I have a 350Z with the turbonetics setup. What I need to know is how many things can be safely run from the vacuum port on the front of the plenum? I am running my boost gauge, boost controller and e-manage all from the same vacuum port. I have heard that that might be too much, and that I should drill the plenum for another port. If this is true, where is the best place for the new port?

thanks

 

i have all my vacuum lines going into a vacuum manifold my friend made out of a block of aluminum. i have a 3/8th input to the manifold and four 1/4 outputs. i plan on adding a second input to equalize the pressure across the manifold. right now i have the Blow-off Valve, UTEC, Boost Gauge, and Fuel Pressure Regulator with one spot to spare coming off the vacuum manifold. My idle inHG is @19-20, which is normal for most.

Before i put the 3/8th line feeding the vacuum manifold, i had a 1/4 line feeding the manifold (no 3/8 fitting/barb at the time) and my inHG was at 16.5 as per my boost gauge and my laptop (UTEC). so i had the same diameter line feeding four identically sized lines coming out. if you have too many things requiring vacuum from the same source i would think that would be a problem.

here are three pics:

 

Another decent place for a vacuum tap, would be to Tee into the vacuum line coming off of the plenum by the firewall, on the neck of the plenum. However, I would say that the e-manage and controller should be independant from each other, not off the same line IMO.
if you take a look at the instructions on Greddy's site in their tech section, you can see that they say to tap the fuel pressure vacuum line.

 

I have a fuel pressure regulator for the AAM Fuel Return System that is tapped into the vacuum line off the back of the plenum. Can I tie the e manage into that line?

 

I live the look of that setup!

where did you drill the plenum for the 3/8 hose?

 

the holes in the manifold were tapped for 1/4 threads fittings. didn't drill into plenum, T-tapped it off the lower front plenum vacuum line.

here is a pic



i have since changed the blue silicone hose to a fuel line hose because the original 3/8th hose (blue) collapsed with the heat. it was a silicone hose but not reinforced. my inHG was almost at 10 because of it. all is well now!

thanks for the comp.

 

Very nice! Good work.