal.